Rotary electric machine unit

Abstract

To provide a rotary electric machine unit capable of simplifying a configuration related to partition members and reducing costs.SOLUTION: A rotary electric machine unit includes: a rotary electric machine having a rotor, a rotating shaft, a plurality of motor windings, a motor housing, and a partition member; and a power conversion device having an inverter, a control substrate, and an inverter housing. The partition member partitions the interior space of the motor housing and the internal space of the inverter housing, a plurality of detection target portions electrically connected to the tip portion of the rotating shaft and the plurality of motor windings extends into the inverter housing, and the power conversion device includes a rotation detection section provided inside the inverter housing to detect the rotation speed of the rotor and a temperature detection section provided inside the inverter housing and mounted on the control substrate to detect the temperatures of the plurality of detection target portions.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a rotating electrical machine unit. [Background technology]

[0002] Conventionally, there has been known a rotating electric machine unit in which the entire device is miniaturized by integrating a rotating electric machine with a power conversion device. For example, in Patent Document 1, the tip of the rotating shaft of the rotating electric machine is disposed inside the inverter housing of the power conversion device, thereby miniaturizing the rotating electric machine unit. Also, in Patent Document 1, a partition member (partition wall) is provided to separate the internal space of the motor housing, which houses the rotor and other components of the rotating electric machine, from the internal space of the inverter housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6977803 Summary of the Invention [Problem to be solved by the invention]

[0004] A rotating electric machine unit is provided with a rotation detector that detects the rotational speed of the rotor and a temperature detector that detects the temperature of the motor windings. In Patent Document 1, the rotation detector and temperature detector are provided inside the motor housing and connected to a control board housed in the inverter housing via a signal line. In this case, an opening for passing the signal line must be provided in the partition member. Furthermore, in high-power motors with an output exceeding 100 kW, cooling oil is typically circulated inside the motor housing to cool the motor windings in order to improve the cooling efficiency of the rotating electric machine. The structure described in Patent Document 1 requires a seal member to seal the gap between the opening in the partition member and the signal line to prevent the cooling oil from leaking outside the motor housing. This complicates the structure related to the partition member, increasing the cost of the rotating electric machine unit. Furthermore, providing the rotation detector and temperature detector inside the motor housing requires the use of highly oil-resistant and heat-resistant sensors, which also increases the cost of the rotating electric machine unit.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a rotating electrical unit that can simplify the configuration related to the partition member and reduce costs. [Means for solving the problem]

[0006] The rotating electric machine unit according to the present disclosure comprises a rotating electric machine having a rotor, a rotating shaft fixed to the rotor, a plurality of motor windings that rotate the rotor around its axis when a current flows through them, a motor housing that accommodates the rotor, and a partition member that closes the motor housing; and a power conversion device having an inverter arranged alongside the rotating electric machine in an axial direction along the axis and capable of supplying current to the plurality of motor windings, a control board that mounts a control circuit that controls the inverter, and an inverter housing that accommodates the inverter and the control board, wherein the partition member is fixed to the inverter housing and separates the internal space of the motor housing from the internal space of the inverter housing, and a tip of the rotating shaft and a plurality of detection targets electrically connected to the plurality of motor windings extend to the internal space of the inverter housing, and the power conversion device has a rotation detection unit arranged inside the inverter housing and detecting the rotational speed of the rotor, and a temperature detection unit arranged inside the inverter housing and mounted on the control board and detecting the temperature of the plurality of detection targets. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a rotating electrical unit that can simplify the configuration related to the partition member and reduce costs. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a rotary electric machine unit according to a first embodiment. [Figure 2] 1 is a circuit diagram of a rotary electric machine unit according to a first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the rotary electric machine unit according to the first embodiment. [Figure 4] 1 is a cross-sectional view of a rotating electric machine according to a first embodiment. [Figure 5] 1 is a schematic diagram showing a power conversion device according to a first embodiment. [Figure 6] FIG. 2 is a perspective view of a control board according to the first embodiment. [Figure 7] 2 is a perspective view of a rotation detection target and a rotation detection unit according to the first embodiment. FIG. [Figure 8] FIG. 10 is a perspective view of a control board and a rotation detection board according to a second embodiment. [Figure 9] 10 is a side view of a control board and a rotation detection board according to a second embodiment. FIG. [Figure 10] FIG. 10 is a schematic diagram showing a temperature detection unit according to a third embodiment. [Figure 11] 10 is a schematic diagram showing a current detection section and a temperature detection section according to a modification of the first embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] <First Embodiment> A rotating electrical machine unit 1 according to a first embodiment will be described below with reference to the drawings. Fig. 1 is a perspective view of the rotating electrical machine unit 1. Fig. 2 is a circuit diagram of the rotating electrical machine unit 1.

[0010] 1, the rotating electrical machine unit 1 includes a rotating electrical machine 2 and a power converter 3. The rotating electrical machine 2 and the power converter 3 are integrated together. The rotating electrical machine unit 1 is mounted on, for example, a vehicle.

[0011] The power conversion device 3 has an inverter housing 58 that houses electronic components and the like of the power conversion device 3. A DC power supply terminal block 10 is provided on the top surface of the inverter housing 58. A signal connector 51 is provided on the side surface of the inverter housing 58. The rotating electric machine unit 1 is connected to an on-board battery 4 (see FIG. 2) mounted on the vehicle via the DC power supply terminal block 10 and a power transmission cable. Driving power is supplied to the rotating electric machine unit 1 from the on-board battery 4. The rotating electric machine unit 1 is also connected to an electric control unit (ECU) mounted on the vehicle via the signal connector 51 and a signal transmission cable. The rotating electric machine unit 1 transmits and receives various signals required for control of the rotating electric machine unit 1 to and from the electric control unit. The rotating electric machine unit 1 controls the rotating electric machine 2 in accordance with control commands from the electric control unit.

[0012] The circuit configuration (electrical configuration) of the rotating electrical machine unit 1 will be described with reference to Fig. 2. In this embodiment, the rotating electrical machine unit 1 is a dual three-phase drive system having two sets of three-phase inverter circuits. The dual three phases are U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase. DC power is input to the power conversion device 3 from the vehicle-mounted battery 4 via a DC power supply terminal block 10. The power conversion device 3 converts the DC power input from the vehicle-mounted battery 4 into AC power and supplies it to the rotating electrical machine 2.

[0013] The rotating electric machine 2 is a dual three-phase drive motor and includes six motor windings 32 provided corresponding to the dual three phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase).

[0014] The power conversion device 3 includes an inverter 8, a capacitor module 11, a control board 5, and a drive board 16.

[0015] The capacitor module 11 is provided on the input side of the inverter 8. The capacitor module 11 is a smoothing capacitor that stabilizes the voltage supplied from the vehicle-mounted battery 4 so that it does not fluctuate greatly.

[0016] The inverter 8 has six power modules 9 provided corresponding to each of the dual three phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase). The three power modules 9 corresponding to the U1 phase, V1 phase, and W1 phase are connected in parallel to form a first three-phase AC full-bridge circuit. The three power modules 9 corresponding to the U2 phase, V2 phase, and W2 phase are connected in parallel to form a second three-phase AC full-bridge circuit.

[0017] The power module 9 includes a pair of power semiconductors 9a and 9b connected in series. The power semiconductors 9a and 9b are, for example, insulated gate bipolar transistors (IGBTs) or metal oxide semiconductor field effect transistors (MOSFETs).

[0018] The power module 9 is electrically connected to the motor winding 32 of the corresponding phase of the rotating electric machine 2 via the relay bus bar 13 and the power feed line 34. Specifically, an end of the motor winding 32 is connected to the power feed line 34. An end of the power feed line 34 is connected to one end of the relay bus bar 13 using a terminal block 17. Note that the power feed line 34 may not be provided, and an end (lead wire) of the motor winding 32 may be connected to one end of the relay bus bar 13. The other end of the relay bus bar 13 may be connected to an output terminal of the power module 9, for example, by welding. The power module 9 supplies power to the motor winding 32 of the corresponding phase of the rotating electric machine 2.

[0019] The power conversion device 3 includes six current detection units 12 provided corresponding to each of the dual three phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase). The current detection units 12 are attached to the relay bus bars 13 of the corresponding phases. Note that FIG. 2 shows only the current detection unit 12 for the W1 phase. The current detection units 12 detect the current flowing through the motor windings 32 by sensing the current flowing through the relay bus bars 13. The current detection units 12 are mounted on a drive board 16.

[0020] The power conversion device 3 includes a temperature detection unit 6 and a rotation detection unit 7. In this embodiment, the temperature detection unit 6 and the rotation detection unit 7 are mounted on the control board 5. The temperature detection unit 6 is disposed close to the power supply line 34. The temperature detection unit 6 detects the temperature corresponding to the motor winding 32 by sensing the temperature of the power supply line 34. The power supply line 34 is electrically connected to the motor winding 32 and corresponds to the detection target whose temperature is detected by the temperature detection unit 6. Note that if the power supply line 34 is not provided and an end (lead wire) of the motor winding 32 is connected to one end of the relay bus bar 13, the end of the motor winding 32 corresponds to the detection target. The rotation detector 7 detects the rotation speed of the rotor 31 of the rotating electrical machine 2 . The temperature detection unit 6 and the rotation detection unit 7 will be described in detail later.

[0021] The control board 5 includes a control circuit C1 for controlling the inverter 8. The control circuit C1 is configured with a microcomputer and the like that controls the energization of the power conversion device 3. A control command is input to the control circuit C1 from the electric control unit via a signal connector 51. Detection results from the current detection unit 12, the rotation detection unit 7, the temperature detection unit 6, and the like are also input to the control circuit C1. Based on the detection results from the rotation detection unit 7, the current detection unit 12, and the like, the control circuit C1 drives and controls the inverter 8 so that the rotating electric machine 2 operates at a rotation speed and torque in accordance with the control command from the electric control unit. Based on the detection results from the temperature detection unit 6, the control circuit C1 also performs protective control, for example, by reducing the current in the motor windings 32, when the temperature of the power supply line 34 (motor windings 32) exceeds a preset protective threshold.

[0022] The drive board 16 includes a drive circuit C2 for driving the power module 9. A control terminal of the power module 9 is connected to the drive board 16. The drive circuit C2 amplifies a drive signal output from the control circuit C1 and inputs the amplified signal to the control terminal of the power module 9. The drive circuit C2 drives the inverter 8 by switching the power semiconductors 9a and 9b of the power module 9 between an ON state and an OFF state.

[0023] Next, the structure of the rotating electrical machine unit 1 will be described with reference to FIGS. In this specification, the direction along the axis O (see FIG. 4) of the rotor 31 of the rotating electric machine 2 is referred to as the "axial direction Z." Also, the direction intersecting the axis O of the rotor 31 as viewed from the axial direction Z is referred to as the "radial direction," and the direction going around the axis O of the rotor 31 is referred to as the "circumferential direction." 1, the rotating electric machine 2 and the power conversion device 3 are aligned in the axial direction Z. In the axial direction Z, the side where the power conversion device 3 is located is referred to as the +Z side or upper side, and the side where the rotating electric machine 2 is located is referred to as the -Z side or lower side.

[0024] Fig. 4 is a cross-sectional view of the rotating electric machine 2. As shown in Fig. 4, the rotating electric machine 2 includes a rotor 31, a bracket 33 (partition member), a power supply line 34, a rotating shaft 35, a rotation detection target 36, and a motor housing 38.

[0025] The motor housing 38 is cylindrical and has a bottom. The motor housing 38 accommodates the rotor 31, the rotary shaft 35, and a stator (not shown) wound with the motor windings 32. The end of the motor housing 38 on the +Z side is closed by a bracket 33.

[0026] The rotor 31 is provided inside a motor housing 38. A magnet (not shown) is provided in the rotor 31. When a current flows through the motor windings 32, the rotor 31 is rotatable around an axis O relative to the motor housing 38.

[0027] The rotating shaft 35 is attached to the rotor 31. The rotating shaft 35 is rotatably supported by bearings (not shown) provided on the bottom of the motor housing 38 and the bracket 33. The tip 35a (end on the +Z side) of the rotating shaft 35 penetrates the bracket 33 and protrudes toward the power conversion device 3 (+Z side). In other words, the tip 35a of the rotating shaft 35 extends into the internal space of the inverter housing. This allows the rotating electrical machine unit 1 to be made smaller in the axial direction Z.

[0028] The rotation detection target 36 is attached to the tip 35a of the rotation shaft 35. The rotation detection target 36 rotates with the rotation of the rotation shaft 35. Details of the rotation detection target 36 will be described later.

[0029] The power supply line 34 is connected to an end of the motor winding 32. The power supply line 34 passes through the bracket 33 and protrudes toward the power conversion device 3 (+Z side). That is, the power supply line 34 extends to the internal space of the inverter housing 58.

[0030] The bracket 33 faces the power converter 3. The bracket 33 separates the internal space of the motor housing 38 from the internal space of the inverter housing 58. As shown in FIG. 1, a flange portion 58a that abuts against the bracket 33 is formed at the end of the inverter housing 58 on the -Z side. The bracket 33 is fixed to the flange portion 58a using fixing screws 57 (see FIG. 1). In this way, the power converter 3 is fixed to the rotating electric machine 2.

[0031] When the rotating electric machine unit 1 is driven, the rotating electric machine 2 generates heat. A cooling oil flow path (not shown) through which cooling oil flows is formed inside the motor housing 38. The cooling oil flow path is connected to an oil pump mounted on the vehicle by a piping hose. The rotating electric machine 2 can be cooled by circulating cooling oil inside the motor housing 38. The +Z side end of the motor housing 38 is closed by a bracket 33. A gasket 39 is provided between the bracket 33 and the motor housing 38. An oil seal portion 40 is provided between the rotating shaft 35 and the bracket 33. This prevents the cooling oil from leaking out of the motor housing 38.

[0032] Fig. 5 is a schematic diagram showing the power conversion device 3. In Fig. 5, a rotating shaft 35 of the rotating electric machine 2, a rotation detection target 36, and a power feeder 34 are also shown for the purpose of explaining the positional relationship with the rotating electric machine 2.

[0033] 5, inverter housing 58 accommodates control board 5, drive board 16, power module 9 (inverter 8), capacitor module 11, etc. Inside inverter housing 58, control board 5, drive board 16, and power module 9 are arranged in this order from the -Z side to the +Z side.

[0034] The power conversion device 3 has a terminal block 17 that connects the power feeder 34 and the relay bus bar 13. The power feeder 34 is inserted into the terminal block 17 and fixed with a screw (not shown). Terminal fixing holes 56 for screw fastening are formed on the side of the inverter housing 58. Note that the rotating electric machine 2 and the power conversion device 3 can be separated by removing the fixing screws 57 that fix the bracket 33 to the inverter housing 58 and the screws that fix the power feeder 34.

[0035] Current detection unit 12 has a Hall element arranged close to relay busbar 13. The Hall element is mounted on drive board 16. A magnetic flux collecting core is arranged close to relay busbar 13. Current detection unit 12 detects a magnetic field generated by a current flowing through relay busbar 13 using the Hall element, and outputs a voltage signal corresponding to the current flowing through relay busbar 13.

[0036] As shown in Fig. 6, the control board 5 has a substantially rectangular shape. The control board 5 has a first side edge 5a and a second side edge 5b that face each other. The control board 5 has a plurality of protrusions 5c that protrude from the second side edge 5b. The power supply lines 34 are arranged between the protrusions 5c. In other words, the protrusions 5c are arranged between the plurality of power supply lines 34.

[0037] The temperature detection unit 6 is disposed inside the inverter housing 58. The temperature detection unit 6 is mounted on the surface of the control board 5 facing the rotating electric machine 2 (the surface facing the -Z side). The temperature detection unit 6 includes a plurality of thermistors 22. The thermistors 22 are mounted on the protruding portions 5c of the control board 5. The thermistors 22 are connected to the control circuit C1, for example, via printed wiring formed on the control board 5. The thermistors 22 are disposed adjacent to portions of the power feed lines 34 that are disposed between the protruding portions 5c. The resistance value of the thermistors 22 varies depending on the temperature of the power feed lines 34. The thermistors 22 output a voltage value corresponding to the resistance value of the thermistors 22 to the control circuit C1. This makes it possible to detect the temperature of the power feed lines 34 (i.e., a temperature corresponding to the temperature of the motor windings 32) using the temperature detection unit 6.

[0038] In this embodiment, the thermistor 22 and the power supply line 34 (detection target) are disposed close to each other without contacting each other. Generally, when the thermistor and the detection target are disposed in a non-contact state, the thermistor must detect radiant heat from the detection target through an air gap between the thermistor and the detection target. Therefore, compared to, for example, when the thermistor and the detection target are disposed in contact and the thermistor detects conductive heat from the detection target, the temperature response of the detection target may be reduced. In particular, when the thermistor is disposed on the side edge of the control board without providing a protrusion on the control board, the temperature response of the detection target may be reduced. In this embodiment, a protrusion 5c is provided on the control board 5, and the thermistor 22 is mounted on the protrusion 5c. This allows the thermistor 22 to be disposed between two power supply lines 34 that are disposed on either side of the protrusion 5c, allowing the thermistor 22 to detect radiant heat from the two power supply lines 34. Therefore, even when the thermistor 22 and the power supply line 34 (detection target portion) are arranged in a non-contact state, it is possible to suppress a decrease in the temperature response of the power supply line 34.

[0039] The potential of the control circuit C1 of the control board 5 is approximately equal to the potential of the vehicle body. The potential difference between the potential of the power supply line 34 and the potential of the control circuit C1 of the control board 5 is approximately several hundred volts. Therefore, if the thermistor comes into contact with the power supply line, the thermistor needs to be shielded with an insulating coating that can withstand voltage, which makes the structure complicated. In this embodiment, the thermistor 22 and the power supply line 34 are arranged close to each other without contacting each other. This eliminates the need to provide an insulating coating on the thermistor 22, thereby simplifying the structure.

[0040] The rotation detection target 36 and the rotation detection unit 7 will be described with reference to FIGS. The rotation detection target 36 is made of a conductive non-magnetic metal. As shown in FIG. 7 , the rotation detection target 36 has a cylindrical mounting tube portion 36a and a plurality of terminal portions 36b protruding radially outward from the mounting tube portion 36a. The mounting tube portion 36a is attached to the tip portion 35a of the rotating shaft 35. The plurality of terminal portions 36b are arranged at equal intervals in the circumferential direction. In this embodiment, the rotation detection target 36 is made of a metal such as aluminum, copper, or stainless steel. In this case, the workability of the rotation detection target 36 is improved, and the degree of freedom in the shape of the rotation detection target 36 is increased.

[0041] The rotation detection unit 7 is disposed inside the inverter housing 58. The rotation detection unit 7 is mounted on the surface of the control board 5 facing the rotating electric machine 2 (the surface facing the -Z side). The rotation detection unit 7 is connected to the control circuit C1, for example, via printed wiring formed on the control board 5. The rotation detection unit 7 is disposed to face the rotation detection target 36 in the axial direction Z. The rotation detection target 36 and the rotation detection unit 7 are disposed close to each other. The rotation detection target 36 is not in contact with the rotation detection unit 7. The rotation detection target 36 rotates relative to the rotation detection unit 7 as the rotation shaft 35 rotates.

[0042] The rotation detection unit 7 has a pattern coil 21. The pattern coil 21 is composed of a transmitting coil 21a that generates an AC magnetic field at a constant frequency of about several MHz, and a receiving coil 21b that receives the AC magnetic field generated from the transmitting coil 21a. The receiving coil 21b faces the rotation detection target 36 in the axial direction Z. When viewed from the axial direction Z, the receiving coil 21b is disposed radially inside the rotation detection target 36. The pattern coil 21 detects the rotation speed of the rotor 31 by the receiving coil 21b receiving an electrical signal corresponding to the position of the rotation detection target 36. Specifically, in the pattern coil 21, when the AC magnetic field generated by the transmitting coil 21a interlinks with the receiving coil 21b, an induced voltage corresponding to the magnitude of the magnetic flux is generated at the end of the receiving coil 21b. When the rotation detection target 36 is disposed opposite to the receiving coil 21b, an eddy current is induced in the rotation detection target 36 by the magnetic field generated by the transmitting coil 21a, generating a magnetic field opposite to the AC magnetic field of the transmitting coil 21a and reducing the magnetic flux interlinking with the receiving coil 21b. As a result, an induced voltage synchronized with the position of the rotation detection target 36 is generated in the receiving coil 21b. The control circuit C1 detects the frequency of the induced voltage in the rotation detector 7, thereby detecting the rotation speed of the rotor 31 of the rotating electric machine 2.

[0043] When the rotating electric machine unit 1 is driven, the power conversion device 3 generates heat. A cooling refrigerant flow path (not shown) through which a cooling refrigerant flows is formed inside the inverter housing 58. The cooling refrigerant flow path is connected to a water pump mounted on the vehicle by a piping hose. The power conversion device 3 can be cooled by circulating the cooling refrigerant inside the inverter housing 58. As shown in FIG. 5 , the power module 9 is disposed on the cooling surface 18, and the cooling refrigerant flow path is formed to pass near the cooling surface 18. The heat generated in the power module 9 is transferred to the cooling surface 18 and is dissipated to the outside of the rotating electric machine unit 1 through the cooling refrigerant flowing through the cooling refrigerant flow path.

[0044] In conventional rotating electric machine units, the rotation detector and the temperature detector are provided inside the motor housing and connected to a control board housed in the inverter housing via signal lines. In this case, an opening for passing the signal lines must be provided in the partition member. Furthermore, a sealing member must be provided to close the gap between the opening in the partition member and the signal lines to prevent cooling oil for cooling the rotating electric machine from leaking outside the motor housing. This complicates the structure of the partition member, increasing the cost of the rotating electric machine unit. Furthermore, when the rotation detector and the temperature detector are provided inside the motor housing, sensors with high oil and heat resistance must be used as the rotation detector and the temperature detector, which also increases the cost of the rotating electric machine unit.

[0045] In this embodiment, the rotation detector 7 and the temperature detector 6 are disposed inside the inverter housing 58. This eliminates the need to insert signal lines connecting the rotation detector 7 and the temperature detector 6 to the control board 5 through the bracket 33. Furthermore, since it is not necessary to provide an opening in the bracket 33 for inserting the signal lines, it is also not necessary to provide a sealing member to close the gap between the opening in the bracket 33 and the signal lines. This simplifies the configuration of the bracket 33, thereby reducing the cost of the rotating electrical machine unit 1. Furthermore, compared to when the rotation detector 7 and the temperature detector are disposed inside the motor housing, it is not necessary to use highly oil-resistant and heat-resistant sensors as the rotation detector 7 and the temperature detector 6. This also reduces the cost of the rotating electrical machine unit 1.

[0046] As described above, the rotating electric machine unit 1 according to this embodiment includes a rotating electric machine 2 having a rotor 31, a rotating shaft 35 fixed to the rotor 31, a plurality of motor windings 32 that rotate the rotor 31 about an axis O when a current flows through them, a motor housing 38 that accommodates the rotor 31, and a bracket 33 that covers the motor housing 38; and a power conversion device 3 having an inverter 8 arranged alongside the rotating electric machine 2 in the axial direction Z and capable of supplying current to the plurality of motor windings 32, a control board 5 on which a control circuit C1 that controls the inverter 8 is mounted, and an inverter housing 58 that accommodates the inverter 8 and the control board 5. The bracket 33 is fixed to the inverter housing 58 and separates the interior space of the motor housing 38 from the interior space of the inverter housing 58. A tip end 35a of the rotating shaft 35 and a plurality of power feeders 34 (detection target portions) electrically connected to the tip end 35a of the rotating shaft 35 and the plurality of motor windings 32 extend into the interior space of the inverter housing 58. The power conversion device 3 has a rotation detection unit 7 arranged inside the inverter housing 58 and detecting the rotation speed of the rotor 31, and a temperature detection unit 6 arranged inside the inverter housing 58 and mounted on the control board 5 and detecting the temperature of the multiple power supply lines 34.

[0047] Because the rotation detection unit 7 and the temperature detection unit 6 are disposed inside the inverter housing 58, it is not necessary to insert signal lines connecting the rotation detection unit 7 and the temperature detection unit 6 to the control board 5 through the bracket 33. This simplifies the configuration of the bracket 33, thereby reducing the cost of the rotating electrical machine unit 1. Furthermore, because the temperature detection unit 6 is mounted on the control board 5, the temperature detection unit 6 can be connected to the control circuit C1, for example, via printed wiring formed on the control board 5, without using wiring (conductors).

[0048] The rotation detector 7 is mounted on the control board 5. According to the above configuration, the rotation detector 7 can be connected to the control circuit C1 via, for example, printed wiring formed on the control board 5 without using wiring (conductors).

[0049] The control board 5 also has a second side edge 5b and a protrusion 5c protruding from the second side edge 5b. The protrusion 5c is disposed between the plurality of power supply lines 34. The temperature detection unit 6 is mounted on the protrusion 5c of the control board 5. According to the above configuration, the temperature detection unit 6 can be used to simultaneously detect the temperatures of a plurality of power supply lines .

[0050] In the present embodiment, the power feeder 34 located between the bracket 33 and the terminal block 17 is the detection target whose temperature is detected using the temperature detection unit 6. Therefore, even if the temperature detection unit 6 is provided inside the inverter housing 58, it is possible to detect a temperature corresponding to the temperature of the motor windings 32. That is, although the relay bus bar 13 connecting the power feeder 34 and the power module 9 is also disposed inside the inverter housing 58, the relay bus bar 13 is cooled via the power module 9, and therefore it is difficult for the relay bus bar 13 to detect a temperature corresponding to the temperature of the motor windings 32.

[0051] In this embodiment, the temperature detection unit 6 (thermistor 22) and the power supply line 34 are disposed adjacent to each other without contacting each other. The rotation detection target 36 and the rotation detection unit 7 are disposed adjacent to each other without contacting each other. This eliminates the need to attach the temperature detection unit 6 to the power supply line 34 and the rotation detection unit 7 to the rotating shaft 35 when assembling the rotating electric machine 2 and the power conversion device 3, making the assembly work easier.

[0052] <Embodiment 2> Next, a rotating electrical machine unit according to embodiment 2 will be described with reference to Figures 8 and 9. The rotating electrical machine unit according to this embodiment has the same basic configuration as the rotating electrical machine unit of embodiment 1, and therefore differences will be mainly described.

[0053] As shown in FIGS. 8 and 9, in this embodiment, the power conversion device 3 further includes a rotation detection board 37 on which the rotation detection unit 7 is mounted. The temperature detection unit 6 is mounted on the control board 5. That is, the rotation detection unit 7 and the temperature detection unit 6 are mounted on different boards. The rotation detection unit 7 is mounted on the surface of the rotation detection board 37 that faces the rotating electric machine 2 (the surface facing the -Z side). The rotation detection board 37 is disposed so as to face the rotation detection target 36 in the axial direction Z.

[0054] The control board 5 and the rotation detection board 37 are arranged so that they are at different positions in the axial direction Z. The control board 5 is arranged closer to the rotor 31 (-Z side) in the axial direction Z than the rotation detection board 37. The rotation detection board 37 is supported on the control board 5 by a pillar-type spacer or the like (not shown). The rotation detection board 37 and the control board 5 are electrically connected by, for example, a board-to-board connector.

[0055] The control board 5 has a recess 5d recessed from the first side edge 5a. The tip 35a of the rotating shaft 35 is disposed in the recess 5d. This facilitates the assembly of the rotating electric machine 2 and the power conversion device 3 compared to, for example, a case in which an insertion hole for inserting the tip of the rotating shaft is provided in the control board. That is, when an insertion hole is provided in the control board, it is necessary to attach a rotation detection target to the tip of the rotating shaft after inserting the tip of the rotating shaft into the insertion hole of the control board. By providing the recess 5d, the control board 5 can be positioned relative to the rotating shaft 35 and the rotation detection target 36 via the recess 5d, with the rotation detection target 36 attached to the rotating shaft 35.

[0056] As described above, in this embodiment, the power conversion device 3 further includes the rotation detection board 37 on which the rotation detection unit 7 is mounted. The control board 5 is disposed closer to the rotor 31 in the axial direction Z than the rotation detection board 37. According to the above configuration, the control board 5 on which the temperature detection unit 6 is mounted is disposed closer to the rotor 31 than the rotation detection board 37, so that the temperature detection unit 6 can detect the temperature of the power supply line 34 at a position closer to the rotor 31. Therefore, the temperature detection unit 6 can be used to detect a temperature closer to the temperature of the motor windings 32.

[0057] The control board 5 also has a first side edge 5a and a recess 5d recessed from the first side edge 5a. The tip 35a of the rotary shaft 35 is disposed in the recess 5d. According to the above configuration, the assembly work of assembling the rotary electric machine 2 and the power converter 3 is easier than when, for example, an insertion hole for inserting the tip of the rotary shaft is provided in the control board.

[0058] <Third Embodiment> Next, a rotating electrical machine unit according to a third embodiment will be described with reference to Fig. 10. The rotating electrical machine unit according to this embodiment has the same basic configuration as the rotating electrical machine unit according to the first embodiment, and therefore differences will be mainly described.

[0059] 10, in this embodiment, the temperature detection unit 6 includes a plurality of infrared temperature sensors 23. The second side edge 5b of the control board 5 does not have a protrusion formed thereon. The infrared temperature sensor 23 is mounted on the control board 5. The infrared temperature sensor 23 is positioned so that its light-receiving surface faces the power feeder 34. The infrared temperature sensor 23 is positioned without contact with the power feeder 34. The infrared temperature sensor 23 detects the temperature of the power feeder 34 by detecting infrared energy emitted from the power feeder 34. Specifically, the infrared temperature sensor 23 includes a thermopile and a lens. The lens focuses the infrared light emitted from the power feeder 34 onto the thermopile. The thermopile receives the infrared light emitted from the power feeder 34 and generates an electromotive force corresponding to the amount of infrared light received. The control circuit C1 converts this electromotive force into a voltage and reads it to detect the temperature of the power feeder 34. Note that, in general, shiny metals such as copper have low emissivity. To increase the amount of radiant energy emitted from the power feeder 34, which is the detection target, the power feeder 34 may be painted black, for example.

[0060] As described above, in this embodiment, the temperature detection unit 6 includes a plurality of infrared temperature sensors 23 arranged to face a plurality of power supply lines 34. According to the above configuration, the temperature of the power feeder 34 can be detected in a non-contact manner by the infrared temperature sensor 23. Therefore, it is not necessary to provide an attachment mechanism for attaching the temperature detection unit 6 to the power feeder 34, an insulation mechanism for electrically insulating the power feeder 34 from the temperature detection unit 6, etc.

[0061] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0062] For example, the rotating electrical machine unit 1 may be a rotating electrical machine unit of a single three-phase drive system, or may be a rotating electrical machine unit of a multi-phase drive system with six or more phases.

[0063] In the above embodiment, the current detection unit 12 is mounted on the drive board 16 and senses the current flowing through the relay busbar 13. However, the present disclosure is not limited to this. As shown in FIG. 11 , the current detection unit 12 may be mounted on the control board 5 at a position facing the power feeder 34 (detection target portion) and detect the current flowing through the power feeder 34. The current detection unit 12 and the power feeder 34 are disposed close to each other but not in contact with each other. The current detection unit 12 is a magnetoelectric conversion type current sensor that detects the current flowing through the power feeder 34 by detecting the magnetic field M generated from the power feeder 34. According to this modification, both the thermistor 22 (temperature detection unit 6) and the current detection unit 12 are mounted on the control board 5, and the thermistor 22 can detect the temperature of the power feeder 34, and the current detection unit 12 can detect the current flowing through the power feeder 34.

[0064] In addition, the above-described embodiments and modifications may be combined as appropriate.

[0065] Various aspects of the present disclosure are summarized below as appendices.

[0066] (Appendix 1) a rotating electric machine including a rotor, a rotating shaft fixed to the rotor, a plurality of motor windings that rotate the rotor about its axis when a current flows through them, a motor housing that houses the rotor, and a partition member that closes the motor housing; a power conversion device including: an inverter arranged alongside the rotating electric machine in an axial direction along the axis center and capable of supplying current to the plurality of motor windings; a control board on which a control circuit for controlling the inverter is mounted; and an inverter housing that accommodates the inverter and the control board; Equipped with the partition member is fixed to the inverter housing and separates an internal space of the motor housing from an internal space of the inverter housing, a plurality of detection targets electrically connected to a tip end of the rotary shaft and the plurality of motor windings extend into an internal space of the inverter housing; The power conversion device is a rotation detection unit disposed inside the inverter housing and detecting a rotation speed of the rotor; a temperature detection unit disposed inside the inverter housing and mounted on the control board, the temperature detection unit detecting temperatures of the plurality of detection targets; having Rotating electric unit.

[0067] (Appendix 2) 2. The rotating electrical machine unit according to claim 1, wherein the rotation detection unit is mounted on the control board.

[0068] (Appendix 3) The power conversion device further includes a rotation detection board on which the rotation detection unit is mounted, 2. The rotating electrical unit according to claim 1, wherein the control board is arranged closer to the rotor in the axial direction than the rotation detection board.

[0069] (Appendix 4) the control board has a first side edge and a recess recessed from the first side edge; 4. The rotating electrical unit according to claim 1, wherein a tip end of the rotating shaft is disposed in the recess.

[0070] (Appendix 5) the control board has a second side edge and a protrusion protruding from the second side edge, the protrusions are disposed between the plurality of detection targets, 5. The rotating electrical unit according to claim 1, wherein the temperature detection unit is mounted on the convex portion of the control board.

[0071] (Appendix 6) The power conversion device further includes a current detection unit that detects a magnetic field generated from the detection target and detects a current flowing in the detection target, 6. The rotating electrical machine unit according to claim 5, wherein the current detection unit is mounted on the control board at a position facing the detection target unit.

[0072] (Appendix 7) 5. The rotating electrical machine unit according to claim 1, wherein the temperature detection unit includes a plurality of infrared temperature sensors arranged to face the plurality of detection target parts. [Explanation of symbols]

[0073] 1 Rotating electric unit 2 Rotating electric machines 3 Power conversion equipment 5 Control board 5a 1st side edge 5b 2nd side edge 5c Convex part 5d recess 6 Temperature detection unit 7 Rotation detection unit 8 inverters 9 Power Module 12 Current detection section 22 Thermistor 23 Infrared temperature sensor 31 Rotor 32 Motor Winding 33 Bracket (partition member) 34 Power supply line (detection target) 35 Rotation axis 35a Tip 37 Rotation detection board 38 Motor housing 58 Inverter housing C1 control circuit O axis center Z axis direction

Claims

1. a rotating electric machine including a rotor, a rotating shaft fixed to the rotor, a plurality of motor windings that rotate the rotor about its axis when a current flows through them, a motor housing that houses the rotor, and a partition member that closes the motor housing; a power conversion device including: an inverter arranged alongside the rotating electric machine in an axial direction along the axis center and capable of supplying current to the plurality of motor windings; a control board on which a control circuit for controlling the inverter is mounted; and an inverter housing that accommodates the inverter and the control board; Equipped with the partition member is fixed to the inverter housing and separates an internal space of the motor housing from an internal space of the inverter housing, a plurality of detection targets electrically connected to a tip end of the rotary shaft and the plurality of motor windings extend into an internal space of the inverter housing; The power conversion device is a rotation detection unit disposed inside the inverter housing and detecting a rotation speed of the rotor; a temperature detection unit disposed inside the inverter housing and mounted on the control board, the temperature detection unit detecting temperatures of the plurality of detection targets; having Rotating electric unit.

2. The rotating electrical machine unit according to claim 1 , wherein the rotation detector is mounted on the control board.

3. The power conversion device further includes a rotation detection board on which the rotation detection unit is mounted, The rotating electrical unit according to claim 1 , wherein the control board is disposed closer to the rotor in the axial direction than the rotation detection board.

4. the control board has a first side edge and a recess recessed from the first side edge, The rotating electrical unit according to claim 1 or 3, wherein a tip end of the rotating shaft is disposed in the recess.

5. the control board has a second side edge and a protrusion protruding from the second side edge, the protrusions are disposed between the plurality of detection targets, The rotating electrical unit according to claim 1 , wherein the temperature detection unit is mounted on the protruding portion of the control board.

6. The power conversion device further includes a current detection unit that detects a magnetic field generated from the detection target and detects a current flowing in the detection target, The rotating electrical unit according to claim 5 , wherein the current detection section is mounted on the control board at a position facing the detection target section.

7. The rotating electrical unit according to claim 1 , wherein the temperature detection section includes a plurality of infrared temperature sensors arranged to face the plurality of detection target parts.

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