Drive device

Abstract

An EPU (50) has a motor device (60), an inverter device (80), a unit case (101), and a cooling device (800). The motor device (60) has a motor (61) and a motor housing (70). The inverter device (80) has an inverter (81) and an inverter case (90). The motor (61) and the inverter (81) are housed in the unit case (101). The cooling device (800) has a refrigerant passage (810) and a refrigerant pump (801). The refrigerant pump (801) causes the refrigerant pump (801) to flow so that the refrigerant (RF) circulates in the refrigerant passage (810). The unit case (101) has liquid cooling fins (835) that release heat of a refrigerant (RF) to the outside. The liquid cooling fins (835) are provided on the cell outer surfaces (101os).

Description

Citation of related applications

[0001] This application is based on patent application No. 2022-139555 filed in Japan on September 1, 2022, and the contents of the basic application are cited as a reference in their entirety. Technical Field

[0002] The disclosure in this specification relates to a drive device. Background Art

[0003] Patent document 1 describes a drive device for driving an aircraft to fly. The drive device includes a motor, an inverter, and a housing. The motor and the inverter are accommodated in the housing. In the drive device, air or liquid is used to cool the motor or the inverter. Patent document 1 is configured to facilitate replacement of the drive device in the aircraft. Prior art literature Patent Literature

[0004] Patent Document 1: U.S. Patent Application Publication No. 2021 / 0276707 Summary of the invention

[0005] However, in Patent Document 1, the output density of the drive device may be reduced due to the structure that facilitates replacement of the drive device. The output density is, for example, the output per unit mass.

[0006] An object of the present disclosure is to provide a driving device capable of improving output density.

[0007] The various embodiments disclosed in this specification use different technical means to achieve each purpose. In addition, the claims and the symbols in parentheses described therein are examples of the correspondence relationship with the specific elements described in the embodiment described later as one embodiment, and do not limit the technical scope.

[0008] In order to achieve the above object, the disclosed method is a driving device, The driving device is driven by electricity, wherein the driving device comprises: a motor device having a motor supplied with electric power; an inverter device including an inverter for converting electric power supplied to the electric motor; A housing housing for housing at least one of the motor and the inverter; a cooling device including a refrigerant passage through which a refrigerant circulates and a refrigerant pump for causing the refrigerant to flow through the refrigerant passage, and cooling the interior of the housing casing by the refrigerant flowing through the refrigerant passage; and The refrigerant fin is provided on the outer surface of the housing case, which is the outer surface of the housing case, and releases heat of the refrigerant.

[0009] According to the above-mentioned method, the interior of the housing shell is cooled by the refrigerant circulating in the refrigerant passage. In this structure, the temperature rise of the motor or the inverter can be suppressed by the refrigerant inside the housing shell. Therefore, it is difficult to produce a situation where the output of the motor or the inverter, such as the current, is reduced. In addition, the heat of the refrigerant is released to the outside by the refrigerant fins provided on the outer surface of the housing shell. In this structure, the cooling effect of the refrigerant on cooling the motor or the inverter can be improved by the refrigerant fins. Therefore, the output density of the drive device can be increased by the refrigerant fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a longitudinal sectional view of the EPU in the first embodiment. Figure 2 It is a schematic longitudinal cross-sectional view of the EPU. Figure 3 is a cross-sectional view of an inverter device. Figure 4 is a schematic cross-sectional view of the motor device. Figure 5 It is a diagram showing the structure of an eVTOL. Figure 6 It is a diagram showing the electrical structure of the drive system. Figure 7 It is a schematic longitudinal sectional view of the EPU in the second embodiment. Figure 8 It is a schematic longitudinal sectional view of the EPU in the third embodiment. Fig. 9 It is a schematic longitudinal sectional view of the EPU in the fourth embodiment. Fig.10 It is a schematic longitudinal sectional view of the EPU in the fifth embodiment. Fig.11 It is a schematic longitudinal sectional view of the EPU in the sixth embodiment. Fig.12 It is a schematic longitudinal sectional view of the EPU in the seventh embodiment. Fig.13 It is a schematic longitudinal sectional view of the EPU in the eighth embodiment. Fig.14 It is a schematic longitudinal sectional view of the EPU in the ninth embodiment. Fig.15 is a schematic cross-sectional view of the EPU. Fig.16It is a schematic cross-sectional view of the EPU in the tenth embodiment. Fig.17 It is a schematic longitudinal sectional view of the EPU in the eleventh embodiment. Fig.18 is a schematic cross-sectional view of the EPU. Fig.19 It is a schematic longitudinal sectional view of the EPU in the twelfth embodiment. Fig. 20 is a cross-sectional view of an inverter device. Fig.21 It is a schematic longitudinal sectional view of the EPU in the thirteenth embodiment. Fig. 22 is a cross-sectional view of an inverter device. Fig.23 It is a schematic longitudinal sectional view of the EPU in the fourteenth embodiment. Fig.24 It is a schematic longitudinal cross-sectional view of the EPU. Fig.25 It is a cross-sectional view of the inverter device in the fifteenth embodiment. DETAILED DESCRIPTION

[0011] Hereinafter, with reference to the accompanying drawings, a plurality of methods for implementing the present disclosure will be described. In each method, sometimes the same reference numerals are marked on the parts corresponding to the matters described in the previous method, and repeated descriptions are omitted. In the case where only a part of the structure is described in each method, other methods previously described can be applied to the other parts of the structure. Not only are the combinations of the parts that can be combined specifically and clearly recorded in each embodiment, but as long as there is no obstacle to the combination, the embodiments can also be partially combined even if not clearly recorded.

[0012] <First embodiment> Figure 5 The drive system 30 shown is installed in the eVTOL 10. The eVTOL 10 is an electric vertical take-off and landing aircraft that can take off and land in the vertical direction. eVTOL is the abbreviation of electric Vertical Take-Off and Landing aircraft. The eVTOL 10 is an aircraft that flies in the atmosphere, which is equivalent to a flying object. The eVTOL 10 is also an electric electric aircraft, sometimes referred to as an electric flying object. The eVTOL 10 is a manned aircraft with passengers on board. The drive system 30 is a system for driving the eVTOL 10 to fly.

[0013] The eVTOL 10 has a fuselage 11 and propellers 20. The fuselage 11 has a fuselage main body 12 and wings 13. The fuselage main body 12 is the body of the fuselage 11 and is, for example, shaped to extend in the front-rear direction. The fuselage main body 12 has a passenger compartment for passengers to ride in. The wings 13 extend from the fuselage main body 12, and a plurality of wings 13 are provided on the fuselage main body 12. The wings 13 are fixed wings. The plurality of wings 13 include main wings, tail wings, and the like.

[0014] A plurality of propellers 20 are provided on the fuselage 11. The eVTOL 10 is a multi-propeller aircraft (Japanese: マルチコプタ) having at least three propellers 20. For example, at least four propellers 20 are provided on the fuselage 11. The propellers 20 are respectively provided on the fuselage main body 12 and the wings 13. The propellers 20 rotate about a propeller axis. The propeller axis is, for example, the center line of the propeller 20. The propellers 20 can cause the eVTOL 10 to generate thrust and lift. In addition, the propellers 20 are sometimes referred to as rotors or rotary wings.

[0015] The propeller 20 has blades 21 and a propeller head 22. A plurality of blades 21 are arranged in the circumferential direction of the propeller axis. The propeller head 22 connects the plurality of blades 21. The blades 21 extend radially from the propeller head 22 along the propeller axis. The propeller 20 has a propeller shaft (not shown). The propeller shaft is the rotation axis of the propeller 20 and extends along the propeller axis from the propeller head 22. The propeller shaft is sometimes referred to as a propulsion shaft.

[0016] The eVTOL 10 is a tilt-rotor aircraft (Japanese: チルトロータ機). In the eVTOL 10, the propellers 20 can be tilted. That is, the pitch angle of the propellers 20 can be adjusted. For example, when the eVTOL 10 ascends, the orientation of the propellers 20 is set such that the propeller axes extend in the up-down direction. In this case, the propellers 20 function as lifting rotors for causing the eVTOL 10 to generate lift. By the propellers 20 functioning as lifting rotors, hovering and vertical takeoff and landing of the eVTOL 10 can be achieved. When the eVTOL 10 moves forward, the orientation of the propellers 20 is set such that the propeller axes extend in the front-rear direction. In this case, the propellers 20 function as cruising rotors for causing the eVTOL 10 to generate thrust.

[0017] The eVTOL 10 has a battery 31, a distributor 32, a flight control device 40, and an EPU 50. The battery 31, the distributor 32, the flight control device 40, and the EPU 50 are included in the drive system 30. The battery 31 is connected to a plurality of EPUs 50 in a manner that allows power to be supplied. The battery 31 is a power supply unit that supplies power to the EDS 50, and is equivalent to a power supply unit. The battery 31 is a DC voltage source that applies a DC voltage to the EDS 50. The battery 31 has a secondary battery that can be charged and discharged. The battery 31 also supplies power to the flight control device 40. In addition, as a power supply unit, in addition to or instead of the battery 31, a fuel cell or a generator may be used.

[0018] The distributor 32 is electrically connected to the battery 31 and the plurality of EPUs 50. The distributor 32 distributes the power from the battery 31 to the plurality of EPUs 50. The power distributed to the EPUs 50 by the distributor 32 is driving power for driving the EPUs 50.

[0019] The flight control device 40 controls the drive system 30. The flight control device 40 performs flight control for making the eVTOL 10 fly. The flight control device 40 is connected to a plurality of EPUs 50 in a communicable manner. The flight control device 40 controls the plurality of EPUs 50 individually. The flight control device 40 controls the EPUs 50 via a control circuit 160 described later. The flight control device 40 controls the control circuit 160.

[0020] EPU 50 is a device for driving the propeller 20 to rotate, which is equivalent to a drive device. EPU is the abbreviation of Electric Propulsion Unit. EPU 50 is sometimes called an electric drive device or an electric drive system. EPU 50 is provided separately for each of the plurality of propellers 20. EPU 50 is arranged along the propeller axis on the propeller 20. A plurality of EPUs 50 are fixed to the fuselage 11. EPU 50 supports the propeller 20 in a rotatable manner. EPU 50 is connected to the propeller 20. The propeller 20 is fixed to the fuselage 11 via EPU 50. When the pitch angle of the propeller 20 is changed, the angle of EPU 50 also changes.

[0021] The eVTOL 10 has a propulsion device 15. The propulsion device 15 is a device for propelling the eVTOL 10. The eVTOL 10 can fly, such as taking off, by being propelled by the propulsion device 15. The propulsion device 15 has a propeller 20 and an EPU 50. In the propulsion device 15, the propeller 20 rotates as the EPU 50 is driven. The propeller 20 is equivalent to a rotating body. The eVTOL 10 flies by the rotation of the propeller 20. That is, the eVTOL 10 moves by the rotation of the propeller 20. The eVTOL 10 is equivalent to a moving body.

[0022] like Figure 5 , Figure 6 As shown, the EPU 50 includes a motor device 60 and an inverter device 80. For example, the EPU 50 includes one motor device 60 and one inverter device 80. The motor device 60 includes a motor 61. The inverter device 80 includes an inverter 81. The motor 61 is connected to the battery 31 via the inverter 81 in an energizable manner. The motor 61 is driven by the power supplied from the battery 31 via the inverter 81.

[0023] The motor 61 is a multi-phase AC motor. The motor 61 is, for example, a three-phase AC motor having a U phase, a V phase, and a W phase. The motor 61 is a moving drive source for moving a moving body and functions as a motor. As the motor 61, for example, a brushless motor is used. The motor 61 functions as a generator during regeneration. The motor 61 has a multi-phase motor coil 211 (see Figure 1 ). The motor coil 211 is a winding and forms an armature. The motor coil 211 is provided in the U phase, the V phase, and the W phase. In addition, the motor 61 is equivalent to a rotary electric machine, and the EPU 50 is equivalent to a rotary electric machine unit.

[0024] exist Figure 6 In the embodiment of the present invention, the inverter 81 drives the motor 61 by converting the power supplied to the motor 61. The inverter 81 converts the power supplied to the motor 61 from direct current to alternating current. The inverter 81 is a power conversion unit that converts power. The inverter 81 is a multi-phase power conversion unit that performs power conversion for each of the multiple phases. The inverter 81 is, for example, a three-phase inverter that performs power conversion for each of the U phase, the V phase, and the W phase. The inverter device 80 is sometimes referred to as a power conversion device.

[0025] The inverter device 80 has a P line 141 and an N line 142. The P line 141 and the N line 142 electrically connect the battery 31 and the inverter 81. The P line 141 is electrically connected to the positive electrode of the battery 31. The N line 142 is electrically connected to the negative electrode of the battery 31. In the battery 31, the positive electrode is an electrode on the high potential side, and the negative electrode is an electrode on the low potential side. The P line 141 and the N line 142 are power lines for supplying electric power. The P line 141 is a power line on the high potential side, and is sometimes referred to as a high potential line. The N line 142 is a power line on the low potential side, and is sometimes referred to as a low potential line.

[0026] The EPU 50 has an output line 143. The output line 143 is a power line for supplying power to the motor 61. The output line 143 electrically connects the motor 61 and the inverter 81. The output line 143 is provided between the motor device 60 and the inverter device 80.

[0027] The inverter device 80 includes a smoothing capacitor 145 and an EMI filter 150. The smoothing capacitor 145 is a capacitor that smoothes the DC voltage supplied from the battery 31. The smoothing capacitor 145 is connected to the P line 141 and the N line 142 between the battery 31 and the inverter 81. The smoothing capacitor 145 is connected in parallel with the inverter 81.

[0028] EMI filter 150 is a filter circuit that reduces electromagnetic noise. EMI filter 150 is connected to P line 141 and N line 142 between battery 31 and inverter 81. EMI filter 150 is connected in parallel with smoothing capacitor 145 and inverter 81, for example.

[0029] The EMI filter 150 includes a common mode coil 151, a normal mode coil 152, a Y capacitor 153, an X capacitor 154, and a varistor 155. The common mode coil 151 is a common mode choke coil that can reduce common mode noise. The normal mode coil 152 is a normal mode choke coil that can reduce normal mode noise. The Y capacitor 153 is a line bypass capacitor that can reduce common mode noise. The X capacitor 154 is a passive capacitor that can reduce normal mode noise. The varistor 155 can absorb surge voltage and reduce the surge voltage. In addition, the Y capacitor 153 and the varistor 155 are grounded to the ground GND.

[0030] The inverter 81 is a power conversion circuit, for example, a DC-AC conversion circuit. The inverter 81 has a plurality of corresponding upper and lower arm circuits 83. For example, the inverter 81 has upper and lower arm circuits 83 for the U phase, the V phase, and the W phase, respectively. The upper and lower arm circuits 83 are sometimes referred to as bridge branches or arm circuits. The upper and lower arm circuits 83 have an upper arm 84 and a lower arm 85. The upper arm 84 and the lower arm 85 are connected in series with the battery 31. The upper arm 84 is connected to the P line 141, and the lower arm 85 is connected to the N line 142.

[0031] The output line 143 is connected to the upper and lower arm circuits 83 for each of the multiple phases. The output line 143 is connected between the upper arm 84 and the lower arm 85. The output line 143 connects the upper and lower arm circuits 83 to the coil in each of the multiple phases. The output line 143 is connected to the side opposite to the neutral point in the coil.

[0032] The upper arm 84 and the lower arm 85 have an arm switch 86 and a diode 87. The arm switch 86 is, for example, a transistor such as a MOSFET. MOSFET is the abbreviation of a power field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor). The arm switch 86 is a switching element that can convert power by switching. The switching element can be a semiconductor element such as a power element. The arm switch 86 is a conversion switch for converting power.

[0033] In the upper arm 84, the drain of the arm switch 86 is connected to the P line 141. In the lower arm 85, the source of the arm switch 86 is connected to the N line 142. Moreover, the source of the arm switch 86 in the upper arm 84 and the drain of the arm switch 86 in the lower arm 85 are connected to each other. In each of the upper arm 84 and the lower arm 85, a diode 87 is connected in reverse parallel to the arm switch 86 for reflux. The anode of the diode 87 is connected to the source of the corresponding arm switch 86, and the cathode is connected to the drain. In addition, the arm switch 86 can also be called a semiconductor switch.

[0034] The upper arm 84 and the lower arm 85 each have a plurality of arm switches 86 and a plurality of diodes 87. In each of the upper arm 84 and the lower arm 85, a plurality of arm switches 86 are connected in parallel, and a plurality of diodes 87 are connected in parallel. In the arms 84 and 85, one arm switch 86 and one diode 87 are set as one group, and a plurality of groups are connected in parallel. For example, in each of the upper arm 84 and the lower arm 85, six arm switches 86 and six diodes 87 are connected in parallel, respectively.

[0035] The EPU 50 includes a control circuit 160 and a drive circuit 161. The control circuit 160 and the drive circuit 161 are included in the inverter device 80. The control circuit 160 controls the drive of the inverter 81. The control circuit 160 controls the drive of the motor 61 via the inverter 81. The control circuit 160 is sometimes referred to as a motor control unit. Figure 6 In the figure, the control circuit 160 is illustrated as CD, the drive circuit 161 is illustrated as DD, and the motor 61 is illustrated as MG.

[0036] The control circuit 160 is a control device such as an ECU. ECU is the abbreviation of an electronic control unit. The control circuit 160 is mainly composed of a microcomputer including a processor, a memory, an I / O, and a bus connecting them. The memory is a non-transitory physical recording medium that non-temporarily stores programs and data that can be read by a computer. In addition, the non-transitory physical recording medium is a non-transitory tangible storage medium (non-transitory tangible storage medium), which is implemented by a semiconductor memory or a magnetic disk.

[0037] The control circuit 160 performs various processes related to the driving of the inverter 81 by executing the control program stored in the memory. The control circuit 160 is electrically connected to an external device, the inverter 81, and various sensors. The external device is, for example, a host ECU such as an integrated ECU installed on a mobile body. Various sensors are provided, for example, in the EPU 50. The control circuit 160 controls the inverter 81 by outputting a command signal to the inverter 81. The control circuit 160 generates a command signal based on a control signal input from an external device and a detection signal input from various sensors. The control circuit 160 controls the inverter 81 via the drive circuit 161. The control circuit 160 causes the inverter 81 to perform power conversion.

[0038] The drive circuit 161 is electrically connected to each of the plurality of arm switches 86 of the inverter 81. The drive circuit 161 drives the inverter 81 according to the command signal from the control circuit 160. The drive circuit 161 drives the arm switch 86 by applying a drive voltage corresponding to the command signal to the gate of the arm switch 86. The drive circuit 161 can drive the arm switch 86 to turn on and off. The drive circuit 161 is sometimes referred to as a driver.

[0039] The inverter device 80 has a motor current sensor 146 and a battery current sensor 147. The motor current sensor 146 detects the current flowing through the motor 61. The motor current sensor 146 is provided for the output line 143. The motor current sensor 146 detects the current flowing to the motor 61 via the output line 143. The motor current sensor 146 is provided for the U phase, the V phase, and the W phase, for example. The motor current sensor 146 is electrically connected to the control circuit 160, and outputs a detection signal to the control circuit 160.

[0040] The battery current sensor 147 detects the current flowing through the battery 31. The battery current sensor 147 is provided for the P line 141. The battery current sensor 147 detects the current flowing from the battery 31 to the inverter 81 via the P line 141. The battery current sensor 147 is electrically connected to the control circuit 160, and outputs a detection signal to the control circuit 160.

[0041] like Figure 1 As shown, the EPU 50 has an EPU shaft 51. The EPU shaft 51 connects the motor 61 to the propeller 20. The EPU shaft 51 rotates together with the propeller 20 as the motor 61 is driven. The EPU shaft 51 rotates around the EPU axis Cepu. The EPU axis Cepu is the center line of the EPU shaft 51. The EPU axis Cepu is consistent with the propeller axis.

[0042] In the propulsion device 15, the propeller 20 and the EPU 50 are arranged along the EPU axis Cepu. In the propulsion device 15, propeller wind is generated as the propeller 20 rotates. The propeller wind is a gas such as air that flows from the propeller 20 toward the EPU 50 and along the EPU axis Cepu. The propeller wind is equivalent to the rotating wind. The EPU 50 is located at a position on the leeward side of the propeller wind than the propeller 20.

[0043] In the EPU 50, the motor device 60 and the inverter device 80 are arranged along the motor axis Cm and in the axial direction AD. The motor device 60 is located on the upwind side of the propeller wind relative to the inverter device 80. The motor device 60 is arranged between the propeller 20 and the inverter device 80 in the axial direction AD. The motor axis Cm is the center line of the motor 61 and is an imaginary line extending in a straight line. The motor axis Cm is equivalent to the rotation axis. The axial direction AD is the direction in which the motor axis Cm extends.

[0044] With respect to the motor axis Cm, the axial direction AD, the radial direction RD, and the circumferential direction CD are orthogonal to each other. The circumferential direction CD is the rotation direction of the motor 61. With respect to the radial direction RD, the outer side is sometimes referred to as the radial outer side or the outer peripheral side, and the inner side is sometimes referred to as the radial inner side or the inner peripheral side. The motor axis Cm is consistent with the EPU axis Cepu. In addition, the motor axis Cm may also be located at a position offset from the EPU axis Cepu along the radial direction RD. Figure 1 A longitudinal section of the EPU 50 cut along the motor axis Cm is shown.

[0045] The EPU 50 includes a motor unit 100. The motor unit 100 includes a motor device 60 and an inverter device 80. In the motor unit 100, the motor device 60 and the inverter device 80 are integrally formed into a unit. Figure 3The cross section of the inverter device 80 cut at right angles to the motor axis Cm is shown. Figure 4 The cross section of the motor device 60 cut at right angles to the motor axis Cm is shown.

[0046] The motor unit 100 has a unit housing 101. The unit housing 101 accommodates the motor 61 and the inverter 81. The unit housing 101 is formed in a cylindrical shape as a whole, and extends in the axial direction AD along the motor axis Cm. In the motor unit 100, the motor device 60 and the inverter device 80 are integrated by accommodating the motor 61 and the inverter 81 in the unit housing 101. The unit housing 101 is equivalent to a housing housing.

[0047] The unit casing 101 has a unit outer surface 101os and a unit inner surface 101is. The unit outer surface 101os is the outer surface of the unit casing 101. The unit inner surface 101is is the inner surface of the unit casing 101. The unit outer surface 101os and the unit inner surface 101is are formed by the wall portion of the unit casing 101. The unit outer surface 101os corresponds to the outer surface of the housing casing.

[0048] The motor unit 100 has a unit upstream wall surface 101a, a unit downstream wall surface 101b, and a unit peripheral wall surface 101c. The walls 101a to 101c are included in the unit outer surface 101os. The unit upstream wall surface 101a and the unit downstream wall surface 101b extend in a direction orthogonal to the motor axis Cm. The unit upstream wall surface 101a faces the upstream side of the propeller wind. The unit downstream wall surface 101b faces the downstream side of the propeller wind. The unit peripheral wall surface 101c extends in a direction orthogonal to the radial direction RD. The propeller wind easily flows along the unit peripheral wall surface 101c and in the axial direction AD.

[0049] The unit housing 101 has a unit peripheral wall 105, an upstream plate 106, a downstream plate 107 and a partition plate 108. The unit peripheral wall 105 and the plates 106 to 108 are formed of a metal material and have thermal conductivity. The unit peripheral wall 105 forms a unit peripheral wall surface 101c. The unit peripheral wall 105 extends in an annular shape in the circumferential direction CD. The upstream plate 106 forms a unit upstream wall surface 101a. The downstream plate 107 forms a unit downstream wall surface 101b. The upstream plate 106 and the downstream plate 107 extend in a plate shape in a direction orthogonal to the axial direction AD. The unit peripheral wall 105 is in a state of being bridged on the upstream plate 106 and the downstream plate 107.

[0050] The unit housing 101 has a unit space 102. The unit space 102 is an internal space of the unit housing 101. A partition plate 108 is provided inside the unit housing 101. The partition plate 108 extends in a direction orthogonal to the axial direction AD. The partition plate 108 partitions the unit space 102 in a manner of being divided in the axial direction AD. The partition plate 108 is provided between the upstream plate 106 and the downstream plate 107. The partition plate 108 is located at a position away from any one of the upstream plate 106 and the downstream plate 107 in the axial direction AD.

[0051] The plates 106 to 108 are independent members of the unit peripheral wall 105. The plates 106 to 108 are fixed to the unit peripheral wall 105 by bolts or welding. That is, the plates 106 to 108 are post-installed on the unit peripheral wall 105. In addition, one of the plates 106 to 108 and the unit peripheral wall 105 may be integrally formed. For example, the partition plate 108 and the unit peripheral wall 105 may be integrally formed.

[0052] The unit housing 101 has a unit inner wall surface 105a. The unit inner wall surface 105a is included in the inner surface of the unit housing 101. The unit inner wall surface 105a is formed by the unit outer peripheral wall 105. Of the pair of wall surfaces of the unit outer peripheral wall 105, the wall surface facing radially inward is the unit inner wall surface 105a, and the wall surface facing radially outward is the unit outer peripheral wall surface 101c.

[0053] The motor device 60 includes a motor housing 70 in addition to the motor 61. The motor housing 70 accommodates the motor 61. The motor housing 70 includes a motor space 74. The motor space 74 is an internal space of the motor housing 70. The motor space 74 is a space for accommodating the motor 61. The motor housing 70 includes a motor peripheral wall 71. The motor peripheral wall 71 extends in a ring shape in the circumferential direction CD. The motor space 74 is an inner space of the motor peripheral wall 71. The motor 61 is accommodated inside the motor peripheral wall 71.

[0054] The motor housing 70 has a motor upstream wall 78 and a motor downstream wall 79. The motor upstream wall 78 and the motor downstream wall 79 extend in a direction orthogonal to the axial direction AD. The motor upstream wall 78 and the motor downstream wall 79 are arranged in the axial direction AD across the motor outer peripheral wall 71. The motor upstream wall 78 is arranged on the upwind side of the propeller wind relative to the motor downstream wall 79. The motor upstream wall 78 is formed by including at least a part of the upstream plate 106. The motor downstream wall 79 is formed by including at least a part of the partition plate 108.

[0055] The motor housing 70 has a motor housing outer surface 70os and a motor housing inner surface 70is. The motor housing outer surface 70os is the outer surface of the motor housing 70. The motor housing inner surface 70is is the inner surface of the motor housing 70. The motor housing outer surface 70os and the motor housing inner surface 70is are formed by the motor peripheral wall 71, the motor upstream wall 78 and the motor downstream wall 79.

[0056] The inverter device 80 has an inverter housing 90 in addition to the inverter 81. The inverter housing 90 accommodates the inverter 81. The inverter housing 90 has an inverter space 94. The inverter space 94 is an internal space of the inverter housing 90. The inverter space 94 is a space for accommodating the inverter 81. The inverter housing 90 has an inverter peripheral wall 91. The inverter peripheral wall 91 extends in a ring shape in the circumferential direction CD. The inverter space 94 is an inner space of the inverter peripheral wall 91. The inverter 81 is accommodated inside the inverter peripheral wall 91.

[0057] The inverter housing 90 has an inverter upstream wall 98 and an inverter downstream wall 99. The inverter upstream wall 98 and the inverter downstream wall 99 extend in a direction orthogonal to the axial direction AD. The inverter upstream wall 98 and the inverter downstream wall 99 are arranged in the axial direction AD across the inverter peripheral wall 91. The inverter upstream wall 98 is arranged on the upwind side of the propeller wind relative to the inverter downstream wall 99. The inverter upstream wall 98 is formed by including at least a portion of the partition plate 108. The inverter downstream wall 99 is formed by including at least a portion of the downstream plate 107.

[0058] The inverter housing 90 has an inverter housing outer surface 90os and an inverter housing inner surface 90is. The inverter housing outer surface 90os is the outer surface of the inverter housing 90. The inverter housing inner surface 90is is the inner surface of the inverter housing 90. The inverter housing outer surface 90os and the inverter housing inner surface 90is are formed by the inverter peripheral wall 91, the inverter upstream wall 98 and the inverter downstream wall 99.

[0059] In the unit housing 101, the motor housing 70 and the inverter housing 90 are integrated. The motor housing 70 and the inverter housing 90 are included in the unit housing 101. For example, the motor peripheral wall 71 and the inverter peripheral wall 91 are included in the unit peripheral wall 105. In addition, the unit outer surface 101os includes the motor housing outer surface 70os and the inverter housing outer surface 90os. The unit inner surface 101is includes the motor housing inner surface 70is and the inverter housing inner surface 90is.

[0060] In the unit housing 101, the motor housing 70 and the inverter housing 90 are arranged in the axial direction AD. The inverter housing 90 is located on the leeward side of the propeller wind relative to the motor housing 70. For example, in the unit peripheral wall 105, the motor housing 70 is located on the upwind side, and the inverter housing 90 is located on the leeward side.

[0061] In the unit housing 101, the part forming the motor space 74 is the motor housing 70. For example, in the unit housing 101, the motor peripheral wall 71, the upstream plate 106 and the partition plate 108 form the motor housing 70. The motor housing 70 has a motor upstream wall surface 70a, a motor peripheral wall surface 70c and a motor inner wall surface 71a. The motor upstream wall surface 70a and the motor peripheral wall surface 70c are included in the motor housing outer surface 70os. The motor inner wall surface 71a is included in the motor housing inner surface 70is. The motor inner wall surface 71a is the inner wall surface of the motor housing 70.

[0062] The motor upstream wall surface 70a is included in the unit upstream wall surface 101a. The motor outer peripheral wall surface 70c is included in the unit outer peripheral wall surface 101c. The motor inner wall surface 71a is included in the unit inner wall surface 105a. The motor outer peripheral wall surface 70c and the motor inner wall surface 71a are formed by the motor outer peripheral wall 71.

[0063] In the unit housing 101, the part forming the inverter space 94 is the inverter housing 90. For example, in the unit housing 101, the inverter peripheral wall 91, the downstream plate 107 and the partition plate 108 form the inverter housing 90. The inverter housing 90 has an inverter downstream wall surface 90b, an inverter peripheral wall surface 90c and an inverter inner wall surface 91a. The inverter downstream wall surface 90b and the inverter peripheral wall surface 90c are included in the inverter housing outer surface 90os. The inverter inner wall surface 91a is included in the inverter housing inner surface 90is. The inverter inner wall surface 91a is the inner wall surface of the inverter housing 90.

[0064] In addition, the inverter downstream wall surface 90b is included in the unit downstream wall surface 101b. The inverter outer peripheral wall surface 90c is included in the unit outer peripheral wall surface 101c. The inverter inner wall surface 91a is included in the unit inner wall surface 105a. The inverter outer peripheral wall surface 90c and the inverter inner wall surface 91a are formed by the inverter outer peripheral wall 91. The inverter inner wall surface 91a is equivalent to the inner wall surface.

[0065] The motor space 74 and the inverter space 94 are arranged in the axial direction AD. The partition plate 108 is located between the motor space 74 and the inverter space 94. The motor space 74 and the inverter space 94 are separated by the partition plate 108. The motor space 74 is a space between the upstream plate 106 and the partition plate 108. The inverter space 94 is a space between the downstream plate 107 and the partition plate 108.

[0066] The motor 61 includes a stator 200, a first rotor 300a, a second rotor 300b, and a motor shaft 340. The stator 200 is a fixed part. The stator 200 includes a motor coil 211 and a coil protection portion 250. The motor coil 211 extends along the motor inner wall surface 71a and in the circumferential direction CD. The motor coil 211 is formed into a ring shape as a whole. The motor coil 211 is equivalent to a coil.

[0067] The coil protection part 250 protects the motor coil 211. The coil protection part 250 is formed of a resin material or the like. The coil protection part 250 is fixed to the motor housing 70 in a state of covering the motor coil 211. For example, the coil protection part 250 is in a state of being closely attached to the inner wall surface 71a of the motor. The coil protection part 250 has thermal conductivity. The coil protection part 250 easily transfers the heat of the motor coil 211 to the motor housing 70.

[0068] The rotors 300a and 300b are rotating parts. The rotors 300a and 300b rotate relative to the stator 200. The rotors 300a and 300b rotate around the motor axis Cm. The motor axis Cm is the center line of the rotors 300a and 300b. The stator 200 and the motor coil extend in a ring shape in the circumferential direction CD. The center line of the stator 200 coincides with the motor axis Cm.

[0069] The motor device 60 is an axial gap type rotating electrical machine. The motor 61 is an axial gap type electric motor. In the motor 61, the stator 200 and the rotors 300a, 300b are arranged along the motor axis Cm and in the axial direction AD. The motor device 60 is a dual-rotor type rotating electrical machine. The motor 61 is a dual-rotor type electric motor. The first rotor 300a and the second rotor 300b are arranged in the axial direction AD. The stator 200 is arranged between the first rotor 300a and the second rotor 300b. The stator 200 is located at a position offset from the rotors 300a, 300b in the axial direction AD. The motor 61 of this embodiment is sometimes referred to as a dual-axis motor.

[0070] In the axial direction AD, the first rotor 300a is provided on the upstream plate 106 side. The first rotor 300a is located at a position away from the upstream plate 106 to the partition plate 108 side. The first rotor 300a extends in the circumferential direction CD along the upstream plate 106. In the axial direction AD, the second rotor 300b is provided on the partition plate 108 side. The second rotor 300b is located at a position away from the partition plate 108 to the upstream plate 106 side. The second rotor 300b extends in the circumferential direction CD along the partition plate 108. The rotors 300a and 300b are located at positions away from the motor outer peripheral wall 71 to the radial inside.

[0071] The motor shaft 340 supports the rotors 300a and 300b. The motor shaft 340 rotates together with the rotors 300a and 300b around the motor axis Cm. The center line of the motor shaft 340 coincides with the motor axis Cm. The motor shaft 340 connects the rotors 300a and 300b to the EPU shaft 51. The motor shaft 340 and the EPU shaft 51 are arranged in the axial direction AD. The center line of the motor shaft 340 coincides with the EPU axis Cepu. In addition, the center line of the motor shaft 340 may be located at a position deviated from the EPU axis Cepu in the radial direction RD.

[0072] The motor shaft 340 includes a shaft body 341 and a shaft flange 342. The shaft body 341 is formed in a cylindrical shape and extends in the axial direction AD along the motor axis Cm. The shaft flange 342 extends radially outward from the shaft body 341. The shaft flange 342 is fixed to the rotors 300a and 300b. The shaft flange 342 divides the motor space 74 in the axial direction AD. The rotors 300a and 300b are located at a position away from the shaft body 341 in the radial direction.

[0073] The rotors 300a and 300b have magnets 310 and magnet holders 320. Multiple magnets 310 are arranged in the circumferential direction CD in the rotors 300a and 300b, respectively. The magnets 310 are permanent magnets and are formed openly. The magnets 310 of the first rotor 300a and the magnets 310 of the second rotor 300b are arranged in the axial direction AD across the stator 200. The rotors 300a and 300b are arranged so that the magnets 310 are arranged side by side with the motor coils 211 in the axial direction AD. The magnet holders 320 support the magnets 310. The magnet holders 320 form the outer contours of the rotors 300a and 300b as a whole. The magnet holders 320 are fixed to the shaft flange 342.

[0074] The motor device 60 includes an upstream bearing 360 and a downstream bearing 361. The bearings 360 and 361 rotatably support the motor shaft 340. The upstream bearing 360 and the downstream bearing 361 are arranged in the axial direction AD with the shaft flange 342 interposed therebetween. The upstream bearing 360 is fixed to the upstream plate 106. The downstream bearing 361 is fixed to the downstream plate 107.

[0075] In the motor device 60, at least a part of the motor 61 is accommodated in the motor space 74. The motor space 74 accommodates the rotors 300a, 300b, the stator 200, and the bearings 360, 361. In addition, the motor space 74 accommodates at least a part of the motor shaft 340.

[0076] The inverter device 80 includes a drive substrate 510, a filter component 524, an arm switch unit 530, a control substrate 550, and a smoothing capacitor unit 580. The drive substrate 510, the filter component 524, the arm switch unit 530, the control substrate 550, and the smoothing capacitor 145 are housed in an inverter housing 90. The drive substrate 510, the arm switch unit 530, etc. form the inverter 81. A microcomputer 165 is mounted on the control substrate 550. The control substrate 550, the microcomputer 165, etc. form the control circuit 160.

[0077] The drive substrate 510 and the control substrate 550 are formed in a plate shape and extend in a direction orthogonal to the axial direction AD. The drive substrate 510 and the control substrate 550 are circuit substrates having a wiring pattern and the like. The drive substrate 510 and the control substrate 550 are arranged along the axial direction AD. The control substrate 550 is located between the drive substrate 510 and the downstream plate 107. In the axial direction AD, the distance between the drive substrate 510 and the control substrate 550 is smaller than the distance between the drive substrate 510 and the partition plate 108.

[0078] The drive substrate 510 divides the inverter space 94 into a first drive space 94a and a second drive space 94b. The first drive space 94a and the second drive space 94b are contained in the inverter space 94. The first drive space 94a and the second drive space 94b are arranged along the axial direction AD across the drive substrate 510. The first drive space 94a is a space between the drive substrate 510 and the partition plate 108. The second drive space 94b is a space between the drive substrate 510 and the downstream plate 107. The control substrate 550 is disposed in the second drive space 94b.

[0079] The control substrate 550 has a substrate opening 553. The substrate opening 553 penetrates the control substrate 550 in the axial direction AD. The substrate opening 553 is provided at the center of the control substrate 550. The center of the substrate opening 553 is located at a position where the motor axis Cm passes. The inner diameter of the substrate opening 553 is, for example, larger than the outer diameter of the shaft body 341.

[0080] like Figure 1 , Figure 3As shown, in the drive substrate 510, the drive peripheral end 512 extends along the inverter inner wall surface 91a and in the circumferential direction CD. The drive peripheral end 512 is the peripheral end of the drive substrate 510. The drive peripheral end 512 is located at a position in contact with or close to the inverter inner wall surface 91a. In the control substrate 550, the control peripheral end 552 extends along the inverter inner wall surface 91a and in the circumferential direction CD. The control peripheral end 552 is the peripheral end of the control substrate 550. The control peripheral end 552 is located at a position in contact with or close to the inverter inner wall surface 91a.

[0081] The drive substrate 510 has a first drive surface 510a and a second drive surface 510b. The first drive surface 510a is the plate surface on the partition plate 108 side of the pair of plate surfaces of the drive substrate 510, and the second drive surface 510b is the plate surface on the downstream plate 107 side. The second drive surface 510b extends along the control substrate 550.

[0082] The drive substrate 510 is a circuit substrate to which power for driving the motor 61 is supplied. The drive substrate 510 is sometimes referred to as a power substrate. A plurality of filter components 524 and a plurality of smoothing capacitor units 580 are provided on the drive substrate 510. The filter components 524 and the smoothing capacitor units 580 are mounted on the drive substrate 510 in a state of protruding from the first drive surface 510a.

[0083] The smoothing capacitor unit 580 is a component including the smoothing capacitor 145. The smoothing capacitor unit 580 includes an element forming the smoothing capacitor 145 and a protection portion such as a resin for protecting the element.

[0084] like Figure 3 As shown, the plurality of filter components 524 include a common mode coil portion 525, a normal mode coil portion 526, a Y capacitor portion 527, and an X capacitor portion 528. In addition, the common mode coil portion 525 has a common mode coil 151. The common mode coil portion 525 has an element forming the common mode coil 151 and a protective portion such as a resin that protects the element. A plurality of common mode coil portions 525 are provided on the drive substrate 510. The normal mode coil portion 526 has a normal mode coil 152. The normal mode coil portion 526 has an element forming the normal mode coil 152 and a protective portion such as a resin that protects the element. A plurality of normal mode coil portions 526 are provided on the drive substrate 510.

[0085] The Y capacitor unit 527 includes a Y capacitor 153. The Y capacitor unit 527 includes an element forming the Y capacitor 153 and a protective portion such as a resin for protecting the element. A plurality of the Y capacitor units 527 are provided on the drive substrate 510. The X capacitor unit 528 includes an X capacitor 154. The X capacitor unit 528 includes an element forming the X capacitor 154 and a protective portion such as a resin for protecting the element. A plurality of the X capacitor units 528 are provided on the drive substrate 510.

[0086] The current sensors 146 and 147 are provided on the drive substrate 510 together with the smoothing capacitor unit 580 and the like. The current sensors 146 and 147 are mounted on the drive substrate 510 in a state of protruding from the first drive surface 510a. A plurality of motor current sensors 146 are provided for the U phase, the V phase, and the W phase. One battery current sensor 147 is provided for the P line 141.

[0087] like Figure 1 , Figure 3 As shown, the inverter device 80 has an arm switch unit 530. The arm switch unit 530 has an arm switch 86. The arm switch unit 530 has a component such as a MOSFET that forms the arm switch 86 and a protective part such as a resin that protects the component. A plurality of arm switch units 530 are arranged along the inner wall surface 91a of the inverter and in the circumferential direction CD. The arm switch unit 530 is arranged on the first drive surface 510a side relative to the drive substrate 510. For example, the arm switch unit 530 is located away from the drive substrate 510 toward the partition plate 108 side.

[0088] The arm switch unit 530 has a switch body and a switch terminal. The switch body has a component such as a MOSFET and a protection unit. The switch body is formed in a rectangular parallelepiped shape, for example. The switch terminal is a terminal such as a drain terminal extending from the switch body. A plurality of arm switches 530 are provided on the drive substrate 510. The arm switch unit 530 is mounted on the drive substrate 510 in a state of protruding from the first drive surface 510a.

[0089] In the inverter device 80, at least a part of the inverter 81 is accommodated in the inverter space 94. The filter component 524, the arm switch unit 530, and the smoothing capacitor unit 580 are accommodated in the inverter space 94. In addition, the drive substrate 510, the control substrate 550, and the microcomputer 165 are accommodated in the inverter space 94. The inverter space 94 accommodates heat-generating components that generate heat when energized. As heat-generating components, there are the arm switch unit 530, the smoothing capacitor unit 580, the filter component 524, etc.

[0090] like Figure 3 As shown, on the drive substrate 510, the arm switch unit 530, the filter component 524 and the smoothing capacitor unit 580 are arranged in the radial direction RD. For example, in the radial direction RD, a plurality of smoothing capacitor units 580 are provided between a plurality of filter components 524 and a plurality of arm switch units 530. A plurality of smoothing capacitor units 580 are arranged in a direction orthogonal to the arrangement direction of the filter component 524 and the arm switch unit 530. A plurality of arm switch units 530 are arranged in the radial direction RD. A plurality of filter components 524 are also arranged in the radial direction RD.

[0091] like Figure 1As shown, the inverter device 80 has a power connector 96 and a signal connector 97. The power connector 96 and the signal connector 97 are connector parts for connecting the inverter device 80 to an external device. As an external device connected to the power connector 96, there is a battery 31 and the like. For example, the power connector 96 is connected to the battery 31 via a power cable and the like in a manner that can be energized. As an external device connected to the signal connector 97, there is a flight control device 40 and the like. For example, the signal connector 97 is connected to the flight control device 40 via a signal cable and the like in a manner that can communicate.

[0092] The power connector 96 and the signal connector 97 are provided on the outer surface of the inverter housing 90. For example, the power connector 96 is provided on the inverter outer peripheral wall surface 90c, and the signal connector 97 is provided on the inverter downstream wall surface 90b.

[0093] In the EPU 50, the output of the motor 61 is the output of the EPU 50. In the motor device 60, the current, voltage, workload, energy, torque, motor speed, etc. become the output of the motor 61. In the motor 61, if the motor temperature becomes too high, the output may decrease. The motor temperature is the temperature of the motor device 60 or the motor 61, and is the temperature of the motor coil 211, the coil protection part 250, the motor space 74, etc. In the inverter device 80, the current, voltage, etc. become the output of the inverter 81. In the inverter 81, if the inverter temperature becomes too high, the output may decrease. The inverter temperature is the temperature of the inverter device 80 or the inverter 81, and is the temperature of the arm switch part 530 or the inverter space 94, etc.

[0094] In the EPU 50, the output of the motor device 60 and the inverter device 80 is difficult to decrease by cooling the motor device 60 and the inverter device 80. That is, the output density [kw / kg] of the EPU 50 is difficult to decrease. The output density is the output per unit mass in the EPU 50. In the EPU 50, the output density is easily increased by cooling the motor device 60 and the inverter device 80.

[0095] exist Figure 1 , Figure 2In the EPU 50, as a cooling system for cooling the EPU 50, an air cooling system and a liquid cooling system are used. In the EPU 50, as an air cooling system, an external cooling system for cooling the EPU 50 from the outside is used. In this external cooling system, the EPU 50 is cooled by the external air wind Fo flowing outside the EPU 50. The external air wind Fo is a gas such as external air existing outside the EPU 50. In the EPU 50, the motor 61 or the inverter 81 is cooled by releasing the heat of the motor 61 or the inverter 81 to the external air wind Fo. The external air wind Fo flows along the unit outer surface 101os. For example, the external air wind Fo extends along the unit outer peripheral wall 101c and in the axial direction AD.

[0096] The EPU 50 has a peripheral wall fin 831. The peripheral wall fin 831 is included in the motor unit 100. The peripheral wall fin 831 is provided on the unit peripheral wall surface 101c. The peripheral wall fin 831 is a heat dissipation fin that releases the heat of the motor unit 100 to the outside. The peripheral wall fin 831 cools the motor unit 100 by dissipating heat. The peripheral wall fin 831 is formed of a metal material or the like and has thermal conductivity. The peripheral wall fin 831 protrudes radially outward from the unit peripheral wall 105. The peripheral wall fin 831 is formed in a plate shape and extends in a direction orthogonal to the circumferential direction CD. The peripheral wall fin 831 extends along the axial direction AD. A plurality of the peripheral wall fins 831 are arranged in the circumferential direction CD.

[0097] The EPU 50 has a motor fin 72 and an inverter fin 92. The motor fin 72 and the inverter fin 92 are included in the peripheral wall fin 831. In the peripheral wall fin 831, the portion provided on the motor peripheral wall surface 70c is the motor fin 72. The motor fin 72 is included in the motor housing 70. In the peripheral wall fin 831, the portion provided on the inverter peripheral wall surface 90c is the inverter fin 92. The inverter blade 92 is included in the inverter housing 90. In addition, in the peripheral wall fin 831, the motor fin 72 and the inverter fin 92 may be provided integrally or separately from each other.

[0098] In the EPU 50, the cooling effect of the external air wind Fo on the motor unit 100 is improved by the peripheral wall fins 831. Since the peripheral wall fins 831 extend in the axial direction AD, the external air wind Fo easily flows along the peripheral wall fins 831. Therefore, the heat of the motor unit 100 is easily released from the peripheral wall fins 831 to the external air wind Fo. For example, the heat of the motor device 60 is easily released from the motor fins 72 to the external air wind Fo, and the heat of the inverter device 80 is easily released from the inverter fins 92 to the external air wind Fo.

[0099] The EPU 50 has an air supply fan 121. The air supply fan 121 is arranged side by side with the motor unit 100 in the axial direction AD. The propeller 20 is provided between the air supply fan 121 and the motor unit 100 in the axial direction AD. The air supply fan 121 is located on the upwind side of the propeller wind relative to the motor unit 100. The air supply fan 121 supplies air in such a manner that the external air wind Fo flows along the peripheral wall fins 831. For example, the air supply fan 121 supplies air to the downwind side of the propeller wind to cause the external air wind Fo to flow. The air supply fan 121 pressurizes the external air wind Fo toward the motor unit 100. The air supply fan 121 is sometimes referred to as a pressure supply fan.

[0100] The air supply fan 121 supplies air as the motor 61 is driven. The air supply fan 121 is provided on the EPU shaft 51. The air supply fan 121 is connected to the motor shaft 340 via the EPU shaft 51. The air supply fan 121 rotates with the motor shaft 340 around the motor axis Cm. The air supply fan 121 is an axial flow fan and supplies air in the axial direction AD. The air supply fan 121 is a mechanical fan that is rotated by the motor shaft 340.

[0101] The air supply fan 121 has an air supply blade 122 and an air supply head 123. A plurality of air supply blades 122 are arranged in the circumferential direction CD. The air supply head 123 connects the plurality of air supply blades 122. The air supply blades 122 extend radially outward from the air supply head 123. The air supply head 123 is fixed to the EPU shaft 51. The air supply head 123 extends along the outer peripheral surface of the EPU shaft 51 and in the circumferential direction CD. At least a portion of the air supply blade 122 is located in a position parallel to the outer peripheral wall fin 831 along the axial direction AD.

[0102] The EPU 50 includes a cooling device 800. The cooling device 800 is included in a liquid cooling system. The cooling device 800 uses a refrigerant RF to cool the EPU 50. As the refrigerant RF, for example, a liquid such as a coolant is used. The refrigerant RF is sometimes referred to as a liquid refrigerant. In the EPU 50, a cooling method using the refrigerant RF is used as a cooling method. In the cooling device 800, the motor 61 or the inverter 81 is cooled by releasing the heat of the motor 61 or the inverter 81 to the refrigerant RF. The heat of the refrigerant RF is released to the external air Fo via the peripheral wall fins 831, for example.

[0103] The cooling device 800 includes a refrigerant pump 801 and a refrigerant passage 810. The refrigerant passage 810 is a passage through which the refrigerant RF flows. The refrigerant passage 810 is a circulation passage through which the refrigerant RF circulates in the cooling device 800. The refrigerant passage 810 is filled with the refrigerant RF. The refrigerant passage 810 is included in the EPU 50, and the refrigerant RF circulates in the EPU 50. The refrigerant passage 810 is provided so that the refrigerant RF cools both the motor device 60 and the inverter device 80. The EPU 50 includes a passage forming portion that forms the refrigerant passage 810. The passage forming portion is included in the unit casing 101 or the like. The passage forming portion is included in the liquid cooling system together with the cooling device 800.

[0104] The refrigerant pump 801 pressurizes the refrigerant RF in the refrigerant passage 810 so that the refrigerant RF flows through the refrigerant passage 810. The refrigerant pump 801 is a circulation pump that circulates the refrigerant RF in the refrigerant passage 810. The refrigerant pump 801 is, for example, an electric pump. The refrigerant pump 801 is driven by power from the battery 31. The refrigerant pump 801 is included in the inverter device 80. The refrigerant pump 801 is, for example, provided on the drive substrate 510.

[0105] like Figure 1 , Figure 2 , Figure 4 As shown, the refrigerant passage 810 has a motor peripheral path 811. The motor peripheral path 811 is provided in a manner to cover the motor 61 from the outer peripheral side. The motor peripheral path 811 is a water cooling jacket of the motor 61. The motor peripheral path 811 is formed in a ring shape in a manner extending in the circumferential direction CD. The motor peripheral path 811 is provided in the motor housing 70. On the other hand, the motor peripheral path 811 is not provided in the inverter housing 90.

[0106] The motor peripheral path 811 is provided at a position covering the motor coil 211 from the outer peripheral side. The motor peripheral path 811 extends along the outer peripheral surface of the motor coil 211. The motor peripheral path 811 can cool at least the motor coil 211 of the motor 61. The motor peripheral path 811 cools the motor coil 211 from the outer peripheral side. The motor peripheral path 811 is equivalent to a coil cooling path.

[0107] The motor peripheral path 811 extends along the unit outer surface 101os so that the refrigerant RF flows along the unit outer surface 101os. The motor peripheral path 811 is equivalent to the outer surface passage. The motor peripheral path 811 is built into the unit housing 101. The motor peripheral path 811 is provided inside the unit outer surface 101os in the unit housing 101. The motor peripheral path 811 is equivalent to the built-in passage. The motor peripheral path 811 is provided between the unit outer surface 101os and the unit inner surface 101is in the unit housing 101.

[0108] The motor unit 100 has a unit liquid cooling portion 821 and liquid cooling fins 835. The unit liquid cooling portion 821 is a portion in the unit housing 101 that performs liquid cooling using a refrigerant RF. The unit liquid cooling portion 821 is a passage forming portion that forms the motor peripheral path 811 in the unit housing 101. The unit liquid cooling portion 821 forms a unit outer surface 101os and a unit inner surface 101is. The motor peripheral path 811 is built into the unit liquid cooling portion 821. The unit liquid cooling portion 821 is equivalent to a passage built-in portion.

[0109] The liquid cooling fin 835 is a heat dissipation fin that releases the heat of the unit liquid cooling part 821 to the outside. The liquid cooling fin 835 is arranged on the outside of the unit liquid cooling part 821. The liquid cooling fin 835 is arranged on the unit outer surface 101os in the unit liquid cooling part 821. A plurality of liquid cooling fins 835 are arranged along the unit outer surface 101os. The liquid cooling fin 835 extends from the unit liquid cooling part 821 toward the outside. The liquid cooling fin 835 releases the heat of the refrigerant RF flowing inside the unit liquid cooling part 821 to the outside. The liquid cooling fin 835 is equivalent to the refrigerant fin and the outer fin.

[0110] In the present embodiment, the motor peripheral path 811 is included in the motor device 60. The motor peripheral path 811 extends along the motor housing outer surface 70os so that the refrigerant RF flows along the motor housing outer surface 70os. The motor peripheral path 811 is built into the motor housing 70. The motor peripheral path 811 is provided between the motor housing outer surface 70os and the motor housing inner surface 70is in the motor housing 70. The unit liquid cooling part 821 is included in the motor housing 70.

[0111] The motor peripheral path 811 extends along the motor peripheral wall surface 70c so that the refrigerant RF flows along the motor peripheral wall surface 70c. The motor peripheral path 811 is built into the motor peripheral wall 71. The motor peripheral path 811 extends in the axial direction AD in a manner of being bridged between the motor upstream wall 78 and the motor downstream wall 79. The motor peripheral path 811 is provided between the motor peripheral wall surface 70c and the motor inner wall surface 71a in the motor peripheral wall 71. The unit liquid cooling portion 821 has at least a portion of the motor peripheral wall 71. For example, the motor peripheral wall 71 is the unit liquid cooling portion 821.

[0112] The liquid cooling fin 835 is at least a part of the outer peripheral wall fin 831. In the present embodiment, the liquid cooling fin 835 is at least a part of the motor fin 72. For example, the motor fin 72 is the liquid cooling fin 835. The motor fin 72, as the liquid cooling fin 835, releases the heat of the refrigerant RF flowing inside the motor outer peripheral wall 71 to the outside.

[0113] like Figure 1 , Figure 2 As shown, the motor peripheral path 811 is arranged in a position parallel to both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. The motor peripheral path 811 is equivalent to a common path. In the radial direction RD in the direction orthogonal to the circumferential direction CD, the motor peripheral path 811 and the motor device 60 are arranged. In the present embodiment, since the motor peripheral path 811 is located radially outside the motor housing 70, the motor peripheral path 811 and the motor device 60 are arranged in the radial direction RD. The motor peripheral path 811 is arranged on the outer peripheral side of the motor device 60. The motor peripheral path 811 is parallel to the motor housing inner surface 70is in the radial direction RD. The refrigerant RF flowing in the motor peripheral path 811 cools the motor device 60 from the radial outside. For example, the refrigerant RF flowing in the motor peripheral path 81 cools the motor coil 211 from the outer peripheral side.

[0114] In the axial direction AD in the direction orthogonal to the circumferential direction CD, the motor outer peripheral road 811 and the inverter device 80 are arranged side by side. The motor outer peripheral road 811 is arranged between the inner surface 90is of the inverter housing and the upstream wall surface 70a of the motor in the axial direction AD. Since the motor outer peripheral wall 71 has a unit liquid cooling portion 821, the motor inner wall surface 71a is arranged at a position radially inner than the inverter inner wall surface 91a in the radial direction RD. At least a part of the motor outer peripheral road 811 is located at a position radially inner than the inverter inner wall surface 91a. The refrigerant RF flowing in the motor outer peripheral road 811 cools the inverter device 80 from the inverter upstream wall surface 90a side.

[0115] The motor unit 100 has a unit air cooling portion 822 and air cooling fins 836. The unit air cooling portion 822 is a portion in the unit housing 101 where air cooling is performed. The unit air cooling portion 822 is arranged along the unit outer surface 101os and in parallel with the unit liquid cooling portion 821. For example, the unit air cooling portion 822 and the unit liquid cooling portion 821 are arranged along the unit outer surface 101os and in the axial direction AD. The unit air cooling portion 822 is arranged on the leeward side of the external air wind Fo relative to the unit liquid cooling portion 821. The unit air cooling portion 822 does not form a refrigerant passage 810.

[0116] The air-cooling fin 836 is a heat dissipation fin that releases the heat of the unit air-cooling part 822 to the outside. The air-cooling fin 836 is arranged on the outside of the unit air-cooling part 822. The air-cooling fin 836 is arranged on the unit outer surface 101os in the unit air-cooling part 822. A plurality of air-cooling fins 836 are arranged along the unit outer surface 101os. The air-cooling fin 836 extends outward from the unit air-cooling part 822. The air-cooling fin 836 is arranged side by side with the liquid-cooling fin 835 along the unit outer surface 101os. For example, the air-cooling fin 836 and the liquid-cooling fin 835 are arranged along the unit outer surface 101os and in the axial direction AD. The air-cooling fin 836 is arranged on the leeward side of the external air wind Fo relative to the liquid-cooling fin 835. The air-cooling fin 836 releases the heat of the unit casing 101 to the outside. The air-cooling fin 836 is equivalent to the casing fin. In addition, the liquid cooling fins 835 and the air cooling fins 836 may be provided integrally or separately from each other.

[0117] The unit air-cooling portion 822 is included in the inverter housing 90. The unit air-cooling portion 822 is at least a portion of the inverter peripheral wall 91. For example, the inverter peripheral wall 91 is the unit air-cooling portion 822. The unit air-cooling portion 822 is arranged side by side with the unit liquid-cooling portion 821 in the axial direction AD. The air-cooling fin 836 is at least a portion of the peripheral wall fin 831. In the present embodiment, the air-cooling fin 836 is at least a portion of the inverter fin 92. For example, the inverter fin 92 is the air-cooling fin 836. The inverter fin 92 releases the heat of the inverter peripheral wall 91 to the outside as the air-cooling fin 836.

[0118] like Figure 1 , Figure 2 As shown, the heat transferred to the unit air cooling part 822 in the inverter device 80 is released to the outside as heat Ha from the air cooling fins 836. For example, the heat generated by the arm switch part 530 and the like is transferred from the inverter space 94 to the inverter outer peripheral wall 91 as heat Ha, and then released to the outside from the inverter fins 92.

[0119] The heat transferred to the unit liquid cooling part 821 in the motor unit 100 is applied to the refrigerant RF as heat Hb. For example, the heat generated by the motor coil 211 and the like is transferred from the motor space 74 to the refrigerant RF as heat Hb. In addition, the heat generated by the arm switch part 530 and the like is transferred from the inverter space 94 to the refrigerant RF as heat Hb. The heat Hb transferred to the refrigerant RF is released from the liquid cooling fin 835 to the outside in the unit liquid cooling part 821 as heat Hc. For example, the heat Hc is transferred from the refrigerant RF to the motor fin 72 in the motor peripheral wall 71, and is released from the motor fin 72 to the outside.

[0120] In the motor unit 100, heat is also released to the outside from locations other than the unit liquid cooling portion 821 and the unit air cooling portion 822. For example, heat from the motor device 60 and the inverter device 80 is also released to the outside from the upstream plate 106 and the downstream plate 107.

[0121] When the refrigerant pump 801 is driven, the refrigerant RF circulates in the refrigerant passage 810 by passing through the motor peripheral path 811. In the motor peripheral path 811, the refrigerant RF flows in a circulating manner along the circumferential direction CD. The refrigerant RF absorbs the heat of the motor device 60 or the inverter device 80 in the motor peripheral path 811, and releases the heat to the outside from the liquid cooling fins 835. In addition, the heat of the refrigerant RF is released to the outside from the unit outer surface 101os or the air cooling fins 836 in addition to the liquid cooling fins 835.

[0122] When the air supply fan 121 supplies air, the external air wind Fo flows along the outer peripheral wall fin 831. For example, the external air wind Fo flows along the liquid cooling fin 835 and then flows along the air cooling fin 836. That is, the external air wind Fo flows along the inverter fin 92 after flowing along the motor fin 72. In this case, the release of heat Hc from the inverter fin 92 to the external air wind Fo is promoted by the external air wind Fo. In addition, the release of heat Ha from the motor fin 72 to the external air wind Fo is promoted by the external air wind Fo.

[0123] According to the present embodiment described so far, both the motor device 60 and the inverter device 80 are cooled by the refrigerant RF circulating in the refrigerant passage 810. In this structure, the temperature rise of the motor device 60 and the temperature rise of the inverter device 80 can be suppressed by the refrigerant RF. Therefore, in each of the motor device 60 and the inverter device 80, it is difficult to cause a decrease in output such as current due to a temperature rise. Therefore, the output density of the EPU 50 can be improved.

[0124] Furthermore, since the refrigerant RF circulates in the refrigerant passage 810, it is not necessary to supply the refrigerant RF to the EPU 50 from the outside. Therefore, it is not necessary to install a supply device for supplying the refrigerant RF to the EPU 50 in the eVTOL 10. Therefore, the weight of the eVTOL 10 can be reduced by the amount of the unnecessary supply device. In addition, it is not necessary to connect the supply piping for supplying the refrigerant RF from the supply device to the EPU 50 to the EPU 50. Therefore, the weight of the EPU 50 can be reduced by the amount of the unnecessary supply piping.

[0125] For example, unlike the present embodiment, a comparative example is assumed in which only one of the motor device 60 and the inverter device 80 is cooled by the liquid cooling system. In this comparative example, the cooling performance required of the liquid cooling system is limited to the cooling performance that can cool one of the motor device 60 and the inverter device 80. In this way, since the cooling performance required of the liquid cooling system in the comparative example is not high, it is easy to cause a decrease in output accompanying a temperature increase of the EPU 50.

[0126] In contrast, in the present embodiment, both the motor device 60 and the inverter device 80 are cooled by the liquid cooling system. Therefore, in the present embodiment, the cooling performance required by the liquid cooling system is easily increased compared to the comparative example. In addition, in the present embodiment, both the motor device 60 and the inverter device 80 can be effectively cooled by the refrigerant RF of the liquid cooling system. Therefore, even if it is assumed that the cooling performance required by the liquid cooling system increases, since the cooling effect of the motor device 60 and the inverter device 80 is high, it is difficult to produce a decrease in output accompanying the temperature increase of the EPU 50. Therefore, by improving the cooling effect of the EPU 50, the output density of the EPU 50 can be improved.

[0127] According to the present embodiment, the motor peripheral path 811 is arranged side by side with both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. In this structure, both the motor device 60 and the inverter device 80 can be cooled by the motor peripheral path 811 which is at least a part of the refrigerant passage 810. Therefore, it is not necessary to separately provide the motor peripheral path 811 in each of the motor device 60 and the inverter device 80. Therefore, the total length of the motor peripheral path 811 can be shortened. When the motor peripheral path 811 is shortened, the weight reduction of the EPU 50 can be achieved by miniaturizing the unit liquid cooling part 821 forming the motor peripheral path 811, reducing the amount of refrigerant RF flowing through the motor peripheral path 811, etc. In this way, by shortening the motor peripheral path 811, the output density of the EPU 50 can be improved.

[0128] Moreover, the motor peripheral path 811 extends in the circumferential direction CD. Therefore, in the motor peripheral path 811, the refrigerant RF easily flows in the circumferential direction CD. Therefore, the refrigerant RF flowing in the motor peripheral path 811 can cool both the motor device 60 and the inverter device 80 in a concentrated manner. As a result, it is difficult for the cooling effect of the refrigerant RF on one of the motor device 60 and the inverter device 80 to be lower than the cooling effect of the refrigerant RF on the other. Therefore, it is possible to suppress the insufficient cooling effect on one of the motor device 60 and the inverter device 80.

[0129] For example, unlike the present embodiment, a configuration is assumed in which the refrigerant RF flowing through the motor peripheral path 811 cools the inverter device 80 after cooling the motor device 60. In this configuration, the refrigerant RF cools the inverter device 80 after being applied with the heat of the motor device 60. Therefore, the cooling effect of the refrigerant RF on the inverter device 80 may be lower than the cooling effect of the refrigerant RF on the motor device 60.

[0130] According to the present embodiment, the motor peripheral road 811 is arranged in parallel with the inverter device 80 in the axial direction AD and is provided on the outer peripheral side of the motor device 60. In this structure, it is not necessary to provide the motor peripheral road 811 on the outer peripheral side of the inverter device 80. Therefore, compared with a structure in which the motor peripheral road 811 is provided on the outer peripheral side of the inverter device 80, for example, the motor peripheral road 811 can be shortened in the circumferential direction CD. As described above, by achieving a short size of the motor peripheral road 811, the output density of the EPU 50 can be improved by reducing the weight of the EPU 50.

[0131] In the present embodiment, it is considered that the cooling effect of the motor peripheral road 811 on the inverter device 80 is lower than the cooling effect of the motor peripheral road 811 on the motor device 60 by arranging the motor peripheral road 811 in the axial direction AD. On the other hand, as described above, by shortening the motor peripheral road 811, the weight of the EPU 50 can be reduced. As described above, since the weight of the EPU 50 is reduced without significantly reducing the cooling effect of the motor peripheral road 811 on the inverter device 80, the output density of the EPU 50 can be improved.

[0132] According to the present embodiment, the motor peripheral circuit 811 cools the motor coil 211. In this structure, the motor coil 211, which is most likely to generate heat in the motor device 60, is cooled by the motor peripheral circuit 811, so the cooling effect of the motor peripheral circuit 811 on the motor device 60 can be effectively utilized. For example, in the motor device 60 in which the motor coil 211 is the component that generates the most heat among the components constituting the motor 61, it is most effective to cool the motor coil 211 by the motor peripheral circuit 811 in addition to cooling the motor device 60.

[0133] According to the present embodiment, the liquid cooling fin 835 is provided on the unit outer surface 101os in a manner to release the heat of the refrigerant RF. In this structure, even if the heat of the motor device 60 or the inverter device 80 is applied to the refrigerant RF, the heat is easily released to the outside through the liquid cooling fin 835. That is, the heat dissipation from the refrigerant RF is promoted by the liquid cooling fin 835. Therefore, the heat accumulation in the refrigerant RF can be suppressed by the liquid cooling fin 835. Therefore, it is possible to avoid the accumulation of heat in the refrigerant RF and reduce the cooling effect of the refrigerant RF.

[0134] In the present embodiment, since the EPU 50 has the liquid cooling fins 835, the weight of the EPU 50 increases by the amount of the liquid cooling fins 835. On the other hand, as described above, the heat dissipation from the refrigerant RF is promoted by the liquid cooling fins 835. Therefore, while the cooling effect of the refrigerant RF is maintained by the liquid cooling fins 835, the weight of the EPU 50 can be reduced by miniaturizing the motor peripheral path 811, reducing the amount of the refrigerant RF, miniaturizing the refrigerant pump 801, etc. Therefore, the output density of the EPU 50 can be increased by the liquid cooling fins 835.

[0135] According to the present embodiment, the air supply fan 121 supplies air in such a manner that the external air wind Fo flows along the liquid cooling fins 835. In this structure, the heat of the refrigerant RF is easily released to the external air wind Fo via the liquid cooling fins 835. That is, the heat dissipation from the refrigerant RF is promoted by the air supply of the air supply fan 121. Therefore, the air supply of the air supply fan 121 can reliably suppress the accumulation of heat in the refrigerant RF and reduce the cooling effect of the refrigerant RF.

[0136] In the present embodiment, since the EPU 50 has the air supply fan 121, the weight of the EPU 50 increases by the amount of the air supply fan 121. On the other hand, as described above, the heat dissipation from the refrigerant RF is promoted by the air supply of the air supply fan 121. Therefore, while the cooling effect of the refrigerant RF is maintained by the air supply fan 121, the weight of the EPU 50 can be reduced by miniaturizing the motor peripheral path 811, reducing the amount of the refrigerant RF, miniaturizing the refrigerant pump 801, etc. Therefore, the output density of the EPU 50 can be increased by the air supply fan 121.

[0137] According to the present embodiment, the EPU 50 is used to drive the eVTOL 10 to fly. In this structure, when the eVTOL 10 is flying by the drive of the EPU 50, the output density of the EPU 50 can be increased by the refrigerant RF circulating in the refrigerant passage 810. In aircraft such as the eVTOL 10, the requirements for suppressing possible malfunctions are strict, and the requirements for the output density of the EPU 50 are also strict. In contrast, in the present embodiment, on the basis of achieving the strict requirements for the output density of the EPU 50, the effect of the refrigerant RF on increasing the output density of the EPU 50 can be effectively exerted.

[0138] According to the present embodiment, the interior of the unit housing 101 is cooled, for example, by the refrigerant RF circulating in the refrigerant passage 810. In this structure, inside the unit housing 101, the temperature rise of the motor 61 or the inverter 81 can be suppressed by the refrigerant RF. Therefore, it is difficult to produce a situation where the output of the motor 61 or the inverter 81, such as the current, is reduced. Moreover, the heat of the refrigerant RF is released to the outside by the liquid-cooling fins 835 provided on the unit outer surface 101os. In this structure, the cooling effect of the refrigerant RF on cooling the motor 61 or the inverter 81 can be improved by the liquid-cooling fins 835. Therefore, the output density of the EPU 50 can be improved by the liquid-cooling fins 835.

[0139] Furthermore, as described above, since the refrigerant RF circulates in the refrigerant passage 810, it is not necessary to supply the refrigerant RF from the outside to the EPU 50. Thus, the eVTOL 10 can be made lighter by the amount of unnecessary supply devices, and the EPU 50 can be made lighter by the amount of unnecessary supply piping.

[0140] In this embodiment, the weight of the EPU 50 is increased by the amount of the liquid cooling fins 835. On the other hand, in the EPU 50, the heat accumulation in the refrigerant RF and the reduction in the cooling effect of the refrigerant RF can be suppressed by the liquid cooling fins 835. In this way, the EPU 50 is effectively cooled by the refrigerant RF and the liquid cooling fins 835, and therefore, the output density of the EPU 50 can be increased by the liquid cooling fins 835.

[0141] According to the present embodiment, a plurality of liquid cooling fins 835 are arranged along the motor peripheral path 811 to release the heat of the refrigerant RF flowing in the motor peripheral path 811. In this structure, the heat of the refrigerant RF is easily transferred to the liquid cooling fins 835 regardless of where the refrigerant RF flows in the motor peripheral path 811. That is, in the motor peripheral path 811, the heat of the refrigerant RF is easily released to the outside from the liquid cooling fins 835 regardless of the position of the refrigerant RF. Therefore, the heat accumulation in the refrigerant RF can be reliably suppressed by the liquid cooling fins 835.

[0142] According to the present embodiment, the unit liquid cooling part 821 having the motor peripheral path 811 built therein is included in the unit housing 101. In this structure, the unit housing 101 can be directly cooled by the refrigerant RF flowing in the motor peripheral path 811. Therefore, the heat of the motor device 60 or the inverter device 80 can be suppressed from accumulating in the unit housing 101 by the unit liquid cooling part 821. Moreover, the liquid cooling fins 835 are provided on the outside of the unit liquid cooling part 821. In this structure, the heat applied to the unit liquid cooling part 821 from the refrigerant RF is easily released to the outside from the liquid cooling fins 835. Therefore, the cooling effect of the refrigerant RF on the unit housing 101 can be further improved by the liquid cooling fins 835.

[0143] According to the present embodiment, the air-cooling fins 836 are arranged along the unit outer surface 101os and in parallel with the liquid-cooling fins 835, and release the heat of the unit housing 101. In this structure, in the unit housing 101, the air-cooling fins 836 can be used to suppress the accumulation of heat in the unit air-cooling part 822 and other parts where the cooling effect of the refrigerant RF is difficult to be applied. Therefore, the air-cooling fins 836 can suppress the reduction of the cooling effect of the parts other than the unit liquid-cooling part 821 in the unit housing 101.

[0144] In addition, in this structure, it is possible to realize both that the heat of the motor device 60 or the inverter device 80 is released to the outside through the liquid cooling fin 835 via the refrigerant RF and that the heat is released to the outside through the air cooling fin 836 without passing through the refrigerant RF. Therefore, in the EPU 50, the liquid cooling fin 835 and the air cooling fin 836 can be used separately according to the object to be cooled. Thus, the output density of the EPU 50 can be optimized in detail.

[0145] According to the present embodiment, the liquid-cooling fins 835 and the air-cooling fins 836 are arranged along the unit outer surface 101os and in the axial direction AD. In this structure, for example, when the gas flows along the unit outer surface 101os and in the axial direction AD as the external air wind Fo, the external air wind Fo easily flows along both the liquid-cooling fins 835 and the air-cooling fins 836. In this case, the external air wind Fo can promote heat dissipation from each of the liquid-cooling fins 835 and the air-cooling fins 836. Therefore, by improving the heat dissipation effect of the liquid-cooling fins 835 and the air-cooling fins 836, the liquid-cooling fins 835 and the air-cooling fins 836 can be miniaturized and reduced in number while maintaining the cooling effect of the EPU 50. Due to the miniaturization or reduction in number of such liquid-cooling fins 835 or air-cooling fins 836, the output density of the EPU 50 can be improved by achieving the lightweight of the EPU 50.

[0146] In addition, in this structure, the external air wind Fo can be shared by the liquid cooling fin 835 and the air cooling fin 836. Therefore, the liquid cooling fin 835 and the air cooling fin 836 can be concentrated and air-cooled efficiently by the external air wind Fo. Therefore, the loss of the external air wind Fo relative to the liquid cooling fin 835 and the air cooling fin 836 can be reduced. By reducing the loss of the external air wind Fo in this way, the liquid cooling fin 835 and the air cooling fin 836 can be miniaturized or reduced in number.

[0147] <Second embodiment> In the first embodiment, the motor unit 100 has the air-cooling fins 836. In contrast, in the second embodiment, the motor unit 100 does not have the air-cooling fins 836. The structure, function, and effect not particularly described in the second embodiment are the same as those in the first embodiment. In the second embodiment, the description will be centered on the points that are different from the first embodiment.

[0148] like Figure 7 As shown, the motor unit 100 has the motor fins 72 and the liquid cooling fins 835, but does not have the inverter fins 92 and the air cooling fins 836. The peripheral wall fins 831 include the motor fins 72 and the liquid cooling fins 835, but do not include the inverter fins 92 and the air cooling fins 836. The peripheral wall fins 831 are provided on the motor peripheral wall surface 70c, but are not provided on the inverter peripheral wall surface 90c. In this embodiment, the heat transferred to the unit air cooling part 822 in the inverter device 80 is directly released to the outside from the unit air cooling part 822 as heat Hb without passing through the air cooling fins 836.

[0149] <Third embodiment> In the first embodiment, the motor device 60 is provided on the upwind side of the outside air flow Fo with respect to the inverter device 80. In contrast, in the third embodiment, the motor device 60 is provided on the downwind side. The structure, function, and effect not particularly described in the third embodiment are the same as those in the first embodiment. In the third embodiment, the description will be centered on the points different from the first embodiment.

[0150] like Figure 8 As shown, the motor device 60 is located on the downwind side of the external air wind Fo relative to the inverter device 80. In the axial direction AD, the inverter device 80 is provided between the motor device 60 and the propeller 20. The unit liquid cooling portion 821 and the liquid cooling fins 835 are located on the downwind side of the external air wind Fo relative to the unit air cooling portion 822 and the air cooling fins 836. The motor peripheral wall 71 and the motor fins 72 are located on the downwind side of the external air wind Fo relative to the inverter peripheral wall 91 and the inverter fins 92.

[0151] <Fourth embodiment> In the first embodiment, in the refrigerant passage 810, the motor peripheral passage 811 is provided on the peripheral side of the motor device 60. In contrast, in the fourth embodiment, the refrigerant passage 810 is provided on the peripheral side of the inverter device 80. The structure, function, and effect not particularly described in the fourth embodiment are the same as those in the first embodiment. In the fourth embodiment, the description will be centered on the points different from the first embodiment.

[0152] like Fig. 9 As shown, the refrigerant passage 810 has an inverter peripheral path 812. The inverter peripheral path 812 is provided in a manner to cover the inverter 81 from the peripheral side. For example, the inverter peripheral path 812 is provided at a position to cover the arm switch portion 530 from the peripheral side. The inverter peripheral path 812 is a water cooling jacket of the inverter 81. The inverter peripheral path 812 is formed into a ring shape in a manner extending in the circumferential direction CD. The inverter peripheral path 812 is provided in the inverter housing 90. On the other hand, the inverter peripheral path 812 is not provided in the motor housing 70.

[0153] The inverter peripheral road 812 extends along the unit outer surface 101os so that the refrigerant RF flows along the unit outer surface 101os. The inverter peripheral road 812 is equivalent to the outer surface passage. The inverter peripheral road 812 is built into the unit housing 101. The inverter peripheral road 812 is set on the inner side of the unit outer surface 101os in the unit housing 101. The inverter peripheral road 812 is equivalent to the built-in passage. The inverter peripheral road 812 is set between the unit outer surface 101os and the unit inner surface 101is in the unit housing 101.

[0154] In the present embodiment, the inverter peripheral path 812 is included in the inverter device 80. The inverter peripheral path 812 extends along the inverter housing outer surface 90os so that the refrigerant RF flows along the inverter housing outer surface 90os. The inverter peripheral path 812 is built into the inverter housing 90. The inverter peripheral path 812 is provided in the inverter housing 90 between the inverter housing outer surface 90os and the inverter housing inner surface 90is.

[0155] The inverter peripheral road 812 extends along the inverter peripheral wall surface 90c so that the refrigerant RF flows along the inverter peripheral wall surface 90c. The inverter peripheral road 812 is built into the inverter peripheral wall 91. The inverter peripheral road 812 extends along the axial direction AD in a manner of being bridged on the inverter upstream wall 98 and the inverter downstream wall 99. The inverter peripheral road 812 is set between the inverter peripheral wall surface 90c and the inverter inner wall surface 91a in the inverter peripheral wall 91.

[0156] In this embodiment, the unit liquid cooling part 821 forms the inverter outer peripheral path 812. The unit liquid cooling part 821 is included in the inverter housing 90. The unit liquid cooling part 821 has at least a part of the inverter outer peripheral wall 91. For example, the inverter outer peripheral wall 91 is the unit liquid cooling part 821.

[0157] In the present embodiment, the liquid cooling fin 835 is at least a part of the inverter fin 92. For example, the inverter fin 92 is the liquid cooling fin 835. The inverter fin 92 as the liquid cooling fin 835 releases the heat of the refrigerant RF flowing inside the inverter outer peripheral wall 91 to the outside.

[0158] The inverter peripheral road 812 is arranged at a position parallel to both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. The inverter peripheral road 812 is equivalent to a common passage. In the radial direction RD in the direction orthogonal to the circumferential direction CD, the inverter peripheral road 812 and the inverter device 80 are arranged side by side. In the present embodiment, since the inverter peripheral road 812 is located radially outside the inverter housing 90, the inverter peripheral road 812 and the inverter device 80 are arranged along the radial direction RD. The inverter peripheral road 812 is arranged on the outer peripheral side of the inverter device 80. The inverter peripheral road 812 is parallel to the inner surface 90is of the inverter housing along the radial direction RD. The refrigerant RF flowing in the inverter peripheral road 812 cools the inverter device 80 from the radial outside. For example, the refrigerant RF flowing in the inverter peripheral road 812 cools the arm switch part 530 from the outer peripheral side.

[0159] In the axial direction AD in the direction orthogonal to the circumferential direction CD, the inverter outer peripheral road 812 and the motor device 60 are arranged side by side. The inverter outer peripheral road 812 is arranged between the motor housing inner surface 70is and the inverter downstream wall surface 90b in the axial direction AD. Since the inverter outer peripheral wall 91 has a unit liquid cooling portion 821, the inverter inner wall surface 91a is arranged at a position radially inner than the motor inner wall surface 71a in the radial direction RD. At least a part of the inverter outer peripheral road 812 is located at a position radially inner than the motor inner wall surface 71a. The refrigerant RF flowing in the inverter outer peripheral road 812 cools the motor device 60 from the motor downstream wall surface 70b side.

[0160] The unit air-cooling portion 822 is included in the motor housing 70. The unit air-cooling portion 822 is at least a portion of the motor peripheral wall 71. For example, the motor peripheral wall 71 is the unit air-cooling portion 822. In the present embodiment, the air-cooling fin 836 is at least a portion of the motor fin 72. For example, the motor fin 72 is the air-cooling fin 836. The motor fin 72 serves as the air-cooling fin 836 to release the heat of the motor peripheral wall 71 to the outside.

[0161] like Fig. 9 As shown, the heat transferred to the unit air cooling portion 822 in the motor device 60 is released as heat Ha from the air cooling fins 836 to the outside. For example, the heat generated by the motor 61 and the like is transferred as heat Ha from the motor space 74 to the motor outer peripheral wall 71, and then released from the motor fins 72 to the outside.

[0162] For example, the heat generated by the arm switch unit 530 and the like is transferred from the inverter space 94 to the refrigerant RF as heat Hb. In addition, the heat generated by the motor coil 211 and the like is transferred from the motor space 74 to the refrigerant RF as heat Hb. The heat Hb transferred to the refrigerant RF is transferred from the refrigerant RF to the inverter fins 92 in the inverter peripheral wall 91 as heat Hc, and is released from the inverter fins 92 to the outside.

[0163] In the present embodiment, when the refrigerant pump 801 is driven, the refrigerant RF circulates in the refrigerant passage 810 so as to pass through the inverter outer peripheral path 812. In the inverter outer peripheral path 812, the refrigerant RF flows so as to circulate in the circumferential direction CD.

[0164] According to the present embodiment, the inverter peripheral road 812 is arranged in parallel with the motor device 60 in the axial direction AD and is provided on the outer peripheral side of the inverter device 80. In this structure, it is not necessary to provide the inverter peripheral road 812 on the outer peripheral side of the motor device 60. Therefore, compared with a structure in which the inverter peripheral road 812 is provided on the outer peripheral side of the motor device 60, the inverter peripheral road 812 can be shortened in the circumferential direction CD. As described above, by achieving a short size of the inverter peripheral road 812, the output density of the EPU 50 can be improved by reducing the weight of the EPU 50.

[0165] In the present embodiment, by arranging the inverter peripheral road 812 in parallel with a part of the motor device 60 in the axial direction AD, the cooling effect of the inverter peripheral road 812 on the motor device 60 may be lower than the cooling effect of the inverter peripheral road 812 on the inverter device 80. On the other hand, as described above, by shortening the inverter peripheral road 812, the weight of the EPU 50 can be reduced. As described above, since the weight of the EPU 50 is reduced without significantly reducing the cooling effect of the inverter peripheral road 812 on the motor device 60, the output density of the EPU 50 can be improved.

[0166] <Fifth embodiment> In the fourth embodiment, the inverter device 80 is provided on the leeward side of the outside air wind Fo with respect to the motor device 60. In contrast, in the fifth embodiment, the inverter device 80 is provided on the upwind side of the outside air wind Fo with respect to the motor device 60. The structure, function, and effect not particularly described in the fifth embodiment are the same as those in the fourth embodiment. In the fifth embodiment, the description will be centered on the points different from the fourth embodiment.

[0167] like Fig.10 As shown, the inverter device 80 is located on the upwind side of the external air wind Fo relative to the motor device 60. In the axial direction AD, the inverter device 80 is provided between the motor device 60 and the propeller 20, similarly to the third embodiment described above. The unit liquid cooling portion 821 and the liquid cooling fins 835 are located on the upwind side of the external air wind Fo relative to the unit air cooling portion 822 and the air cooling fins 836. The inverter outer peripheral wall 91 and the inverter fins 92 are located on the upwind side of the external air wind Fo relative to the motor outer peripheral wall 71 and the motor fins 72.

[0168] <Sixth embodiment> In the fifth embodiment, the motor unit 100 has the air-cooling fins 836. In contrast, in the sixth embodiment, the motor unit 100 does not have the air-cooling fins 836. The structure, function, and effect not particularly described in the sixth embodiment are the same as those in the fifth embodiment. In the sixth embodiment, the description will be centered on the points different from the fifth embodiment.

[0169] In this embodiment, similarly to the above-mentioned second embodiment, the motor unit 100 has the motor fins 72 and the liquid cooling fins 835, but does not have the inverter fins 92 and the air cooling fins 836. Fig.11 As shown, the peripheral wall fins 831 include the inverter fins 92 and the liquid cooling fins 835, but do not include the motor fins 72 and the air cooling fins 836. The peripheral wall fins 831 are provided on the inverter peripheral wall surface 90c, but are not provided on the motor peripheral wall surface 70c. In this embodiment, the heat transferred to the unit air cooling part 822 in the motor device 60 is directly released to the outside from the unit air cooling part 822 as heat Hb without passing through the air cooling fins 836.

[0170] <Seventh embodiment> In the first embodiment, the motor peripheral path 811 is provided on the outer peripheral side of the motor device 60, and in the fourth embodiment, the inverter peripheral path 812 is provided on the outer peripheral side of the inverter device 80. In contrast, in the seventh embodiment, the refrigerant passage 810 is provided on the outer peripheral side of both the motor device 60 and the inverter device 80. The structure, function, and effect not particularly described in the seventh embodiment are the same as those in the first embodiment. In the seventh embodiment, the description will be centered on the points different from the first embodiment.

[0171] like Fig.12 As shown, the refrigerant passage 810 has a common peripheral path 813. The common peripheral path 813 is provided in a manner to cover both the motor 61 and the inverter 81 from the peripheral side. For example, the common peripheral path 813 is provided at a position to cover both the motor coil 211 and the arm switch unit 530 from the peripheral side. The common peripheral path 813 is a water cooling jacket for both the motor 61 and the inverter 81. The common peripheral path 813 is formed in a ring shape in a manner extending in the circumferential direction CD. The common peripheral path 813 is provided in both the motor housing 70 and the inverter housing 90. The common peripheral path 813 is in a state of being provided across the motor housing 70 and the inverter housing 90.

[0172] The common outer peripheral road 813 is provided at a position covering the motor coil 211 from the outer peripheral side. The common outer peripheral road 813 extends along the outer peripheral surface of the motor coil 211. The common outer peripheral road 813 can cool at least the motor coil 211 of the motor 61. The common outer peripheral road 813 cools the motor coil 211 from the outer peripheral side. The common outer peripheral road 813 is equivalent to a coil cooling path.

[0173] The common outer peripheral road 813 extends along the unit outer surface 101os so that the refrigerant RF flows along the unit outer surface 101os. The common outer peripheral road 813 is equivalent to the outer surface passage. The common outer peripheral road 813 is built into the unit shell 101. The common outer peripheral road 813 is set on the inner side of the unit outer surface 101os in the unit shell 101. The common outer peripheral road 813 is equivalent to the built-in passage. The common outer peripheral road 813 is set between the unit outer surface 101os and the unit inner surface 101is in the unit shell 101.

[0174] In the present embodiment, the common peripheral road 813 is included in both the motor device 60 and the inverter device 80. The common peripheral road 813 extends along the motor housing outer surface 70os and the inverter housing outer surface 90os so that the refrigerant RF flows along both the motor housing outer surface 70os and the inverter housing outer surface 90os. The common peripheral road 813 is built into the motor housing 70 and the inverter housing 90. The common peripheral road 813 is provided between the motor housing outer surface 70os and the inverter housing outer surface 90os in the motor housing 70. In addition, the common peripheral road 813 is provided between the inverter housing outer surface 90os and the inverter housing inner surface 90is in the inverter housing 90.

[0175] The common peripheral road 813 extends along both the motor peripheral wall surface 70c and the inverter peripheral wall surface 90c so that the refrigerant RF flows along both the motor peripheral wall surface 70c and the inverter peripheral wall surface 90c. The common peripheral road 813 is built into both the motor peripheral wall 71 and the inverter peripheral wall 91. The common peripheral road 813 is in a state of crossing the boundary portion of the motor peripheral wall 71 and the inverter peripheral wall 91 in the axial direction AD. The common peripheral road 813 extends in the axial direction AD in a manner of being mounted on the upstream plate 106 and the downstream plate 107. For example, the common peripheral road 813 is in a state of being mounted on the motor upstream wall 78 and the inverter downstream wall 99.

[0176] The common outer peripheral path 813 is provided between the motor outer peripheral wall surface 70c and the motor inner wall surface 71a in the motor outer peripheral wall 71. In addition, the common outer peripheral path 813 is provided between the inverter outer peripheral wall surface 90c and the inverter inner wall surface 91a in the inverter outer peripheral wall 91.

[0177] In the present embodiment, the unit liquid cooling part 821 forms a common peripheral path 813. The unit liquid cooling part 821 is included in both the motor housing 70 and the inverter housing 90. The unit liquid cooling part 821 has at least a portion of the motor peripheral wall 71 and at least a portion of the inverter peripheral wall 91. For example, both the motor peripheral wall 71 and the inverter peripheral wall 91 are the unit liquid cooling part 821. In the present embodiment, the motor unit 100 does not have the unit air cooling part 822.

[0178] In the present embodiment, the liquid cooling fin 835 is at least a part of the motor fin 72 and at least a part of the inverter fin 92. For example, both the motor fin 72 and the inverter fin 92 are liquid cooling fins 835. The motor fin 72 and the inverter fin 92, as liquid cooling fins 835, release the heat of the refrigerant RF flowing inside the motor peripheral wall 71 and the inverter peripheral wall 91 to the outside. In addition, in the present embodiment, the motor unit 100 does not have the air cooling fin 836.

[0179] The common outer peripheral road 813 is provided at a position parallel to both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. The common outer peripheral road 813 is equivalent to a common passage. The common outer peripheral road 813 is parallel to both the motor device 60 and the inverter device 80 in the radial direction RD in the direction orthogonal to the circumferential direction CD. In the present embodiment, since the common outer peripheral road 813 is located radially outside both the motor housing 70 and the inverter housing 90, the common outer peripheral road 813 is parallel to both the motor device 60 and the inverter device 80 in the radial direction RD. The common outer peripheral road 813 is provided on the outer peripheral side of both the motor device 60 and the inverter device 80.

[0180] The common outer peripheral path 813 is parallel to both the motor housing inner surface 70is and the inverter housing inner surface 90is in the radial direction RD. The refrigerant RF flowing in the common outer peripheral path 813 cools the motor device 60 and the inverter device 80 from the radial outer side. For example, the refrigerant RF flowing in the common outer peripheral path 813 cools the motor coil 211 and the arm switch unit 530 from the outer peripheral side.

[0181] like Fig.12As shown, in each of the motor device 60 and the inverter device 80, the heat transferred to the unit liquid cooling portion 821 is applied to the refrigerant RF as heat Hb. For example, the heat generated by the motor coil 211 and the arm switch portion 530, etc. is transferred from the motor space 74 and the inverter space 94 to the refrigerant RF as heat Hb. The heat Hb transferred to the refrigerant RF is transferred from the refrigerant RF to the motor fins 72 and the inverter fins 92 in the motor peripheral wall 71 and the inverter peripheral wall 91 as heat Hc, and is released from the motor fins 72 and the inverter fins 92 to the outside.

[0182] In the present embodiment, when the refrigerant pump 801 is driven, the refrigerant RF circulates in the refrigerant passage 810 so as to pass through the common outer peripheral path 813. In the common outer peripheral path 813, the refrigerant RF flows so as to circulate in the circumferential direction CD.

[0183] According to the present embodiment, the common outer peripheral road 813 extends along the axial direction AD in a manner of being bridged between the motor device 60 and the inverter device 80, and is provided on the outer peripheral side of each of the motor device 60 and the inverter device 80. In this structure, it is difficult to produce a deviation between the cooling effect of the common outer peripheral road 813 on the motor device 60 and the cooling effect of the common outer peripheral road 813 on the inverter device 80. That is, it is possible to suppress the insufficient cooling effect of the common outer peripheral road 813 on one of the motor device 60 and the inverter device 80. In this way, by suppressing the insufficient cooling effect of both the motor device 60 and the inverter device 80, the output density of the EPU 50 can be improved.

[0184] In the present embodiment, since both the motor device 60 and the inverter device 80 are cooled from the outer peripheral side by the common outer peripheral path 813, it is possible to sufficiently ensure the heat dissipation of both the motor device 60 and the inverter device 80. Therefore, the output can be increased without increasing the size of the motor device 60 and the inverter device 80, and the output density can be increased.

[0185] <Eighth Embodiment> In the seventh embodiment, the refrigerant passage 810 is provided so that the refrigerant RF flows on the outer peripheral side of the motor device 60 and the inverter device 80. In contrast, in the eighth embodiment, the refrigerant passage 810 is provided so that the refrigerant RF flows between the motor device 60 and the inverter device 80. The structure, function, and effect not particularly described in the eighth embodiment are the same as those in the seventh embodiment. In the eighth embodiment, the description will be centered on the points different from the seventh embodiment.

[0186] like Fig.13As shown, the refrigerant passage 810 has an axially-inserted path 814 in addition to the common outer peripheral path 813. The axially-inserted path 814 is provided between the motor 61 and the inverter 81 in the axial direction AD. The axially-inserted path 814 extends in a direction orthogonal to the axial direction AD. The axially-inserted path 814 extends along both the inner surface 70is of the motor housing and the inner surface 90is of the inverter housing so that the refrigerant RF flows along both the inner surface 70is of the motor housing and the inner surface 90is of the inverter housing.

[0187] The shaft clamping path 814 is provided on the partition plate 108 so as to extend along the partition plate 108. The shaft clamping path 814 is built into the partition plate 108. The shaft clamping path 814 extends along the boundary between the motor housing 70 and the inverter housing 90. For example, the shaft clamping path 814 is built into at least one of the motor downstream wall 79 and the inverter upstream wall 98. The unit liquid cooling portion 821 has at least a portion of the partition plate 108. For example, the partition plate 108 is the unit liquid cooling portion 821.

[0188] The shaft clamping path 814 is provided at a position parallel to both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. The shaft clamping path 814 is equivalent to a common path. The shaft clamping path 814 is parallel to both the motor device 60 and the inverter device 80 in the axial direction AD in the direction orthogonal to the circumferential direction CD. In the present embodiment, since the shaft clamping path 814 is located between the motor housing 70 and the inverter housing 90 in the axial direction AD, the shaft clamping path 814 is parallel to both the motor device 60 and the inverter device 80 in the axial direction AD.

[0189] The shaft-clamping path 814 is parallel to both the motor housing inner surface 70is and the inverter housing inner surface 90is in the axial direction AD. The shaft-clamping path 814 cools the motor device 60 and the inverter device 80 in the axial direction AD. For example, the shaft-clamping path 814 cools the motor device 60 from the downwind side of the external air wind Fo. In addition, the shaft-clamping path 814 cools the inverter device 80 from the upwind side of the external air wind Fo.

[0190] The partition plate 108 supports the downstream bearing 361. The downstream bearing 361 corresponds to the bearing portion. The partition plate 108 corresponds to the bearing support portion. The shaft clamping path 814 is built into the partition plate 108 to cool the partition plate 108. The shaft clamping path 814 corresponds to the support cooling path.

[0191] The shaft-clamping path 814 is connected to the common outer peripheral path 813. The shaft-clamping path 814 is provided radially inward of the common outer peripheral path 813. The outer peripheral end of the shaft-clamping path 814 is connected to the inner peripheral end of the common outer peripheral path 813. In the refrigerant passage 810, the refrigerant RF circulates in a manner flowing in both the common outer peripheral path 813 and the shaft-clamping path 814.

[0192] According to the present embodiment, the partition plate 108 supporting the downstream bearing 361 is cooled by the shaft interposing path 814. In this structure, the heat of the partition plate 108 is easily released to the refrigerant RF flowing in the shaft interposing path 814. Therefore, the heat accumulation in the partition plate 108 can be suppressed by the shaft interposing path 814.

[0193] In the structure in which the partition plate 108 serves as a bearing retaining member to retain the downstream bearing 361, in order to obtain high strength, the partition plate 108 has to be thickened and the volume has to be increased. Thus, when the volume of the partition plate 108 increases, the thermal mass of the partition plate 108 increases. Therefore, in the motor unit 100, even when the motor load temporarily increases, the heat of the motor coil 211 can be absorbed by the partition plate 108. Therefore, since the thermal mass of the partition plate 108 is large, the temporary increase in the temperature of the motor coil 211 can be suppressed. Thermal mass is the volume that can absorb heat.

[0194] Furthermore, in the present embodiment, since the partition plate 108 is cooled by the shaft-inserted path 814, the heat absorbed by the partition plate 108 from the motor coil 211 is easily released to the refrigerant RF. Even if the temperature of the partition plate 108 rises with a temporary increase in the motor load, the temperature of the partition plate 108 can be quickly lowered by the shaft-inserted path 814. Therefore, even if a temporary increase in the motor load occurs repeatedly, the shaft-inserted path 814 can suppress the degradation of the function of the partition plate 108 as a thermal mass.

[0195] In addition, the refrigerant passage 810 may have a motor peripheral passage 811 or an inverter peripheral passage 812 in addition to the shaft clamping passage 814. For example, the shaft clamping passage 814 may be connected to the motor peripheral passage 811 or the inverter peripheral passage 812. In addition, as long as the shaft clamping passage 814 can cool the partition plate 108, it may not be built in the partition plate 108. For example, the forming portion forming the shaft clamping passage 814 may be mounted on the partition plate 108.

[0196] In addition, the upstream plate 106 supports the upstream bearing 360. Therefore, the upstream bearing 360 may be used as a bearing portion, the upstream plate 106 may be used as a bearing support portion, and a support cooling path may be provided to cool the upstream plate 106. The support cooling path may be built into the upstream plate 106, for example.

[0197] <Ninth embodiment> In the first embodiment, the motor device 60 and the inverter device 80 are arranged in the axial direction AD. In contrast, in the ninth embodiment, the motor device 60 and the inverter device 80 are arranged in the radial direction RD. The structure, function, and effect not particularly described in the ninth embodiment are the same as those in the first embodiment. In the ninth embodiment, the description will be centered on the points different from the first embodiment.

[0198] like Fig.14 , Fig.15 As shown, the inverter device 80 is arranged on the outer peripheral side of the motor device 60. The inverter device 80 extends along the outer peripheral wall 71 of the motor in the circumferential direction CD. In the unit housing 101, the motor housing 70 and the inverter housing 90 are arranged in the radial direction RD. On the outer peripheral side of the motor housing 70, the inverter housing 90 and the motor fins 72 are arranged in the circumferential direction CD. For example, on the outer peripheral side of the motor housing 70, one inverter housing 90 extends along the outer peripheral wall 71 of the motor in the circumferential direction CD. In the area of ​​the outer peripheral side of the motor housing 70 where the inverter housing 90 is not provided, a plurality of motor housings 70 are arranged in the circumferential direction CD.

[0199] The unit housing 101 has a radial partition wall 109. The radial partition wall 109 partitions the unit space 102 in the radial direction RD. The radial partition wall 109 extends in a direction orthogonal to the radial direction RD. In the unit space 102, the motor space 74 and the inverter space 94 are arranged along the radial direction RD. The radial partition wall 109 is provided between the motor space 74 and the inverter space 94 to separate the motor space 74 from the inverter space 94. The radial partition wall 109 forms at least a portion of the motor housing 70 and the inverter housing 90. For example, the radial partition wall 109 forms at least a portion of the motor outer peripheral wall 71.

[0200] The refrigerant passage 810 has a radially interposed path 815 and an interposed extension path 816. Similar to the motor outer peripheral path 811 of the first embodiment, the radially interposed path 815 and the interposed extension path 816 are provided on the outer peripheral side of the motor device 60. The radially interposed path 815 and the interposed extension path 816 extend in the circumferential direction CD. The radially interposed path 815 and the interposed extension path 816 extend in the axial direction AD in a manner of being bridged on the motor upstream wall 78 and the motor downstream wall 79. The radially interposed path 815 and the interposed extension path 816 are arranged in the circumferential direction CD. The radially interposed path 815 and the interposed extension path 816 are connected to each other. The interposed extension path 816 is in a state of extending from the radially interposed path 815 in the circumferential direction CD.

[0201] The radial interposing path 815 and the interposing extension path 816 are provided at positions covering the motor coil 211 from the outer peripheral side. The radial interposing path 815 and the interposing extension path 816 extend along the outer peripheral surface of the motor coil 211. The radial interposing path 815 and the interposing extension path 816 can cool at least the motor coil 211 of the motor 61. The radial interposing path 815 and the interposing extension path 816 cool the motor coil 211 from the outer peripheral side. The radial interposing path 815 and the interposing extension path 816 are equivalent to the coil cooling path.

[0202] The radially interposed path 815 is provided between the motor 61 and the inverter 81 in the radial direction RD. The radially interposed path 815 extends along both the motor inner wall surface 71a and the inverter inner wall surface 91a so that the refrigerant RF flows along both the motor inner wall surface 71a and the inverter inner wall surface 91a. The interposed extension path 816 is provided between the motor 61 and the motor fin 72 in the radial direction RD. The interposed extension path 816 extends along the motor inner wall surface 71a so that the refrigerant RF flows along the motor inner wall surface 71a. In the refrigerant passage 810, the refrigerant RF circulates in a manner of flowing in both the radially interposed path 815 and the interposed extension path 816.

[0203] In the present embodiment, the unit liquid cooling section 821 forms a radial interposed path 815 and an interposed extension path 816. In the unit liquid cooling section 821, a portion where the radial interposed path 815 is formed is included in the radial partition wall 109. The radial interposed path 815 is built into the radial partition wall 109. In the unit liquid cooling section 821, a portion where the interposed extension path 816 is formed is included in the motor peripheral wall 71. The interposed extension path 816 is built into the motor peripheral wall 71. The interposed extension path 816 is equivalent to an outer surface path and a built-in path. On the outer peripheral side of the interposed extension path 816, the motor fin 72 is provided as a liquid cooling fin 835.

[0204] The radially-inserted path 815 is provided at a position parallel to both the motor device 60 and the inverter device 80 in a direction orthogonal to the circumferential direction CD. The radially-inserted path 815 is equivalent to a common path. The radially-inserted path 815 is parallel to both the motor device 60 and the inverter device 80 in the radial direction RD in the direction orthogonal to the circumferential direction CD. In the present embodiment, since the radially-inserted path 815 is located between the motor housing 70 and the inverter housing 90 in the radial direction RD, the radially-inserted path 815 is parallel to both the motor device 60 and the inverter device 80 in the radial direction RD.

[0205] According to the present embodiment, the radially interposed path 815 is provided in the radial direction RD between the motor device 60 and the inverter device 80. In this structure, the radially interposed path 815 can limit the heat transfer between the motor device 60 and the inverter device 80. Therefore, it is possible to suppress the heat transfer from one of the motor device 60 and the inverter device 80 to the other, thereby preventing the temperature of the other from being excessively high.

[0206] In the present embodiment, the radial clamping path 815 is provided on the inner circumference side of the inverter device 80. In this structure, it is not necessary to provide the radial clamping path 815 on the outer circumference side of the inverter device 80. In addition, it is not necessary to provide the radial clamping path 815 at a position parallel to the inverter device 80 in the radial direction RD. Therefore, the radial clamping path 815 can be shortened in the circumferential direction CD. In this way, by shortening the radial clamping path 815, the EPU 50 can be made lighter and the output density of the EPU 50 can be improved.

[0207] In addition, in the EPU 50, it is considered that the motor device 60 is more likely to reach a high temperature than the inverter device 80. In this case, since the heat of the motor device 60 is transferred to the inverter device 80, the temperature of the inverter device 80 may become too high. In contrast, in the present embodiment, before the heat of the motor device 60 is transferred to the inverter device 80, the heat of the motor device 60 is released to the refrigerant RF in the radially clamped path 815. Therefore, it is possible to suppress the temperature of the inverter device 80 from becoming too high due to the heat of the motor device 60. In addition, by using the radially clamped path 815 to promote the cooling of the inverter device 80, the output density of the EPU 50 can be improved.

[0208] <Tenth embodiment> In the ninth embodiment, the EPU 50 has one motor housing 70 and one inverter housing 90. In contrast, in the tenth embodiment, the EPU 50 has a plurality of inverter housings 90 for one motor housing 70. The structure, function, and effect not particularly described in the tenth embodiment are the same as those in the ninth embodiment. In the tenth embodiment, the description will be centered on the points different from the ninth embodiment.

[0209] like Fig.16 As shown, a plurality of inverter devices 80 are provided on the outer peripheral side of the motor device 60. A plurality of inverter devices 80 are arranged along the motor outer peripheral wall 71 and in the circumferential direction CD. Two inverter devices 80 adjacent to each other in the circumferential direction CD are located at positions away from each other in the circumferential direction CD. A motor fin 72 is provided between two inverter devices 80 adjacent to each other in the circumferential direction CD.

[0210] In the refrigerant passage 810, a plurality of radial intervening paths 815 and a plurality of intervening extension paths 816 are arranged in the circumferential direction CD. The radial intervening paths 815 and the intervening extension paths 816 are arranged alternately in the circumferential direction CD. In the unit liquid cooling portion 821, a portion where the radial intervening paths 815 are formed and a portion where the intervening extension paths 816 are formed are arranged alternately in the circumferential direction CD.

[0211] <Eleventh Embodiment> In the ninth embodiment, the inverter device 80 is not formed in a ring shape on the outer peripheral side of the motor device 60. In contrast, in the eleventh embodiment, the inverter device 80 is formed in a ring shape. The structure, function, and effect not particularly described in the eleventh embodiment are the same as those in the ninth embodiment. In the eleventh embodiment, the description will be centered on the points different from the ninth embodiment.

[0212] like Fig.17 , Fig.18 As shown, the inverter device 80 and the inverter housing 90 extend annularly along the outer peripheral wall 71 of the motor and in the circumferential direction CD. In the motor unit 100, the radial clamping path 815, the unit liquid cooling part 821 and the unit air cooling part 822 extend annularly in the circumferential direction CD together with the inverter device 80. The unit liquid cooling part 821 and the unit air cooling part 822 are included in the upstream plate 106 and the downstream plate 107. In the upstream plate 106 and the downstream plate 107, the part parallel to the radial partition wall 109 in the axial direction AD is the unit liquid cooling part 821, and the part located at a position deviated from the radial partition wall 109 in the radial direction RD is the unit air cooling part 822. In addition, the motor unit 100 does not have the motor fins 72 and the outer peripheral wall fins 831.

[0213] like Fig.17 As shown, the EPU 50 has an upstream wall fin 832 and a downstream wall fin 833. The upstream wall fin 832 and the downstream wall fin 833 are included in the motor unit 100. The upstream wall fin 832 and the downstream wall fin 833 are heat dissipation fins similar to the peripheral wall fin 831 of the first embodiment. The upstream wall fin 832 is provided on the unit upstream wall surface 101a. The downstream wall fin 833 is provided on the unit downstream wall surface 101b.

[0214] The upstream wall fin 832 and the downstream wall fin 833 extend in a direction orthogonal to the circumferential direction CD. The upstream wall fin 832 and the downstream wall fin 833 extend in the radial direction RD. The upstream wall fin 832 and the downstream wall fin 833 are in a state of being bridged on the motor housing 70 and the inverter housing 90 via the radial clamping path 815 in the radial direction RD. A plurality of the upstream wall fin 832 and the downstream wall fin 833 are arranged in the circumferential direction CD.

[0215] The upstream wall fin 832 and the downstream wall fin 833 include liquid cooling fins 835 and air cooling fins 836. Among the upstream wall fin 832 and the downstream wall fin 833, the portion provided in the unit liquid cooling part 821 is the liquid cooling fin 835, and the portion provided in the unit air cooling part 822 is the air cooling fin 836.

[0216] In the present embodiment, the air supply fan 121 is respectively arranged on the upstream side and the downstream side of the motor unit 100. The air supply fan 121 on the upstream side is arranged in such a manner that the external air wind Fo flows along the upstream wall fin 832 and in the radial direction RD. When the air supply fan 121 on the upstream side is driven, the heat of the upstream wall fin 832 is released radially outward together with the external air wind Fo. The air supply fan 121 on the downstream side is arranged in such a manner that the external air wind Fo flows along the downstream wall fin 833 and in the radial direction RD. When the air supply fan 121 on the downstream side is driven, the heat of the downstream wall fin 833 is released radially outward together with the external air wind Fo.

[0217] <Twelfth embodiment> In the first embodiment, the refrigerant passage 810 is not provided outside the unit casing 101. In contrast, in the twelfth embodiment, a portion of the refrigerant passage 810 is provided outside the unit casing 101. The structure, function, and effect not particularly described in the twelfth embodiment are the same as those in the first embodiment. In the twelfth embodiment, the description will be centered on the points different from the first embodiment.

[0218] like Fig.19 , Fig. 20 As shown, the EPU 50 has a radiator 850. The radiator 850 is included in the cooling device 800. The radiator 850 is a heat dissipation part for dissipating the heat of the refrigerant RF to the outside. The radiator 850 is provided on the outer peripheral side of the unit housing 101. The radiator 850 extends in a ring shape in the circumferential direction CD along the unit outer surface 101os.

[0219] The radiator 850 has a radiator fin 851, a radiator tube 852 and a radiator passage 853. The radiator fin 851 is provided on the unit peripheral wall surface 101c in the same manner as the peripheral wall fin 831 of the first embodiment described above. The radiator fin 851 is a heat dissipation fin that releases the heat of the refrigerant RF to the outside. The radiator fin 851 is formed of a metal material or the like and has thermal conductivity. The radiator fin 851 extends radially outward from the unit peripheral wall surface 101c. The radiator fin 851 is formed in a plate shape and extends in a direction orthogonal to the circumferential direction CD. The radiator fin 851 extends in the axial direction AD. A plurality of radiator fins 851 are arranged in the circumferential direction CD. The radiator fin 851 is fixed to the unit housing 101.

[0220] The radiator tube 852 is arranged at a position away from the unit outer surface 101os to the outside. The radiator tube 852 is equivalent to a separation tube portion. The radiator tube 852 is arranged at a position away from the unit outer peripheral wall surface 101c to the outside in the radial direction. The radiator tube 852 extends in a ring shape along the unit outer peripheral wall surface 101c and in the circumferential direction CD. The radiator tube 852 is formed of a metal material and the like and has thermal conductivity. The radiator tube 852 is in a state of penetrating the radiator fin 851 in the circumferential direction CD. The radiator tube 852 is in a state of being mounted on a plurality of radiator fins 851. The radiator tube 852 is formed in a flat shape and extends in a direction orthogonal to the radial direction RD.

[0221] The radiator passage 853 is included in the refrigerant passage 810. The radiator passage 853 is formed by the radiator tube 852. The radiator passage 853 extends along the unit outer surface 101os. The radiator passage 853 is equivalent to the outer surface passage. The radiator passage 853 is set at a position away from the unit outer surface 101os to the outside. The radiator passage 853 is equivalent to the separation passage. The radiator passage 853 extends in a direction orthogonal to the radial direction RD. The radiator passage 853 extends annularly along the unit outer peripheral wall surface 101c and in the circumferential direction CD. The radiator passage 853 extends along the axial direction AD.

[0222] The radiator fin 851 releases heat of the refrigerant RF flowing through the refrigerant passage 810 to the outside. The radiator fin 851 corresponds to the refrigerant fin. The radiator fin 851 supports the radiator tube 852. The radiator fin 851 corresponds to the supporting fin.

[0223] The radiator fin 851 includes an inner peripheral fin 851a and an outer peripheral fin 851b. The inner peripheral fin 851a and the outer peripheral fin 851b are arranged in the radial direction RD across the radiator tube 852. The inner peripheral fin 851a is provided on the inner peripheral side of the radiator tube 852. The inner peripheral fin 851a extends radially outward from the unit outer peripheral wall surface 101c. The inner peripheral fin 851a supports the radiator tube 852. The inner peripheral fin 851a is equivalent to the supporting fin portion.

[0224] The peripheral fin 851b is provided on the peripheral side of the radiator tube 852. The peripheral fin 851b extends radially outward from the radiator tube 852. The peripheral fin 851b is equivalent to an extended fin. The peripheral fin 851b is connected to the inner peripheral fin 851a via the radiator tube 852. In addition, in the radiator fin 851, the inner peripheral fin 851a and the peripheral fin 851b can also be formed integrally. In addition, the inner peripheral fin 851a and the outer peripheral fin 851b can also be formed independently of each other.

[0225] like Fig.19As shown, the refrigerant passage 810 has an internal passage 855. The internal passage 855 is connected to the radiator passage 853. The internal passage 855 is arranged in a manner that the refrigerant RF flows inside the unit housing 101. The internal passage 855 is arranged on the inner side of the unit inner surface 101is. The motor unit 100 has a passage forming portion that forms the internal passage 855. As the passage forming portion, there are the unit housing 101, the piping member, etc. The internal passage 855 is provided to cool the motor 61 and the inverter 81. The internal passage 855 is a portion of the refrigerant passage 810 that is accommodated in the unit space 102.

[0226] The internal passage 855 has a motor passage 856 and an inverter passage 857. The motor passage 856 is a portion of the refrigerant passage 810 that cools the motor device 60. The motor passage 856 is provided on the inner side of the motor housing inner surface 70is. The motor passage 856 is a portion of the internal passage 855 that is accommodated in the motor space 74. The motor passage 856 is provided to cool the motor 61. For example, the motor passage 856 extends along the motor coil 211 in a manner that cools the motor coil 211. The motor passage 856 is equivalent to a coil cooling passage.

[0227] The inverter passage 857 is a portion of the refrigerant passage 810 that cools the inverter device 80. The inverter passage 857 is provided on the inner side of the inverter housing inner surface 90is. The inverter passage 857 is a portion of the internal passage 855 that is accommodated in the inverter space 94. The inverter passage 857 is provided to cool the inverter 81. For example, the inverter passage 857 extends along the filter component 524, the arm switch portion 530, and the smoothing capacitor portion 580 to cool the filter component 524, the arm switch portion 530, and the smoothing capacitor portion 580.

[0228] In the refrigerant passage 810, the refrigerant RF circulates in a manner flowing through both the radiator passage 853 and the internal passage 855. In the internal passage 855, the refrigerant RF flows through both the motor passage 856 and the inverter passage 857. In the refrigerant passage 810, the refrigerant RF cooled by the radiator passage 853 reaches the motor passage 856 after passing through the inverter passage 857, and returns to the radiator passage 853 through the motor passage 856. After absorbing heat from the inverter passage 857, the refrigerant RF further absorbs heat from the motor passage 856, and then releases heat in the radiator passage 853.

[0229] According to the present embodiment, the internal passage 855 is provided in such a manner that the refrigerant RF flows inside the unit housing 101. In this structure, inside the unit housing 101, the arm switch unit 530 and other heat-generating components can be directly cooled by the refrigerant RF flowing in the internal passage 855. Therefore, the heat dissipation of the heat-generating components can be promoted. Moreover, inside the unit housing 101, since the degree of freedom associated with the position of the internal passage 855 is high, the degree of freedom associated with the position where the refrigerant RF flows is also high. Therefore, the position of the internal passage 855 can be set according to the position of the heat-generating component. That is, the degree of freedom associated with the position of the heat-generating component can be increased. For example, since the internal passage 855 is provided at a position where the arm switch unit 530 can be cooled, it is not necessary to arrange a plurality of arm switch units 530 along the unit inner wall surface 105a to be cooled by the external air wind Fo. Therefore, the degree of freedom of layout of heat-generating components such as the arm switch unit 530 can be increased.

[0230] According to the present embodiment, in the internal passage 855, the refrigerant RF flows through the motor passage 856 after flowing through the inverter passage 857. In this structure, the refrigerant RF can cool the inverter device 80 without applying heat from the motor device 60. Therefore, the cooling effect of the refrigerant RF on the inverter device 80 can be improved.

[0231] In the EPU 50, the motor device 60 is more likely to reach a high temperature than the inverter device 80. In contrast, in the present embodiment, the inverter device 80 can be cooled by the refrigerant RF in a state that is not heated by the motor device 60. Therefore, the motor device 60 can be cooled by the refrigerant RF in a state that is not overheated. In this way, both the motor device 60 and the inverter device 80 can be cooled efficiently, and the circulation flow rate of the refrigerant RF can be reduced. Therefore, the weight of the refrigerant RF and the refrigerant pump 801 can be reduced, and the output density of the EPU 50 can be improved.

[0232] According to the present embodiment, the radiator fin 851 supports the radiator tube 852 in a manner that releases the heat of the refrigerant RF flowing in the radiator passage 853. In this structure, the radiator fin 851 can be used to maintain the position of the radiator passage 853. Moreover, the radiator passage 853 is set at a position away from the unit outer surface 101os to the outside. In this structure, it is not necessary to build the radiator passage 853 into the unit casing 101 such as the unit peripheral wall 105. Therefore, the design freedom of the unit casing 101 can be improved. Therefore, the unit casing 101 that can improve the output density of the EPU 50 can be adopted.

[0233] According to the present embodiment, in the radial direction RD, the inner fin 851a is provided on the inner side of the radiator tube 852, and the outer fin 851b is provided on the outer side of the radiator tube 852. In this structure, the inner fin 851a and the outer fin 851b can be arranged in a manner to surround the periphery of the radiator tube 852. Therefore, the heat of the refrigerant RF flowing in the radiator tube 852 is easily released from the inner fin 851a and the outer fin 851b. For example, through the inner fin 851a and the outer fin 851b, heat can be released from the radiator tube 852 to the surroundings in a direction orthogonal to the circumferential direction CD. Therefore, the cooling effect of the EPU 50 can be improved by the inner fin 851a and the outer fin 851b.

[0234] In addition, the radiator fin 851 may also have only one of the inner peripheral fin 851a and the outer peripheral fin 851b. That is, the radiator fin 851 only needs to have at least one of the inner peripheral fin 851a and the outer peripheral fin 851b. In addition, a plurality of radiators 850 may be arranged in the circumferential direction CD. In this structure, it is preferred that the radiator passages 853 of each of the plurality of radiators 850 are connected to each other.

[0235] <Thirteenth embodiment> In the twelfth embodiment, the EPU 50 has a heat sink 850. In contrast, in the thirteenth embodiment, the EPU 50 has a common passage. The structure, function, and effect not particularly described in the thirteenth embodiment are the same as those in the twelfth embodiment. In the thirteenth embodiment, the description will be centered on the points different from the twelfth embodiment.

[0236] like Fig.21 , Fig. 22 As shown, the EPU 50 has a common outer peripheral path 813 as a common passage, similarly to the seventh embodiment. On the other hand, the EPU 50 does not have a radiator 850. The refrigerant passage 810 has a common outer peripheral path 813 and an internal passage 855. In the refrigerant passage 810, the common outer peripheral path 813 is connected to the internal passage 855. In the refrigerant passage 810, the refrigerant RF circulates in the common outer peripheral path 813 and the internal passage 855. In the EPU 50, the motor unit 100 is cooled from both the outside and the inside by the refrigerant RF flowing in the common outer peripheral path 813 and the internal passage 855.

[0237] In this embodiment, unlike the seventh embodiment, the EPU 50 does not have the liquid cooling fins 835. That is, the liquid cooling fins 835 are not provided in the unit liquid cooling part 821 having the common outer peripheral path 813. In this structure, the heat of the refrigerant RF flowing in the common outer peripheral path 813 is released to the outside in the unit liquid cooling part 821.

[0238] <Fourteenth embodiment> In the first embodiment, the air supply fan 121 is arranged on the upwind side of the external air wind Fo relative to the motor unit 100. In contrast, in the fourteenth embodiment, the air supply fan 121 is arranged on the downwind side of the external air wind Fo relative to the motor unit 100. The structure, function, and effect not particularly described in the fourteenth embodiment are the same as those in the first embodiment. In the fourteenth embodiment, the description will be centered on the points different from the first embodiment.

[0239] like Fig.23 As shown, the air supply fan 121 is only arranged on the downwind side of the external air wind Fo relative to the motor unit 100. The air supply fan 121 is arranged on the side opposite to the propeller 20 across the motor unit 100 in the axial direction AD. The air supply fan 121 supplies air toward the side opposite to the motor unit 100. In the present embodiment, the external air wind Fo is sucked by the air supply fan 121 on the downwind side, and the external air wind Fo flows along the axial direction AD. The air supply fan 121 on the downwind side is sometimes referred to as a suction fan. The air supply fan 121 is not arranged on the upwind side of the external air wind Fo relative to the motor unit 100.

[0240] In addition, if Fig.24 As shown in the figure, the air supply fan 121 may be arranged on the upwind side in addition to being arranged on the downwind side of the external air flow Fo relative to the motor unit 100. In this structure, the two air supply fans 121 are arranged in the axial direction AD across the motor unit 100. The air supply fan 121 on the upwind side of the two air supply fans 121 supplies air to the motor unit 100 in the same manner as in the first embodiment described above. On the other hand, the air supply fan 121 on the downwind side is arranged on the motor unit 100. Fig.23 The blower fan 121 shown similarly blows air toward the side opposite to the motor unit 100 .

[0241] <Fifteenth embodiment> In the first embodiment, the plurality of arm switch parts 530 are arranged in the radial direction RD. In contrast, in the fifteenth embodiment, the plurality of arm switch parts 530 are arranged in the circumferential direction CD. The structure, function, and effect not particularly described in the fifteenth embodiment are the same as those in the first embodiment. In the fifteenth embodiment, the description will be centered on the points different from the first embodiment.

[0242] like Fig.25As shown, a plurality of arm switch parts 530 are arranged along the driving peripheral end 512 and in the circumferential direction CD. The arm switch part 530 is arranged on the inner wall surface 91a of the inverter. The arm switch part 530 is arranged on the inner wall surface 91a of the inverter so that the heat of the arm switch part 530 is transferred to the outer peripheral wall 91 of the inverter. The arm switch part 530 and the outer peripheral wall 91 of the inverter directly exchange heat. For example, the arm switch part 530 contacts the inner wall surface 91a of the inverter. The arm switch part 530 is fixed to the outer peripheral wall 91 of the inverter by a fixing member such as a screw.

[0243] In addition, the arm switch 530 and the inverter inner wall 91a may not be in contact as long as the heat of the arm switch 530 can be transferred to the inverter outer peripheral wall 91. For example, a heat transfer member such as heat transfer gel may be provided between the arm switch 530 and the inverter inner wall 91a.

[0244] The arm switch section 530 includes a diode 87 in addition to the arm switch 86. In the arm switch section 530, the element forming the diode 87 is protected by a protection section.

[0245] In the inverter device 80, the smoothing capacitor unit 580 is provided at a position away from the arm switch unit 530 in the radial direction. The smoothing capacitor unit 580 is located at a position away from the driving outer peripheral end 512 in the radial direction. A plurality of smoothing capacitor units 580 are arranged along the driving outer peripheral end 512 in the circumferential direction CD. The smoothing capacitor unit 580 is formed in a rectangular parallelepiped shape as a whole so as to extend in the radial direction RD. In the smoothing capacitor unit 580, the long side portion extends in the radial direction RD, and the short side portion extends in the circumferential direction CD.

[0246] The filter component 524 is arranged at a position away from the arm switch part 530 in the radial direction inwardly similarly to the smoothing capacitor part 580. The filter component 524 is located at a position away from the smoothing capacitor part 580 in the radial direction inwardly similarly to the smoothing capacitor part 580. A plurality of filter components 524 are arranged in the circumferential direction CD. At least a portion of the filter components 524 is formed as a rectangular parallelepiped as a whole in a manner extending in the radial direction RD. The long side of at least a portion of the filter components 524 extends in the radial direction RD, and the short side extends in the circumferential direction CD.

[0247] Among the plurality of filter components 524, a plurality of Y capacitor portions 527 and a plurality of X capacitor portions 528 are arranged in the circumferential direction CD. The Y capacitor portions 527 and the X capacitor portions 528 are formed as a whole in a rectangular parallelepiped shape so as to extend in the radial direction RD. In the Y capacitor portions 527 and the X capacitor portions 528, the long sides extend in the radial direction RD, and the short sides extend in the circumferential direction CD.

[0248] In the inverter device 80, the radially outer parts are more likely to generate heat. The arm switch unit 530, the smoothing capacitor unit 580 and the filter component 524 are heat-generating components that generate heat when the power is turned on. The components in the inverter device 80 that are more likely to generate heat when the power is turned on are arranged radially outward. The arm switch unit 530 is more likely to generate heat than the smoothing capacitor unit 580 and the filter component 524. Therefore, the arm switch unit 530 is arranged at a position that is radially outward than any of the smoothing capacitor unit 580 and the filter component 524. For example, the arm switch unit 530 generates more heat than any of the smoothing capacitor unit 580 and the filter component 524, and is likely to become high temperature.

[0249] The filter component 524 is less likely to heat up than either the arm switch unit 530 or the smoothing capacitor unit 580. Therefore, the filter component 524 is provided at a position radially inward of either the arm switch unit 530 or the smoothing capacitor unit 580. For example, the filter component 524 is less likely to reach a high temperature than either the arm switch unit 530 or the smoothing capacitor unit 580.

[0250] In the plurality of filter components 524, the X capacitor unit 528 and the Y capacitor unit 527 are located radially inwardly of the smoothing capacitor unit 580. The X capacitor unit 528 and the Y capacitor unit 527 are located radially inwardly of the arm switch unit 530 together with the smoothing capacitor unit 580. The X capacitor unit 528 and the Y capacitor unit 527 are less likely to generate heat than the arm switch unit 530, similarly to the smoothing capacitor unit 580. The arm switch unit 530 is equivalent to a switch component. The smoothing capacitor unit 580, the X capacitor unit 528, and the Y capacitor unit 527 are equivalent to capacitor components.

[0251] According to the present embodiment, the arm switch unit 530 is arranged between the smoothing capacitor unit 580 and the filter component 524 and the inner wall surface 91a of the inverter in the radial direction RD. In this structure, since the arm switch unit 530 is located at a position close to the outer peripheral wall 91 of the inverter, the heat of the arm switch unit 530 is easily released from the outer peripheral wall 91 of the inverter to the outside. In addition, in this structure, in the path where the heat of the arm switch unit 530 is transferred to the inner wall surface 91a of the inverter, the smoothing capacitor unit 580 and the filter component 524 do not exist. Therefore, it is possible to suppress the heat of the arm switch unit 530 from accumulating in the smoothing capacitor unit 580 and the filter component 524 before being released from the outer peripheral wall 91 of the inverter to the outside. Therefore, by the positional relationship of the arm switch unit 530, the smoothing capacitor unit 580 and the filter component 524, the heat dissipation effect of the arm switch unit 530, the smoothing capacitor unit 580 and the filter component 524 can be improved.

[0252] According to the present embodiment, the arm switch unit 530 is provided on the inverter inner wall surface 91a in such a manner that the heat of the arm switch unit 530 is transferred to the inverter inner wall surface 91a. In this structure, the heat of the arm switch unit 530 is easily released to the outside through the inverter outer peripheral wall 91. Therefore, the cooling effect of the arm switch unit 530 can be improved.

[0253] In addition, in this embodiment, a common passage may be provided in the inverter peripheral wall 91, as in the inverter peripheral passage 812 of the fourth embodiment and the common peripheral passage 813 of the seventh embodiment. In this structure, since the arm switch unit 530 is provided at a position close to the common passage, the cooling effect of the refrigerant RF flowing in the common passage on the arm switch unit 530 can be improved.

[0254] <Other embodiments> The disclosure of this specification is not limited to the illustrated embodiments. The present disclosure includes the illustrated embodiments and the variations made by those skilled in the art based thereon. For example, the present disclosure is not limited to the combination of components and elements shown in the embodiments, and various variations can be made to implement it. The present disclosure can be implemented in various combinations. The present disclosure may have additional parts that can be added to the embodiments. The present disclosure includes a structure in which components and elements of the embodiments are omitted. The present disclosure includes the replacement or combination of components and elements between one embodiment and another. The technical scope of the present disclosure is not limited to the description of the embodiments. The technical scope of the present disclosure should be understood to be represented by the description of the claims, and also includes all variations in the meaning and scope equivalent to the description of the claims.

[0255] In the above-mentioned embodiments, the refrigerant passage 810 may be configured in any structure as long as both the motor device 60 and the inverter device 80 can be cooled by the refrigerant passage 810. For example, the refrigerant passage 810 may include all of the motor peripheral passage 811, the inverter peripheral passage 812, and the common peripheral passage 813, or may include at least one.

[0256] In addition, in the refrigerant passage 810, the internal passage 855 can also be arbitrarily set. For example, the passage forming portion that forms the internal passage 855 can also be not set in the unit space 102, but the unit space 102 itself becomes the internal passage 855. That is, the unit inner surface 101is can also form the internal passage 855. In this structure, the refrigerant RF flows directly into the unit space 102. In the unit space 102, the motor 61 or the inverter 81 can also be immersed in the refrigerant RF. For example, in the motor device 60, the motor coil 211 can also be immersed in the refrigerant RF. In the inverter device 80, the arm switch unit 530, the bus bar, the power card, the capacitor, etc. can also be immersed in the refrigerant RF.

[0257] In the above-mentioned embodiments, the EPU 50 may not have heat dissipation fins such as the peripheral wall fins 831. For example, as in the above-mentioned thirteenth embodiment, the liquid cooling fins 835 may not be provided for the unit liquid cooling portion 821. In this way, even if the EPU 50 does not have the liquid cooling fins 835, the refrigerant RF flowing in the unit liquid cooling portion 821 can be used to cool the motor device 60 and the inverter device 80.

[0258] In the above-mentioned embodiments, the refrigerant passage 810 only needs to cool the inside of the unit housing 101, and thus cool at least one of the motor device 60 and the inverter device 80. For example, the refrigerant passage 810 may cool only one of the motor device 60 and the inverter device 80. In the refrigerant passage 810, the internal passage 855 may be provided only in one of the motor space 74 and the inverter device 80.

[0259] In the above-described embodiments, at least one of the motor 61 and the inverter 81 may be accommodated in a housing case such as the unit housing 101. For example, the unit housing 101 may accommodate only one of the motor 61 and the inverter 81.

[0260] In each of the above-mentioned embodiments, the internal passage 855 only needs to be able to cool at least one of the motor device 60 and the inverter device 80. For example, the internal passage 855 may be provided in a manner to cool the motor device 60 and the inverter device 80 in a centralized manner. In addition, the internal passage 855 may be provided so as to cool the inverter device 80 after cooling the motor device 60.

[0261] In the above-mentioned embodiments, components such as the smoothing capacitor unit 580 and the arm switch unit 530 may be arranged arbitrarily inside the inverter housing 90. For example, a plurality of arm switch units 530 may be arranged in the radial direction RD as in the above-mentioned first embodiment, or may be arranged in the circumferential direction CD as in the above-mentioned fifteenth embodiment. In addition, the arm switch unit 530, the smoothing capacitor unit 580, and the filter component 524 may also be arranged in the circumferential direction CD.

[0262] In the above-mentioned embodiments, the motor 61 may not be a dual-rotor motor. For example, the motor 61 may be a single-rotor motor having one rotor. In addition, the motor 61 may not be an axial gap motor. For example, the motor 61 may be a radial gap motor. In the motor 61, for example, a stator is provided radially outside the rotor.

[0263] In the above-mentioned embodiments, the refrigerant pump 801 may not be an electric pump. For example, the refrigerant pump 801 may be a mechanical pump such as a centrifugal pump. In this structure, the refrigerant pump 801 causes the refrigerant RF to flow as the motor 61 is driven. The refrigerant pump 801 is provided on the motor shaft 340, for example.

[0264] In the above-mentioned embodiments, the air supply fan 121 may not be a mechanical fan. For example, the air supply fan 121 may be an electric fan having an electric motor. In this structure, the air supply fan 121 is driven by power supplied from the battery 31 or the like. The air supply fan 121 can supply air regardless of the driving state of the motor 61.

[0265] In each of the above-described embodiments, the EPU 50 may not include the air blowing fan 121. In this configuration, the propeller wind may be used for cooling the EPU 50 as the external air wind Fo.

[0266] In the above-mentioned embodiments, in the unit casing 101, the unit space 102 may not be divided into the motor space 74 and the inverter space 94. That is, the motor space 74 and the inverter space 94 may be continuous spaces. For example, in the above-mentioned first embodiment, the unit casing 101 may not have the partition plate 108.

[0267] In the above-mentioned embodiments, in the eVTOL 10, at least one propeller 20 may be driven by at least one EPU 50. For example, one propeller 20 may be driven by a plurality of EPUs 50, or a plurality of propellers 20 may be driven by one EPU 50.

[0268] In each of the above-mentioned embodiments, the eVTOL 10 may not be a tiltrotor. For example, in the eVTOL 10, the plurality of propellers 20 may include a propeller 20 for lifting and a propeller 20 for cruising. In the eVTOL 10, for example, the propeller 20 for lifting is driven when ascending, and the propeller 20 for cruising is driven when moving forward.

[0269] In the above-mentioned embodiments, the flying object equipped with the EPU 50 can be any electric flying object and may not be a vertical take-off and landing machine. For example, the flying object may be a flying object that can take off and land while sliding as an electric aircraft. In addition, the flying object may be a rotary wing aircraft or a fixed wing aircraft. The flying object may also be an unmanned flying object without a person on board.

[0270] In each of the above-mentioned embodiments, the mobile body equipped with the EPU 50 may be a non-flying body as long as it can be moved by the rotation of the rotating body. For example, the mobile body may be a vehicle, a ship, a construction machine, or an agricultural machine. For example, when the mobile body is a vehicle or a construction machine, the rotating body is a wheel for movement, and the output shaft is an axle. When the mobile body is a ship, the rotating body is a propeller for propulsion, and the output shaft is a propulsion shaft.

[0271] (Disclosure of technical ideas) This specification discloses multiple technical ideas recorded in the multiple items listed below. Some items are sometimes recorded by selectively citing a multiple dependent form of a previous item in a subsequent item. In addition, some items are sometimes recorded by citing a multiple dependent form of an item of other multiple dependent forms (a multiple dependent form referring to another multiple dependent form). These items recorded in multiple dependent forms define multiple technical ideas.

[0272] (Technical Thought A1) A driving device, wherein the driving device (50) is driven by electric power, wherein the driving device comprises: A motor device (60) having a motor (61) supplied with electric power; an inverter device (80), the inverter device having an inverter (81) for converting electric power supplied to the electric motor; A housing (101) for housing the motor and the inverter; and A cooling device (800) includes a refrigerant passage (810) for circulating a refrigerant (RF) and a refrigerant pump (801) for causing the refrigerant to flow in the refrigerant passage, and utilizes the refrigerant flowing in the refrigerant passage to cool both the motor device and the inverter device.

[0273] (Technical Thought A2) According to the driving device described in technical concept A1, The refrigerant passages have a common passage (811, 812, 813, 814, 815), The common passage extends in a circumferential direction (CD) relative to the rotation axis (Cm) of the motor, and is arranged side by side with the motor device and the inverter device in a direction (AD, RD) orthogonal to the circumferential direction so that the refrigerant cools both the motor device and the inverter device.

[0274] (Technical Thought A3) According to the driving device recorded in technical idea A2, the refrigerant passage has a motor peripheral path (811) as the common path, and the motor peripheral path is parallel to the inverter device in the axial direction (AD) of the rotation axis and is arranged on the outer peripheral side of the motor device.

[0275] (Technical Thought A4) According to the driving device described in technical idea A2 or A3, the refrigerant passage has an inverter peripheral path (812) as the common path, and the inverter peripheral path is arranged parallel to the motor device in the axial direction (AD) of the rotation axis and is arranged on the peripheral side of the inverter device.

[0276] (Technical Thought A5) According to a driving device recorded in any one of technical ideas A2 to A4, wherein, as the above-mentioned common passage, the above-mentioned refrigerant passage has a common peripheral road (813), and the above-mentioned common peripheral road extends in the axial direction (AD) of the above-mentioned rotation axis in a manner of being mounted on the above-mentioned motor device and the above-mentioned inverter device, and is arranged on the outer peripheral side of each of the above-mentioned motor device and the above-mentioned inverter device.

[0277] (Technical Thought A6) According to the driving device recorded in any one of the technical ideas A2 to A5, the refrigerant passage has a radially clamped path (815) as the common path, and the radially clamped path is arranged between the motor device and the inverter device in the radial direction (RD) of the rotation axis.

[0278] (Technical Thought A7) According to the driving device described in any one of technical concepts A1 to A6, the refrigerant passage has an internal passage (855, 856, 857), and the internal passage is configured to allow the refrigerant to flow inside the housing shell.

[0279] (Technical Thought A8) According to the driving device recorded in technical idea A7, the above-mentioned internal passage has a motor passage (856) for cooling the above-mentioned motor device and an inverter passage (857) for cooling the above-mentioned inverter device, and the above-mentioned internal passage is configured to allow the above-mentioned refrigerant to flow through the above-mentioned motor passage after flowing through the above-mentioned inverter passage.

[0280] (Technical Thought A9) According to the driving device described in any one of the technical ideas A1 to A8, The above-mentioned motor device has: A motor shaft (340), the motor shaft rotates as the motor is driven; a bearing portion (361) which rotatably supports the motor shaft; and A bearing support portion (108), the bearing support portion supports the bearing portion, The refrigerant passage includes a support cooling passage (814) for cooling the bearing support portion.

[0281] (Technical Thought A10) According to the drive device described in any one of technical concepts A1 to A9, the refrigerant passage has a coil cooling path (811, 813, 815, 816, 856) for cooling the coil (211) of the motor.

[0282] (Technical Thought A11) According to the driving device described in any one of the technical ideas A1 to A10, The inverter device (80) comprises the inverter and an inverter housing (90), wherein the inverter housing is contained in the housing housing and houses the inverter. The inverter device has: a switch component (530), the switch component being used to convert the electric power; and a capacitor component (527, 528, 580), the capacitor component being connected to the switch component in an electrically conductive manner, The switch component is provided between the capacitor component and an inner wall surface (91a) of the inverter housing in a radial direction (RD) of a rotation axis (Cm) of the motor.

[0283] (Technical Thought A12) According to the driving device described in technical idea A11, the switch component is disposed on the inner wall surface so that the heat of the switch component is transferred to the inner wall surface.

[0284] (Technical Thought A13) According to the driving device described in any one of the technical concepts A1 to A12, the driving device includes refrigerant fins (835, 851), wherein the refrigerant fins are arranged on the outer surface (101os) of the housing shell and release the heat of the refrigerant.

[0285] (Technical Thought A14) According to the driving device described in technical idea A13, it includes an air supply fan (121), which is arranged in the above-mentioned storage shell and supplies air in a manner that causes the gas (Fo) to flow along the above-mentioned refrigerant fins.

[0286] (Technical Thought A15) According to the driving device described in any one of technical ideas A1 to A14, the driving device is installed on a flying object (10) and drives the flying object to fly by electric power.

[0287] (Technical Thought B1) A driving device, wherein the driving device (50) is driven by electric power, wherein the driving device comprises: A motor device (60) having a motor (61) supplied with electric power; an inverter device (80), the inverter device having an inverter (81) for converting electric power supplied to the electric motor; A housing (101) for housing at least one of the motor and the inverter; a cooling device (800), the cooling device comprising a refrigerant passage (810) for circulating a refrigerant (RF) and a refrigerant pump (801) for causing the refrigerant to flow in the refrigerant passage, and cooling the interior of the housing shell by using the refrigerant flowing in the refrigerant passage; and Refrigerant fins (835, 851), the refrigerant fins are arranged on the outer surface (101os) of the housing shell which is the outer surface of the housing shell, and release the heat of the refrigerant.

[0288] (Technical Thought B2) According to the driving device described in technical concept B1, The refrigerant passage has an outer surface passage (811, 812, 813, 816, 853), The outer surface passage (811, 812, 813, 816, 853) extends along the outer surface of the housing shell so that the refrigerant flows along the outer surface of the housing shell. A plurality of the refrigerant fins are arranged along the outer surface passage to release heat of the refrigerant flowing in the outer surface passage.

[0289] (Technical Thought B3) According to the driving device described in technical concept B2, the driving device comprises: a passage built-in portion (821), the passage built-in portion being contained in the housing shell and forming the built-in passages (811, 812, 813, 816) built in the housing shell as the outer surface passages; and As the outer fin (835) of the refrigerant fin, the outer fin is arranged on the outside of the passage built-in part.

[0290] (Technical Thought B4) According to the driving device described in technical idea B2 or B3, the driving device comprises: A separation tube portion (852) which forms a separation passage (853) disposed at a position away from the outer surface of the housing shell toward the outside as the outer surface passage; and The supporting fin (851) serves as the refrigerant fin, and supports the separation tube portion and releases heat of the refrigerant flowing in the separation passage.

[0291] (Technical Thought B5) According to the driving device described in technical concept B4, The supporting fins have: an inner circumferential fin (851a), the inner circumferential fin being arranged on the inner side of the separation tube portion in the radial direction (RD) of the rotation axis (Cm) of the motor; and The peripheral fin (851b) is arranged on the outside of the separation tube portion in the radial direction.

[0292] (Technical Thought B6) A driving device according to any one of technical ideas B1 to B5, comprising a shell fin (836), wherein the shell fin is arranged along the outer surface of the housing shell and parallel to the refrigerant fin, and releases the heat of the housing shell.

[0293] (Technical Thought B7) According to the driving device described in technical idea B6, the refrigerant fins and the casing fins are arranged along the outer surface of the housing casing in the axial direction (AD) along which the rotation axis (Cm) of the motor extends.

[0294] (Technical Thought B8) According to the driving device described in any one of the technical ideas B1 to B7, the refrigerant passage has an internal passage (855, 856, 857), and the internal passage is configured to allow the refrigerant to flow inside the housing shell.

[0295] (Technical Thought B9) According to the driving device recorded in technical idea B8, the above-mentioned internal passage has a motor passage (856) for cooling the above-mentioned motor device and an inverter passage (857) for cooling the above-mentioned inverter device, and the above-mentioned internal passage is configured to allow the above-mentioned refrigerant to flow through the above-mentioned motor passage after flowing through the above-mentioned inverter passage.

[0296] (Technical Thought B10) According to the driving device described in any one of the technical ideas B1 to B9, The above-mentioned motor device has: A motor shaft (340), the motor shaft rotates as the motor is driven; a bearing portion (361) which rotatably supports the motor shaft; and A bearing support portion (108), the bearing support portion supports the bearing portion, The refrigerant passage includes a support cooling passage (814) for cooling the bearing support portion.

[0297] (Technical Thought B11) According to the drive device described in any one of technical concepts B1 to B10, the refrigerant passage includes a coil cooling path (811, 813, 815, 816, 856) for cooling the coil (211) of the motor.

[0298] (Technical Thought B12) According to the driving device described in any one of the technical ideas B1 to B10, The inverter device (80) comprises the inverter and an inverter housing (90), wherein the inverter housing is contained in the housing housing and houses the inverter. The inverter device has: a switch component (530), the switch component being used to convert the electric power; and a capacitor component (527, 528, 580), the capacitor component being connected to the switch component in an electrically conductive manner, The switch component is provided between the capacitor component and an inner wall surface (91a) of the inverter housing in a radial direction (RD) of a rotation axis (Cm) of the motor.

[0299] (Technical Thought B13) According to the driving device described in technical idea B12, the switch component is arranged on the inner wall surface so that the heat of the switch component is transferred to the inner wall surface (91a) of the inverter housing.

[0300] (Technical Thought B14) A driving device according to any one of technical ideas B1 to B13, comprising an air supply fan (121), the air supply fan being arranged in the housing casing and supplying air in a manner that causes the gas (Fo) to flow along the refrigerant fins.

[0301] (Technical Thought B15) According to the driving device described in any one of the technical ideas B1 to B14, the driving device is installed on a flying object (10) and drives the flying object to fly by electric power.

Claims

1. A driving device, the driving device (50) being driven by electricity, wherein: The driving device comprises: a motor device (60) having a motor (61) supplied with electric power; an inverter device (80) having an inverter (81) for converting electric power supplied to the electric motor; A housing (101) for housing at least one of the motor and the inverter; a cooling device (800) comprising a refrigerant passage (810) through which a refrigerant (RF) circulates and a refrigerant pump (801) for causing the refrigerant to flow in the refrigerant passage, and cooling the interior of the housing shell using the refrigerant flowing in the refrigerant passage; and Refrigerant fins (835, 851), which are arranged on the outer surface (101os) of the housing shell, which is the outer surface of the housing shell, and release the heat of the refrigerant.

2. The driving device according to claim 1, characterized in that: The refrigerant passage has an outer surface passage (811, 812, 813, 816, 853), The outer surface passage (811, 812, 813, 816, 853) extends along the outer surface of the housing shell so that the refrigerant flows along the outer surface of the housing shell. A plurality of refrigerant fins are arranged along the outer surface passage to release heat of the refrigerant flowing in the outer surface passage.

3. The driving device according to claim 2, characterized in that: The driving device comprises: a passage built-in portion (821) which is contained in the housing shell and forms a built-in passage (811, 812, 813, 816) built in the housing shell as the outer surface passage; and As the outer fin (835) of the refrigerant fin, the outer fin is arranged outside the passage built-in part.

4. The driving device according to claim 2 or 3, characterized in that: The driving device comprises: a separation tube portion (852) which forms a separation passage (853) disposed at a position away from the outer surface of the housing shell toward the outside as the outer surface passage; and The supporting fin (851) serves as the refrigerant fin, and supports the separation tube portion and releases heat of the refrigerant flowing in the separation passage.

5. The driving device according to claim 4, characterized in that: The supporting fin has: an inner peripheral fin (851a) provided on the inner side of the separation tube portion in a radial direction (RD) of a rotation axis (Cm) of the motor; and The peripheral fin (851b) is arranged on the outside of the separation tube portion in the radial direction.

6. The driving device according to any one of claims 1 to 3, characterized in that: It includes a shell fin (836) which is arranged along the outer surface of the receiving shell and parallel to the refrigerant fin and releases the heat of the receiving shell.

7. The driving device according to claim 6, characterized in that: The refrigerant fins and the housing fins are arranged along the outer surface of the housing case in an axial direction (AD) along which a rotation axis (Cm) of the motor extends.

8. The driving device according to any one of claims 1 to 3, characterized in that: The refrigerant passage has an internal passage (855, 856, 857), and the internal passage (855, 856, 857) is provided so that the refrigerant flows inside the housing shell.

9. The driving device according to claim 8, characterized in that The internal passage has a motor passage (856) for cooling the motor device and an inverter passage (857) for cooling the inverter device, and the internal passage is configured so that the refrigerant flows through the motor passage after flowing through the inverter passage.

10. The driving device according to any one of claims 1 to 3, characterized in that: The motor device comprises: a motor shaft (340) which rotates as the motor is driven; a bearing portion (361) that rotatably supports the motor shaft; and a bearing support portion (108), the bearing support portion supporting the bearing portion, The refrigerant passage has a support cooling passage (814) for cooling the bearing support portion.

11. The driving device according to any one of claims 1 to 3, characterized in that: The refrigerant passage has a coil cooling path (811, 813, 815, 816, 856) for cooling the coil (211) of the motor.

12. The driving device according to any one of claims 1 to 3, characterized in that: An inverter device (80) is provided, wherein the inverter device has the inverter and an inverter housing (90), wherein the inverter housing is contained in the housing housing and houses the inverter. The inverter device comprises: a switch component (530) for converting the electric power; and a capacitor component (527, 528, 580), the capacitor component being connected to the switch component in an electrically conductive manner, The switch component is provided between the capacitor component and an inner wall surface (91a) of the inverter housing in a radial direction (RD) of a rotation axis (Cm) of the motor.

13. The driving device according to claim 12, characterized in that: The switch component is arranged on the inner wall surface so that the heat of the switch component is transferred to the inner wall surface (91a) of the inverter housing.

14. The driving device according to any one of claims 1 to 3, characterized in that: It includes an air supply fan (121) which is arranged on the housing shell and supplies air in a manner that causes gas (Fo) to flow along the refrigerant fins.

15. The driving device according to any one of claims 1 to 3, characterized in that: The driving device is a driving device which is arranged on the flying object (10) and drives the flying object to fly by electric power.

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