Electric power converting device, and rotating electric machine unit

Abstract

An inverter device (30) includes a first inverter module (100), a second inverter module (110), and a switching module (90). The first inverter module (100) includes a first inverter circuit. The first inverter circuit is connected to one end of a motor coil. The second inverter module (110) includes a second inverter circuit. The second inverter circuit is connected to the other end of the motor coil. The switching module (90) includes a switching circuit. The switching circuit connects the first inverter circuit and the second inverter circuit without passing through the motor coil. The first inverter module (100), the second inverter module (110), and the switching module (90) are accommodated in an inverter housing (70).

Description

Power conversion device and rotating electrical unit CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Patent Application No. 2023-221093 filed in Japan on December 27, 2023, and the contents of the original application are incorporated by reference in their entirety.

[0002] The disclosure in this specification relates to a power conversion device and a rotating electric machine unit.

[0003] Patent Document 1 describes a motor drive device for driving a motor. This motor drive device has a first inverter and a second inverter. The first inverter and the second inverter are formed to include a plurality of switch elements. The first inverter and the second inverter are mounted on a single circuit board.

[0004] Patent No. 7367227

[0005] However, in the above-mentioned Patent Document 1, the first inverter and the second inverter are mounted on a single circuit board, which tends to reduce the degree of freedom regarding the relative positional relationship between the first inverter and the second inverter. This increases the need to use a dedicated housing that is tailored to the specifications of the first inverter, the second inverter, and the board. Therefore, there is a concern that the versatility of the housing that houses the first inverter and the second inverter will be reduced.

[0006] An object of the present disclosure is to provide a power conversion device and a rotating electrical machine unit that can increase the versatility of the housing.

[0007] The multiple aspects disclosed in this specification employ different technical means to achieve their respective objectives. Furthermore, the reference symbols in parentheses in the claims and this section are merely examples showing the correspondence between specific means described in the embodiments below as one aspect, and do not limit the technical scope.

[0008] In order to achieve the above object, the disclosed aspect is a power conversion device that converts power supplied to a rotating electric machine, comprising: a first inverter component formed including a plurality of first switches, having a first inverter connected to a winding of the rotating electric machine, and converting power supplied to the winding by the first inverter; a second inverter component formed including a plurality of second switches, having a second inverter connected to the winding, being a component independent of the first inverter component, and converting power supplied to the winding by the second inverter; a switching path that can switch the current flow state of the winding, and connects the first inverter and the second inverter so that current can flow between them without passing through the winding; a switching component that has a changeover switch provided in the switching path, is a component independent of the first inverter component and the second inverter component, and is capable of cutting off current to the switching path by the changeover switch; and a housing that accommodates the first inverter component, the second inverter component, and the switching component.

[0009] In the above-described power conversion device, the first inverter component, the second inverter component, and the switching component are each housed in a housing as independent components. This configuration increases the degree of freedom regarding the relative positional relationship between the first inverter component, the second inverter component, and the switching component within the housing. This reduces the need to use dedicated housings tailored to the specifications of the first inverter component, the second inverter component, and the switching component. This increases the versatility of the housing in the power conversion device.

[0010] The disclosed aspect is a rotating electric machine unit comprising: a rotating electric machine driven by a supply of electric power; and a power conversion device that converts the electric power supplied to the rotating electric machine; a first inverter component formed including a plurality of first switches, having a first inverter connected to a winding of the rotating electric machine, and converting the electric power supplied to the winding by the first inverter; a second inverter component formed including a plurality of second switches, having a second inverter connected to the winding, being a component independent of the first inverter component, and converting the electric power supplied to the winding by the second inverter; a switching path that can switch the current flow state of the winding, and connects the first inverter and the second inverter so that current can flow between them without passing through the winding; a switching component that has a changeover switch provided in the switching path, is a component independent of the first inverter component and the second inverter component, and is capable of interrupting current flow to the switching path by the changeover switch; and a housing that accommodates the first inverter component, the second inverter component, and the switching component.

[0011] According to the rotating electrical machine unit, the versatility of the housing can be improved, similarly to the power conversion device.

[0012] 1 is a diagram showing a circuit of a drive system in a first embodiment. A front view of a motor unit. A cross-sectional view taken along line III-III in FIG. 2, showing a cross-sectional view of a first housing portion. A cross-sectional view taken along line IV-IV in FIG. 2, showing a cross-sectional view of a second housing portion. A cross-sectional view taken along line V-V in FIG. 4, showing a longitudinal cross-sectional view of an inverter housing. A cross-sectional view of a first housing portion in a second embodiment. A cross-sectional view of a second housing portion. A longitudinal cross-sectional view of an inverter housing. A cross-sectional view of a first housing portion in a third embodiment. A cross-sectional view of a second housing portion. A longitudinal cross-sectional view of an inverter housing. A cross-sectional view of a first housing portion in a fourth embodiment. A cross-sectional view of a second housing portion. A longitudinal cross-sectional view of an inverter housing. A cross-sectional view of a first housing portion in a fifth embodiment. A cross-sectional view of a first housing portion in a sixth embodiment. A diagram showing a circuit of a drive system in a seventh embodiment. A cross-sectional view of a first housing portion. A diagram showing a circuit of a drive system in an eighth embodiment.

[0013] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in the preceding embodiment will be assigned the same reference numerals, and duplicate descriptions may be omitted. In each embodiment, when only a part of the configuration is described, other previously described embodiments may be applied to the other parts of the configuration. In addition to combinations of parts that are specifically specified as being combinable in each embodiment, it is also possible to partially combine embodiments even if not specified, as long as there is no particular problem with the combination.

[0014] First Embodiment A drive system 10 shown in Fig. 1 is mounted on a moving body such as a vehicle or an aircraft. The drive system 10 is a system that drives the moving body to move. For example, the drive system 10 rotates a rotating body to move the moving body. Examples of the rotating body include a wheel of a vehicle and a propeller of an aircraft.

[0015] The drive system 10 has a battery 11, a power line 12, and a motor unit 15. The battery 11 is a power supply unit that supplies power to the motor unit 15. The battery 11 is a DC power source that supplies DC power to the motor unit 15. The battery 11 is sometimes referred to as a power supply unit. The battery 11 has a rechargeable secondary battery. Examples of secondary batteries include lithium ion batteries and nickel-metal hydride batteries. The battery 11 is a power storage device that can store power. The battery 11 has a positive electrode and a negative electrode. In the battery 11, the potential of the positive electrode is higher than the potential of the negative electrode. The positive electrode is the electrode on the high potential side. The negative electrode is the electrode on the low potential side. Note that a fuel cell, a generator, or the like may also be used as the power supply unit.

[0016] The motor unit 15 is a device that drives the moving body to move. The motor unit 15 corresponds to a rotating electric machine unit. The motor unit 15 has a motor 20 and an inverter device 30. The power line 12 electrically connects the battery 11 and the motor 20 via the inverter device 30. The power line 12 supplies power from the battery 11 to the motor 20 via the inverter device 30. The inverter device 30 converts the power supplied to the motor 20. The inverter device 30 corresponds to a power conversion device.

[0017] The motor 20 is a multi-phase AC motor. For example, the motor 20 is a three-phase AC motor having a U phase, a V phase, and a W phase. The motor 20 is a drive source that drives the moving body to move, and functions as an electric motor. For example, the motor 20 is a brushless motor. The motor 20 is a motor generator. The motor 20 can function as a generator. The motor 20 corresponds to a rotating electric machine.

[0018] The motor 20 has a motor coil 22. The motor coil 22 is a multi-phase coil. The motor coil 22 corresponds to a winding. For example, the motor coil 22 is a three-phase coil, and is provided for each of the U phase, V phase, and W phase. The motor 20 is an open-winding motor. The multi-phase motor coils 22 are provided in the motor 20 independent of each other. The motor coil 22 has a first coil end 22a and a second coil end 22b. Of the pair of ends that the motor coil 22 has, one is the first coil end 22a and the other is the second coil end 22b.

[0019] The inverter device 30 has a first inverter circuit 40 and a second inverter circuit 50. The inverter circuits 40, 50 are power conversion circuits that convert power. The first inverter circuit 40 corresponds to the first inverter, and the second inverter circuit 50 corresponds to the second inverter. For example, the inverter circuits 40, 50 are three-phase inverters that perform power conversion for each of the U phase, V phase, and W phase. For example, the inverter circuits 40, 50 are DC-AD conversion circuits that convert DC power to AC power.

[0020] The first inverter circuit 40 is connected to the first coil end 22 a. The first inverter circuit 40 corresponds to a first inverter. The second inverter circuit 50 is connected to the second coil end 22 b. The second inverter circuit 50 corresponds to a second inverter.

[0021] The drive system 10 is provided with a plurality of power lines 12. The plurality of power lines 12 include a P line 12p, an N line 12n, and an output line 12o. The P line 12p, the N line 12n, and the output line 12o are current-carrying paths. The P line 12p and the N line 12n electrically connect the battery 11 and the inverter circuits 40, 50. The P line 12p and the N line 12n are power supply paths and supply power from the battery 11 to the inverter circuits 40, 50. The P line 12p is connected to the positive electrode of the battery 11. The P line 12p is a high-potential power supply line. The N line 12n is connected to the negative electrode of the battery 11. The N line 12n is a low-potential power supply line. A lower voltage is applied to the N line 12n than to the P line 12p.

[0022] The P line 12p electrically connects the first inverter circuit 40 and the second inverter circuit 50 without passing through the motor coil 22. The P line 12p has a first P line 12pa, a second P line 12pb, and a switching P line 12pc. The first P line 12pa is included in the first inverter circuit 40. The second P line 12pb is included in the second inverter circuit 50. The switching P line 12pc connects the first P line 12pa and the second P line 12pb without passing through the motor coil 22. The switching P line 12pc electrically connects the first inverter circuit 40 and the second inverter circuit 50 without passing through the motor coil 22. The switching P line 12pc corresponds to a switching path and an upper switching path.

[0023] The N line 12n electrically connects the first inverter circuit 40 and the second inverter circuit 50 without passing through the motor coil 22. The N line 12n has a first N line 12na, a second N line 12nb, and a switching N line 12nc. The first N line 12na is included in the first inverter circuit 40. The second N line 12nb is included in the second inverter circuit 50. The switching N line 12nc connects the first N line 12na and the second N line 12nb without passing through the motor coil 22.

[0024] The output line 12o electrically connects the inverter circuits 40, 50 and the motor 20. The output line 12o is a current path for multiple phases. An output line 12o is provided for each of the multiple phases. The output line 12o connects the inverter circuits 40, 50 and the motor coil 22 for each of the multiple phases. The output line 12o is connected to upper and lower arm circuits 41, 51 (described later) for each of the multiple phases.

[0025] The output line 12o connects the first inverter circuit 40 and the second inverter circuit 50 via the motor 20. The output line 12o has a first output line 12oa and a second output line 12ob. The first output line 12oa electrically connects the first inverter circuit 40 and the motor coil 22. The first output line 12oa is connected to the first coil end 22a. The first output line 12oa has a portion included in the first inverter circuit 40 and a portion included in the motor 20. The first output line 12oa corresponds to a first winding path.

[0026] The second output line 12ob electrically connects the second inverter circuit 50 and the motor coil 22. The second output line 12ob is connected to the second coil end 22b. The second output line 12ob has a portion included in the second inverter circuit 50 and a portion included in the motor 20. The second output line 12ob corresponds to a second winding path.

[0027] The first inverter circuit 40 has a first upper and lower arm circuit 41. The second inverter circuit 50 has a second upper and lower arm circuit 51. The upper and lower arm circuits 41, 51 are provided for each of the multiple phases. For example, the upper and lower arm circuits 41, 51 are provided for each of the U phase, V phase, and W phase. The upper and lower arm circuits 41, 51 are sometimes referred to as legs or arm circuits. The upper and lower arm circuits 41, 51 are connected to the P line 12p, the N line 12n, and the output line 12o, respectively.

[0028] The first upper and lower arm circuit 41 has a first upper arm switch 42 and a first lower arm switch 43. The first upper arm switch 42 and the first lower arm switch 43 are connected in series with each other. The first upper arm switch 42 is connected to the first P line 12pa and the first output line 12oa. The first lower arm switch 43 is connected to the first N line 12na and the first output line 12oa. The first upper arm switch 42 and the first lower arm switch 43 correspond to the first switch. Furthermore, the first upper arm switch 42 corresponds to the first upper switch, and the first lower arm switch 43 corresponds to the first lower switch.

[0029] The second upper and lower arm circuit 51 has a second upper arm switch 52 and a second lower arm switch 53. The second upper arm switch 52 and the second lower arm switch 53 are connected in series with each other. The second upper arm switch 52 is connected to the second P line 12pb and the second output line 12ob. The second lower arm switch 53 is connected to the second N line 12nb and the second output line 12ob. The second upper arm switch 52 and the second lower arm switch 53 correspond to second switches.

[0030] The arm switches 42, 43, 52, and 53 are formed of switching elements. The switching elements are semiconductor elements such as semiconductor switches. The switching elements are switches that do not have mechanical contacts. The switching elements are transistors such as MOSFETs and IGBTs. MOSFET is an abbreviation for Metal-Oxide-Semiconductor Field-Effect Transistor. IGBT is an abbreviation for Insulated Gate Bipolar Transistor. In the inverter circuits 40 and 50, power conversion is performed by switching the arm switches 42, 43, 52, and 53. The arm switches 42, 43, 52, and 53 can be switched between a conducting state in which current flows and a blocking state in which current is blocked.

[0031] The upper and lower arm circuits 41 and 51 include arm diodes 42a, 43a, 52a, and 53a. The arm diodes 42a, 43a, 52a, and 53a are reflux diodes. The arm diodes 42a, 43a, 52a, and 53a are connected in anti-parallel to the arm switches 42, 43, 52, and 53. The arm diodes 42a, 43a, 52a, and 53a may be parasitic diodes of the arm switches 42, 43, 52, and 53, or may be diodes provided separately from the parasitic diodes.

[0032] The inverter device 30 includes a switching circuit 60. The switching circuit 60 is a circuit capable of switching the energization state of the motor coil 22. The switching circuit 60 can switch the energization state of the output line 12o by switching the energization state of at least one of the P line 12p and the N line 12n. For example, the switching circuit 60 can switch the energization state of the P line 12p.

[0033] The switching circuit 60 has a P switch 61. The P switch 61 is provided in the switching P line 12pc. The P switch 61 is provided between the first inverter circuit 40 and the second inverter circuit 50. The P switch 61 can cut off the current flow through the switching P line 12pc. The P switch 61 corresponds to a changeover switch.

[0034] The P switch 61 is formed of a switching element, similar to the arm switches 42, 43, 52, and 53. The P switch 61 can be switched between a conducting state in which current flows and a blocking state in which current is blocked. The P switch 61 is sometimes referred to as a switch. The P switch 61 may be formed of a mechanical switch. A mechanical switch is a switch having mechanical contacts.

[0035] The inverter device 30 has a first smoothing capacitor 31 and a second smoothing capacitor 32. The smoothing capacitors 31 and 32 are capable of smoothing the DC voltage supplied from the battery 11. The smoothing capacitors 31 and 32 are formed of capacitor elements such as film capacitors. The smoothing capacitors 31 and 32 are connected to the P line 12p and the N line 12n.

[0036] The first smoothing capacitor 31 is connected in parallel to the first inverter circuit 40. For example, the first smoothing capacitor 31 is connected to the first P line 12pa and the first N line 12na between the battery 11 and the first inverter circuit 40. The second smoothing capacitor 32 is connected in parallel to the second inverter circuit 50. For example, the second smoothing capacitor 32 is connected to the second P line 12pb and the second N line 12nb on the opposite side of the second inverter circuit 50 from the battery 11.

[0037] The inverter device 30 has a filter circuit 33. The filter circuit 33 is a circuit for reducing noise such as electromagnetic noise. An example of the filter circuit 33 is an EMI filter. The filter circuit 33 is connected in parallel to the inverter circuits 40, 50 and the smoothing capacitors 31, 32. The filter circuit 33 is provided between the battery 11 and the first smoothing capacitor 31. The filter circuit 33 has a filter coil, a filter capacitor, and the like. The filter coil is formed by a coil element. An example of the filter coil is a choke coil. The filter capacitor is formed by a capacitor element. An example of the filter capacitor is an X capacitor, a Y capacitor, and the like.

[0038] The inverter device 30 has an inverter control unit 35. The inverter control unit 35 controls the motor 20 via the inverter circuits 40, 50 and the switching circuit 60. The inverter control unit 35 generates command signals using the detection results of various sensors, and outputs these command signals to control the driving of the inverter circuits 40, 50 and the switching circuit 60. The inverter control unit 35 is sometimes referred to as a motor control unit.

[0039] The inverter control unit 35 is a control device such as an ECU. ECU is an abbreviation for Electronic Control Unit. The inverter control unit 35 has a processor, memory, and programs. The inverter control unit 35 is mainly configured with a computer. This computer has a processor, memory, input / output interface, buses connecting these, etc. A program is stored in the memory. The program is a program for performing flight control.

[0040] A processor is hardware for arithmetic processing coupled to memory. The processor executes various processes such as flight control processing by accessing memory. Memory is a storage medium that stores control programs and the like. For example, memory is a non-transitory tangible storage medium that non-temporarily stores computer-readable programs and data. A non-transitory tangible storage medium is a non-transitory tangible storage medium, and is realized by a semiconductor memory, a magnetic disk, or the like. A program contains computer-readable instructions that cause the processor to perform various functions. A processor is a processing unit that performs predetermined processing by executing instructions contained in a program.

[0041] The inverter control unit 35 has a control circuit 36, a first drive circuit 37a, a second drive circuit 37b, and a switching drive circuit 37c. The control circuit 36 ​​controls the inverter circuits 40, 50 and the switching circuit 60. The control circuit 36 ​​generates drive commands for driving the inverter circuits 40, 50 and the switching circuit 60. The drive commands include switching commands for switching the arm switches 42, 43, 52, 53 and the P switch 61. In FIG. 1 , the inverter control unit 35 is illustrated as an ECU, the control circuit 36 ​​as an MGECU, the first drive circuit 37a as GDB1, the second drive circuit 37b as GDB2, and the switching drive circuit 37c as GDB3.

[0042] The drive circuits 37a, 37b, and 37c are capable of independently switching multiple switches in response to drive commands. The drive circuits 37a, 37b, and 37c generate drive signals in response to the drive commands and output these drive signals to the inverter circuits 40 and 50 and the switching circuit 60. The first drive circuit 37a generates drive signals for driving the first upper arm switch 42 and the first lower arm switch 43 and outputs these drive signals to the first inverter circuit 40. The second drive circuit 37b generates drive signals for driving the second upper arm switch 52 and the second lower arm switch 53 and outputs these drive signals to the second inverter circuit 50. The switching drive circuit 37c generates a drive signal for driving the P switch 61 and outputs this drive signal to the switching circuit 60. The drive circuits 37a, 37b, and 37c are sometimes referred to as drivers or driver circuits.

[0043] The drive modes of the motor 20 include star connection drive and open connection drive. The inverter control unit 35 has star connection drive mode and open connection drive mode as control modes for controlling the motor 20. The drive regions showing the drive modes of the motor 20 include the star connection drive region and the open connection drive region. For example, in the drive regions, the horizontal axis represents the motor rotation speed and the vertical axis represents the motor torque. The star connection drive region is the normal region. The open connection drive region is a region where at least one of the motor rotation speed and motor torque is higher than in the star connection drive region. Star connection drive is sometimes called Y drive. Open connection drive is sometimes called H drive.

[0044] When the motor 20 is driven in a star-connection drive mode, the inverter circuit 40, 50 and the switching circuit 60 are driven in the inverter device 30 so that the second inverter circuit 50 forms a neutral point of the motor coil 22. In this case, the switching circuit 60 drives the P switch 61 to cut off the current flow through the switching P line 12pc. For example, the P switch 61 is set to a cut-off state. In addition, in the second inverter circuit 50, one of the second upper arm switch 52 and the second lower arm switch 53 is set to a conductive state and the other is set to a cut-off state for all three phases so that the three-phase motor coil 22 is star-connected. Then, the arm switches 42, 43 are switched in the first inverter circuit 40 so that the motor 20 is driven.

[0045] When the drive mode of the motor 20 is open connection drive, the inverter device 30 drives the second inverter circuit 50 so that the neutral point of the motor coil 22 is not formed. In this case, the neutral point of the motor coil 22 is opened, and the first inverter circuit 40 and the second inverter circuit 50 form an open connection circuit for each of the multiple phases. Also, in this case, the switching circuit 60 drives the P switch 61 so that the switching P line 12pc is energized. For example, the P switch 61 is energized.

[0046] As shown in FIG. 2, the motor 20 has a motor section 21 and a motor housing 24. The motor section 21 has a stator, a rotor, and a shaft. The stator is a fixed element and is fixed to the motor housing 24. The rotor is a rotating element and rotates relative to the stator. The shaft rotates together with the rotor. The motor section 21 has an armature and a field element. For example, the stator is the armature and the rotor is the field element. The motor coil 22 is included in the motor section 21. The motor coil 22 is included in the armature. For example, the motor coil 22 is included in the stator.

[0047] The motor housing 24 accommodates the motor unit 21. The motor housing 24 is made of a metal material or the like. The motor housing 24 is fixed to an inverter housing 70, which will be described later. The internal space of the motor housing 24 is open toward the inverter housing 70.

[0048] The motor 20 has a motor connector 25. The motor connector 25 is housed in the motor housing 24. The motor connector 25 is a connector member for electrically connecting the motor coil 22 to the inverter circuits 40, 50, etc. The motor connector 25 is detachably connected to an output connector 150, which will be described later. The motor connector 25 may also be provided on the outside of the motor housing 24.

[0049] The motor connector 25 has motor connector terminals 26. The motor connector terminals 26 are conductive members formed of a conductive material such as copper. The motor connector terminals 26 are terminal members for electrically connecting the motor coil 22 to the inverter circuits 40, 50, etc. The motor connector terminals 26 form part of the output line 12o of the motor 20. The motor connector 25 is provided with a plurality of motor connector terminals 26. The plurality of motor connector terminals 26 includes a motor connector terminal 26 that forms part of the first output line 12oa and a motor connector terminal 26 that forms part of the second output line 12ob. Wiring members such as bus bars and cables extend from the motor connector 25. These wiring members are members for electrically connecting the motor connector terminals 26 and the motor coil 22.

[0050] As shown in Figures 3 to 5, the inverter device 30 includes an inverter housing 70, a switching module 90, a first inverter module 100, a second inverter module 110, a first capacitor module 120, and a second capacitor module 130. The modules 90, 100, 110, 120, and 130 are electrical or electronic components. The modules 90, 100, 110, 120, and 130 are independent components. The modules 90, 100, 110, 120, and 130 are housed in the inverter housing 70. The modules 90, 100, 110, 120, and 130 are provided in the internal space of the inverter housing 70.

[0051] The inverter device 30 includes a plurality of wiring members, such as bus bars and cables. The plurality of wiring members includes wiring members that electrically connect the modules 90, 100, 110, 120, and 130 to one another. The plurality of wiring members also includes wiring members that form the P line 12p, wiring members that form the N line 12n, and wiring members that form the output line 12o. For example, the wiring members that form the P line 12p include wiring members that form the first P line 12pa and wiring members that form the second P line 12pb. The wiring members that form the N line 12n include wiring members that form the first N line 12na and wiring members that form the second N line 12nb. The wiring members that form the output line 12o include wiring members that form the first output line 12oa and wiring members that form the second output line 12ob. Note that the electrically connecting of multiple components by wiring members is sometimes simply referred to as "wiring members connecting multiple components."

[0052] In the inverter device 30, the modules 90, 100, 110, 120, and 130 may generate heat as the inverter device 30 is driven. The modules 90, 100, 110, 120, and 130 are sometimes referred to as heat-generating components. For example, the switching module 90 is likely to generate heat as the switching circuit 60 is energized and driven. The first inverter module 100 is likely to generate heat as the first inverter circuit 40 is energized and driven. The second inverter module 110 is likely to generate heat as the second inverter circuit 50 is energized and driven. The first capacitor module 120 is likely to generate heat as the first smoothing capacitor 31 is energized. The second capacitor module 130 is likely to generate heat as the second smoothing capacitor 32 is energized.

[0053] In the inverter device 30, the drive states of the inverter circuits 40, 50 differ depending on the drive mode of the motor 20. For example, when the drive mode of the motor 20 is star-connection drive, the arm switches 52, 53 in the second inverter circuit 50 are hardly switched. On the other hand, the arm switches 42, 43 in the first inverter circuit 40 are repeatedly switched. In this case, the first inverter module 100 is more likely to generate heat than the second inverter module 110. When the drive mode of the motor 20 is open-connection drive, switching is performed in the same manner in the first inverter circuit 40 and the second inverter circuit 50. In this case, the first inverter module 100 and the second inverter module 110 are equally likely to generate heat.

[0054] In the inverter device 30, the heat generation state in the capacitor modules 120, 130 differs depending on the driving mode of the motor 20. If the inverter modules 100, 110 are likely to generate heat, the capacitor modules 120, 130 may also be likely to generate heat. For example, if the first inverter module 100 is more likely to generate heat than the second inverter module 110, the first capacitor module 120 is more likely to generate heat than the second capacitor module 130.

[0055] The inverter housing 70 is made of a metal material or the like. The inverter housing 70 has thermal conductivity. For example, the inverter housing 70 is formed in a rectangular shape as a whole in a plan view. The inverter housing 70 corresponds to a housing. The internal space of the inverter housing 70 has a first space 71a and a second space 75a. The internal space of the inverter housing 70 is partitioned into two spaces. One of the two spaces is the first space 71a, and the other is the second space 75a. The modules 90, 100, 110, 120, and 130 are accommodated in one of the first space 71a and the second space 75a.

[0056] The inverter housing 70 has an inverter case portion 701 and an inverter lid portion 702. The inverter case portion 701 has a case outer wall 701a and a case partition wall 701b. The case outer wall 701a and the inverter lid portion 702 form the outer surface of the inverter housing 70. The case partition wall 701b is provided on the inner peripheral side of the case outer wall 701a.

[0057] The case partition wall 701b divides the internal space of the inverter housing 70 into a first space 71a and a second space 75a. The first space 71a and the second space 75a are aligned in the height direction Z. For the motor unit 15, the width direction X, the depth direction Y, and the height direction Z are perpendicular to one another. In the motor unit 15, the motor housing 24 and the inverter housing 70 are aligned in the height direction Z. In the height direction Z, the first space 71a is located between the motor housing 24 and the second space 75a. The first space 71a is covered by the motor housing 24. The inverter housing 70 covers the internal space of the motor housing 24. For example, the first space 71a and the internal space of the motor housing 24 are continuous spaces.

[0058] The inverter housing 70 has a case outer wall 701a that is partially recessed inward. This recess forms a step on the outer surface of the inverter housing 70. In the inverter housing 70, the width of the second space 75a in the width direction X is smaller than the width of the first space 71a. In the depth direction Y, the width of the second space 75a and the width of the first space 71a are approximately the same.

[0059] The inverter lid portion 702 is provided on the opposite side of the inverter case portion 701 from the motor housing 24. The inverter lid portion 702 covers the second space 75a from the opposite side to the first space 71a.

[0060] The inverter housing 70 has a first housing portion 71 and a second housing portion 75. The first housing portion 71 is a portion of the inverter housing 70 that forms a first space 71a. The second housing portion 75 is a portion of the inverter housing 70 that forms a second space 75a. The first housing portion 71 and the second housing portion 75 are aligned in the height direction Z. The case partition wall 701b includes the boundary between the first housing portion 71 and the second housing portion 75.

[0061] The first housing portion 71 has a first outer peripheral wall 72 and a first bottom 73. The first outer peripheral wall 72 forms the outer peripheral surface of the inverter housing 70. The first space 71a is an inner space of the first outer peripheral wall 72. The first bottom 73 extends in a direction perpendicular to the height direction Z. The first outer peripheral wall 72 extends from the first bottom 73 in the height direction Z. The first outer peripheral wall 72 has a first width wall 72x and a first depth wall 72y. The first width walls 72x are arranged in pairs in the depth direction Y with the first space 71a interposed therebetween. The first width walls 72x extend as a whole in the width direction X. The first depth walls 72y are arranged in pairs in the width direction X with the first space 71a interposed therebetween. The first depth walls 72y extend as a whole in the depth direction Y.

[0062] The second housing portion 75 has a second outer peripheral wall 76, a second bottom portion 77, and a second ceiling portion 78. The second outer peripheral wall 76 forms the outer peripheral surface of the inverter housing 70. The second space 75a is an inner space of the second outer peripheral wall 76. The second bottom portion 77 and the second ceiling portion 78 extend in a direction perpendicular to the height direction Z. The second bottom portion 77 and the second ceiling portion 78 are aligned in the height direction Z with the second space 75a interposed therebetween. The second outer peripheral wall 76 extends in the height direction Z so as to span between the second bottom portion 77 and the second ceiling portion 78. The second outer peripheral wall 76 has a second width wall 76x and a second depth wall 76y. The second width wall 76x extends in the width direction X as a whole. The second depth walls 76y are aligned in a pair in the width direction X with the second space 75a interposed therebetween. The second depth walls 76y extend in the depth direction Y as a whole.

[0063] In the inverter housing 70, one second width wall 76x extends in the height direction Z from one first width wall 72x, and the other second width wall 76x extends in the height direction Z from the other first width wall 72x. Furthermore, one second depth wall 76y extends in the height direction Z from one first depth wall 72y, while the other second depth wall 76y is provided at a position away from the other first depth wall 72y toward the one second depth wall 76y. The other second depth wall 76y is provided between the pair of first depth walls 72y.

[0064] The inverter case 701 is formed to include the first housing 71 and a portion of the second housing 75. In the second housing 75, a portion of the second outer peripheral wall 76 and a second bottom 77 are included in the inverter case 701. The inverter lid 702 is formed to include a portion of the second housing 75. In the second housing 75, a portion of the second outer peripheral wall 76 and a second ceiling 78 are included in the inverter lid 702.

[0065] 3, the first inverter module 100 has a first inverter circuit 40. The first inverter module 100 is a component that converts the power supplied to the motor coil 22 by the first inverter circuit 40. The first inverter module 100 corresponds to a first inverter component.

[0066] The first inverter module 100 has a first upper switch unit 101, a first lower switch unit 102, and a first switch protection unit 103. The first upper switch unit 101 is a component having a first upper arm switch 42. The first lower switch unit 102 is a component having a first lower arm switch 43. The switch units 101, 102 form the arm switches 42, 43. The switch units 101, 102 are formed of semiconductor chips or the like. The first switch protection unit 103 protects the switch units 101, 102. The first switch protection unit 103 is formed including a circuit board, sealing resin, and the like. For example, in the first inverter module 100, the switch units 101, 102 mounted on a circuit board are sealed with sealing resin.

[0067] The first inverter module 100 has switch units 101 and 102 for each of the multiple phases. The first inverter module 100 is formed in the shape of a rectangular plate as a whole. Multiple switch units 101 and 102 are arranged along the plate surface of the first inverter module 100. For example, multiple switch units 101 and 102 are arranged along the long side of the first inverter module 100.

[0068] The first inverter module 100 has a first P terminal 104, a first N terminal 105, and a first output terminal 106. The terminals 104 to 106 are conductive members formed of a conductive material such as copper. Wiring members are electrically connected to each of the terminals 104 to 106. The first P terminal 104 is a terminal member for connecting the first upper arm switch 42 to the first P line 12pa. For example, the first P terminal 104 forms part of the first P line 12pa. The first N terminal 105 is a terminal member for connecting the first lower arm switch 43 to the first N line 12na. For example, the first N terminal 105 forms part of the first N line 12na.

[0069] The first output terminal 106 is a terminal member for connecting the first upper arm switch 42 and the first lower arm switch 43 to the motor coil 22. For example, the first output terminal 106 forms a part of the first output line 12oa. The first output terminal 106 corresponds to a first path terminal.

[0070] The terminals 104 to 106 are arranged along the outer peripheral edge of the first inverter module 100. The terminals 104 to 106 are provided so as to protrude outward from the first switch protection unit 103. For example, multiple terminals 104 to 106 are arranged along the long side of the first inverter module 100. The first output terminal 106 is provided on the opposite side of the first switch protection unit 103 from the first P terminal 104 and the first N terminal 105.

[0071] The second inverter module 110 has a second inverter circuit 50. The second inverter module 110 is a component that converts the power supplied to the motor coil 22 by the second inverter circuit 50. The second inverter module 110 corresponds to a second inverter component.

[0072] The second inverter module 110 has a second upper switch unit 111, a second lower switch unit 112, and a second switch protection unit 113. The second upper switch unit 111 is a component that has a second upper arm switch 52. The second lower switch unit 112 is a component that has a second lower arm switch 53. The switch units 111 and 112 are formed of semiconductor chips or the like. The second switch protection unit 113 protects the switch units 111 and 112. The second switch protection unit 113 is formed to include a circuit board, sealing resin, and the like. For example, in the second inverter module 110, the switch units 111 and 112 mounted on a circuit board are sealed with sealing resin.

[0073] The second inverter module 110 has switch units 111, 112 for each of the multiple phases. The second inverter module 110 is formed as a rectangular plate overall. The plate surface of the second inverter module 110 extends in a direction perpendicular to the height direction Z. Multiple switch units 111, 112 are arranged along the plate surface of the second inverter module 110. For example, multiple switch units 111, 112 are arranged along the long side of the second inverter module 110.

[0074] The second inverter module 110 has a second P terminal 114, a second N terminal 115, and a second output terminal 116. The terminals 204 to 206 are conductive members formed of a conductive material such as copper. Wiring members are electrically connected to each of the terminals 204 to 206. The second P terminal 114 is a terminal member for connecting the second upper arm switch 52 to the second P line 12pb. For example, the second P terminal 114 forms part of the second P line 12pb. The second N terminal 115 is a terminal member for connecting the second lower arm switch 53 to the second N line 12nb. For example, the second N terminal 115 forms part of the second N line 12nb.

[0075] The second output terminal 116 is a terminal member for connecting the second upper arm switch 52 and the second lower arm switch 53 to the motor coil 22. For example, the second output terminal 116 forms a part of the second output line 12ob. The second output terminal 116 corresponds to a second path terminal.

[0076] The terminals 204 to 206 are arranged along the outer circumferential edge of the second inverter module 110. The terminals 204 to 206 are provided so as to protrude outward from the second switch protection unit 113. For example, multiple terminals 204 to 206 are arranged along the long side of the second inverter module 110. The second output terminal 116 is provided on the opposite side of the second switch protection unit 113 from the second P terminal 114 and the second N terminal 115.

[0077] The first inverter module 100 and the second inverter module 110 are the same inverter component. Two identical inverter components are housed in the inverter housing 70. One of the two inverter components is used as the first inverter module 100, and the other is used as the second inverter module 110. For example, in the first inverter module 100 and the second inverter module 110, the positional relationship between the first upper switch unit 101 and the first lower switch unit 102 is the same as the positional relationship between the second upper switch unit 111 and the second lower switch unit 112.

[0078] The first inverter module 100 and the second inverter module 110 may be the same inverter component if the model numbers or the like assigned to the products are the same for the first inverter module 100 and the second inverter module 110. If the model numbers or the like are the same, the first inverter module 100 and the second inverter module 110 are the same component even if the shapes and sizes of the switch units 101, 102, 111, 112 and the switch protection units 103, 113 are slightly different.

[0079] The inverter component has an inverter circuit formed with a plurality of switching elements. In the inverter component used as the first inverter module 100, one of the plurality of switching elements is used as the first upper arm switch 42, and another is used as the first lower arm switch 43. The inverter component also has a plurality of switch units and switch protection units. In the inverter component used as the first inverter module 100, some switch units are used as the first upper switch units 101, and some other switch units are used as the first lower switch units 102. In this inverter component, the switch protection unit is used as the first switch protection unit 103.

[0080] In the inverter component used as the second inverter module 110, one of the multiple switching elements is used as the second upper arm switch 52, and another is used as the second lower arm switch 53. In addition, in the inverter component used as the second inverter module 110, some switch units are used as the second upper switch units 111, and other switch units are used as the second lower switch units 112. In addition, in this inverter component, a switch protection unit is used as the second switch protection unit 113.

[0081] The first capacitor module 120 forms the first smoothing capacitor 31. The first capacitor module 120 is formed in a rectangular parallelepiped shape as a whole. The first capacitor module 120 corresponds to the first capacitor component and the capacitor part. The first capacitor module 120 has a first capacitor section 121 and a first capacitor protection section 122. The first capacitor section 121 is a component that has the first smoothing capacitor 31. The first capacitor protection section 122 protects the first capacitor section 121. The first capacitor protection section 122 is formed to include a case, sealing resin, etc.

[0082] The second capacitor module 130 forms the second smoothing capacitor 32. The second capacitor module 130 is formed in a rectangular parallelepiped shape as a whole. The second capacitor module 130 corresponds to the second capacitor component and the capacitor part. The second capacitor module 130 has a second capacitor section 131 and a second capacitor protection section 132. The second capacitor section 131 is a component that has the second smoothing capacitor 32. The second capacitor protection section 132 protects the second capacitor section 131. The second capacitor protection section 132 is formed to include a case, sealing resin, etc.

[0083] The inverter device 30 has a first capacitor wiring 145 and a second capacitor wiring 146. The capacitor wirings 145, 146 extend from the capacitor modules 120, 130. The capacitor wirings 145, 146 are electrically connected to the inverter modules 100, 110, a filter component 180 (described later), and the like. The first capacitor wiring 145 includes a wiring member that forms at least a portion of the P line 12p and a wiring member that forms at least a portion of the N line 12n. The first capacitor wiring 145 is electrically connected to the first capacitor section 121. The second capacitor wiring 146 includes a wiring member that forms at least a portion of the P line 12p and a wiring member that forms at least a portion of the N line 12n. The second capacitor wiring 146 is electrically connected to the second capacitor section 131.

[0084] The switching module 90 forms the switching circuit 60. The switching module 90 is a component that can cut off the current flow to the switching P line 12pc using a P switch 61. The switching module 90 corresponds to a switching component. The switching module 90 has a P switch section 91 and a changeover switch protection section 93. The P switch section 91 is a component that has the P switch 61. The P switch section 91 forms the P switch 61. The P switch section 91 is formed of a semiconductor chip or the like. The changeover switch protection section 93 protects the P switch section 91. The changeover switch protection section 93 is formed to include a circuit board, sealing resin, and the like. For example, in the switching module 90, the P switch section 91 mounted on the circuit board is sealed with sealing resin.

[0085] The switching module 90 has a first switching P terminal 94 and a second switching P terminal 95. The switching P terminals 94, 95 are conductive members formed of a conductive material such as copper. Wiring members are electrically connected to each of the switching P terminals 94, 95. The first switching P terminal 94 is a terminal member for connecting the P switch 61 to the first P line 12pa. For example, the first switching P terminal 94 forms part of the switching P line 12pc. The second switching P terminal 95 is a terminal member for connecting the P switch 61 to the second P line 12pb. For example, the second switching P terminal 95 forms part of the switching P line 12p.

[0086] The switching P terminals 94, 95 are arranged along the outer peripheral edge of the switching module 90. The switching P terminals 94, 95 are provided so as to protrude outward from the changeover switch protector 93. For example, the first switching P terminal 94 is provided on the opposite side of the changeover switch protector 93 from the second switching P terminal 95.

[0087] The inverter device 30 has an output connector 150. The output connector 150 is accommodated in the inverter housing 70. The output connector 150 is a connector member for electrically connecting the inverter circuits 40, 50 to the motor coil 22 and the like. The output connector 150 is detachably connected to the motor connector 25. The output connector 150 is detachably connected to the motor coil 22 side. The output connector 150 corresponds to an inverter connector. Note that at least a portion of the output connector 150 may be provided outside the inverter housing 70.

[0088] The output connector 150 has an output connector case 151 and an output connector terminal 152. The output connector terminal 152 is a conductive member formed of a conductive material such as copper. The output connector terminal 152 is a terminal member for electrically connecting the inverter circuits 40, 50 to the motor coil 22, etc. The output connector terminal 152 forms a part of the output line 12o in the inverter device 30.

[0089] When the output connector 150 and the motor connector 25 are connected to each other, the output connector terminal 152 and the motor connector terminal 26 are electrically connected. In the motor unit 15, the inverter housing 70 is assembled to the motor housing 24, so that the output connector 150 is connected to the motor connector 25.

[0090] A plurality of output connector terminals 152 are provided on the output connector 150. The plurality of output connector terminals 152 include a first connector terminal 152a and a second connector terminal 152b. The first connector terminal 152a forms a part of the first output line 12oa. The first connector terminal 152a is provided for each of the plurality of phases. The second connector terminal 152b forms a part of the second output line 12ob. The second connector terminal 152b is provided for each of the plurality of phases.

[0091] The output connector case 151 accommodates the output connector terminals 152. The output connector case 151 is formed in a plate shape as a whole. The output connector case 151 has an output plate surface 151a and an output opposing surface 151b. The output plate surfaces 151a are the plate surfaces of the output connector case 151 and are arranged in pairs in the thickness direction of the output connector case 151. The output plate surfaces 151a correspond to the connector plate surface. The output opposing surface 151b is one of a pair of end surfaces of the output connector case 151. The output opposing surface 151b is the surface that faces the motor connector 25 when the output connector 150 and the motor connector 25 are connected. The output opposing surface 151b exposes at least a portion of the output connector terminal 152. The portion of the output connector terminal 152 exposed on the output opposing surface 151b is electrically connected to the motor connector terminal 26.

[0092] A plurality of output connector terminals 152 are arranged along the output plate surface 151a and the output opposing surface 151b in the output connector case 151. For example, the output connector terminals 152 extend in a direction perpendicular to the output opposing surface 151b. The first connector terminals 152a and the second connector terminals 152b are arranged along the output opposing surface 151b. A plurality of the first connector terminals 152a and the second connector terminals 152b are arranged along the output opposing surface 151b.

[0093] The inverter device 30 has a first output wiring 143 and a second output wiring 144. The output wirings 143, 144 extend from an output connector 150. The output wirings 143, 144 are electrically connected to the inverter modules 100, 110, etc. The first output wiring 143 is a wiring member that forms at least a portion of the first output line 12oa. The first output wiring 143 is wired so as to span between the first connector terminal 152a and the first output terminal 106. The first output wiring 143 is electrically connected to each of the first connector terminal 152a and the first output terminal 106. The second output wiring 144 is a wiring member that forms at least a portion of the second output line 12ob. The second output wiring 144 is wired so as to span between the second connector terminal 152b and the second output terminal 116. The second output wiring 144 is electrically connected to each of the second connector terminal 152b and the second output terminal 116.

[0094] The inverter device 30 includes a first drive board 171, a second drive board 172, a switching drive board 173, and a control board 174. The drive boards 171-173 and the control board 174 are formed of circuit boards such as printed circuit boards. The drive boards 171-173 and the control board 174 are formed as a whole in the shape of a rectangular plate. The first drive board 171 forms at least a part of the first drive circuit 37a. The second drive board 172 forms at least a part of the second drive circuit 37b. The switching drive board 173 forms at least a part of the switching drive circuit 37c. The control board 174 forms at least a part of the control circuit 36. The boards 171-174 are communicatively connected to one another via wiring members such as communication lines. For example, the control board 174 is communicatively connected to each of the first drive board 171, the second drive board 172, and the switching drive board 173.

[0095] As shown in FIG. 4 , the inverter device 30 has a filter component 180. The filter component 180 is housed in the inverter housing 70. The filter component 180 is an electric or electronic component. The filter component 180 forms at least a part of the filter circuit 33. The filter component 180 is a component for forming the filter circuit 33. A plurality of filter components 180 are provided in the internal space of the inverter housing 70. The plurality of filter components 180 includes a filter coil component 181 and a filter capacitor component 182. The filter coil component 181 forms a coil element such as a filter coil. A coil element is sometimes referred to as a reactor element. The filter capacitor component 182 forms a capacitor element such as a filter capacitor.

[0096] The inverter device 30 includes a filter component group 180G. The filter component group 180G is housed in the inverter housing 70. The filter component group 180G is formed by at least two filter components 180. In the filter component group 180G, a plurality of filter components 180 are arranged in a group. In the filter component group 180G, two adjacent filter components 180 are located close to each other. In the filter component group 180G, current sensor wirings 141 to 146, which will be described later, may be provided between adjacent filter components 180. In the filter component group 180G, modules 90, 100, 110, 120, 130, etc. are not provided between two adjacent filter components 180.

[0097] The filter component group 180G does not necessarily include all of the filter components 180 housed in the inverter housing 70. For example, it is sufficient that at least two of the multiple filter components 180 housed in the inverter housing 70 are included in the filter component group 180G.

[0098] The inverter device 30 has an input connector 160. The input connector 160 is accommodated in the inverter housing 70. The input connector 160 is a connector member for connecting the inverter circuits 40, 50, etc. to the battery 11 so that electricity can be conducted therethrough. A power supply connector on the battery 11 side is detachably connected to the input connector 160. The power supply connector is a connector member for supplying power from the battery 11 to the motor unit 15. Note that at least a portion of the input connector 160 may be provided outside the inverter housing 70.

[0099] The input connector 160 has an input connector case 161 and input connector terminals 162. The input connector terminals 162 are conductive members formed of a conductive material such as copper. The input connector terminals 162 are terminal members for connecting the inverter circuits 40, 50 and the like to the battery 11 so that electricity can be passed therethrough. The input connector terminals 162 form part of the P line 12p and part of the N line 12n.

[0100] A plurality of input connector terminals 162 are provided on the input connector 160. The plurality of input connector terminals 162 include a P connector terminal 162a and an N connector terminal 162b. The P connector terminal 162a forms a part of the P line 12p. The N connector terminal 162b forms a part of the N line 12n.

[0101] The input connector case 161 houses the input connector terminals 162. The input connector case 161 is formed in a plate shape overall. The input connector case 161 has an input plate surface 161a and an input opposing surface 161b. The input plate surfaces 161a are plate surfaces of the input connector case 161, and are arranged in pairs in the thickness direction of the input connector case 161. The input opposing surface 161b is one of a pair of end surfaces of the input connector case 161. The input opposing surface 161b is the surface that faces the power supply connector when the input connector 160 and the power supply connector are connected. The input opposing surface 161b exposes at least a portion of the input connector terminals 162.

[0102] A plurality of input connector terminals 162 are arranged along the input plate surface 161a and the input facing surface 161b in the input connector case 161. For example, the input connector terminals 162 extend in a direction perpendicular to the input facing surface 161b. The P connector terminal 162a and the N connector terminal 162b are arranged along the input facing surface 161b. For example, each of the plurality of input connector terminals 162 includes one P connector terminal 162a and one N connector terminal 162b.

[0103] The inverter device 30 has a P input wiring 141 and an N input wiring 142. The input wirings 141, 142 extend from an input connector 160. The input wirings 141, 142 are electrically connected to a filter component 180 and the like. The P input wiring 141 is a wiring member that forms at least a part of the P line 12p. The P input wiring 141 is electrically connected to a P connector terminal 162a. The N input wiring 142 is a wiring member that forms at least a part of the N line 12n. The N input wiring 142 is electrically connected to an N connector terminal 162b.

[0104] As shown in FIGS. 3 to 5 , the inverter device 30 has a cooler 80. The cooler 80 is capable of cooling the inverter device 30. The cooler 80 cools the inverter device 30 using a refrigerant. The refrigerant is a liquid such as water. The refrigerant may also be a gas such as air. The refrigerant may be any fluid. The cooler 80 is configured so that the refrigerant flows inside the cooler 80. The cooler 80 is included in a cooling device. The cooling device is mounted on the moving body together with the drive system 10. The cooling device has a pump for flowing the refrigerant through the cooler 80. In the cooling device, the refrigerant flows through the cooler 80 when the pump is driven. The cooling device has a connecting pipe for connecting the pump and the cooler 80. In the cooling device, the refrigerant flows through both the cooler 80 and the connecting pipe.

[0105] The cooler 80 has a water channel 81, a water channel wall 82, a first water channel connector 83, and a second water channel connector 84. The water channel 81 is a refrigerant flow path for flowing the refrigerant. The inverter housing 70 forms at least a part of the water channel 81. The cooler 80 has a water channel forming portion that forms the water channel 81. The water channel forming portion includes the water channel wall 82 and the water channel connectors 83 and 84. The water channel wall 82 and the water channel connectors 83 and 84 form at least a part of the water channel 81. The water channel wall 82 corresponds to the flow path forming portion. Note that the water channel forming portion may include piping members, etc.

[0106] The water channel 81 and the water channel wall 82 are provided at least between the first space 71a and the second space 75a. The water channel 81 and the water channel wall 82 extend along the first bottom 73. The water channel wall 82 includes a portion of the first outer peripheral wall 72, the first bottom 73, a portion of the second outer peripheral wall 76, and the second bottom 77. The water channel wall 82 includes a portion of the case outer wall 701a and the case partition wall 701b. At the stepped portion of the inverter housing 70, the water channel 81 and the water channel wall 82 extend along the outer surface of the inverter housing 70.

[0107] The channel wall 82 is a wall portion extending in a direction perpendicular to the height direction Z. The channel wall 82 has a first channel wall surface 82a and a second channel wall surface 82b. Of the pair of wall surfaces that the channel wall 82 has, one is the first channel wall surface 82a and the other is the second channel wall surface 82b. The first channel wall surface 82a and the second channel wall surface 82b extend in a direction perpendicular to the height direction Z. At least a portion of the channel wall 82 separates the first space 71a and the second space 75a. The channel wall 82 corresponds to a space partition portion. The channel wall 82 is sometimes referred to as a space partition wall. The first channel wall surface 82a partitions the first space 71a. The second channel wall surface 82b partitions the second space 75a.

[0108] The water channel 81 is provided inside the water channel wall 82. The water channel 81 is provided in the water channel wall 82 between a first water channel wall surface 82a and a second water channel wall surface 82b. The water channel 81 extends along the water channel wall surfaces 82a, 82b. The water channel 81 has a first water channel port 811 and a second water channel port 812. One of the pair of ends of the water channel 81 is the first water channel port 811, and the other is the second water channel port 812. The water channel 81 forms a single flow path extending along the water channel wall surfaces 82a, 82b. In the water channel 81, the refrigerant flows in through one of the first water channel port 811 and the second water channel port 812, and flows out through the other. That is, one of the first water channel port 811 and the second water channel port 812 is an inlet, and the other is an outlet.

[0109] The water channel connectors 83, 84 are connector members for connecting the connection pipes of the cooling device to the water channel 81. The water channel connectors 83, 84 are provided on the outer surface of the inverter housing 70. The water channel connectors 83, 84 extend outward from the case outer wall 701a. For example, the water channel connectors 83, 84 are provided at positions spanning the boundary between the first outer peripheral wall 72 and the second outer peripheral wall 76 in the height direction Z. The first water channel connector 83 forms a first water channel port 811. The second water channel connector 84 forms a second water channel port 812.

[0110] A channel wall hole 85 is provided in the channel wall 82. The channel wall hole 85 is a hole that penetrates the channel wall 82 in the height direction Z. At least one channel wall hole 85 is provided in the channel wall 82. The channel wall hole 85 and the channel 81 are aligned in a direction perpendicular to the height direction Z. The channel wall hole 85 is provided at a position separated from the channel 81 in the direction perpendicular to the height direction Z. The channel wall hole 85 connects the first space 71a and the second space 75a.

[0111] The inverter device 30 has a current sensor. The current sensor has a sensor element such as a Hall element. The current sensor is a current detection unit that detects the current flowing through the output line 12o. The current sensor may also detect the current flowing through the P line 12p or the N line 12n.

[0112] In this embodiment, the modules 90, 100, 110, 120, and 130 are housed in either the first space 71a or the second space 75a. As shown in Figures 3 and 5, the modules 90, 100, 110, 120, and 130 are housed only in the first space 71a out of the first space 71a and the second space 75a. The modules 90, 100, 110, 120, and 130 are arranged along the first water channel wall surface 82a. The modules 90, 100, 110, 120, and 130 are arranged in a direction perpendicular to the height direction Z.

[0113] The first inverter module 100 is provided adjacent to the first capacitor module 120 and the second inverter module 110. The second capacitor module 130 is provided adjacent to the first capacitor module 120 and the second inverter module 110. For example, the first inverter module 100 and the second inverter module 110 are arranged adjacent to each other in the width direction X. The first capacitor module 120 and the second capacitor module 130 are arranged adjacent to each other in the width direction X. The first inverter module 100 and the first capacitor module 120 are arranged adjacent to each other in the depth direction Y. The second inverter module 110 and the second capacitor module 130 are arranged adjacent to each other in the depth direction Y.

[0114] The switching module 90 is provided at a position adjacent to at least one of the first capacitor module 120 and the second capacitor module 130. For example, the switching module 90 and one of the first capacitor module 120 and the second capacitor module 130 are arranged adjacent to each other in the depth direction Y. In this embodiment, the switching module 90 and the second capacitor module 130 are provided at positions adjacent to each other. The switching module 90 is provided on the opposite side of the inverter modules 100, 110 across the capacitor modules 120, 130. For example, the switching module 90 is provided on the opposite side of the second capacitor module 130 from the second inverter module 110.

[0115] Among the modules 90, 100, 110, 120, and 130, current sensors and wirings 141 to 146 may be provided between two modules that are provided adjacent to each other.

[0116] The output connector 150 is accommodated in the first space 71a. The output connector 150 is provided adjacent to the inverter modules 100, 110. At least a portion of the output connector 150 is provided adjacent to at least one of the first inverter module 100 and the second inverter module 110 in a direction perpendicular to the arrangement direction of the inverter modules 100, 110. For example, the output connector 150 is provided adjacent to both the first inverter module 100 and the second inverter module 110 in the depth direction Y. The output connector 150 is provided so as to span between the first inverter module 100 and the second inverter module 110 in the width direction X. The output connector 150 is provided adjacent to each of the first inverter module 100 and the second inverter module 110. Note that wiring members, current sensors, etc. may be provided between the output connector 150 and the inverter modules 100, 110. In this embodiment, the width direction X corresponds to the direction in which the inverter modules 100 and 110 are arranged, and the depth direction Y corresponds to the orthogonal direction.

[0117] The output connector 150 is provided on the opposite side of the inverter modules 100, 110 from the capacitor modules 120, 130. In the depth direction Y, the switching module 90 is provided between one of the pair of first width walls 72x and the capacitor modules 120, 130. The output connector 150 is provided between the other of the pair of first width walls 72x and the inverter modules 100, 110. In the depth direction Y, output terminals 106, 116 are provided between the output connector 150 and the switch protectors 103, 113.

[0118] The output connector 150 is provided so as to extend in the height direction Z. In the output connector 150, an output plate surface 151a extends in a direction perpendicular to the depth direction Y. In the output connector 150, an output opposing surface 151b extends in a direction perpendicular to the height direction Z. The output opposing surface 151b faces the motor connector 25 side in the height direction Z. The output connector 150 is placed on one of the first width walls 72x. In the output connector 150, a plurality of connector terminals 26 are arranged in the width direction X along the first width wall 72x.

[0119] The inverter modules 100, 110 extend in a direction perpendicular to the height direction Z. The drive boards 171, 172 extend in a direction perpendicular to the height direction Z. The first inverter module 100 and the first drive board 171 are aligned in the height direction Z. The first drive board 171 is stacked on the first inverter module 100. The first inverter module 100 is provided between the water channel wall 82 and the first drive board 171 in the height direction Z. The second inverter module 110 and the second drive board 172 are aligned in the height direction Z. The second drive board 172 is stacked on the second inverter module 110. The second inverter module 110 is provided between the water channel wall 82 and the second drive board 172 in the height direction Z.

[0120] The inverter modules 100, 110 are arranged such that the P terminals 104, 114 and N terminals 105, 115 and the output terminals 106, 116 are aligned in the depth direction Y. In the inverter modules 100, 110, the P terminals 104, 114 and N terminals 105, 115 are located on the capacitor module 120, 130 side. The P terminals 104, 114 and N terminals 105, 115 are located between the switch protectors 103, 113 and the capacitor modules 120, 130 in the depth direction Y. In the inverter modules 100, 110, the output terminals 106, 116 are located on the output connector 150 side. The output terminals 106, 116 are located between the switch protectors 103, 113 and the output connector 150 in the depth direction Y.

[0121] The control board 174 extends in a direction perpendicular to the height direction Z. At least a portion of the control board 174 is provided in a position aligned with at least one of the first drive board 171 and the second drive board 172 in the height direction Z. The control board 174 is placed on top of one of the first drive board 171 and the second drive board 172. For example, the control board 174 and the second drive board 172 are aligned in the height direction Z. The control board 174 is provided on the opposite side of the water channel wall 82 in the height direction Z, with the second inverter module 110 and the second drive board 172 between them.

[0122] The switching module 90 extends in a direction perpendicular to the height direction Z. The switching drive board 173 extends in a direction perpendicular to the height direction Z. The switching module 90 and the switching drive board 173 are aligned in the height direction Z. The switching drive board 173 is stacked on top of the switching module 90. The switching module 90 is provided between the water channel wall 82 and the switching drive board 173 in the height direction Z. The switching module 90 is provided with the first switching P terminal 94 and the second switching P terminal 95 aligned in the width direction X.

[0123] The water channel wall 82 is provided with a first wiring hole 85a as a water channel wall hole 85. The first wiring hole 85a is a hole for inserting wiring members. Wiring members forming the P line 12p and wiring members forming the N line 12n are inserted into the first wiring hole 85a. The wiring members inserted into the first wiring hole 85a are connected to the switching module 90 and the capacitor module 120. The first wiring hole 85a is provided at a position closer to the first switching P terminal 94 out of the first switching P terminal 94 and the second switching P terminal 95.

[0124] The water channel 81 provides a cooling effect of the refrigerant to the first space 71a. In the first space 71a, the cooling effect of the refrigerant is provided to the modules 90, 100, 110, 120, and 130, the output connector 150, the wiring 143 to 146, and the like. At least one of the modules 90, 100, 110, 120, and 130 is provided in a position aligned with the water channel 81 in the height direction Z. For example, the switching module 90 and the inverter modules 100 and 110 are positioned so as to overlap with the water channel 81 in the height direction Z.

[0125] The water passage 81 has a first inverter path 81a, a second inverter path 81b, and a switching path 81c. The first inverter path 81a is a portion of the water passage 81 that overlaps the first inverter module 100. The first inverter path 81a is located so as to overlap at least the first upper switch unit 101 and the first lower switch unit 102. The second inverter path 81b is a portion of the water passage 81 that overlaps the second inverter module 110. The second inverter path 81b is located so as to overlap at least the second upper switch unit 111 and the second lower switch unit 112. The switching path 81c is a portion of the water passage 81 that overlaps the switching module 90. The switching path 81c is located so as to overlap at least the P switch 61. In the water passage 81, the first inverter path 81a, the second inverter path 81b, and the switching path 81c are aligned in the refrigerant flow direction. The flow direction of the refrigerant is the direction in which the first water channel port 811 and the second water channel port 812 are aligned in the water channel 81 .

[0126] The refrigerant flowing through the water passage 81 passes through one of the first inverter path 81a and the second inverter path 81b before passing through the other. That is, the refrigerant flowing through the water passage 81 reaches one of the first inverter module 100 and the second inverter module 110 before reaching the other. For example, in a configuration in which the refrigerant flows through the water passage 81 with the first water passage port 811 as an inlet, the refrigerant reaches the second inverter module 110 in the water passage 81 before reaching the first inverter module 100. In addition, in a configuration in which the refrigerant flows through the water passage 81 with the second water passage port 812 as an inlet, the refrigerant reaches the first inverter module 100 in the water passage 81 before reaching the second inverter module 110.

[0127] The refrigerant flowing through the water passage 81 passes through the first inverter path 81a, the second inverter path 81b, and the switching path 81c in sequence. That is, the refrigerant flowing through the water passage 81 reaches the first inverter module 100, the second inverter module 110, and the switching module 90 in sequence. For example, in a configuration in which the refrigerant flows through the water passage 81 with the first water passage port 811 serving as an inlet, the refrigerant reaches the switching module 90 in the water passage 81, then the second inverter module 110, and then the first inverter module 100. In a configuration in which the refrigerant flows through the water passage 81 with the second water passage port 812 serving as an inlet, the refrigerant reaches the first inverter module 100 in the water passage 81, then the second inverter module 110, and then the switching module 90.

[0128] 4 and 5, the filter component 180 is housed in the second space 75a. A plurality of the filter components 180 are arranged along the second water passage wall surface 82b. For example, the plurality of filter components 180 are arranged as a whole in the depth direction Y along the second depth wall 76y.

[0129] The input connector 160 is accommodated in the second space 75a. The input connector 160 is provided in an orientation perpendicular to the height direction Z. In the input connector 160, an input connector case 161 penetrates the second outer peripheral wall 76 so that an input facing surface 161b is exposed to the outside of the inverter housing 70. For example, the input connector case 161 penetrates the second width wall 76x in the depth direction Y. The input facing surface 161b extends in a direction perpendicular to the depth direction Y. The input connector 160 is provided on the opposite side of the filter component group 180G from the first wiring hole 85a. The input connector 160 is provided between one of the pair of second width walls 76x and the filter component group 180G in the depth direction Y.

[0130] At least a portion of the filter component group 180G is provided at a position aligned in the height direction Z with respect to the switching module 90, the second inverter module 110, and the second capacitor module 130. The multiple filter components 180 include filter components 180 aligned with the switching module 90 in the height direction Z, filter components 180 aligned with the second inverter module 110, and filter components 180 aligned with the second capacitor module 130. The filter components 180 aligned with the switching module 90 in the height direction Z include a filter coil component 181. The filter components 180 aligned with the second inverter module 110 in the height direction Z include a filter capacitor component 182.

[0131] The water channel 81 provides a cooling effect of the refrigerant to the second space 75a. In the second space 75a, the cooling effect of the refrigerant is provided to the filter components 180 and the like. At least one of the multiple filter components 180 is provided in a position aligned with the water channel 81 in the height direction Z. For example, the filter coil component 181 and the filter capacitor component 182 are positioned to overlap with the water channel 81 in the height direction Z.

[0132] The water passage 81 has a filter path 81e. The filter path 81e is a portion of the water passage 81 that overlaps the filter component 180. For example, the water passage 81 has a plurality of filter paths 81e. The plurality of filter paths 81e include a filter coil path 81e1 and a filter capacitor path 81e2. The filter coil path 81e1 is a portion that overlaps the filter coil component 181. The filter capacitor path 81e2 is a portion that overlaps the filter capacitor component 182. In the water passage 81, the plurality of filter paths 81e are arranged in the refrigerant flow direction. For example, the filter coil path 81e1 and the filter capacitor path 81e2 are arranged in the water passage 81 in the refrigerant flow direction.

[0133] The refrigerant flowing through the water passage 81 passes through one of the filter coil path 81e1 and the filter capacitor path 81e2 and then passes through the other. That is, the refrigerant reaches one of the filter coil component 181 and the filter capacitor component 182 in the water passage 81 and then reaches the other.

[0134] In the water channel 81, a first water channel opening 811 and a second water channel opening 812 are arranged side by side in the depth direction Y. The first water channel opening 811 is provided on one side of the pair of first width walls 72x, and the second water channel opening 812 is provided on the other side. For example, a first water channel connector 83 is provided on one of the pair of width walls 72x, 76x, and a second water channel connector 84 is provided on the other. Note that, in the water channel 81, the first water channel opening 811 and the second water channel opening 812 may be arranged side by side in the width direction X. Alternatively, the first water channel connector 83 may be provided on one of the pair of depth walls 72y, 76y, and the second water channel connector 84 may be provided on the other. Furthermore, the first water channel connector 83 may be provided on one of the width walls 72x, 76x and the depth walls 72y, 76y, and the second water channel connector 84 may be provided on the other.

[0135] 3 to 5, the multiple components housed in the inverter housing 70 include two components aligned in the height direction Z with the water channel 81 interposed therebetween. For example, at least a portion of the filter coil component 181 is disposed in a position aligned with the switching module 90 with the water channel 81 interposed therebetween. In the water channel 81, at least a portion of the filter coil path 81e1 overlaps with the switching path 81c. At least a portion of the filter capacitor component 182 is disposed in a position aligned with the second inverter module 110 with the water channel 81 interposed therebetween. In the water channel 81, at least a portion of the filter capacitor path 81e2 overlaps with the second inverter module 110.

[0136] <Configuration Group A> According to the present embodiment described so far, the first inverter module 100, the second inverter module 110, and the switching module 90 are each housed in the inverter housing 70 as independent components. This configuration increases the degree of freedom regarding the relative positional relationship between the first inverter module 100, the second inverter module 110, and the switching module 90 inside the inverter housing 70. This reduces the need to use a dedicated housing as the inverter housing 70 in accordance with the specifications of the first inverter module 100, the second inverter module 110, and the switching module 90. This increases the versatility of the inverter housing 70 in the motor unit 15 and the inverter device 30.

[0137] Assume that one of the multiple phases in either the first inverter circuit 40 or the second inverter circuit 50 becomes a short-circuited phase. A short-circuited phase is a phase in which both the upper arm switch and the lower arm switch are conductive. For example, assume that a short-circuited phase occurs in the second inverter circuit 50. In this case, a second circulating current Ic2 (see FIG. 1 ) may flow in the second inverter circuit 50 due to power stored in the second smoothing capacitor 32. The second circulating current Ic2 circulates from the second smoothing capacitor 32 through the second upper and lower arm circuit 51 of the short-circuited phase and returns to the second smoothing capacitor 32. Note that FIG. 1 illustrates a case in which the second upper and lower arm circuit 51 at the left end becomes a short-circuited phase.

[0138] In the inverter device 30, the longer the second circulating path through which the second circulating current Ic2 flows, the more likely the second circulating inductance increases. The second circulating inductance is an inductance such as a parasitic inductance that is parasitic on the second circulating path. In the second circulating path, the larger the second circulating inductance, the more likely it is that a surge voltage will occur due to a short circuit in the short-circuited phase. If a large surge voltage due to the second circulating current Ic2 is applied to the arm switches 52 and 53 of the short-circuited phase, there is a concern that an abnormality will occur in the arm switches 52 and 53.

[0139] When a short-circuit phase occurs in the second inverter circuit 50, a first circulating current Ic1 (see FIG. 1 ) may also flow on the first inverter circuit 40 side due to the power stored in the first smoothing capacitor 31. The first circulating current Ic1 flows in a circular manner from the first smoothing capacitor 31 through the second upper and lower arm circuit 51 of the short-circuit phase and back to the first smoothing capacitor 31. The first circulating current Ic1 is generated when the P switch 61 is in a conducting state, such as during open connection driving.

[0140] In the inverter device 30, the longer the first circulating path through which the first circulating current Ic1 flows, the more likely the first circulating inductance increases. The first circulating inductance is an inductance such as a parasitic inductance that is parasitic on the first circulating path. In the first circulating path, the greater the first circulating inductance, the more likely a surge voltage generated due to a short circuit in the short-circuited phase is to increase. If a large surge voltage due to the first circulating current Ic1 is applied to the arm switches 52 and 53 of the short-circuited phase, there is a concern that an abnormality will occur in the arm switches 52 and 53.

[0141] The first circulating path through which the first circulating current Ic1 flows includes the switching P line 12pc and the switching N line 12nc. Therefore, the longer the switching P line 12pc or the switching N line 12nc, the more likely the first circulating inductance is to increase, which raises concerns about the likelihood of an abnormality occurring in the second upper arm switch 52 or the second lower arm switch 53 due to a surge voltage.

[0142] Furthermore, when a short-circuit phase occurs in the first inverter circuit 40, the second circulating path through which the second circulating current Ic2 flows includes the switching P line 12pc and the switching N line 12nc. Therefore, the longer the switching P line 12pc or the switching N line 12nc, the more likely the second circulating inductance is to increase, which raises concerns that a surge voltage may more easily cause an abnormality in the first upper arm switch 42 or the first lower arm switch 43.

[0143] To address these concerns, according to this embodiment, at least a portion of the switching module 90 is arranged next to at least one of the inverter modules 100, 110 in the depth direction Y, which is perpendicular to the width direction X in which the inverter modules 100, 110 are arranged. In this configuration, three modules, namely, the first inverter module 100, the second inverter module 110, and the switching module 90, are arranged in a clustered state. This makes it possible to route the wiring members so that the paths electrically connecting the first inverter module 100, the second inverter module 110, and the switching module 90 are as short as possible. In other words, it is easy to route the switching P line 12pc and the switching N line 12nc as short as possible in the inverter housing 70.

[0144] If the switching P line 12pc and the switching N line 12nc are made as short as possible in this way, the first circulation path and the second circulation path can be made as short as possible even if a short-circuit phase occurs in the first inverter circuit 40 or the second inverter circuit 50. This makes it possible to minimize the first circulation inductance and the second circulation inductance, and to prevent a surge voltage from causing an abnormality in the arm switches 42, 43, 52, and 53 of the short-circuit phase. Therefore, by increasing the degree of freedom regarding the relative positional relationship between the first inverter module 100, the second inverter module 110, and the switching module 90, it is possible to prevent an abnormality from occurring in the inverter device 30.

[0145] According to this embodiment, the switching module 90 is disposed so as to span the first inverter module 100 and the second inverter module 110 in the width direction X. This configuration allows the switching module 90 to be disposed as close as possible to both the first inverter module 100 and the second inverter module 110. Furthermore, the P terminals 104, 114 and the N terminals 105, 115 of the inverter modules 100, 110 are disposed on the switching module 90 side. The P terminals 104, 114 and the N terminals 105, 115 are terminals to which wiring members forming the switching P line 12pc and the switching N line 12nc are connected. Therefore, the positions of the P terminals 104, 114 and the N terminals 105, 115 allow the switching P line 12pc and the switching N line 12nc to be as short as possible.

[0146] According to this embodiment, the water channel wall 82 is provided to separate the first space 71a and the second space 75a, and forms the water channel 81. In this configuration, the first space 71a and the second space 75a can be cooled and heat can be dissipated by the refrigerant flowing through the water channel 81. In other words, the cooling effect of the refrigerant can be imparted to the inverter modules 100, 110 and the switching module 90.

[0147] Furthermore, the inverter modules 100, 110 and the switching module 90 are all provided in the first space 71a. With this configuration, the wiring members connecting the first inverter module 100, the second inverter module 110, and the switching module 90 can be routed only in the first space 71a. This allows the wiring members forming the switching P line 12pc and the switching N line 12nc to be routed so as not to penetrate the water channel wall 82. For example, it is not necessary to route these wiring members through the water channel wall 82 at a position that avoids the water channel 81. Therefore, the wiring members can be routed in the first space 71a so as to keep the switching P line 12pc and the switching N line 12nc as short as possible.

[0148] According to this embodiment, two identical inverter components are housed in the inverter housing 70. One of the two inverter components is used as the first inverter module 100, and the other is used as the second inverter module 110. With this configuration, it is not necessary to set specifications, sizes, or shapes individually for the first inverter module 100 and the second inverter module 110. In this way, by increasing the versatility of the inverter modules 100 and 110, the versatility of the inverter device 30 can be increased.

[0149] According to this embodiment, the filter component group 180G housed in the inverter housing 70 includes a plurality of filter components 180 arranged in a group. This configuration allows the wiring members for electrically connecting the plurality of filter components 180 to be as short as possible. This prevents a decrease in the filtering effect of the filter circuit 33 due to an increase in the length of the P line 12p and the N line 12n connected to the filter circuit 33. Furthermore, this configuration reduces variation in the lengths of the P line 12p and the N line 12n relative to the filter circuit 33. This prevents a deterioration in noise, such as electromagnetic noise, in the filter circuit 33 due to variation in the lengths of the P line 12p and the N line 12n relative to the filter circuit 33.

[0150] According to this embodiment, the inverter modules 100 and 110 are provided in the first space 71a, while the filter component group 180G is provided in the second space 75a. This configuration prevents the presence of the inverter modules 100 and 110 from reducing the flexibility in arranging the multiple filter components 180 in the second space 75a. For example, it is possible to prevent the inverter modules 100 and 110 from being present in the filter component group 180G at a position where the filter component 180 should be arranged, preventing the filter component 180 from being arranged at that position. Therefore, in the filter component group 180G, the multiple filter components 180 can be arranged to facilitate the filtering function of the filter circuit 33. In other words, the arrangement of the filter components 180 can enhance the filtering function of the filter circuit 33.

[0151] According to this embodiment, the first inverter circuit 40 is connected to the first coil end 22 a, and the second inverter circuit 50 is connected to the second coil end 22 b. In this configuration, the motor 20 can be driven in multiple drive modes by driving the inverter circuits 40, 50 and the switching circuit 60. By allowing selection of multiple drive modes for the motor 20 in this way, the performance that can be exerted by the multi-phase motor coils 22 can be improved.

[0152] <Configuration Group B> According to this embodiment, the inverter modules 100, 110 and the switching module 90 can be cooled by the refrigerant flowing through the water channel 81. The inverter modules 100, 110 and the capacitor modules 120, 130 are provided in the first space 71a. This configuration allows wiring members, such as capacitor wiring 145, 146, that electrically connect the inverter modules 100, 110 and the capacitor modules 120, 130 to each other, to be routed without penetrating the water channel wall 82. In other words, there is no need to route these wiring members through the water channel wall 82 at a position that avoids the water channel 81 and makes a detour. This prevents the wiring members connecting the inverter modules 100, 110 and the capacitor modules 120, 130 from becoming longer and increasing inductance.

[0153] As described above, it is possible to prevent the performance of the inverter circuits 40, 50 from deteriorating due to an increase in temperature or inductance in the inverter modules 100, 110 and the capacitor modules 120, 130. Therefore, it is possible to realize a configuration in the motor unit 15 and the inverter device 30 that allows the inverter circuits 40, 50 to easily exhibit their full performance.

[0154] According to this embodiment, the first inverter module 100 and the first capacitor module 120 are arranged adjacent to each other in the depth direction Y along the water channel wall 82. In this configuration, the first inverter module 100 and the first capacitor module 120 are arranged as close as possible to each other without the water channel wall 82 in between. This allows the wiring members, such as the first capacitor wiring 145 that electrically connects the first inverter module 100 and the first capacitor module 120, to be as short as possible. Therefore, even if a short-circuit phase occurs in the inverter circuits 40, 50, it is possible to shorten the first circulation path as much as possible and reduce the first circulation inductance.

[0155] Furthermore, the second inverter module 110 and the second capacitor module 130 are arranged adjacent to each other along the water channel wall 82. In this configuration, the second inverter module 110 and the second capacitor module 130 are arranged as close as possible without the water channel wall 82 in between. This allows wiring members such as the second capacitor wiring 146 that electrically connects the second inverter module 110 and the second capacitor module 130 to be as short as possible. Therefore, even if a short-circuit phase occurs in the inverter circuits 40, 50, it is possible to shorten the second circulation path as much as possible and reduce the second circulation inductance.

[0156] In the inverter device 30, even if a surge voltage occurs due to switching in the first inverter circuit 40, the surge voltage is reduced by the first smoothing capacitor 31. However, if the current path connecting the first inverter circuit 40 and the first smoothing capacitor 31 is long, the inductance of the current path increases, and the surge voltage reduction effect of the first smoothing capacitor 31 is likely to be reduced. In contrast, according to this embodiment, the first inverter module 100 and the first capacitor module 120 are located adjacent to each other, so the current path connecting the first inverter circuit 40 and the first smoothing capacitor 31 can be made as short as possible. This reduces the inductance of the current path, and therefore the surge voltage reduction effect of the first smoothing capacitor 31 is likely to be enhanced. Therefore, it is possible to prevent the performance of the first inverter circuit 40 from being reduced by the surge voltage.

[0157] Furthermore, in the inverter device 30, even if a surge voltage occurs due to switching in the second inverter circuit 50, the surge voltage is reduced by the second smoothing capacitor 32. However, if the current path connecting the second inverter circuit 50 and the second smoothing capacitor 32 is long, the inductance of the current path increases, and the surge voltage reduction effect of the second smoothing capacitor 32 is likely to be reduced. In contrast, according to this embodiment, the second inverter module 110 and the second capacitor module 130 are located adjacent to each other, so the current path connecting the second inverter circuit 50 and the second smoothing capacitor 32 can be made as short as possible. This reduces the inductance of the current path, and therefore the surge voltage reduction effect of the second smoothing capacitor 32 is likely to be enhanced. Therefore, it is possible to prevent the performance of the second inverter circuit 50 from being reduced by the surge voltage.

[0158] In the inverter device 30, if the lengths of the current path connecting the first inverter circuit 40 and the first smoothing capacitor 31 and the current path connecting the second inverter circuit 50 and the second smoothing capacitor 32 are different, a difference in inductance is likely to occur between these current paths. This difference in inductance results in a difference in surge voltage reduction effect, and a difference in performance between the first inverter circuit 40 and the second inverter circuit 50 is likely to occur. In this case, the inverter circuit that can deliver lower performance, either the first inverter circuit 40 or the second inverter circuit 50, may reduce the performance of the motor 20. For example, if the performance that the first inverter circuit 40 can deliver is lower than the performance that the second inverter circuit 50 can deliver, the motor 20 may be driven in accordance with the performance of the first inverter circuit 40.

[0159] In contrast, according to this embodiment, the first inverter module 100 and the first capacitor module 120 are disposed adjacent to each other, and the second inverter module 110 and the second capacitor module 130 are disposed adjacent to each other. With this configuration, the wiring members can be arranged so that the difference in length between the current path connecting the first inverter circuit 40 and the first smoothing capacitor 31 and the current path connecting the second inverter circuit 50 and the second smoothing capacitor 32 is minimized. This prevents a difference in the surge voltage reduction effect between the first inverter circuit 40 and the second inverter circuit 50, which could result in the inverter circuit with lower performance reducing the performance of the motor 20.

[0160] According to this embodiment, the first inverter module 100 and the second inverter module 110 are arranged adjacent to each other along the water channel wall 82. In this configuration, the first inverter module 100 and the second inverter module 110 are arranged as close as possible without the water channel wall 82 in between. This allows the wiring members connecting the first inverter module 100 and the second inverter module 110 to be as short as possible. In other words, the wiring members forming the switching P line 12pc and the switching N line 12nc can be as short as possible. Therefore, even if a short-circuit phase occurs in the inverter circuits 40 and 50, the short lengths of the switching P line 12pc and the switching N line 12nc make it possible to reduce the first circulating inductance and the second circulating inductance.

[0161] In the drive system 10, the first smoothing capacitor 31 and the second smoothing capacitor 32 are electrically connected via inverter circuits 40 and 50. In this configuration, the current flowing through each of the first smoothing capacitor 31 and the second smoothing capacitor 32 may pulsate due to ripple current or the like. If the current flowing through the first smoothing capacitor 31 and the current flowing through the second smoothing capacitor 32 resonates, there is a concern that the current flowing through the smoothing capacitors 31 and 32 may become too large. An example of a case in which the current flowing through the smoothing capacitors 31 and 32 becomes too large is when this current exceeds the rated current value of the smoothing capacitors 31 and 32. If the current flowing through the smoothing capacitors 31 and 32 becomes too large, it is considered that abnormalities may easily occur in the smoothing capacitors 31 and 32.

[0162] In the drive system 10, if the capacitor path that electrically connects the first smoothing capacitor 31 and the second smoothing capacitor 32 is long, the inductance of the capacitor path is likely to increase. The inductance of the capacitor path is, for example, a parasitic inductance that is parasitic on the capacitor path. If the inductance of the capacitor path is large, the current flowing through the first smoothing capacitor 31 and the current flowing through the second smoothing capacitor 32 are likely to resonate.

[0163] In contrast, according to this embodiment, the first capacitor module 120 and the second capacitor module 130 are arranged adjacent to each other along the water channel wall 82. In this configuration, the first capacitor module 120 and the second capacitor module 130 are arranged as close as possible without the water channel wall 82 in between. This allows the wiring members connecting the first capacitor module 120 and the second capacitor module 130 to be as short as possible. In other words, the capacitor path can be made as short as possible. By making the capacitor path as short as possible in this way, the inductance of the capacitor path is reduced, making it possible to prevent resonance between the current flowing through the first smoothing capacitor 31 and the current flowing through the second smoothing capacitor 32. This makes it possible to prevent the current flowing through the smoothing capacitors 31 and 32 from becoming too large due to current resonance.

[0164] Furthermore, by shortening the wiring members connecting the inverter modules 100 and 110 and the wiring members connecting the capacitor modules 120 and 130, it is possible to reduce the heat generated by these wiring members, thereby preventing the performance of the inverter circuits 40 and 50 from being reduced due to the heat generated by the wiring members.

[0165] According to this embodiment, the water channel 81 is provided so that the refrigerant reaches one of the first inverter module 100 and the second inverter module 110 before reaching the other. With this configuration, in order to cool the inverter modules 100, 110 with the refrigerant, it is not necessary to form a branching portion where the refrigerant branches or a confluence portion where the refrigerant flows in the water channel 81. This prevents the refrigerant from flowing easily through the water channel 81, which would reduce the cooling effect of the refrigerant on the inverter modules 100, 110.

[0166] According to this embodiment, the switching module 90 is provided in the first space 71a together with the inverter modules 100, 110 and the capacitor modules 120, 130. In this configuration, the positional relationship between the switching module 90 and the inverter modules 100, 110 can be set so that the switching P line 12pc is as short as possible. This allows the wiring connecting the inverter modules 100, 110 and the wiring connecting the capacitor modules 120, 130 to be as short as possible. This makes it possible to reduce circulating inductance when a short-circuited phase occurs and suppress current resonance in the smoothing capacitors 31, 32.

[0167] Furthermore, with this configuration, it is possible to wire the wiring members connecting the switching module 90 to the inverter modules 100, 110 and the capacitor modules 120, 130 so that they do not penetrate the water channel wall 82. For example, there is no need to route the wiring members extending from the switching module 90 so as to penetrate the water channel wall 82 at a position that avoids the water channel 81. Therefore, the wiring members connecting the switching module 90 to the inverter modules 100, 110 and the capacitor modules 120, 130 can be made as short as possible.

[0168] According to this embodiment, the water channel 81 is provided so that the refrigerant reaches the first inverter module 100, the second inverter module 110, and the switching module 90 one by one in order. With this configuration, when the refrigerant cools the inverter modules 100, 110, and the switching module 90, it is not necessary to form branching portions where the refrigerant branches or merging portions where the refrigerant joins in the water channel 81. This prevents the refrigerant from flowing easily through the water channel 81, thereby preventing a decrease in the cooling effect of the refrigerant on the inverter modules 100, 110, and the switching module 90.

[0169] According to this embodiment, the inverter modules 100, 110 and the capacitor modules 120, 130 are provided in the first space 71a, while the filter component group 180G is provided in the second space 75a. This configuration prevents the presence of the inverter modules 100, 110 and the capacitor modules 120, 130 from reducing the degree of freedom in arranging the multiple filter components 180 in the second space 75a. For example, it is possible to prevent a situation in which the capacitor modules 120, 130 are present in a position where the filter component 180 should be arranged, making it impossible to arrange the filter component 180 at that position in the filter component group 180G.

[0170] According to this embodiment, at least one of the filter coil component 181 and the filter capacitor component 182 is disposed in a position overlapping the water passage 81. With this configuration, the cooling effect of the refrigerant can be imparted to the filter coil component 181 and the filter capacitor component 182. This prevents the temperature of the filter coil component 181 and the filter capacitor component 182 from rising and deteriorating the filtering function of the filter circuit 33.

[0171] <Configuration Group D> According to this embodiment, at least a portion of the output connector 150 is arranged in a position aligned with at least one of the first inverter module 100 and the second inverter module 110 in the depth direction Y. In this configuration, the output connector 150 can be positioned so that the difference in length between the first output line 12oa and the second output line 12ob is minimized. For example, the difference in length between the wiring member connecting the output connector 150 to the first inverter module 100 and the wiring member connecting the output connector 150 to the second inverter module 110 can be minimized. This prevents the difference in length between the first output line 12oa and the second output line 12ob from increasing, thereby preventing the difference in inductance between the first inverter circuit 40 and the second inverter circuit 50 from increasing. This prevents the first inverter circuit 40 or the second inverter circuit 50, which has the larger inductance, from failing to properly demonstrate its performance. This makes it possible to realize a configuration in which the first inverter circuit 40 and the second inverter circuit 50 can easily exhibit their respective performances.

[0172] The inductance relative to the first inverter circuit 40 includes the inductance of the first output line 12oa. The inductance of the first output line 12oa includes the parasitic inductance that is parasitic on the first output line 12oa. In the inverter device 30, the greater the inductance of the first output line 12oa, the more likely the performance that the first inverter circuit 40 can exhibit is to decline. That is, the longer the wiring member that forms the first output line 12oa, the more likely the performance that the first inverter circuit 40 can exhibit is to decline. The inductance of the second output line 12ob includes the parasitic inductance that is parasitic on the second output line 12ob. In the inverter device 30, the greater the inductance of the second output line 12ob, the more likely the performance that the second inverter circuit 50 can exhibit is to decline. That is, the longer the wiring member that forms the second output line 12ob, the more likely the performance that the second inverter circuit 50 can exhibit is to decline.

[0173] In this embodiment, at least a portion of the output connector 150 is positioned next to at least one of the inverter modules 100, 110 in the depth direction Y, which allows the wiring members to be routed so that the output lines 12oa, 12ob are as short as possible. In this configuration, the inductance to the inverter circuits 40, 50 is easily reduced, thereby improving the performance that the inverter circuits 40, 50 can exhibit.

[0174] According to this embodiment, the output connector 150 is provided adjacent to each of the first inverter module 100 and the second inverter module 110. In this configuration, the output connector 150 can be disposed as close as possible to both the first inverter module 100 and the second inverter module 110. This allows the length of the wiring member connecting the output connector 150 to the first inverter module 100 and the length of the wiring member connecting the output connector 150 to the second inverter module 110 to be shortened as much as possible. This allows the first output line 12oa and the second output line 12ob to be shortened as much as possible.

[0175] According to this embodiment, the first inverter module 100 and the second inverter module 110 are arranged along the output board surface 151a. In this configuration, the multiple output connector terminals 152 of the output connector 150 are arranged along the output board surface 151a, and are therefore arranged in the width direction X, which is the arrangement direction of the inverter modules 100, 110. This prevents the distance between the output connector terminals 152 and the inverter modules 100, 110 from differing significantly among the multiple output connector terminals 152. This minimizes the difference in length between the wiring member connecting the output connector 150 to the first inverter module 100 and the wiring member connecting the output connector 150 to the second inverter module 110.

[0176] According to this embodiment, the first connector terminal 152a and the second connector terminal 152b are aligned in the width direction X, in which the first inverter module 100 and the second inverter module 110 are aligned. With this configuration, in the output connector 150, the first connector terminal 152a connected to the first inverter module 100 can be easily positioned close to the first inverter module 100. Furthermore, the second connector terminal 152b connected to the second inverter module 110 can be easily positioned close to the second inverter module 110. This minimizes the difference in length between the wiring member connecting the first connector terminal 152a to the first inverter module 100 and the wiring member connecting the second connector terminal 152b to the second inverter module 110. Therefore, the positional relationship between the first connector terminal 152a and the second connector terminal 152b minimizes the difference in length between the first output line 12oa and the second output line 12ob.

[0177] According to this embodiment, in the inverter modules 100, 110, the output terminals 106, 116 are provided between the switch protectors 103, 113 and the output connector 150 in the depth direction Y. With this configuration, the output terminals 106, 116 can be disposed as close as possible to the output connector 150. This allows the wiring connecting the output terminals 106, 116 and the output connector 150 to be as short as possible. Furthermore, with this configuration, both the first output terminal 106 and the second output terminal 116 can be disposed as close as possible to the output connector 150. This allows the difference in length between the wiring connecting the first output terminal 106 and the output connector 150 and the wiring connecting the second output terminal 116 and the output connector 150 to be as small as possible.

[0178] According to this embodiment, the output connector 150 is provided so as to span the first inverter module 100 and the second inverter module 110 in the width direction X. This configuration makes it possible to both arrange the first connector terminal 152a as close as possible to the first inverter module 100 and arrange the second connector terminal 152b as close as possible to the second inverter module 110.

[0179] According to this embodiment, the output connector 150 and the inverter modules 100, 110 are arranged along the water channel wall 82. This configuration makes it possible to easily impart the cooling effect of the refrigerant flowing through the water channel 81 to the output connector 150 and the inverter modules 100, 110. This configuration also makes it possible to easily impart the cooling effect of the refrigerant to the wiring members connecting the output connector 150 and the inverter modules 100, 110.

[0180] According to this embodiment, the output connector 150 is provided in the first space 71a together with the inverter modules 100, 110. In this configuration, the wiring members connecting the output connector 150 and the inverter modules 100, 110 can be laid out so as not to penetrate the water channel wall 82. Therefore, the wiring members can be laid out so that the first output line 12oa and the second output line 12ob are as short as possible.

[0181] According to this embodiment, the output connector 150 is provided on the opposite side of the inverter modules 100, 110 from the capacitor modules 120, 130 in the depth direction Y. In this configuration, there is no need to route the wiring members connecting the output connector 150 and the inverter modules 100, 110 in a detour around the capacitor modules 120, 130. Therefore, depending on the positional relationship between the output connector 150 and the capacitor modules 120, 130, the wiring members can be routed so that the first output line 12oa and the second output line 12ob are as short as possible.

[0182] Second Embodiment In the first embodiment, the first inverter module 100 and the second inverter module 110 are arranged in the width direction X. In contrast, in the second embodiment, the first inverter module 100 and the second inverter module 110 are arranged in the depth direction Y. Configurations, actions, and effects not specifically described in the second embodiment are the same as those in the first embodiment. The second embodiment will be described mainly focusing on differences from the first embodiment.

[0183] 6 and 8 , the first inverter module 100 and the second inverter module 110 are arranged adjacent to each other in the depth direction Y. The first capacitor module 120 and the second capacitor module 130 are arranged adjacent to each other in the depth direction Y. The first inverter module 100 and the first capacitor module 120 are arranged adjacent to each other in the width direction X. The second inverter module 110 and the second capacitor module 130 are arranged adjacent to each other in the width direction X.

[0184] The switching module 90 and the first capacitor module 120 are arranged adjacent to each other in the width direction X. The switching module 90 is provided on the opposite side of the inverter modules 100 and 110 in the width direction X, across the capacitor modules 120 and 130. The switching module 90 is provided adjacent to the first capacitor module 120. The first capacitor module 120 is provided between the first inverter module 100 and the switching module 90.

[0185] The output connector 150 is provided on the opposite side of one of the first inverter module 100 and the second inverter module 110 in the depth direction Y. For example, the output connector 150 is provided on the opposite side of the second inverter module 110 across the first inverter module 100. In this embodiment, the depth direction Y corresponds to the arrangement direction of the inverter modules 100, 110, and the width direction X corresponds to the orthogonal direction.

[0186] At least a portion of the output connector 150 is provided on both the first inverter module 100 and the second inverter module 110 in a position aligned in the depth direction Y. The output connector 150 protrudes from the inverter modules 100, 110 to one side in the width direction X. For example, the output connector 150 protrudes from the inverter modules 100, 110 toward the first depth wall 72y. The output connector 150 is provided at a position spaced apart from the capacitor modules 120, 130 in the width direction X. The output connector 150 is also provided at a position spaced apart from the switching module 90 in the width direction X.

[0187] The inverter modules 100, 110 are arranged such that the P terminals 104, 114 and N terminals 105, 115 and the output terminals 106, 116 are aligned in the width direction X. The P terminals 104, 114 and N terminals 105, 115 are located between the switch protectors 103, 113 and the capacitor modules 120, 130 in the width direction X. The output terminals 106, 116 are located between the switch protectors 103, 113 and the first depth wall 72y in the width direction X. The output terminals 106, 116 are aligned in the depth direction Y along the first depth wall 72y. The output connector 150 is located in a position aligned with the output terminals 106, 116 in the depth direction Y.

[0188] The switching module 90 is provided so that the first switching P terminal 94 and the second switching P terminal 95 are aligned in the depth direction Y.

[0189] 7 and 8 , the filter component group 180G is arranged so as to span the first inverter module 100 and the second inverter module 110 in the depth direction Y. The plurality of filter components 180 are arranged in the depth direction Y, along with the first inverter module 100 and the second inverter module 110. The plurality of filter components 180 include filter components 180 arranged on the first inverter module 100 in the height direction Z and filter components 180 arranged on the second inverter module 110. The filter components 180 arranged on the first inverter module 100 in the height direction Z include a filter capacitor component 182. The filter components 180 arranged on the second inverter module 110 in the height direction Z include a filter coil component 181.

[0190] In addition to the inverter paths 81a and 81b and the switching path 81c, the water path 81 has a first capacitor path 81f and an output wiring path 81h. The first capacitor path 81f is a portion of the water path 81 that overlaps with the first capacitor module 120. In the first capacitor path 81f, the cooling effect of the refrigerant is likely to be imparted to the first capacitor module 120. The output wiring path 81h is a portion of the water path 81 that overlaps with the output wiring 143, 144. In the output wiring path 81h, the cooling effect of the refrigerant is likely to be imparted to the output wiring 143, 144.

[0191] <Configuration Group A> According to this embodiment, the filter component group 180G is provided so as to span the first inverter module 100 and the second inverter module 110 in the depth direction Y. With this configuration, a space large enough to accommodate the first inverter module 100 and the second inverter module 110 can be secured as the installation space for the filter component group 180G. This prevents a situation in which the installation space for the filter component group 180G is insufficient and the multiple filter components 180 cannot be arranged to provide the filtering function of the filter circuit 33.

[0192] <Configuration Group E> According to this embodiment, the output connector 150 is provided on the opposite side of one of the first inverter module 100 and the second inverter module 110 in the depth direction Y. In this configuration, the output connector 150 can be positioned so that the path to the motor coil 22 of the inverter module 100 or the second inverter module 110, whichever is more likely to experience performance degradation due to heat generation or the like, is shortened. This prevents the performance of the inverter module 100, 110, which is more likely to experience performance degradation due to increased inductance to the motor coil 22 or heat generation. This makes it possible to realize a configuration that allows the first inverter module 100 and the second inverter module 110 to easily exhibit their performance.

[0193] The inductance of the output line 12o is an example of the inductance with respect to the motor coil 22. The larger the inductance of the output line 12o, the larger the inductance with respect to the motor coil 22 tends to be.

[0194] The heat generated in the motor coil 22 includes heat generated in the output line 12o. In the inverter device 30, the greater the heat generated in the first output line 12oa, the more likely it is that the performance that the first inverter circuit 40 can exert on the motor 20 will decrease. The longer the wiring members forming the first output line 12oa, the more likely it is that heat will be generated in the first output line 12oa. Furthermore, the greater the heat generated in the second output line 12ob, the more likely it is that the performance that the second inverter circuit 50 can exert on the motor 20 will decrease. The longer the wiring members forming the second output line 12ob, the more likely it is that heat will be generated in the second output line 12ob.

[0195] In this embodiment, the output connector 150 is provided on the opposite side of the first inverter module 100 from the second inverter module 110. In this configuration, the wiring connecting the output connector 150 and the first inverter module 100 can be made as short as possible, which prevents the inductance of the wiring from degrading the performance of the first inverter circuit 40. Therefore, it is possible to prevent an increase in the difference between the performance that the first inverter circuit 40 and the second inverter circuit 50 can achieve.

[0196] In the inverter device 30, it is conceivable that a difference in performance can be exhibited between the first inverter circuit 40 and the second inverter circuit 50 depending on the driving state of the motor 20. For example, when the driving state of the motor 20 is star-connected driving, the performance of the first inverter circuit 40 may be reduced due to heat generation by the first inverter module 100, and the first inverter circuit 40 may reduce the performance of the motor 20.

[0197] In contrast, according to this embodiment, the output connector 150 is provided in a position close to the first inverter module 100. In this configuration, by making the wiring members as short as possible, it is possible to prevent the performance of the first inverter circuit 40 from being reduced due to the inductance of the wiring members connecting the output connector 150 and the first inverter module 100. Therefore, even if the performance that the first inverter circuit 40 can exhibit is reduced due to star-connection driving or the like, it is possible to improve the state in which the first inverter circuit 40 reduces the performance of the motor 20.

[0198] According to this embodiment, at least a portion of the output connector 150 is provided on both the first inverter module 100 and the second inverter module 110 at positions aligned in the depth direction Y. In this configuration, the output connector 150 can be disposed as close as possible to one of the inverter modules 100, 110. Therefore, by disposing the output connector 150 on the side of the inverter module 100, 110 whose performance is more likely to deteriorate, the wiring member connecting that inverter module and the output connector 150 can be made as short as possible.

[0199] According to this embodiment, the output connector 150 has an output plate surface 151a extending in a direction perpendicular to the depth direction Y. In this configuration, the orientation of the output plate surface 151a makes it possible to minimize the space in the depth direction Y in which the output connector 150 and the inverter modules 100, 110 are installed. This allows the dimensions of the inverter housing 70 in the depth direction Y to be reduced.

[0200] According to this embodiment, the output connector 150 has the first connector terminals 152 a and the second connector terminals 152 b arranged in the width direction X. In this configuration, the arrangement of the first connector terminals 152 a and the second connector terminals 152 b can minimize the space in the depth direction Y in which the output connector 150 and the inverter modules 100, 110 are installed.

[0201] According to this embodiment, in the first inverter module 100, a plurality of first output terminals 106 are arranged in the depth direction Y. In the second inverter module 110, a plurality of second output terminals 116 are arranged in the depth direction Y. With this configuration, the plurality of first output terminals 106 and the plurality of second output terminals 116 can be arranged at positions separated from each other in the depth direction Y. Therefore, even if heat is generated from the first output terminals 106 or the second output terminals 116, the heat is unlikely to accumulate in the space where the first output terminals 106 or the second output terminals 116 are installed. Therefore, it is possible to prevent the performance of the inverter modules 100, 110 from being reduced due to the heat from the first output terminals 106 or the second output terminals 116.

[0202] Third Embodiment In the first embodiment, the inverter modules 100, 110 and the capacitor modules 120, 130 are provided in one of the first space 71a and the second space 75a. In contrast, in the third embodiment, the first inverter module 100 is provided in one of the first space 71a and the second space 75a, and the second capacitor module 130 is provided in the other. Configurations, actions, and effects not specifically described in the third embodiment are the same as those in the first embodiment. The third embodiment will be described mainly focusing on differences from the first embodiment.

[0203] As shown in Figures 9 and 10, a first inverter module 100 is provided in the first space 71a, and a second capacitor module 130 is provided in the second space 75a. As shown in Figure 9, the first inverter module 100 and the first capacitor module 120 are provided in the first space 71a. The first inverter module 100 and the first capacitor module 120 are arranged adjacent to each other along the first water channel wall surface 82a. The first inverter module 100 and the first capacitor module 120 are provided at positions closer to one of the pair of first depth walls 72y than the other. The first inverter module 100 and the first capacitor module 120 are arranged along one of the first depth walls 72y.

[0204] The switching module 90 is arranged next to the first inverter module 100 in the width direction X. The switching module 90 and the first inverter module 100 are arranged next to each other along the first width wall 72x. The switching module 90 is provided at a position close to the first depth wall 72y opposite the first inverter module 100, of the pair of first depth walls 72y. As in the second embodiment, the switching module 90 is provided with the first switching P terminal 94 and the second switching P terminal 95 aligned in the depth direction Y.

[0205] 9 and 11 , the control board 174 is placed on top of the switching drive board 173. At least a portion of the control board 174 is aligned with the switching drive board 173 in the height direction Z. For example, the control board 174 covers the entire switching drive board 173 from the opposite side of the water channel wall 82 in the height direction Z. The control board 174 is provided on the opposite side of the water channel wall 82 in the height direction Z, across from the switching module 90 and the switching drive board 173.

[0206] The output connector 150 is arranged next to the first inverter module 100 and the first capacitor module 120 in the depth direction Y. The output connector 150 is provided on the opposite side of the first inverter module 100 from the first capacitor module 120. The output connector 150, the first inverter module 100, and the first capacitor module 120 are arranged next to each other along the first depth wall 72y.

[0207] 10 , a second inverter module 110 and a second capacitor module 130 are provided in the second space 75a. The second inverter module 110 and the second capacitor module 130 are arranged adjacent to each other along the second water channel wall surface 82b in the depth direction Y. The second inverter module 110 and the second capacitor module 130 are arranged along the second depth wall 76y.

[0208] 9, 10, and 11, the first inverter module 100 and the second inverter module 110 are arranged side by side in the height direction Z with the water channel wall 82 interposed therebetween. The first inverter module 100 and the second inverter module 110 are stacked on top of each other with the water channel wall 82 interposed therebetween. The first capacitor module 120 and the second capacitor module 130 are arranged side by side in the height direction Z with the water channel wall 82 interposed therebetween. The first capacitor module 120 and the second capacitor module 130 are stacked on top of each other with the water channel wall 82 interposed therebetween.

[0209] In the first inverter module 100 and the second inverter module 110, the P terminals 104, 114, the N terminals 105, 115, and the output terminals 106, 116 are aligned in the same direction. For example, the P terminals 104, 114, the N terminals 105, 115, and the output terminals 106, 116 are aligned in the depth direction Y. The area in the first inverter module 100 where the first P terminal 104 and the first N terminal 105 are located and the area in the second inverter module 110 where the second P terminal 114 and the second N terminal 115 are located are aligned in the height direction Z with the channel wall 82 interposed therebetween. Furthermore, the area in the first inverter module 100 where the multiple first output terminals 106 are located and the area in the second inverter module 110 where the multiple second output terminals 116 are located are aligned in the height direction Z with the channel wall 82 interposed therebetween.

[0210] The output connector 150 extends in the height direction Z in which the first inverter module 100 and the second inverter module 110 are aligned. At least a portion of the output connector 150 is aligned with the first inverter module 100. The output connector 150 is provided at a position shifted toward the first inverter module 100 from the second inverter module 110 in the height direction Z. In this embodiment, the height direction Z corresponds to the alignment direction of the inverter modules 100, 110, and the depth direction Y corresponds to the orthogonal direction.

[0211] As shown in Figures 9 and 10, the water channel wall 82 is provided with a second wiring hole 85b, a third wiring hole 85c, and a fourth wiring hole 85d as water channel wall holes 85. The wiring holes 85b to 85d are holes for inserting wiring members. The second wiring hole 85b is inserted with a wiring member forming the output line 12o. For example, the second output wiring 144 is inserted through the second wiring hole 85b. The second output wiring 144 is inserted through the second wiring hole 85b and is wired so as to span between the second connector terminal 152b and the second output terminal 116.

[0212] The third wiring hole 85c is inserted with wiring members forming the P line 12p, wiring members forming the N line 12n, wiring members forming the output line 12o, etc. For example, the third wiring hole 85c is inserted with wiring members connecting the first inverter module 100 and the second inverter module 110 via the switching module 90. The wiring members inserted into the third wiring hole 85c include wiring members connecting the first capacitor module 120 and the second capacitor module 130. The third wiring hole 85c is located at a position where the wiring members connecting the first inverter module 100 and the second inverter module 110 and the wiring members connecting the first capacitor module 120 and the second capacitor module 130 can be made as short as possible.

[0213] A wiring member used for communication is inserted through the fourth wiring hole 85d. For example, a wiring member that connects the control board 174 and the second drive board 172 so that they can communicate with each other is inserted through the fourth wiring hole 85d.

[0214] 9 and 11 , the filter component 180 is housed in the first space 71a. A plurality of the filter components 180 are arranged along the first water passage wall surface 82a. For example, the plurality of filter components 180 are arranged as a whole in the width direction X and the depth direction Y along the first width wall 72x and the first depth wall 72y. The filter component group 180G extends as a whole along the first outer peripheral wall 72.

[0215] The input connector 160 is accommodated in the first space 71a. The input connector 160 is provided on the opposite side of the output connector 150 in the depth direction Y, across the first inverter module 100 and the first capacitor module 120. The input connector 160 is arranged next to the filter component group 180G in the width direction X. The input connector 160 penetrates the first depth wall 72y in the width direction X.

[0216] In the water channel 81, at least a portion of the first inverter path 81a overlaps with the second inverter path 81b. In the water channel 81, the portion between the first inverter module 100 and the second inverter module 110 in the height direction Z is included in both the first inverter path 81a and the second inverter path 81b.

[0217] <Configuration Group A> According to this embodiment, the first inverter module 100 and the switching module 90 are provided in the first space 71a, and the second inverter module 110 is provided in the second space 75a. With this configuration, the heat from the three components, i.e., the inverter modules 100, 110, and the switching module 90, is not released to only one of the first space 71a and the second space 75a. This prevents the cooling effect of the refrigerant from being insufficient in only one of the first space 71a and the second space 75a.

[0218] <Configuration group C> According to this embodiment, since there is a water channel 81 between the first space 71a and the second space 75a, the cooling effect of the refrigerant can be imparted to both the first inverter module 100 in the first space 71a and the second inverter module 110 in the second space 75a.

[0219] Moreover, the first space 71a is provided with the first inverter module 100 and the first capacitor module 120. Therefore, in the first space 71a, the first inverter module 100 and the first capacitor module 120 can be arranged so that the wiring connecting them is as short as possible. Furthermore, in the second space 75a, the second inverter module 110 and the second capacitor module 130 can be arranged so that the wiring connecting them is as short as possible. Therefore, it is possible to prevent the wiring from becoming long and increasing inductance for both the first inverter circuit 40 and the second inverter circuit 50.

[0220] As described above, it is possible to prevent the performance of both the first inverter circuit 40 and the second inverter circuit 50 from being reduced due to an increase in temperature or inductance.

[0221] In this embodiment, four relatively heavy components, namely, the inverter modules 100, 110 and the capacitor modules 120, 130, are provided in pairs in each of the first and second spaces 71a and 75a. In this configuration, both of the two components in each of the first and second spaces 71a and 75a can be disposed in relatively strong portions of the inverter housing 70. Examples of relatively strong portions of the inverter housing 70 include positions close to the first outer peripheral wall 72 and the second outer peripheral wall 76 in a plan view.

[0222] For example, when the inverter housing 70 vibrates in the height direction Z, the outer peripheral walls 72, 76 are less likely to vibrate in the height direction Z than the water channel wall 82. In the water channel wall 82, the closer the parts are to the outer peripheral walls 72, 76, the less likely they are to vibrate in the height direction Z. Therefore, by arranging two components close to the outer peripheral walls 72, 76 in each of the first space 71a and the second space 75a, it is possible to realize a configuration in which these components are less likely to vibrate in the height direction Z. Furthermore, with two components, it is relatively easy to arrange these components as close as possible to each other in a plan view so that the wiring connecting these components is as short as possible.

[0223] For example, consider a configuration in which four components are provided only in the first space 71a, unlike the present embodiment. In this configuration, to arrange the four components in the first space 71a in a relatively strong portion of the inverter housing 70, for example, each of the four components may be arranged close to the first outer peripheral wall 72 in a plan view. However, arranging each of the four components close to the first outer peripheral wall 72 tends to increase the distance between the four components. In this case, there is a concern that the wiring connecting the four components will become longer, which may reduce the performance of the inverter module 100, 110 due to increased inductance, etc.

[0224] In contrast, in this embodiment, two relatively heavy components are provided in each of the first and second spaces 71a and 75a, making it easier to shorten the wiring connecting the two components, thereby reducing the inductance of the wiring and improving the performance of the inverter modules 100 and 110.

[0225] According to this embodiment, the first inverter module 100 and the second inverter module 110 are provided at positions overlapping the water channel 81. In this configuration, the cooling effect of the refrigerant flowing through the water channel 81 can be easily imparted to both the first inverter module 100 and the second inverter module 110.

[0226] According to this embodiment, the first capacitor module 120 is arranged next to the first inverter module 100 in the first space 71a along the water channel wall 82. In this configuration, the wiring members connecting the first inverter module 100 and the first capacitor module 120 can be routed so as not to penetrate the water channel wall 82. This minimizes the inductance of the wiring members, thereby preventing the surge voltage reduction effect of the first capacitor module 120 on the first inverter module 100 from being reduced by the inductance.

[0227] The second inverter module 110 is arranged next to the second capacitor module 130 in the second space 75a along the water channel wall 82. In this configuration, the wiring members connecting the second inverter module 110 and the second capacitor module 130 can be routed so as not to penetrate the water channel wall 82. This minimizes the inductance of the wiring members, thereby preventing the surge voltage reduction effect of the second capacitor module 130 on the second inverter module 110 from being reduced by the inductance.

[0228] According to this embodiment, the first capacitor module 120 is arranged next to the second capacitor module 130 via the water channel wall 82. In this configuration, the two components, the first capacitor module 120 and the second capacitor module 130, can be fixed together to a relatively strong portion of the inverter housing 70. This makes it easy to realize a configuration in which each of the two components, the capacitor modules 120 and 130, is less susceptible to vibration.

[0229] Furthermore, the second inverter module 110 is arranged next to the first inverter module 100 via the water channel wall 82. In this configuration, the two components, the first inverter module 100 and the second inverter module 110, can be fixed together in a relatively strong portion of the inverter housing 70. This makes it easy to realize a configuration in which each of the two components, the inverter modules 100 and 110, is less susceptible to vibration.

[0230] According to this embodiment, at least a portion of the water channel 81 is provided between the first inverter module 100 and the second inverter module 110. In this configuration, even if the first inverter module 100 and the second inverter module 110 are arranged side by side in the height direction Z, the cooling effect of the refrigerant flowing through the water channel 81 is easily imparted to both the inverter modules 100 and 110. Furthermore, in this configuration, the cooling effect of the refrigerant is easily imparted to both the first inverter module 100 and the second inverter module 110 simultaneously. Therefore, it is possible to prevent a difference in the cooling effect of the refrigerant between the first inverter module 100 and the second inverter module 110.

[0231] According to this embodiment, the output connector 150 and the first inverter module 100 are provided in the first space 71a. This configuration allows at least a portion of the output connector 150 to be provided in a position aligned with at least one of the first inverter module 100 and the second inverter module 100 in the depth direction Y. Therefore, as described above, the difference in length between the first output line 12oa and the second output line 12ob can be minimized, thereby allowing a configuration in which the performance of each of the first inverter circuit 40 and the second inverter circuit 50 can be easily exhibited.

[0232] Fourth Embodiment In the first embodiment, both the inverter modules 100, 110 and the capacitor modules 120, 130 are provided in one of the first space 71a and the second space 75a. In contrast, in the fourth embodiment, components of one of the inverter modules 100, 110 and the capacitor modules 120, 130 are provided in one of the first space 71a and the second space 75a, and components of the other are provided in the other space. Configurations, actions, and effects not specifically described in the fourth embodiment are the same as those in the first embodiment. The fourth embodiment will be described mainly focusing on differences from the first embodiment.

[0233] 12 and 14 , the first space 71a is provided with inverter modules 100, 110, an output connector 150, an input connector 160, and a filter component group 180G. The first inverter module 100 and the second inverter module 110 are aligned in the depth direction Y, as in the second embodiment. Meanwhile, the inverter modules 100, 110 are arranged such that the P terminals 104, 114, the N terminals 105, 115, and the output terminals 106, 116 are aligned in the depth direction Y, as in the first embodiment. In this embodiment, as in the second embodiment, the depth direction Y corresponds to the alignment direction of the inverter modules 100, 110, and the width direction X corresponds to the perpendicular direction.

[0234] The first output terminal 106 and the second output terminal 116 are both provided between the first switch protection unit 103 and the second switch protection unit 113. The first P terminal 104 and the first N terminal 105 are provided on the opposite side of the first switch protection unit 103 from the second inverter module 110. The second P terminal 114 and the second N terminal 115 are provided on the opposite side of the second switch protection unit 113 from the first inverter module 100.

[0235] The output connectors 150 are arranged next to the inverter modules 100, 110 in the width direction X. The output connectors 150 are provided between one of the first width walls 72x and the inverter modules 100, 110. The output connectors 150 are provided at positions adjacent to both the first inverter module 100 and the second inverter module 110. The output connectors 150 are provided so as to span between the first inverter module 100 and the second inverter module 110 in the depth direction Y. The output connectors 150 are arranged next to the first output terminal 106 and the second output terminal 116 in the width direction X.

[0236] In the output connector 150, an output plate surface 151a extends in a direction perpendicular to the width direction X. The output connector 150 is placed on one of the first depth walls 72y. In the output connector 150, a plurality of connector terminals 26 are arranged in the depth direction Y along the first depth wall 72y.

[0237] At least a portion of the output wiring 143, 144 is provided between the first inverter module 100 and the second inverter module 110 in the depth direction Y. The first output wiring 143 extends as a whole in the width direction X from the output connector 150 toward the first output terminal 106. The second output wiring 144 extends as a whole in the width direction X from the output connector 150 toward the second output terminal 116.

[0238] The filter component group 180G is arranged in the width direction X on the inverter modules 100, 110. The filter component group 180G is provided between the inverter modules 100, 110 and the other first depth wall 72y. The filter component group 180G is provided on the opposite side of the inverter modules 100, 110 from the output connector 150. In the filter component group 180G, a plurality of filter components 180 are arranged in the depth direction Y along the first depth wall 72y.

[0239] The input connectors 160 are arranged in the filter component group 180G in the depth direction Y. The input connectors 160 are provided so as to penetrate the first width wall 72x in the depth direction Y. The input connectors 160 are provided at positions spaced apart from the inverter modules 100, 110 in the width direction X.

[0240] The control board 174 is placed over both the first drive board 171 and the second drive board 172. The control board 174 is provided so as to span between the first drive board 171 and the second drive board 172. The control board 174 is provided on the opposite side of the drive boards 171, 172 from the water channel wall 82. The first output wiring 143 and the second output wiring 144 are wired between the control board 174 and the water channel wall 82.

[0241] 13 and 14 , a switching module 90 and capacitor modules 120 and 130 are provided in the second space 75a. The switching module 90 and the capacitor modules 120 and 130 are aligned in the depth direction Y. The first capacitor module 120 and the second capacitor module 130 are aligned in the depth direction Y with the switching module 90 interposed therebetween. As in the third embodiment, the switching module 90 is oriented so that the first switching P terminal 94 and the second switching P terminal 95 are aligned in the depth direction Y.

[0242] 12, 13, and 14, the first inverter module 100 and the first capacitor module 120 are arranged side by side in the height direction Z with the channel wall 82 interposed therebetween. The first inverter module 100 has a portion that overlaps with the first capacitor module 120 in the height direction Z. The second inverter module 110 and the second capacitor module 130 are arranged side by side in the height direction Z with the channel wall 82 interposed therebetween. The second inverter module 110 has a portion that overlaps with the second capacitor module 130 in the height direction Z.

[0243] The inverter modules 100, 110 and the switching module 90 are arranged in the height direction Z via the water channel wall 82. The first inverter module 100 has a portion that overlaps with the switching module 90 in the height direction Z. The second inverter module 110 has a portion that overlaps with the switching module 90 in the height direction Z.

[0244] 12 and 13 , similarly to the third embodiment, third wiring holes 85c are provided in the water channel wall 82. A plurality of third wiring holes 85c are provided in the water channel wall 82. The third wiring holes 85c include a hole through which a wiring member connecting the first inverter module 100 and the first capacitor module 120 is inserted, and a hole through which a wiring member connecting the second inverter module 110 and the second capacitor module 130 is inserted.

[0245] The water channel wall 82 is provided with a fifth wiring hole 85e as the water channel wall hole 85. The fifth wiring hole 85e is a hole for inserting wiring members. Wiring members forming the switching P line 12pc, wiring members forming the switching N line 12nc, etc. are inserted into the fifth wiring hole 85e. For example, wiring members for connecting the inverter modules 100, 110 and the switching module 90 are inserted into the fifth wiring hole 85e.

[0246] The water passage 81 includes a first inverter path 81a, a second inverter path 81b, a switching path 81c, a first condenser path 81f, and a second condenser path 81g. The second condenser path 81g is a portion of the water passage 81 that overlaps with the second capacitor module 130. In the second condenser path 81g, the cooling effect of the refrigerant is more likely to be imparted to the second capacitor module 130.

[0247] In the water passage 81, at least a portion of the first inverter path 81a overlaps with the first capacitor path 81f and the switching path 81c. In the water passage 81, a portion between the first inverter module 100 and the first capacitor module 120 in the height direction Z is included in both the first inverter path 81a and the first capacitor path 81f. In addition, in the water passage 81, a portion between the first inverter module 100 and the switching module 90 in the height direction Z is included in both the first inverter path 81a and the switching path 81c.

[0248] In the water passage 81, at least a portion of the second inverter path 81b overlaps with the second capacitor path 81g and the switching path 81c. In the water passage 81, a portion between the second inverter module 110 and the second capacitor module 130 in the height direction Z is included in both the second inverter path 81b and the second capacitor path 81g. In addition, in the water passage 81, a portion between the second inverter module 110 and the switching module 90 in the height direction Z is included in both the second inverter path 81b and the switching path 81c.

[0249] <Configuration Group C> According to this embodiment, the first capacitor module 120 is arranged next to the second capacitor module 130 in the second space 75a along the water channel wall 82. In this configuration, the wiring members connecting the first capacitor module 120 and the second capacitor module 130 can be wired so as not to penetrate the water channel wall 82. This makes it possible to minimize the inductance of the wiring members, thereby suppressing resonance between the current flowing through the first capacitor module 120 and the current flowing through the second capacitor module 130.

[0250] The second inverter module 110 is arranged next to the first inverter module 100 in the first space 71a along the water channel wall 82. In this configuration, the wiring members connecting the second inverter module 110 and the first inverter module 100 can be routed so as not to penetrate the water channel wall 82. This minimizes the inductance of the wiring members, making it possible to shorten the first circulation path and the second circulation path when a short-circuit phase occurs and reduce the heat generated by the wiring members.

[0251] According to this embodiment, the first capacitor module 120 is arranged next to the first inverter module 100 via the water channel wall 82. In this configuration, the two components, the first capacitor module 120 and the first inverter module 100, can be fixed together in a relatively strong portion of the inverter housing 70. This makes it easy to realize a configuration in which the two components, the first capacitor module 120 and the first inverter module 100, are each less susceptible to vibration.

[0252] Furthermore, the second inverter module 110 is arranged next to the second capacitor module 130 via the water channel wall 82. In this configuration, the two components, the second inverter module 110 and the second capacitor module 130, can be fixed together in a relatively strong portion of the inverter housing 70. This makes it easy to realize a configuration in which the two components, the second inverter module 110 and the second capacitor module 130, are less likely to vibrate.

[0253] According to this embodiment, at least a portion of the water passage 81 is provided between the first inverter module 100 and the first capacitor module 120. In this configuration, the cooling effect of the refrigerant flowing through the water passage 81 can be easily imparted to both the first inverter module 100 and the first capacitor module 120. Furthermore, at least a portion of the water passage 81 is provided between the second inverter module 110 and the second capacitor module 130. In this configuration, the cooling effect of the refrigerant flowing through the water passage 81 can be easily imparted to both the second inverter module 110 and the second capacitor module 130.

[0254] Fifth Embodiment In the fourth embodiment, the first inverter module 100 and the second inverter module 110 are arranged side by side in the height direction Z, and the first output terminal 106 and the second output terminal 116 are positioned to face each other. In contrast, in the fifth embodiment, the first output terminal 106 and the second output terminal 116 are arranged so as not to face each other. Configurations, actions, and effects not specifically described in the fifth embodiment are the same as those in the fourth embodiment. The fifth embodiment will be described mainly focusing on differences from the fourth embodiment.

[0255] 15 , in the inverter modules 100 and 110, similar to the fourth embodiment, the P terminals 104 and 114, the N terminals 105 and 115, and the output terminals 106 and 116 are arranged in a direction aligned in the depth direction Y. One of the first output terminal 106 and the second output terminal 116 is provided between the first switch protection unit 103 and the second switch protection unit 113.

[0256] For example, the second output terminal 116 is provided between the first switch protection unit 103 and the second switch protection unit 113. The first output terminal 106 is provided on the opposite side of the first switch protection unit 103 from the second P terminal 114 and the second N terminal 115. In addition to the second output terminal 116, the first P terminal 104 and the first N terminal 105 are provided between the first switch protection unit 103 and the second switch protection unit 113. The first output terminal 106 is provided on the opposite side of the first switch protection unit 103 from the second output terminal 116. The second P terminal 114 and the second N terminal 115 are provided on the opposite side of the second switch protection unit 113 from the first P terminal 104 and the first N terminal 105.

[0257] As in the second embodiment, the output connector 150 is provided on the opposite side of the first inverter module 100 from the second inverter module 110 in the depth direction Y. As in the first embodiment, the first output terminal 106 is provided between the first switch protector 103 and the output connector 150. In this configuration, the first output terminal 106 and the output connector 150 are disposed as close as possible to each other, so that the first output wiring 143 can be wired as short as possible.

[0258] The output connector 150 is located on the opposite side of the first inverter module 100 from the second output terminal 116. The second output wiring 144 is connected to the second output terminal 116 and the second connector terminal 152b while detouring around the first inverter module 100 in the width direction X.

[0259] A third wiring hole 85c is provided between the first inverter module 100 and the second inverter module 110. A wiring member or the like that connects the first inverter module 100 and the first capacitor module 120 is inserted through this third wiring hole 85c.

[0260] <Configuration Group E> According to the present embodiment, the first output terminal 106 is provided on the side of the first switch protection unit 103 opposite the second inverter module 110. Furthermore, the second output terminal 116 is provided on the side of the second switch protection unit 113 opposite the first inverter module 100. In these configurations, the first output terminal 106 and the second output terminal 116 can be disposed at positions separated in the depth direction Y via the switch protection units 103, 113. Therefore, even if heat is generated from the first output terminal 106 or the second output terminal 116, it is possible to prevent this heat from being trapped in the space between the first switch protection unit 103 and the second switch protection unit 113.

[0261] Sixth Embodiment In the fourth embodiment, the first inverter module 100 and the second inverter module 110 are arranged side by side in the height direction Z, and the first output terminal 106 and the second output terminal 116 are provided between the first switch protection unit 103 and the second switch protection unit 113. In contrast, in the sixth embodiment, neither the first output terminal 106 nor the second output terminal 116 is provided between the first switch protection unit 103 and the second switch protection unit 113. Configurations, actions, and effects not specifically described in the sixth embodiment are the same as those in the fourth embodiment. The sixth embodiment will be described mainly focusing on differences from the fourth embodiment.

[0262] 16 , in the inverter modules 100 and 110, similar to the fourth embodiment, the P terminals 104 and 114, the N terminals 105 and 115, and the output terminals 106 and 116 are arranged in a direction aligned in the depth direction Y. The P terminals 104 and 114 and the N terminals 105 and 115 are provided between the first switch protection unit 103 and the second switch protection unit 113. The first output terminal 106 is provided on the opposite side of the first switch protection unit 103 from the second inverter module 110. The second output terminal 116 is provided on the opposite side of the second switch protection unit 113 from the first inverter module 100.

[0263] As in the fourth embodiment, the output connectors 150 are arranged next to the inverter modules 100, 110 in the width direction X. The output connectors 150 are arranged next to the P terminals 104, 114 and the N terminals 105, 115 in the width direction X. The output connectors 150 are provided at a position approximately midway between the first output terminal 106 and the second output terminal 116 in the depth direction Y.

[0264] The first output wiring 143 is connected to the first output terminal 106 and the first connector terminal 152a while detouring around the first inverter module 100 in the width direction X and the depth direction Y. The second output wiring 144 is connected to the second output terminal 116 and the second connector terminal 152b while detouring around the second inverter module 110 in the width direction X and the depth direction Y.

[0265] Similar to the fifth embodiment, the third wiring hole 85c is provided between the first inverter module 100 and the second inverter module 110. A wiring member connecting the first inverter module 100 and the first capacitor module 120, a wiring member connecting the second inverter module 110 and the second capacitor module 130, and the like are inserted into the third wiring hole 85c.

[0266] Seventh Embodiment In the first embodiment, the switching circuit 60 can switch the energization state of the P line 12p. In contrast, in the seventh embodiment, the switching circuit 60 can switch the energization state of each of the P line 12p and the N line 12n. Configurations, actions, and effects that are not specifically described in the seventh embodiment are the same as those in the first embodiment. The seventh embodiment will be described mainly focusing on the differences from the first embodiment.

[0267] 17, the switching circuit 60 has an N switch 63 in addition to a P switch 61. The N switch 63 is provided in the switching N line 12nc. The N switch 63 is provided between the first inverter circuit 40 and the second inverter circuit 50. The N switch 63 can cut off the current flow through the switching N line 12nc. The N switch 63 corresponds to a changeover switch.

[0268] The N switch 63 is formed of a switching element, similar to the P switch 61. The N switch 63 can be switched between a conducting state in which a current flows and a blocking state in which the current is blocked. The N switch 63 is sometimes called a switch. The N switch 63 may be formed of a mechanical switch.

[0269] The N switch 63 switches on and off in response to a drive command from the control circuit 36, etc. A drive signal for driving the N switch 63 is generated by the switching drive circuit 37c. When the drive mode of the motor 20 is star-connection drive, both the P switch 61 and the N switch 63 may be in a cut-off state. When the drive mode of the motor 20 is open-connection drive, both the P switch 61 and the N switch 63 are in a conducting state.

[0270] 18 , the switching module 90 has an N switch section 97 in addition to a P switch section 91 and a switch protection section 93. The N switch section 97 is a component that has an N switch 63. The N switch section 97 forms the N switch 63. The N switch section 97 is formed of a semiconductor chip or the like. The N switch section 97 is protected by the switch protection section 93.

[0271] The switching module 90 has a first switching N terminal 98 and a second switching N terminal 99. The switching N terminals 98, 99 are conductive members formed of a conductive material such as copper. Wiring members are electrically connected to each of the switching N terminals 98, 99. The first switching N terminal 98 is a terminal member for connecting the N switch 63 to the first N line 12na. For example, the first switching N terminal 98 forms part of the switching N line 12nc. The second switching N terminal 99 is a terminal member for connecting the N switch 63 to the second N line 12nb. For example, the second switching N terminal 99 forms part of the switching N line 12nc.

[0272] The switching N terminals 98, 99 are arranged along the outer peripheral edge of the switching module 90. The switching N terminals 98, 99 are provided so as to protrude outward from the changeover switch protector 93. For example, the first switching N terminal 98 is provided on the opposite side of the changeover switch protector 93 from the second switching N terminal 99.

[0273] Eighth Embodiment In the first embodiment, the first inverter circuit 40 is connected to one end of the motor coil 22, and the second inverter circuit 50 is connected to the other end. In contrast, in the eighth embodiment, both the first inverter circuit 40 and the second inverter circuit 50 are connected to one end of the motor coil 22. Configurations, actions, and effects that are not specifically described in the eighth embodiment are the same as those in the first embodiment. The eighth embodiment will be described mainly focusing on differences from the first embodiment.

[0274] 19 , the first inverter circuit 40 and the second inverter circuit 50 are connected in parallel to the motor 20. For example, both the first inverter circuit 40 and the second inverter circuit 50 are connected to the first coil ends 22 a of the motor coil 22. The second coil ends 22 b of the multiple phases may be connected to each other to form a neutral point of the motor coil 22.

[0275] The first inverter circuit 40 and the second inverter circuit 50 are also connected in parallel to the battery 11. The switching P line 12pc and the switching N line 12nc are power lines 12 for connecting the first inverter circuit 40 and the second inverter circuit 50 in parallel to the battery 11. The switching P line 12pc and the switching N line 12nc are provided for at least one of the first inverter circuit 40 and the second inverter circuit 50. For example, the switching P line 12pc and the switching N line 12nc are provided for the second inverter circuit 50. In this configuration, the switching P line 12pc and the switching N line 12nc connect the battery 11 and the second inverter circuit 50. The switching circuit 60 can cut off the power supply from the battery 11 to the second inverter circuit 50.

[0276] The switching P line 12pc and the switching N line 12nc may be provided for the first inverter circuit 40 and the second inverter circuit 50, respectively. In this configuration, the switching P line 12pc and the switching N line 12nc include lines 12pc and 12nc connecting the battery 11 and the first inverter circuit 40 and lines 12pc and 12nc connecting the battery 11 and the second inverter circuit 50. The switching circuit 60 provided on the lines 12pc and 12nc connecting the battery 11 and the first inverter circuit 40 can cut off the power supply from the battery 11 to the first inverter circuit 40. The switching circuit 60 provided on the lines 12pc and 12nc connecting the battery 11 and the second inverter circuit 50 can cut off the power supply from the battery 11 to the second inverter circuit 50.

[0277] <Other Embodiments> The disclosure of this specification is not limited to the exemplified embodiments. The disclosure encompasses the exemplified embodiments and modifications thereto by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and elements shown in the embodiments, and can be implemented in various modifications. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses the omission of parts and elements from the embodiments. The disclosure encompasses the substitution or combination of parts and elements between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is defined by the claims, and should be interpreted as including all modifications within the meaning and scope equivalent to the claims.

[0278] <Configuration Group A> In each of the above embodiments, the first inverter module 100, the second inverter module 110, and the switching module 90 may be arranged in any manner as long as they are housed in the inverter housing 70. For example, the first inverter module 100 may be provided in one of the first space 71a and the second space 75a, and the second inverter module 110 and the switching module 90 may be provided in the other space. Furthermore, at least one of the first inverter module 100 and the second inverter module 110 may be arranged next to the switching module 90 with the water channel wall 82 interposed therebetween.

[0279] In each of the above embodiments, the water channel 81 may be provided so as not to overlap the first inverter module 100, the second inverter module 110, or the switching module 90. For example, the water channel 81 may not have the first inverter path 81a, the second inverter path 81b, or the switching path 81c.

[0280] In each of the above embodiments, the first inverter module 100 and the second inverter module 110 do not have to be the same inverter components. For example, the positional relationship between the switch units 101, 102, 111, and 112 may be different between the first inverter module 100 and the second inverter module 110. Furthermore, the first inverter module 100 and the second inverter module 110 may have different model numbers, etc.

[0281] In each of the above embodiments, the inverter modules 100, 110 and the switching module 90 may be provided in any position relative to the capacitor modules 120, 130, the filter component group 180G, the output connector 150, and the input connector 160. For example, in the above first embodiment, in addition to the inverter modules 100, 110 and the switching module 90, the filter component group 180G and the input connector 160 may be provided in the first space 71a.

[0282] <Configuration Group B> In each of the above embodiments, the four components, i.e., the inverter modules 100, 110 and the capacitor modules 120, 130, may be arranged in any manner as long as they are provided in one of the first space 71a and the second space 75a. For example, the four components may be arranged such that the first inverter module 100 and the second capacitor module 130 are adjacent to each other in one of the first space 71a and the second space 75a. Furthermore, among the four components, the first capacitor module 120 and the second capacitor module 130 may be provided between the first inverter module 100 and the second inverter module 110.

[0283] In each of the above embodiments, the four components may be arranged in any manner with respect to the water channel 81 in one of the first space 71a and the second space 75a. For example, each of the four components may be arranged in a position overlapping the water channel 81. That is, in a configuration in which the four components are arranged in one of the first space 71a and the second space 75a, the water channel 81 may have inverter paths 81a, 81b and capacitor paths 81f, 81g.

[0284] In each of the above embodiments, any other components may be provided in addition to the four components in one of the first space 71 a and the second space 75 a. For example, in addition to the four components, a filter component group 180G or an input connector 160 may be provided in one of the first space 71 a and the second space 75 a.

[0285] <Configuration Group C> In each of the above embodiments, the four components, i.e., the inverter modules 100, 110 and the capacitor modules 120, 130, may be arranged in any manner as long as two are provided in each of the first space 71a and the second space 75a. For example, in the third and fourth embodiments, the first inverter module 100 may be provided in the second space 75a, and the second capacitor module 130 may be provided in the first space 71a. In the third embodiment, the first inverter module 100 and the second inverter module 110 may be provided at positions offset from each other or spaced apart from each other in the width direction X or the depth direction Y. Furthermore, in the fourth embodiment, the first inverter module 100 and the second capacitor module 130 may be arranged side by side in the height direction Z with the channel wall 82 interposed therebetween.

[0286] In each of the above embodiments, in each of the first space 71a and the second space 75a, the two components may be provided in any manner relative to the water channel 81. For example, at least one of the two components may be provided so as to overlap the water channel 81, or neither of the two components may be provided in a position where it does not overlap the water channel 81. For example, in the above third embodiment, the first condenser path 81f and the second condenser path 81g may be provided in the water channel wall 82 between the first capacitor module 120 and the second capacitor module 130.

[0287] In each of the above embodiments, any other components may be provided in addition to the two components in each of the first space 71 a and the second space 75 a. For example, in the above fourth embodiment, the first space 71 a may be provided with a switching module 90 in addition to the two components, i.e., the inverter modules 100 and 110, and the filter component group 180G.

[0288] <Configuration Group D> In each of the above embodiments, at least a portion of the output connector 150 may be provided in any position as long as it is aligned with at least one of the inverter modules 100, 110 in a direction perpendicular to the alignment direction of the inverter modules 100, 110. The positional relationship between the output connector 150 and the inverter modules 100, 110 includes the first embodiment, the third embodiment, the fourth embodiment, the sixth embodiment, and the like.

[0289] In each of the above embodiments, in a configuration in which the output connector 150 and the inverter modules 100, 110 are aligned in an orthogonal direction, the orientation of the output connector 150 and the orientation of the inverter modules 100, 110 may be any. For example, the output connector 150 may be provided so as to extend in a direction orthogonal to the alignment direction of the inverter modules 100, 110. For example, in the above first embodiment, the output connector 150 may be provided so as to extend in a direction orthogonal to the width direction X.

[0290] In each of the above embodiments, the positional relationship between the output connector 150 and the inverter modules 100, 110 may be any as long as the output connector 150 and the inverter modules 100, 110 are arranged in the orthogonal direction. For example, in the above first embodiment, the capacitor modules 120, 130, the switching module 90, etc. may be provided between the output connector 150 and the inverter modules 100, 110 in the depth direction Y. Furthermore, the output connector 150 may be provided at a position shifted or separated from the inverter modules 100, 110 in the height direction Z.

[0291] <Configuration Group E> In each of the above embodiments, the output connector 150 may be provided at any position as long as it is provided on the opposite side of one of the first inverter module 100 and the second inverter module 110. For example, the output connector 150 may be provided on the opposite side of one of the first inverter module 100 and the second inverter module 110 in the height direction Z or the width direction X.

[0292] In each of the above embodiments, in a configuration in which the output connector 150 is provided on the opposite side of one of the inverter modules 100, 110 from the other, the orientation of the output connector 150 and the orientation of the inverter modules 100, 110 may be any. For example, the output connector 150 may be provided so as to extend along the arrangement direction of the inverter modules 100, 110. For example, in the above first embodiment, the output connector 150 may be provided so as to extend in a direction perpendicular to the height direction Z.

[0293] In each of the above embodiments, the positional relationship between the output connector 150 and the inverter modules 100, 110 may be any as long as the output connector 150 is provided on the opposite side of one of the inverter modules 100, 110. For example, in the above second embodiment, the capacitor modules 120, 130 or the switching module 90 may be provided between the output connector 150 and the inverter modules 100, 110 in the depth direction Y. Also, in the above second embodiment, the output connector 150 may be provided at a position offset from the inverter modules 100, 110 in the height direction Z or the width direction X.

[0294] <Common> In each of the above embodiments, components such as the inverter modules 100, 110, the capacitor modules 120, 130, and the switching module 90 may be provided in any orientation. For example, the inverter modules 100, 110 and the drive boards 171, 172 may be provided so as to extend in a direction perpendicular to the width direction X or the depth direction Y. The orientations of the first inverter module 100 and the second inverter module 110 may be different. For example, the direction in which the first P terminal 104, the first N terminal 105, and the first output terminal 106 are aligned may be different from the direction in which the second P terminal 114, the second N terminal 115, and the second output terminal 116 are aligned.

[0295] In the output connector 150, the output opposing surface 151b does not have to face the motor 20. Even in this configuration, the motor connector 25 can be connected to the output connector 150 as long as the motor connector 25 is provided in a state in which it can be displaced relative to the motor housing 24.

[0296] In each of the above embodiments, the output connector 150 may have any shape or structure. For example, in the output connector 150, the multiple output connector terminals 152 do not have to be arranged in a single row. For example, the output connector 150 may have two rows of multiple first connector terminals 152a and multiple second connector terminals 152b. Furthermore, the output connector 150 may be provided in any orientation. For example, the output connector 150 may be provided in an orientation extending in a direction perpendicular to the width walls 72x, 76x and the depth walls 72y, 76y.

[0297] In each of the above embodiments, components such as the inverter modules 100, 110, the capacitor modules 120, 130, and the switching module 90 may be provided in any positional relationship. For example, the inverter modules 100, 110 and the drive boards 171, 172 do not have to be stacked on top of each other. For example, the inverter modules 100, 110 and the drive boards 171, 172 may be provided at positions separated from each other in the width direction X or the depth direction Y.

[0298] In each of the above embodiments, the internal space of the inverter housing 70 may be divided in any manner by a space dividing portion such as the water channel wall 82. For example, the first space 71a and the second space 75a may be divided so as to be aligned in the width direction X or the depth direction Y. The internal space of the inverter housing 70 may also not be divided. In other words, the inverter housing 70 may not have a space dividing portion.

[0299] In each of the above embodiments, the water channel 81 may be provided at a position overlapping the output connector 150. For example, in the above first embodiment, a portion of the water channel 81 and the output connector 150 may be aligned in the height direction Z. In this configuration, the portion of the water channel 81 that overlaps the output connector 150 may be referred to as the output connector path. In this configuration, the cooling effect of the refrigerant is more likely to be imparted to the output connector 150 from the output connector path.

[0300] In each of the above embodiments, the water channel 81 may have a branching portion or a merging portion. For example, the water channel 81 may branch into two branching paths. One of the two branching paths may be located at a position overlapping the first inverter module 100, and the other may be located at a position overlapping the second inverter module 110. The merging point of the two branching paths may be located at a position overlapping the switching module 90 or the capacitor modules 120 and 130.

[0301] In each of the above embodiments, the water channel 81 may be provided in any manner in the inverter housing 70. For example, the water channel 81 may extend so as to fill the entire first space 71a or the second space 75a in a plan view. The water channel 81 may also be provided in the case outer wall 701a, the first outer peripheral wall 72, the second outer peripheral wall 76, or the like. The water channel 81 may also be provided in the first space 71a or the second space 75a. For example, the water channel 81 may be formed by piping or the like provided in the first space 71a or the second space 75a. Furthermore, the water channel 81 does not have to be provided in the inverter housing 70. For example, the space partition portion does not have to form the water channel 81.

[0302] In each of the above embodiments, the motor housing 24 and the inverter housing 70 of the motor unit 15 may be integrally formed. For example, the motor unit 15 may have a unit housing. The unit housing forms both the motor housing 24 and the inverter housing 70. The unit housing accommodates the modules 100, 110, the capacitor modules 120, 130, etc. In this configuration, the unit housing corresponds to the housing.

[0303] In each of the above embodiments, the moving body on which the motor unit 15 is mounted does not have to be an aircraft, as long as it can move by rotation of a rotating body. For example, the moving body may be a vehicle, a ship, construction machinery, or agricultural machinery. For example, if the moving body is a vehicle or construction machinery, the rotating body may be a wheel for movement, and the output shaft may be an axle. If the moving body is a ship, the rotating body may be a screw propeller for propulsion, and the output shaft may be a propeller shaft.

[0304] (Disclosure of Technical Ideas) This specification discloses multiple technical ideas described in the following multiple clauses. Some clauses may be described in a multiple dependent form, with the subsequent clause alternatively referring to the preceding clause. Furthermore, some clauses may be described in a multiple dependent form, with the subsequent clause referring to another multiple dependent clause. These multiple dependent clauses define multiple technical ideas.

[0305] (Technical Idea 1) A power conversion device (30) for converting power supplied to a rotating electric machine (20), comprising: a first inverter component (100) formed with a plurality of first switches (42, 43) and having a first inverter (40) connected to a winding (22) of the rotating electric machine, the first inverter component converting power supplied to the winding by the first inverter; a second inverter component (110) formed with a plurality of second switches (52, 53) and having a second inverter (50) connected to the winding, the second inverter component being a component independent of the first inverter component, the second inverter component converting power supplied to the winding by the second inverter; a switching path (12pc) capable of switching a current-carrying state of the winding, connecting the first inverter and the second inverter so as to be conductive without passing through the winding; and a switching component (90) having a changeover switch (61, 63) provided in the switching path, the changeover switch being a component independent of the first inverter component and the second inverter component, the changeover switch being capable of cutting off current flow through the switching path. a housing (70) that houses the first inverter components, the second inverter components, and the switching components.

[0306] (Technical Idea 2) The power conversion device according to Technical Idea 1, wherein at least a part of the switching component is provided at a position aligned with at least one of the first inverter component and the second inverter component in a direction perpendicular to an arrangement direction of the first inverter component and the second inverter component.

[0307] (Technical Idea 3) The power conversion device according to Technical Idea 1 or 2, further comprising: a flow path forming portion (82) that is arranged to divide the internal space of the housing into a first space (71a) and a second space (75a) and forms a refrigerant flow path (81) through which a refrigerant flows; and the first inverter component, the second inverter component, and the switching component are arranged in one of the first space and the second space.

[0308] (Technical Idea 4) A power conversion device according to Technical Idea 1 or 2, comprising: a flow path forming portion (82) arranged to divide the internal space of the housing into a first space (71a) and a second space (75a), and forming a refrigerant flow path (81) through which a refrigerant flows; wherein one of the first inverter component, the second inverter component, and the switching component is arranged in one of the first space and the second space, and two are arranged in the other space.

[0309] (Technical Idea 5) A power conversion device according to any one of Technical Ideas 1 to 4, having an inverter circuit formed including a plurality of switching elements and comprising a plurality of inverter components connected to the windings, wherein the first inverter component is the inverter component among the plurality of inverter components, in which the first switch is formed by the switching element and the first inverter is formed by the inverter circuit, and the second inverter component is the inverter component among the plurality of inverter components, in which the second switch is formed by the switching element and the second inverter is formed by the inverter circuit.

[0310] (Technical Idea 6) A power conversion device according to any one of Technical Ideas 1 to 5, comprising: a filter component (180) forming at least a part of a filter circuit (33) connected in parallel to one of the first inverter and the second inverter; and a filter component group (180G) accommodated in the housing and arranged so that a plurality of the filter components are grouped together.

[0311] (Technical Idea 7) The power conversion device according to Technical Idea 6, wherein the plurality of filter components are arranged in an arrangement direction of the second inverter component such that the filter component group is stretched across the first inverter component and the second inverter component.

[0312] (Technical Idea 8) A power conversion device according to Technical Idea 6 or 7, comprising a flow path forming portion (82) arranged to divide the internal space of the housing into a first space (71a) and a second space (75a), forming a refrigerant flow path (81) through which a refrigerant flows, wherein both the first inverter components and the second inverter components are arranged in one of the first space and the second space, and the filter component group is arranged in the other space.

[0313] (Technical Idea 9) The power conversion device according to any one of Technical Ideas 1 to 8, wherein the first inverter is connected to one end (22a) of the winding, and the second inverter is connected to the other end (22b) of the winding.

[0314] (Technical Idea 10) A rotating electric machine unit (15) including a rotating electric machine (20) driven by a supply of electric power, and a power conversion device (30) that converts electric power supplied to the rotating electric machine, wherein a first inverter component (100) is formed including a plurality of first switches (42, 43), has a first inverter (40) connected to a winding (22) of the rotating electric machine, and converts electric power supplied to the winding by the first inverter, a second inverter component (110) is formed including a plurality of second switches (52, 53), has a second inverter (50) connected to the winding, and is a component independent of the first inverter component, and converts electric power supplied to the winding by the second inverter, a switching path (12pc) that can switch an electric state of the winding, and connects the first inverter and the second inverter so as to be electrically conductive without passing through the winding, a switching component (90) that has a changeover switch (61) provided in the switching path, is a component independent of the first inverter component and the second inverter component, and can cut off current to the switching path by the changeover switch; and a housing (70) that accommodates the first inverter component, the second inverter component, and the switching component.

Claims

1. A power conversion device (30) that converts power supplied to a rotating electrical machine (20), comprising: A first inverter part (100) formed by including a plurality of first switches (42, 43) and connected to a winding (22) of the rotating electrical machine, for converting power supplied to the winding by the first inverter; A second inverter part (110) formed by including a plurality of second switches (52, 53) and connected to the winding, being a part independent of the first inverter part, for converting power supplied to the winding by the second inverter; A switching path (12pc) capable of switching the energization state of the winding and connecting the first inverter and the second inverter in an energizable manner without passing through the winding; A switching part (90) having switching switches (61, 63) provided in the switching path, being a part independent of the first inverter part and the second inverter part, for interrupting the energization of the switching path by the switching switches; A housing (70) housing the first inverter part, the second inverter part, and the switching part.

2. The power conversion device according to claim 1, wherein at least a part of the switching part is provided at a position aligned with at least one of the first inverter part and the second inverter part in a direction orthogonal to the alignment direction of the first inverter part and the second inverter part.

3. A flow path forming part (82) provided so as to partition the internal space of the housing into a first space (71a) and a second space (75a) and forming a refrigerant flow path (81) through which refrigerant flows, The power conversion device according to claim 1 or 2, wherein the first inverter part, the second inverter part, and the switching part are provided in one of the first space and the second space.

4. A flow path forming part (82) provided so as to partition the internal space of the housing into a first space (71a) and a second space (75a) and forming a refrigerant flow path (81) through which refrigerant flows, The power conversion device according to claim 1 or 2, wherein one of the first inverter part, the second inverter part, and the switching part is provided in one of the first space and the second space, and two are provided in the other space.

5. The power conversion device according to claim 1 or 2, comprising an inverter circuit formed including a plurality of switching elements, and including a plurality of inverter components connected to the winding, wherein the first inverter component is the inverter component among the plurality of inverter components in which the first switch is formed by the switching element and the first inverter is formed by the inverter circuit, and the second inverter component is the inverter component among the plurality of inverter components in which the second switch is formed by the switching element and the second inverter is formed by the inverter circuit.

6. The power conversion device according to claim 1, further comprising: a filter component (180) forming at least a part of a filter circuit (33) connected in parallel to one of the first inverter and the second inverter; and a filter component group (180G) housed in the housing and provided such that a plurality of the filter components are assembled.

7. The power conversion device according to claim 6, wherein the plurality of filter components are arranged in a direction parallel to the second inverter component so that the filter component group spans the first inverter component and the second inverter component.

8. The power conversion device according to claim 6 or 7, further comprising a flow path forming portion (82) provided to partition an internal space of the housing into a first space (71a) and a second space (75a) and forming a refrigerant flow path (81) through which refrigerant flows, wherein both the first inverter component and the second inverter component are provided in one of the first space and the second space, and the filter component group is provided in the other.

9. The power conversion device according to claim 1 or 2, wherein the first inverter is connected to one end (22a) of the winding, and the second inverter is connected to the other end (22b) of the winding.

10. A rotating electrical machine unit (15) comprising a rotating electrical machine (20) driven by power supply and a power conversion device (30) for converting the power supplied to the rotating electrical machine, the rotating electrical machine unit having a first inverter (40) formed by including a plurality of first switches (42, 43) and connected to a winding (22) of the rotating electrical machine, a first inverter component (100) for converting the power supplied to the winding by the first inverter, a second inverter (50) formed by including a plurality of second switches (52, 53) and connected to the winding, a second inverter component (110) which is a component independent of the first inverter component and for converting the power supplied to the winding by the second inverter, a switching path (12pc) capable of switching the energization state of the winding and connecting the first inverter and the second inverter in an energizable manner without passing through the winding, a switching switch (61) provided in the switching path, a switching component (90) which is a component independent of the first inverter component and the second inverter component and capable of interrupting the energization of the switching path by the switching switch, and a housing (70) housing the first inverter component, the second inverter component and the switching component.

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