Drive device

Abstract

An EPU (50) is provided with a motor unit (100), an air blower (120), and a labyrinth structure (700). The motor unit (100) has a motor (61), an inverter (81), and a unit case (101). A unit housing (101) houses a motor (61) and an inverter (81) in a unit space (102). In the unit housing (101), the unit inflow port (112) and the unit outflow port (114) communicate with the unit space (102). In an EPU (50), cooling air flows into a unit space (102) from a unit inlet (112) and flows out from a unit outlet (114) in accordance with the air blown by an air blowing device (120). Cooling air flows into the unit inflow port (112) after passing through the labyrinth structure part (700). In the labyrinth structure part (700), foreign matters are removed from the cooling air.

Description

Citation of related applications

[0001] This application is based on patent application No. 2022-128558 filed in Japan on August 11, 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 driving device for driving an aircraft to fly. The driving device includes a motor, an inverter, and a housing. The housing includes a cylindrical portion and heat dissipation fins. The motor and the inverter are accommodated inside the cylindrical portion. The heat dissipation fins are provided on the outer surface of the cylindrical portion to release the heat of the motor or the inverter to the outside of the housing. Prior art literature Patent Literature

[0004] Patent document 1: FR3089716 Summary of the invention

[0005] However, in the above-mentioned patent document 1, the heat of the motor or inverter is released to the outside air through the housing. In this structure, the outside air cools the motor or inverter indirectly through the housing. Thus, in the structure of indirectly cooling the motor or inverter, the cooling effect of the drive device may be insufficient.

[0006] An object of the present disclosure is to provide a driving device that can achieve cooling of the interior by cooling wind and can suppress the occurrence of abnormalities caused by foreign matter entering the interior.

[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: an electric motor, the electric motor being supplied with electric power; 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 housing inlet, the housing inlet being provided in the housing and allowing cooling air for cooling the interior of the housing to flow from the exterior of the housing into the interior; a housing outlet, the housing outlet being provided in the housing and allowing cooling air to flow out to the outside of the housing; and The foreign matter restricting portion restricts foreign matter from entering the interior of the receiving housing from the housing inlet.

[0009] According to the above-mentioned drive device, cooling air flows into the interior of the housing from the housing inlet, and flows out from the housing outlet to the outside of the housing. In this structure, the heat of the motor or inverter is directly applied to the cooling air inside the housing. Then, the heat is released from the housing outlet to the outside of the housing together with the cooling air. Therefore, the motor or inverter can be directly cooled by the cooling air inside the housing.

[0010] However, when the cooling air flows into the interior of the housing, foreign matter may enter the interior of the housing together with the cooling air. In contrast, according to the above-mentioned drive device, the foreign matter restriction portion can be used to restrict the entry of foreign matter from the housing inlet. Therefore, it is possible to suppress the abnormality of the drive device caused by foreign matter entering the interior of the housing.

[0011] Thus, in the drive device, cooling of the interior by the cooling air can be achieved, and occurrence of abnormality due to entry of foreign matter into the interior can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a longitudinal sectional view of the EPU in the first embodiment. Figure 2 is a cross-sectional view of an inverter device. Figure 3 This is a longitudinal cross-sectional view of the periphery of the maze structure in the EPU. Figure 4 It is a longitudinal cross-sectional view of the labyrinth structure. 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 longitudinal sectional view of the labyrinth structure part in the second embodiment. Figure 8 It is a longitudinal sectional view of the EPU in the third embodiment. Fig. 9 It is a longitudinal cross-sectional view of a centrifugal separator. Fig.10 It is a longitudinal sectional view of the EPU in the fourth embodiment. Fig.11 It is a longitudinal sectional view of the EPU in the fifth embodiment. Fig.12 It is a longitudinal cross-sectional view of the filter. Fig.13 It is a longitudinal sectional view of the EPU in the sixth embodiment. Fig.14 It is a longitudinal sectional view of the EPU in the seventh embodiment. Fig.15 It is a longitudinal sectional view of the EPU in the eighth embodiment. Fig.16 It is a longitudinal sectional view of the EPU in the ninth embodiment. Fig.17 It is a longitudinal sectional view of the EPU in the tenth embodiment. Fig.18 It is a longitudinal sectional view of the EPU in the eleventh embodiment. Fig.19 It is a longitudinal sectional view of the EPU in the twelfth embodiment. Fig. 20 It is a schematic longitudinal sectional view of the EPU in the thirteenth embodiment. Fig.21 It is a schematic longitudinal sectional view of the EPU in the fourteenth embodiment. Fig. 22 It is a schematic longitudinal sectional view of the EPU in the fifteenth embodiment. Fig.23 It is a schematic longitudinal sectional view of the EPU in the sixteenth embodiment. Fig.24 It is a schematic longitudinal sectional view of the EPU in the seventeenth embodiment. Fig.25 is a schematic cross-sectional view of the EPU. Fig.26 It is a schematic longitudinal sectional view of the EPU in the eighteenth embodiment. Fig. 27 is a schematic cross-sectional view of the EPU. DETAILED DESCRIPTION

[0013] 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.

[0014] <First embodiment> Figure 5The 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.

[0015] The eVTOL 10 has a fuselage 11 and a propeller 20. The fuselage 11 has a fuselage body 12 and wings 13. The fuselage body 12 is the body of the fuselage 11, and has a shape extending in the front and rear direction, for example. The fuselage body 12 has a passenger compartment for passengers to sit. The wings 13 extend from the fuselage body 12, and a plurality of wings are provided on the fuselage body 12. The wings 13 are fixed wings. The plurality of wings 13 include a main wing, a tail wing, and the like.

[0016] 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 provided on the fuselage body 12 and the wing 13, respectively. The propeller 20 rotates around the propeller axis. The propeller axis is, for example, the center line of the propeller 20. The propeller 20 enables the eVTOL 10 to generate thrust and lift. In addition, the propeller 20 is sometimes referred to as a rotor or a rotating blade.

[0017] 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 from the propeller head 22 in the radial direction of 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 from the propeller head 22 along the propeller axis. The propeller shaft is sometimes referred to as a propulsion shaft.

[0018] The eVTOL 10 is a tilt-rotor aircraft (Japanese: チルトロータ機). In the eVTOL 10, the propeller 20 can be tilted. That is, the pitch angle of the propeller 20 can be adjusted. For example, when the eVTOL 10 ascends, the orientation of the propeller 20 is set such that the propeller axis extends in the vertical direction. In this case, the propeller 20 functions as a lifting rotor for generating lift for the eVTOL 10. By the propeller 20 functioning as a lifting rotor, hovering and vertical takeoff and landing of the eVTOL 10 can be achieved. When the eVTOL 10 moves forward, the orientation of the propeller 20 is set such that the propeller axis extends in the front-rear direction. In this case, the propeller 20 functions as a cruising rotor for generating thrust for the eVTOL 10.

[0019] 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 enables power supply. The battery 31 is a power supply unit that supplies power to the EDS 50 and is equivalent to a power source 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. Additionally, as the power source unit, instead of or in addition to the battery 31, a fuel cell or a generator, etc. can also be used.

[0020] The distributor 32 is electrically connected to the battery 31 and a plurality of EPUs 50. The distributor 32 distributes the power from the battery 31 to the plurality of EPUs 50. The power distributed by the distributor 32 to the EPUs 50 is drive power for driving the EPUs 50.

[0021] The flight control device 40 controls the drive system 30. The flight control device 40 performs flight control for enabling the eVTOL 10 to fly. The flight control device 40 is connected to a plurality of EPUs 50 in a manner that enables communication. The flight control device 40 individually controls the plurality of EPUs 50. 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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. The motor coil is a winding that forms an armature. The motor coil is respectively provided in the U phase, the V phase, and the W phase. In addition, the motor 61 is equivalent to a rotary motor, and the EPU 50 is equivalent to a rotary motor unit.

[0026] exist Figure 6In 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.

[0027] 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.

[0028] The EPU 50 has an output line 143. The output line 143 is a power line for supplying electric power to the motor 61. The output line 143 electrically connects the motor 61 and the inverter 81. The output line 143 is in a state of being spanned between the motor device 60 and the inverter device 80.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 closer to the leeward side of the propeller wind than the propeller 20. As the propeller wind flows along the outer surface of the EPU 50, the heat of the EPU 50 is released to the propeller wind. In this way, the EPU 50 is cooled from the outside by the propeller wind. That is, the external cooling of the EPU 50 is performed by the propeller wind.

[0045] 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 at a position closer to the upwind side of the propeller wind than the inverter device 80. The motor device 60 is provided 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 axial direction AD is the direction in which the motor axis Cm extends.

[0046] 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. In the radial direction RD, the outer side is sometimes referred to as the radial outer side, and the inner side is sometimes referred to as the radial inner 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.

[0047] 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 2 The cross section of the inverter device 80 cut at right angles to the motor axis Cm is shown.

[0048] 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.

[0049] The motor unit 100 has a unit upstream wall surface 101a, a unit downstream wall surface 101b, and a unit peripheral wall surface 101c. These walls 101a to 101c are included in the outer surface of the motor unit 100. 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 along the circumferential direction CD. The motor space 74 is an inner space of the motor peripheral wall 71.

[0055] The inverter device 80 includes an inverter housing 90 in addition to the inverter 81. The inverter housing 90 accommodates the inverter 81. The inverter housing 90 includes 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 includes an inverter peripheral wall 91. The inverter peripheral wall 91 extends in a ring shape along the circumferential direction CD. The inverter space 94 is an inner space of the inverter peripheral wall 91.

[0056] 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 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 part on the upwind side is the motor housing 70, and the part on the leeward side is the inverter housing 90.

[0057] 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 is included in the unit upstream wall surface 101a. The motor peripheral wall surface 70c is included in the unit peripheral wall surface 101c. The motor inner wall surface 71a is included in the unit inner wall surface 105a. The motor peripheral wall surface 70c and the motor inner wall surface 71a are formed by the motor peripheral wall 71.

[0058] 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 outer 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 outer peripheral wall surface 90c and an inverter inner wall surface 91a. 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.

[0059] 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.

[0060] The motor 61 has 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 has a motor coil. 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The rotors 300a and 300b have magnets 310 and magnet holders 320. Multiple magnets 310 are arranged in the circumferential direction CD of 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 magnet holder 320 supports the magnets 310. The magnet holder 320 forms the outer contour of the rotors 300a and 300b as a whole. The magnet holder 320 is fixed to the shaft flange 342.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] like Figure 1 , Figure 2 As 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 outer peripheral end of the drive substrate 510. The drive peripheral end 512 is located at a position radially away from 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 outer 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. In the radial direction RD, the distance between the drive peripheral end 512 and the inverter inner wall surface 91a is greater than the distance between the control peripheral end 552 and the inverter inner wall surface 91a.

[0072] The drive substrate 510 has a first drive surface 510a and a second drive surface 510b. Of the pair of plate surfaces of the drive substrate 510, the plate surface on the partition plate 108 side is the first drive surface 510a, and the plate surface on the downstream plate 107 side is the second drive surface 510b. The second drive surface 510b extends along the control substrate 550. The drive substrate 510 is equivalent to a wiring substrate. The first drive surface 510a is equivalent to the first plate surface, and the second drive surface 510b is equivalent to the second plate surface.

[0073] The drive substrate 510 is a circuit substrate to which electric 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. In the drive substrate 510, the protruding dimensions of the filter components 524 and the protruding dimensions of the smoothing capacitor units 580 are larger than the distance between the drive substrate 510 and the control substrate 550 in the axial direction AD.

[0074] 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.

[0075] like Figure 2 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.

[0076] 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.

[0077] 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.

[0078] like Figure 1 , Figure 2As 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.

[0079] The arm switch unit 530 has a switch body and a switch terminal. The switch body has a MOSFET and other elements and a protection unit. The switch body is formed into a rectangular parallelepiped, for example. The switch terminal is a terminal such as a drain terminal extending from the switch body. In the arm switch unit 530, the switch body is located away from the drive substrate 510, and on the other hand, the switch terminal is connected to the drive substrate 510 in a manner that can be energized.

[0080] A plurality of arm switch parts 530 are arranged along the driving outer peripheral end 512. The arm switch parts 530 and the driving outer peripheral end 512 are arranged along the axial direction AD. The arm switch parts 530 are located at positions that straddle the driving outer peripheral end 512 in the radial direction RD. In the radial direction RD, the distance between the inverter inner wall surface 91a and the driving outer peripheral end 512 is smaller than the thickness dimension of the arm switch parts 530.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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 as power is turned on. The components in the inverter device 80 that are more likely to generate heat as 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 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.

[0088] 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.

[0089] 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.

[0090] 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 or the like. For example, the power connector 96 is connected to the battery 31 via a power cable or the like in a manner that allows power to flow. As an external device connected to the signal connector 97, there is a flight control device 40 or the like. For example, the signal connector 97 is connected to the flight control device 40 via a signal cable or the like in a manner that allows communication.

[0091] 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.

[0092] In the EPU 50, the cooling air Fa (refer to Figure 3 ) flows inside the motor unit 100. The cooling air Fa is a gas such as external air that flows inside the motor unit 100. External air is external air that flows into the inside of the EPU 50 from the outside. For example, when the cooling air Fa flows into the unit space 102, heat from the motor 61 or the inverter 81 is applied to the cooling air Fa, and the heat is released to the outside of the motor unit 100 together with the cooling air Fa. In this way, the EPU 50 is cooled from the inside by the cooling air Fa.

[0093] The motor unit 100 has a unit inflow hole 111 and a unit inflow port 112. The unit inflow port 112 is an inflow port for allowing cooling air Fa to flow from the outside of the unit casing 101 into the unit space 102. The unit inflow port 112 is provided on the outer surface of the unit casing 101. The unit inflow port 112 corresponds to the casing inlet.

[0094] The unit inflow hole 111 is provided in the unit housing 101. The unit inflow hole 111 communicates with the unit space 102. The unit inflow hole 111 opens the unit space 102 to the outside of the motor unit 100. The unit inflow hole 111 forms a unit inflow port 112. The outer end of the unit inflow hole 111 is the unit inflow port 112.

[0095] The motor unit 100 has a unit outflow hole 113 and a unit outflow port 114. The unit outflow port 114 is an outflow port for allowing the cooling air Fa to flow out of the unit space 102 to the outside of the unit casing 101. The unit outflow port 114 is provided on the outer surface of the unit casing 101. The unit outflow port 114 corresponds to the casing outflow port.

[0096] The unit outflow hole 113 is a hole penetrating the unit housing 101. The unit outflow hole 113 communicates with the unit space 102. The unit outflow hole 113 opens the unit space 102 to the outside of the motor unit 100. The unit outflow hole 113 forms a unit outflow port 114. The outer end of the unit outflow hole 113 is the unit outflow port 114.

[0097] In the motor unit 100, the inlet area Sin and the outlet area Sout are of the same degree. Even if there is a difference between the inlet area Sin and the outlet area Sout, the difference is included in the allowable range. The inlet area Sin is the area of ​​the unit inlet 112. The outlet area Sout is the area of ​​the unit outlet 114. For example, the area ratio RA is included in the allowable range. The area ratio RA is the ratio of the inlet area Sin to the outlet area Sout. The area ratio RA is, for example, a value obtained by dividing the inlet area Sin by the outlet area Sout. That is, RA=Sin / Sut holds. The allowable range is the range between 0.8 and 1.2. That is, 0.8<RA<1.2 holds.

[0098] In the present embodiment, the cooling air Fa flowing into the interior of the motor unit 100 cools the inverter 81 after cooling the motor 61. The motor unit 100 has a motor inlet 111A and a motor inlet 112A as a unit inlet hole 111 and a unit inlet 112. The motor inlet 112A is an inlet for allowing the cooling air Fa to flow from the outside of the unit housing 101 into the motor space 74. The motor inlet 112A is provided on the outer surface of the motor housing 70. For example, the motor inlet 112A is provided on the upstream wall surface 70a of the motor. The motor inlet 112A is equivalent to the housing inlet.

[0099] The motor inlet hole 111A is provided in the motor housing 70. The motor inlet hole 111A communicates with the motor space 74. For example, the motor inlet hole 111A penetrates the upstream plate 106 in the axial direction AD. The motor inlet hole 111A is provided between the shaft body 341 and the stator 200 in the radial direction RD. The motor inlet hole 111A is located in a position closer to the shaft body 341 than the motor outer peripheral wall 71 in the radial direction RD. A plurality of motor inlet holes 111A are arranged in the circumferential direction CD.

[0100] The motor unit 100 has an inverter outflow hole 113B and an inverter outflow hole 114B as the unit outflow hole 113 and the unit outflow hole 114. The inverter outflow hole 114B is an outflow hole for allowing the cooling air Fa to flow out from the inverter space 94 to the outside of the motor unit 100. The inverter outflow hole 114B is provided on the outer surface of the inverter housing 90. For example, the inverter outflow hole 114B is provided on the inverter downstream wall surface 90b. The inverter outflow hole 114B is equivalent to the housing outflow hole.

[0101] The inverter outflow hole 113B is provided in the inverter housing 90. The inverter outflow hole 113B communicates with the inverter space 94. For example, the inverter outflow hole 113B penetrates the downstream plate 107 along the axial direction AD. The inverter outflow hole 113B is provided at the center of the downstream plate 107. The center of the inverter outflow hole 113B is located at a position where the motor axis Cm passes. The inner diameter of the inverter outflow hole 113B is, for example, larger than the outer diameter of the shaft body 341.

[0102] The motor unit 100 has a unit connection hole 115. The unit connection hole 115 connects the motor space 74 and the inverter space 94 in a ventilated manner. The cooling air Fa flows from the motor space 74 through the unit connection hole 115 and into the inverter space 94. As the unit connection hole 115, the motor unit 100 has a plate connection hole 115A. The plate connection hole 115A penetrates the partition 108 along the axial direction AD. The plate connection hole 115A is arranged between the shaft body 341 and the stator 200 in the radial direction RD. The plate connection hole 115A is at least arranged at a position closer to the radial inside than the smoothing capacitor part 580. For example, the plate connection hole 115A is located at a position closer to the radial inside than the filter component 524. The plate connection hole 115A is located at an inner position closer to the shaft body 341 than the unit outer peripheral wall 105 in the radial direction RD. A plurality of plate connection holes 115A are arranged in the circumferential direction CD.

[0103] The EPU 50 includes an air supply device 120. The air supply device 120 is a device for causing cooling air Fa to flow inside the motor unit 100. As the air supply device 120 supplies air, the cooling air Fa flows into the motor space 74 and flows out to the outside after passing through the inverter space 94. The air supply device 120 causes the cooling air Fa to flow by driving the motor 61. The air supply device 120 supplies air as the motor 61 is driven, and stops supplying air as the motor 61 stops being driven.

[0104] The air supply device 120 is provided outside the motor unit 100. The air supply device 120 is arranged in parallel with the motor unit 100 in the axial direction AD. The air supply device 120 is provided on the upwind side of the propeller wind relative to the motor unit 100. The air supply device 120 is located at a position where the cooling air Fa can flow into the motor inlet 112A. The air supply device 120 is provided on the upwind side of the motor inlet 112A.

[0105] The air supply device 120 includes an air supply fan 121 and an air supply housing 125. The air supply housing 125 accommodates the air supply fan 121. The air supply housing 125 covers the motor inlet 112A from the outside. The air supply housing 125 includes a housing space 126. The housing space 126 is an internal space of the air supply housing 125. The air supply housing 125 includes a housing outer surface 125a and a housing inner surface 125b. The housing outer surface 125a is the outer surface of the air supply housing 125. The housing inner surface 125b is the inner surface of the air supply housing 125 and forms the housing space 126.

[0106] The air supply housing 125 has a housing inlet 127 and a housing outlet 128. The housing inlet 127 and the housing outlet 128 open the housing space 126 to the outside of the air supply housing 125. The housing inlet 127 is an inlet for allowing the cooling air Fa to flow into the housing space 126. The housing inlet 127 opens the housing space 126 in a direction orthogonal to the axial direction AD. For example, the housing inlet 127 opens the housing space 126 toward the radially outer side.

[0107] The housing outlet 128 is an outlet for allowing cooling air Fa to flow out of the housing space 126. The housing outlet 128 communicates with the motor inlet 112A. The housing outlet 128 connects the housing space 126 and the motor inlet 112A in a ventilated manner. The housing outlet 128 and the motor inlet 112A are arranged along the axial direction AD. Similar to the motor inlet 112A, a plurality of housing outlets 128 are arranged in the circumferential direction CD.

[0108] The air supply fan 121 is a fan capable of conveying cooling air Fa. The air supply fan 121 is equivalent to a cooling air fan. The air supply fan 121 is housed in a housing space 126. The air supply fan 121 is connected to the motor 61 via the EPU shaft 51. The air supply fan 121 is provided on the EPU shaft 51 outside the motor unit 100. The air supply fan 121 rotates together with the EPU shaft 51 about the motor axis Cm. The air supply fan 121 is an axial flow fan and supplies air along the axial direction AD. In the air supply device 120, as the air supply fan 121 rotates, the cooling air Fa flowing in from the housing inlet 127 flows out from the housing outlet 128. The cooling air Fa flowing out from the housing outlet 128 flows into the motor inlet 112A.

[0109] 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 blade 122 extends 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. The air supply blade 122 is in a state of extending radially outward from the EPU shaft 51. At least a portion of the air supply blade 122 is located in a position parallel to the housing outlet 128 in the axial direction AD.

[0110] When the air supply fan 121 is supplying air, Figure 3 As shown, the cooling air Fa flows into the motor space 74 from the motor inlet 112A, passes through the inverter space 94, and flows out from the inverter outlet 114B.

[0111] In the motor space 74, at least a portion of the cooling air Fa flows through the motor gap 450. The motor gap 450 is included in the motor space 74 and is a gap through which the cooling air Fa flows. The motor gap 450 is a labyrinth-shaped long space, and is formed in a shape that is bent at multiple locations. The motor gap 450 has multiple curved portions. In the motor gap 450, multiple locations extending in the radial direction RD are arranged along the axial direction AD between the motor inlet 112A and the unit connection hole 115. The motor gap 450 extends annularly in the circumferential direction CD along the motor inner wall surface 71a.

[0112] The motor gap 450 includes a first outer gap 451, a second outer gap 452, and an inner gap 453. The first outer gap 451 and the second outer gap 452 are arranged in the axial direction AD with the inner gap 453 interposed therebetween. The inner gap 453 connects the first outer gap 451 and the second outer gap 452. The first outer gap 451 communicates with the motor inlet 112A. The second outer gap 452 communicates with the unit connection hole 115. The outer gaps 451, 452, and the inner gap 453 all have a portion extending in the radial direction RD and at least one curved portion.

[0113] The first outer gap 451 is a gap between the first rotor 300a and the motor housing 70. In the first outer gap 451, the gap between the first rotor 300a and the upstream plate 106 extends in the radial direction RD. The second outer gap 452 is a gap between the second rotor 300b and the motor housing 70. In the second outer gap 452, the gap between the second rotor 300b and the downstream plate 107 extends in the radial direction RD.

[0114] The inner gap 453 is a gap between the rotors 300a, 300b and the stator 200. In the inner gap 453, a first axial gap 453a and a second axial gap 453b extend in the radial direction RD. The first axial gap 453a is a gap between the first rotor 300a and the stator 200. The second axial gap 453b is a gap between the second rotor 300b and the stator 200.

[0115] In the motor space 74, at least a portion of the cooling air Fa flowing in from the motor inlet 112A flows into the motor gap 450. The cooling air Fa flows through the motor gap 450 in a manner that flows along the outer surface of the rotor 300a, 300b and the outer surface of the stator 200. The cooling air Fa cools the rotor 300a, 300b and the stator 200 by flowing through the motor gap 450. In the motor gap 450, the cooling air Fa flows toward the radial outside in the first outer gap 451 and flows toward the radial inside in the first axial gap 453a of the inner gap 453. Thereafter, the cooling air Fa flows toward the radial outside in the second axial gap 453b and flows toward the radial inside in the second outer gap 452. Then, the cooling air Fa flows from the motor gap 450 into the inverter space 94 via the unit connection hole 115.

[0116] In the inverter space 94, the first drive space 94a is communicated with the unit connection hole 115. The second drive space 94b is communicated with the inverter outlet 114B. The first drive space 94a and the second drive space 94b are connected in a ventilated manner through the drive gap 94c. The drive gap 94c is included in the inverter space 94. The drive gap 94c is a gap between the drive substrate 510 and the inverter peripheral wall 91. The drive gap 94c is a space between the drive peripheral end 512 and the inverter inner wall surface 91a. The drive gap 94c extends annularly along the drive peripheral end 512 and in the circumferential direction CD. The drive gap 94c is equivalent to the substrate gap.

[0117] In the inverter space 94, the cooling wind Fa flows into the first drive space 94a from the unit connection hole 115. The cooling wind Fa flows from the unit connection hole 115 toward the drive gap 94c and toward the radial outside. The cooling wind Fa passes through the filter component 524 and reaches the smoothing capacitor part 580, and then passes through the arm switch part 530 and reaches the drive gap 94c. The cooling wind Fa cools the smoothing capacitor 145 after cooling the filter component 524, and then cools the arm switch part 530. The cooling wind Fa cools the drive substrate 510 by flowing along the first drive surface 510a.

[0118] The cooling air Fa flows from the drive gap 94c into the second drive space 94b after cooling the arm switch portion 530. The cooling air Fa flows radially inward in the second drive space 94b. The cooling air Fa cools the drive substrate 510 by flowing along the second drive surface 510b. After reaching the substrate opening 553 from the second drive space 94b, the cooling air Fa passes through the substrate opening 553 and flows out from the unit outflow hole 113 to the outside.

[0119] It is difficult for the flow rate or flow rate of the cooling air Fa to become too large inside the motor unit 100. For example, the cooling air Fa limits the flow rate and flow rate of the cooling air Fa by flowing through the labyrinth-shaped motor gap 450. That is, due to the pressure loss generated when the cooling air Fa flows through the motor gap 450, it is possible to suppress the flow rate or flow rate of the cooling air Fa from becoming too large. Therefore, it is possible to suppress the occurrence of abnormalities in the motor unit 100 due to the excessive flow rate or flow rate of the cooling air Fa.

[0120] For example, unlike the present embodiment, it is assumed that the motor space 74 does not have a structure having a labyrinth-shaped motor gap 450. In this structure, the flow velocity and flow rate of the cooling air Fa are not restricted and are likely to become too large. When the flow velocity or flow rate of the cooling air Fa becomes too large, for example, an abnormality such as a mounting component mounted on the drive substrate 510 or the control substrate 550 is likely to fall off. In contrast, as in the present embodiment, if the flow velocity or flow rate of the cooling air Fa is restricted by the labyrinth-shaped motor gap 450, etc., an abnormality such as a mounting component falling off is unlikely to occur.

[0121] In addition, inside the motor unit 100, it is easy to cool the motor 61 and the inverter 81 by the cooling air Fa. For example, in the motor space 74, the cooling air Fa flows in a manner of making multiple turns in the radial direction RD by flowing in the motor gap 450. In addition, in the inverter space 94, since the drive gap 94c is located at a position away from the unit connection hole 115 and the unit outflow hole 113 to the radial outside, the cooling air Fa flows in a manner of making multiple turns in the radial direction RD. As described above, in either the motor space 74 or the inverter space 94, the flow path of the cooling air Fa becomes longer. Therefore, the contact area of ​​the cooling air Fa with the motor 61 or the inverter 81 becomes larger, and it is easy for the motor 61 or the inverter 81 to apply heat to the cooling air Fa. That is, the cooling effect of the cooling air Fa on the motor 61 or the inverter 81 is easy to become higher.

[0122] like Figure 1 , Figure 4 As shown, the EPU 50 has a labyrinth structure 700. The labyrinth structure 700 restricts foreign matter MF such as water and garbage (see Figure 4) enters the interior of the motor unit 100 from the motor inlet 112A. The labyrinth structure 700 is equivalent to the foreign matter restricting portion. The labyrinth structure 700 is installed on the air supply device 120. The labyrinth structure 700 is arranged outside the housing inlet 127. The labyrinth structure 700 restricts the foreign matter MF from entering the housing inlet 127 to restrict the foreign matter MF from entering the unit space 102.

[0123] The labyrinth structure 700 has a labyrinth passage 710. The labyrinth passage 710 is a labyrinth-shaped long passage, and is formed in a shape bent at multiple locations. The labyrinth passage 710 has multiple bends. The labyrinth passage 710 is a curved passage. In the labyrinth structure 700, foreign matter MF is removed from the cooling air Fa by the cooling air Fa passing through the labyrinth passage 710.

[0124] The labyrinth passage 710 has a labyrinth inlet 711 and a labyrinth outlet 712. The labyrinth inlet 711 is an inlet for allowing cooling air Fa to flow into the labyrinth passage 710. The labyrinth outlet 712 is an outlet for allowing cooling air Fa to flow out of the labyrinth passage 710. The labyrinth inlet 711 and the labyrinth outlet 712 are arranged in the radial direction RD. In the labyrinth passage 710, between the labyrinth inlet 711 and the labyrinth outlet 712 in the radial direction RD, a plurality of portions extending in the axial direction AD are arranged in the radial direction RD.

[0125] like Figure 4 As shown, the labyrinth structure 700 includes a labyrinth housing 701, a labyrinth partition plate 702, a labyrinth support portion 705, and a labyrinth engaging portion 706. The labyrinth housing 701, the labyrinth partition plate 702, the labyrinth support portion 705, and the labyrinth engaging portion 706 are formed of a resin material or the like. The labyrinth housing 701 covers the housing inlet 127 from the outside. The labyrinth housing 701 is formed in a cylindrical shape as a whole and extends in the radial direction RD. The labyrinth partition plate 702 separates the internal space of the labyrinth housing 701 so that the internal space of the labyrinth housing 701 becomes a labyrinth passage 710. The labyrinth support portion 705 supports the labyrinth housing 701. The labyrinth engaging portion 706 fixes the labyrinth support portion 705 to the air supply housing 125. The labyrinth engaging portion 706 is, for example, in a state of being hooked on the housing inner surface 125b.

[0126] The labyrinth inlet 711 and the labyrinth outlet 712 are arranged on the outer surface of the labyrinth housing 701. The labyrinth outlet 712 is connected to the shell inlet 127. The labyrinth inlet 711 is open to the leeward side of the propeller wind. The labyrinth inlet 711 is open to the side opposite to the propeller 20 in the axial direction AD. The labyrinth inlet 711 is not open to the upwind side of the propeller wind. In addition, a plurality of labyrinth inlets 711 may be provided on the outer surface of the labyrinth housing 701. Preferably, the plurality of labyrinth inlets 711 do not include a labyrinth inlet 711 open to the upwind side of the propeller wind.

[0127] When the air supply fan 121 supplies air, the cooling air Fa flows into the labyrinth passage 710 by being sucked in from the labyrinth inlet 711. The cooling air Fa passes through the labyrinth passage 710 and reaches the housing space 126. When a foreign object MF enters the labyrinth inlet 711 together with the cooling air Fa, the foreign object MF is likely to be hooked on the inner surface of the labyrinth passage 710. For example, the foreign object MF is likely to be hooked on the labyrinth partition plate 702. Thus, in the labyrinth structure 700, even if a foreign object MF enters the labyrinth inlet 711, it is difficult for the foreign object MF to reach the labyrinth outlet 712.

[0128] Since the labyrinth inlet 711 faces the leeward side of the propeller wind, it is difficult for foreign matter MF to enter the labyrinth inlet 711 together with the propeller wind. In addition, when the angle of the EPU 50 changes with the change of the pitch angle of the propeller 20, the direction of the labyrinth inlet 711 changes. For example, when the propeller 20 functions as a lift rotor, the labyrinth inlet 711 faces downward. In this case, even if it is assumed that the foreign matter MF enters the labyrinth inlet 711 together with the cooling wind Fa, the foreign matter MF will be easily discharged to the outside from the labyrinth outlet 712 due to its own weight. In addition, when the propeller 20 functions as a cruising rotor, the labyrinth inlet 711 faces the rear of the eVTOL 10. Therefore, it is difficult for the cruising wind generated by the cruising of the eVTOL 10 to flow into the labyrinth inlet 711. Therefore, it is difficult for foreign matter MF to enter the labyrinth inlet 711 together with the cruising wind.

[0129] like Figure 1 As shown, the EPU 50 has an outlet filter 720. The outlet filter 720 is arranged relative to the unit outlet 114. The outlet filter 720 covers the unit outlet 114 from the outside. The outlet filter 720 is fixed to the unit outer peripheral wall 101c by an adhesive or the like. The outlet filter 720 restricts foreign matter MF from entering the unit space 102 from the unit outlet 114. For example, the outlet filter 720 restricts the passage of water, but allows the passage of moisture or water vapor. For example, the outlet filter 720 is attached to the inverter downstream wall 90b in a manner covering the inverter outlet 114B. The outlet filter 720 restricts foreign matter MF from entering the inverter space 94 from the inverter outlet 114B.

[0130] According to the present embodiment described above, the cooling air Fa flows into the interior of the unit casing 101 from the unit inlet 112, and flows out from the unit outlet 114 to the outside of the unit casing 101. In this structure, the heat of the motor 61 or the inverter 81 is directly applied to the cooling air Fa inside the unit casing 101. And, the heat is released from the unit outlet 114 to the outside of the unit casing 101 together with the cooling air Fa. Therefore, inside the unit casing 101, the motor 61 or the inverter 81 can be directly cooled by the cooling air Fa. That is, the internal cooling of the motor unit 100 can be performed by the cooling air Fa.

[0131] In addition, when the cooling air Fa flows into the interior of the unit housing 101, there is a possibility that the foreign matter MF enters the interior of the unit housing 101 together with the cooling air Fa. In contrast, according to the present embodiment, the entry of the foreign matter MF from the unit inlet 112 is restricted by the labyrinth structure 700. Therefore, it is possible to suppress the occurrence of abnormalities in the EPU 50 due to the foreign matter MF entering the interior of the unit housing 101. For example, it is possible to suppress the occurrence of short circuit abnormalities in the drive substrate 510 due to the foreign matter MF adhering to the drive substrate 510.

[0132] Thus, in the EPU 50, cooling of the interior by the cooling air Fa can be achieved, and the occurrence of abnormality due to entry of foreign matter MF into the interior can be suppressed.

[0133] According to the present embodiment, the unit inlet 112 and the unit outlet 114 are arranged so that the cooling air Fa flowing into the unit inlet 112 passes through the motor space 74, then passes through the inverter space 94 and flows out from the unit outlet 114. In this structure, the motor 61 is cooled by the cooling air Fa in a state where the heat of the inverter 81 is not applied. Therefore, the cooling effect of the cooling air Fa on the motor 61 can be improved. Therefore, the occurrence of abnormality in the EPU 50 due to excessively high temperature of the motor 61 can be suppressed.

[0134] According to the present embodiment, the air supply fan 121 delivers the cooling air Fa so that the cooling air Fa flowing into the unit inlet 112 flows out from the unit outlet 114. In this structure, the cooling air Fa can be forced to flow into the inside of the unit housing 101 by the air supply fan 121. Therefore, it is possible to suppress the cooling effect of the cooling air Fa on the motor 61 or the inverter 81 from being reduced due to insufficient flow rate or flow rate of the cooling air Fa.

[0135] According to the present embodiment, the labyrinth structure 700 restricts foreign matter MF from entering the interior of the unit housing 101 through the labyrinth passage 710. In this structure, the foreign matter MF can be easily removed from the cooling air Fa by the cooling air Fa flowing in the labyrinth passage 710. Moreover, the labyrinth structure 700 can properly manage the pressure loss of the cooling air Fa when it flows in the labyrinth passage 710. Therefore, it is possible to prevent the pressure loss in the labyrinth passage 710 from becoming too large, causing the flow rate or flow rate of the cooling air Fa to be insufficient, and the cooling effect of the cooling air Fa on the EPU 50 to be insufficient. In addition, it is possible to prevent the pressure loss in the labyrinth passage 710 from becoming too small, causing the flow rate or flow rate of the cooling air Fa to become excessive, and causing abnormalities in the motor 61 or the inverter 81 due to the cooling air Fa.

[0136] According to the present embodiment, the labyrinth inlet 711 is oriented toward the leeward side of the propeller wind. In this structure, it is difficult for the propeller wind to directly flow into the labyrinth inlet 711. Therefore, it is difficult for foreign matter MF to enter the labyrinth inlet 711 together with the propeller wind. Therefore, the orientation of the labyrinth inlet 711 can suppress the entry of foreign matter MF into the labyrinth passage 710.

[0137] In the present embodiment, the labyrinth structure 700 is installed in a tiltrotor aircraft. In this structure, as the pitch angle of the propeller 20 changes, the direction of the labyrinth inlet 711 changes. By changing the direction of the labyrinth inlet 711, foreign matter MF located inside the labyrinth passage 710 is easily discharged from the labyrinth inlet 711. For example, when the pitch angle of the propeller 20 changes so that the labyrinth inlet 711 faces downward, foreign matter MF located inside the labyrinth passage 710 is discharged from the labyrinth inlet 711 while falling due to its own weight.

[0138] According to the present embodiment, inside the inverter housing 90, the capacitor units 527, 528, 580 and the arm switch unit 530 are arranged so that the arm switch unit 530 is cooled after the cooling air Fa cools the capacitor units 527, 528, 580. In this structure, the capacitor units 527, 528, 580 are cooled by the cooling air Fa in a state where no heat is applied to the arm switch unit 530. Therefore, the cooling effect of the cooling air Fa on the capacitor units 527, 528, 580 can be improved. In this way, the heat dissipation of the arm switch unit 530, which generates a relatively large amount of heat, is not greatly hindered by the cooling air Fa, and the heat dissipation of the capacitor units 527, 528, 580 can be fully performed.

[0139] In the present embodiment, the capacitor units 527, 528, 580 are provided between the unit connection hole 115 and the arm switch unit 530 in the radial direction RD. In this structure, in the flow of the cooling air Fa in the inverter space 94, the capacitor units 527, 528, 580 are located at a position further upstream than the arm switch unit 530. Therefore, a structure can be achieved in which the cooling air Fa reaches the arm switch unit 530 after cooling the capacitor units 527, 528, 580.

[0140] According to the present embodiment, the capacitor parts 527, 528, 580 are mounted on the drive substrate 510 at the first drive surface 510a. In this structure, the cooling wind Fa flowing along the first drive surface 510a easily hits the capacitor parts 527, 528, 580. Therefore, a structure in which the capacitor parts 527, 528, 580 are reliably cooled by the cooling wind Fa can be realized. Moreover, the arm switch part 530 is arranged between the capacitor parts 527, 528, 580 and the inverter inner wall surface 91a. Therefore, the cooling wind Fa passing through the capacitor parts 527, 528, 580 easily hits the arm switch part 530. Therefore, a structure in which the arm switch part 530 is reliably cooled by the cooling wind Fa can be realized.

[0141] According to the present embodiment, the arm switch unit 530 is configured so that the cooling air Fa flows through the drive gap 94c after cooling the arm switch unit 530. In this structure, even if the pressure loss in the drive gap 94c increases and the flow rate or flow rate of the cooling air Fa in the drive gap 94c decreases, it is difficult to generate insufficient flow rate or flow rate of the cooling air Fa for cooling the arm switch unit 530. Therefore, it is possible to suppress the cooling effect of the cooling air Fa on the arm switch unit 530 from being reduced due to the drive gap 94c.

[0142] In this embodiment, the arm switch unit 530 is provided between the unit connection hole 115 and the drive gap 94c in the axial direction AD. In this structure, the arm switch unit 530 is located at a position further upstream than the drive gap 94c in the flow of the cooling air Fa in the inverter space 94. Therefore, a structure in which the cooling air Fa passes through the drive gap 94c after cooling the arm switch unit 530 can be realized.

[0143] In addition, in the inverter space 94, the first drive space 94a and the second drive space 94b are connected by the drive gap 94c. Therefore, after the cooling wind Fa cools the capacitor parts 527, 528, 580 and the arm switch part 530 in the first drive space 94a, it passes through the drive gap 94c and flows into the second drive space 94b. Therefore, the cooling wind Fa cools the arm switch part 530 before passing through the drive gap 94c. That is, it is difficult to generate the cooling wind Fa that passes through the drive gap 94c without cooling the arm switch part 530. Therefore, the arm switch part 530 can be cooled by as much cooling wind Fa as possible.

[0144] 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 of the unit housing 101 via the inverter outer peripheral wall 91. By cooling the outside of the motor unit 100 using propeller wind, the arm switch unit 530 can be cooled.

[0145] In this embodiment, a plurality of arm switch parts 530 are arranged along the inverter inner wall surface 91a and in the circumferential direction CD. In this structure, the effect of external cooling can be applied individually to each of the plurality of arm switch parts 530. Therefore, even if the number of arm switch parts 530 is large, the heat of the arm switch parts 530 can be suppressed from being retained inside the inverter housing 90.

[0146] Moreover, since the arm switch unit 530 is provided on the inner wall surface 91a of the inverter, the column of the arm switch unit 530 is located as close as possible to the inner wall surface 91a of the inverter. The column of the arm switch unit 530 is formed by a plurality of arm switch units 530, extending along the inner wall surface 91a of the inverter and in the circumferential direction CD. In the column of the arm switch unit 530, the closer to the radial outer side, the longer the circumference in the circumferential direction CD. Therefore, in a structure in which the arm switch unit 530 is located as close as possible to the inner wall surface 91a of the inverter, the number of arm switch units 530 forming the column can be increased as much as possible. That is, the multi-pole number (Japanese: multi-pole number) of the arm switch unit 530 can be increased. The multi-pole number is the number of arm switch units 530 connected in parallel to each other in one phase.

[0147] In the inverter device 80, the heat generated by the arm switch unit 530 is larger than the heat generated by the smoothing capacitor unit 580 and the heat generated by the filter component 524. Therefore, the greater the number of arm switch units 530, the more advantageous it is to cool the arm switch units 530. This is because the greater the number of arm switch units 530, the easier it is to reduce the heat generated in one arm switch unit 530.

[0148] 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 driven by the EPU 50, the cooling of the inside of the EPU 50 by the cooling air Fa can be achieved, and the occurrence of abnormalities caused by the entry of foreign matter MF into the inside of the EPU 50 can be suppressed. Therefore, by suppressing the occurrence of abnormalities caused by heat or foreign matter MF in the EPU 50, the reduction in the safety of the eVTOL 10 can be suppressed. In the aircraft of the eVTOL 10, the requirements for suppressing possible malfunctions are strict, and the requirements for the output density [kg / kw] of the EPU 50 are also strict. Therefore, by cooling the inside of the EPU 50 with the cooling air Fa and limiting the entry of foreign matter MF, foreign matter countermeasures and weight reduction can be achieved at the same time.

[0149] <Second embodiment> In the first embodiment, the labyrinth inlet 711 faces the leeward side of the propeller wind. In contrast, in the second embodiment, the labyrinth inlet 711 faces the upwind side of the propeller wind. The structure, function, and effect not specifically 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.

[0150] like Figure 7 As shown, the labyrinth structure 700 has a plurality of labyrinth inlets 711. A plurality of labyrinth inlets 711 are provided on the outer surface of the labyrinth housing 701. The plurality of labyrinth inlets 711 include a labyrinth inlet 711 facing the leeward side of the propeller wind and a labyrinth inlet 711 facing the upwind side of the propeller wind. The labyrinth inlet 711 facing the upwind side faces the propeller 20 side in the axial direction AD. The labyrinth inlet 711 facing the upwind side and the labyrinth inlet 711 facing the leeward side face opposite sides to each other in the axial direction AD.

[0151] The plurality of labyrinth inlets 711 include a labyrinth inlet 711 that is open in the circumferential direction CD. Figure 7 In the figure, the labyrinth inlet 711 opened in the circumferential direction CD is omitted. The labyrinth inlet 711 opened in the circumferential direction CD, the labyrinth inlet 711 facing the upwind side, and the labyrinth inlet 711 facing the leeward side face different directions from each other. For example, the plurality of labyrinth inlets 711 are arranged in at least one direction of the axial direction AD and the circumferential direction CD.

[0152] In the present embodiment, the labyrinth passage 710 has a plurality of labyrinth inlets 711. In this structure, even if foreign matter MF enters the labyrinth passage 710 from any one of the plurality of labyrinth inlets 711, the other labyrinth inlets 711 can discharge the foreign matter MF to the outside. For example, even if foreign matter MF enters the labyrinth passage 710 from the labyrinth inlet 711 facing the upwind side of the propeller wind, the foreign matter MF can be easily discharged to the outside from the labyrinth inlet 711 facing the leeward side. Therefore, a structure in which foreign matter MF can be easily discharged from the labyrinth passage 710 to the outside of the labyrinth housing 701 can be realized.

[0153] <Third Embodiment> In the first embodiment, the labyrinth structure 700 is used as the foreign matter restricting portion. In contrast, in the third embodiment, the foreign matter separating portion is used as the foreign matter restricting portion. The structure, function, and effect not specifically 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.

[0154] like Figure 8 As shown, the EPU 50 includes a centrifugal separator 750 and a separation connection pipe 755. The centrifugal separator 750 restricts foreign matter MF from entering the motor unit 100 from the motor inlet 112A. The centrifugal separator 750 is equivalent to a foreign matter restricting portion. The centrifugal separator 750 is installed on the air supply device 120. The centrifugal separator 750 is provided outside the housing inlet 127. The centrifugal separator 750 restricts foreign matter MF from entering the unit space 102 by restricting the foreign matter MF from entering the housing inlet 127.

[0155] The centrifugal separator 750 can separate the cooling air Fa and the foreign matter MF by centrifugal force. In the centrifugal separator 750, the foreign matter MF is removed from the cooling air Fa by centrifugal force. The centrifugal separator 750 is equivalent to a foreign matter separation unit. The separation connecting pipe 755 connects the centrifugal separator 750 to the air supply device 120. The separation connecting pipe 755 is formed of, for example, a flexible pipe member. The separation connecting pipe 755 supplies the cooling air Fa from which the foreign matter MF has been removed in the centrifugal separator 750 to the air supply device 120.

[0156] like Fig. 9As shown, the centrifugal separator 750 has a separation passage 760. The separation passage 760 has a separation inlet 761, a separation outlet 762, a foreign matter outlet 763, and a separation space 765. The separation inlet 761 is an inlet for allowing the cooling air Fa to flow into the separation passage 760. The separation outlet 762 is an outlet for allowing the cooling air Fa to flow out of the separation passage 760. The foreign matter outlet 763 is an outlet for discharging the foreign matter MF separated from the cooling air Fa to the outside of the centrifugal separator 750. The separation space 765 is connected to the separation inlet 761, the separation outlet 762, and the foreign matter outlet 763. The separation space 765 is a space that can separate the cooling air Fa and the foreign matter MF by centrifugal force.

[0157] After the cooling air Fa containing the foreign matter MF flows into the separation passage 760 from the separation inlet 761, it is separated into the cooling air Fa and the foreign matter MF in the separation space 765. Then, the cooling air Fa flows into the air supply device 120 from the separation outlet 762 via the separation connecting pipe 755. On the other hand, the foreign matter MF is discharged from the foreign matter discharge port 763. The separation connecting pipe 755 connects the separation outlet 762 to the housing inlet 127 in a ventilated manner.

[0158] The centrifugal separator 750 includes a separation housing 751. The separation housing 751 is formed of a resin material or the like. The separation housing 751 forms a separation passage 760. A separation inlet 761, a separation outlet 762, and a foreign matter outlet 763 are provided on the outer surface of the separation housing 751. The separation housing 751 is fixed to the unit housing 101 by a fixing member such as a bolt. The separation housing 751 is, for example, provided on the radially outer side of the unit housing 101 and fixed to the unit outer peripheral wall surface 101c.

[0159] In the centrifugal separator 750, the separation inlet 761, the separation outlet 762 and the foreign matter outlet 763 are opened in different directions from each other. The foreign matter outlet 763 is opened toward the leeward side of the propeller wind. Therefore, it is difficult to produce a situation where the foreign matter MF to be discharged from the foreign matter outlet 763 is pushed back to the separation passage 760 by the propeller wind. The separation inlet 761 is opened, for example, in the circumferential direction CD. The separation outlet 762 is opened, for example, in the axial direction AD.

[0160] According to the present embodiment, the centrifugal separator 750 separates the cooling air Fa from the foreign matter MF by utilizing centrifugal force, thereby restricting the foreign matter MF from entering the interior of the unit housing 101. In this structure, the cooling air Fa containing the foreign matter MF is separated into the cooling air Fa and the foreign matter MF by flowing inside the centrifugal separator 750. Thus, by utilizing the centrifugal force in the centrifugal separator 750, it is easier to remove the foreign matter MF from the cooling air Fa than, for example, the labyrinth structure 700 of the first embodiment described above.

[0161] In the centrifugal separator 750, it is sufficient to generate centrifugal force in the separation space 765, and it is not necessary to make the separation passage 760 elongated. Therefore, it is possible to prevent the pressure loss in the separation passage 760 from becoming too large, thereby preventing the flow rate or flow rate of the cooling air Fa from being insufficient, and the cooling effect of the cooling air Fa on the EPU 50 from being insufficient. Therefore, for example, compared with the labyrinth structure 700 of the first embodiment described above, a low pressure loss can be achieved.

[0162] According to the present embodiment, the foreign matter discharge port 763 faces the leeward side of the propeller wind. In this structure, it is difficult for the propeller wind to directly flow into the foreign matter discharge port 763. Therefore, it is possible to prevent foreign matter MF from entering the foreign matter discharge port 763 together with the propeller wind, and to prevent foreign matter MF that should be discharged from the foreign matter discharge port 763 from being pushed back into the separation space 765 by the propeller wind. Therefore, in the centrifugal separator 750, a structure that reliably discharges foreign matter MF from the foreign matter discharge port 763 can be realized. In addition, since the foreign matter MF is blown away by the propeller wind and is difficult to reach the EPU 50, it is possible to prevent the foreign matter MF from adhering to the outer surface of the EPU 50.

[0163] <Fourth embodiment> In the third embodiment, the foreign matter discharge port 763 faces the leeward side of the propeller wind. In contrast, in the fourth embodiment, the foreign matter discharge port 763 faces the direction intersecting the propeller wind. The structure, function, and effect not specifically described in the fourth embodiment are the same as those in the third embodiment. In the fourth embodiment, the description will be centered on the points different from the third embodiment.

[0164] like Fig.10 As shown, the centrifugal separator 750 is arranged so that the foreign matter discharge port 763 is open in the radial direction RD. The foreign matter discharge port 763 is open in a direction orthogonal to the propeller wind. For example, the foreign matter discharge port 763 faces radially outward. In the centrifugal separator 750, the separation inlet 761 is open in the circumferential direction CD. In addition, the separation outlet 762 faces radially inward. In the centrifugal separator 750, the separation housing 751 is arranged side by side with the unit housing 101 in the axial direction AD. For example, the separation housing 751 is arranged on the upwind side of the propeller wind relative to the unit housing 101, and is fixed to the unit upstream wall 101a.

[0165] According to the present embodiment, the foreign matter discharge port 763 is open in a direction orthogonal to the propeller wind. In this structure, the foreign matter discharge direction is orthogonal to the flight direction. The foreign matter discharge direction is the direction in which the foreign matter MF is discharged from the foreign matter discharge port 763, for example, the radial direction RD. The flight direction is the direction in which the eVTOL 10 moves forward, and is easily consistent with the direction in which the propeller wind flows. In this way, when the foreign matter discharge direction is orthogonal to the flight direction, the foreign matter MF will be blown away by the flying wind and will be difficult to reach the EPU 50. Thereby, it is possible to improve the suppression of foreign matter adhering to the EPU 50. The direction in which the propeller wind flows is easily consistent with the direction in which the flying wind flows generated by the flight of the eVTOL 10.

[0166] <Fifth embodiment> In the first embodiment, the labyrinth structure 700 is used as the foreign matter restricting portion, and in the second embodiment, the centrifugal separator 750 is used as the foreign matter restricting portion. In contrast, in the fifth embodiment, a filtration filter is used as the foreign matter restricting portion. The structure, function, and effect not particularly described in the fifth embodiment are the same as those in the first embodiment. In the fifth embodiment, the description will be centered on the points different from the first embodiment.

[0167] like Fig.11 As shown, the EPU 50 has a filter 770. The filter 770 restricts foreign matter MF from entering the motor unit 100 from the motor inlet 112A. The filter 770 is equivalent to a foreign matter restricting portion. The filter 770 is mounted on the air supply device 120. The filter 770 restricts foreign matter MF from entering the housing inlet 127 to restrict foreign matter MF from entering the unit space 102.

[0168] The filter sheet 770 removes foreign matter MF from the cooling air Fa by filtering the cooling air Fa. The filter sheet 770 is a sheet-shaped filter member. As the filter sheet 770, there is a filter member including a non-woven fabric. The filter sheet 770 is equivalent to a filtering filter. The filter sheet 770 covers the housing inlet 127 from the outside. The filter sheet 770 is fixed to the housing outer surface 125a by an adhesive or the like.

[0169] The filter sheet 770 is a waterproof and breathable sheet. The filter sheet 770 is waterproof and breathable. The filter sheet 770 allows moisture or water vapor to pass through together with the cooling air Fa, but restricts the passage of water as a foreign matter MF. The filter sheet 770 has a pair of surfaces. One surface is a pasting surface pasted to the outer surface 125a of the housing. The other surface is an exposed surface exposed to the side opposite to the outer surface 125a of the housing. In the filter sheet 770, a plurality of layers are stacked.

[0170] like Fig.12As shown, the filter sheet 770 includes a filter layer 771, an inner protective layer 772, an outer protective layer 773, a soft layer 774, and an outer contour layer 775. These layers 771 to 775 are stacked on each other to form the filter sheet 770. The layers 771 to 775 are formed into a sheet shape from a resin material or the like.

[0171] The filter layer 771 has waterproofness and moisture permeability. The filter layer 771 allows moisture or water vapor to pass through together with the cooling air Fa, but restricts the passage of water as a foreign matter MF. The filter layer 771 is a porous membrane. The soft layer 774 has flexibility and forms a bonding surface of the filter sheet 770. The outer contour layer 775 has wear resistance and forms an exposed surface of the filter sheet 770. The inner protective layer 772 is provided between the filter layer 771 and the soft layer 774, and protects the filter layer 771 from the inside. The outer protective layer 773 is provided between the filter layer 771 and the outer contour layer 775, and protects the filter layer 771 from the outside.

[0172] According to the present embodiment, the filter 770 restricts foreign matter MF from entering the interior of the unit housing 101 by filtering the cooling air Fa. In this structure, the foreign matter MF is removed from the cooling air Fa by passing the cooling air Fa through the filter 770. The filter 770 does not need to form a labyrinth passage 710 as in the first embodiment or a separation passage 760 as in the third embodiment. Therefore, by using the filter 770 as a foreign matter restriction portion, it is possible to achieve lightweight and miniaturization of the foreign matter restriction portion. In addition, the filter 770 makes it easy to remove foreign matter MF from the cooling air Fa by filtering the cooling air Fa. Therefore, by using the filter 770 as a foreign matter restriction portion, it is possible to improve the reliability of foreign matter removal.

[0173] In addition, in the present embodiment, the filter sheet 770 and other filtration filters may not be sheet-shaped. For example, the filtration filter may be columnar or rectangular as long as it has a filtering function. In addition, the filtration filter may also enter the unit inlet 112. For example, the filtration filter may also be in a state of being buried in the unit inlet 111 in a manner that closes the unit inlet 112.

[0174] <Sixth embodiment> In the first embodiment, the unit connection hole 115 is provided as the plate connection hole 115A in the partition plate 108. In contrast, in the sixth embodiment, the unit connection hole 115 is provided in the motor shaft 340. The structure, function, and effect not particularly described in the sixth embodiment are the same as those in the first embodiment. In the sixth embodiment, the description will be centered on the points different from the first embodiment.

[0175] like Fig.13As shown, the shaft body 341 has a shaft space 341a. The shaft space 341a is the internal space of the shaft body 341. The shaft space 341a is communicated with the inverter space 94. The shaft body 341 is in a state of penetrating the partition plate 108 in the axial direction AD. The shaft space 341a is located radially inside the motor space 74. The shaft body 341 is in a state of separating the shaft space 341a from the motor space 74.

[0176] As the unit connection hole 115, the motor unit 100 has a shaft connection hole 115B. The shaft connection hole 115B is provided in the shaft body 341. The shaft connection hole 115B penetrates the shaft body 341 in the radial direction RD. The shaft connection hole 115B communicates with the shaft space 341a. The shaft connection hole 115B connects the motor space 74 and the inverter space 94 via the shaft space 341a in a ventilated manner. The shaft connection hole 115B is provided between the shaft flange 342 and the partition plate 108 in the axial direction AD. The shaft connection hole 115B is located at a position communicating with the second outer gap 452. A plurality of shaft connection holes 115B are arranged in the circumferential direction CD.

[0177] The cooling air Fa flows from the motor space 74 through the shaft connection hole 115B and into the shaft space 341a. Then, the cooling air Fa flows from the shaft space 341a along the motor axis Cm into the inverter space 94. Therefore, the central part of the inverter space 94 in the radial direction RD is easily cooled by the cooling air Fa.

[0178] The motor unit 100 has a motor fin 72 and an inverter fin 92. The motor fin 72 and the inverter fin 92 are provided on the unit outer peripheral wall surface 101c. The motor fin 72 and the inverter fin 92 are heat dissipation fins that release the heat of the motor unit 100 to the outside. The motor fin 72 and the inverter fin 92 cool the motor unit 100 by dissipating heat. The motor fin 72 and the inverter fin 92 can improve the cooling effect of the propeller wind on the motor unit 100. A plurality of the motor fins 72 and the inverter fin 92 are arranged in the circumferential direction CD.

[0179] The motor fin 72 is included in the motor housing 70. The motor fin 72 is provided on the motor outer peripheral wall surface 70c. The motor fin 72 extends radially outward from the motor outer peripheral wall 71. The motor fin 72 is provided at a position parallel to the stator 200 in the radial direction RD. The heat of the stator 200 is easily transferred to the motor fin 72 via the motor outer peripheral wall 71.

[0180] The inverter blade 92 is provided on the inverter housing 90. The inverter fin 92 is provided on the inverter outer peripheral wall surface 90c. The inverter fin 92 extends radially outward from the inverter outer peripheral wall 91. The inverter fin 92 is provided at a position parallel to the arm switch unit 530 in the radial direction RD. The heat of the arm switch unit 530 is easily transferred to the inverter fin 92 via the inverter outer peripheral wall 91.

[0181] In addition, the shaft connection hole 115B can also connect the motor space 74 with the inverter space 94 in a ventilated manner without passing through the shaft space 341a. For example, in a structure in which the shaft body 341 is a solid column member, it is preferred that the shaft connection hole 115B extends in at least one direction of the axial direction AD and the radial direction RD to connect the motor space 74 with the inverter space 94.

[0182] The EPU 50 may also have a fin cover. The fin cover covers at least one of the motor fins 72 and the inverter fins 92 from the radial outside. The fin cover is a cover member that covers the heat dissipation fins from the radial outside. In the EPU 50, a cover flow path is provided between the unit peripheral wall 105 and the fin cover. In the cover flow path, the propeller wind flows along the unit peripheral wall surface 101c and in the axial direction AD. At least one of the motor fins 72 and the inverter fins 92 is accommodated in the cover flow path. In the cover flow path, heat is released from the motor fins 72 or the inverter fins 92 to the propeller wind.

[0183] The EPU 50 may also include a fin fan. The fin fan is a fan for cooling at least one of the motor fin 72 and the inverter fin 92. The fin fan blows air in the same direction as the propeller wind. The fin fan is provided on at least one of the upstream side and the downstream side of the motor fin 72 and the inverter fin 92. The wind generated by the air blown by the fin fan promotes heat dissipation from at least one of the motor fin 72 and the inverter fin 92.

[0184] <Seventh embodiment> In the first embodiment, the unit outlet 114 is provided as the inverter outlet 114B in the inverter housing 90. In contrast, in the seventh embodiment, the unit outlet 114 is provided in the motor housing 70. 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.

[0185] like Fig.14As shown, the motor unit 100 has a motor outflow hole 113A and a motor outflow hole 114A as a unit outflow hole 113 and a unit outflow hole 114. The motor outflow hole 114A is an outflow hole for allowing the cooling air Fa to flow out from the motor space 74 to the outside of the motor unit 100. The motor outflow hole 114A is provided on the outer surface of the motor housing 70. For example, the motor outflow hole 114A is provided on the outer peripheral wall surface 70c of the motor. A plurality of motor outflow holes 114A are arranged in the circumferential direction CD. The motor outflow hole 114A is equivalent to the housing outflow hole.

[0186] The motor outflow hole 113A is provided in the motor housing 70. The motor outflow hole 113A communicates with the motor space 74. For example, the motor outflow hole 113A penetrates the motor outer peripheral wall 71 in the radial direction RD. The motor outflow hole 113A is provided between the partition plate 108 and the stator 200 in the axial direction AD. The motor outflow hole 113A is located at a position communicating with the motor gap 450. For example, the motor outflow hole 113A communicates with the second outer gap 452. A plurality of motor outflow holes 113A are arranged in the circumferential direction CD.

[0187] The outlet filter 720 is attached to the motor outer peripheral wall surface 70c in a manner covering the motor outlet 114A. The outlet filter 720 restricts foreign matter MF from entering the motor space 74 from the motor outlet 114A. In this embodiment, similarly to the fifth embodiment, the filter sheet 770 restricts the entry of foreign matter MF from the motor inlet 112A into the motor space 74.

[0188] In this embodiment, similarly to the sixth embodiment, a shaft connection hole 115B is provided on the motor shaft 340. Unlike the sixth embodiment, the shaft connection hole 115B is provided at a position communicating with the first outer gap 451. The shaft connection hole 115B is located between the shaft flange 342 and the upstream plate 106 in the axial direction AD.

[0189] After the cooling air Fa flows into the motor space 74 from the motor inlet 112A, it branches into at least the motor air Fa 1 and the inverter air Fa 2. That is, the cooling air Fa includes the motor air Fa 1 and the inverter air Fa 2.

[0190] The motor wind Fa1 cools the motor 61 in the motor space 74. For example, the motor wind Fa1 cools the stator 200 by flowing into the motor gap 450 in the motor space 74 and flowing in the second outer gap 452. After cooling the stator 200, the motor wind Fa1 does not flow into the inverter space 94 but flows out from the motor outlet 114A. Therefore, it is possible to avoid the heat applied to the motor wind Fa1 from the stator 200 from flowing into the inverter space 94 together with the motor wind Fa1. In the motor device 60, the motor coil of the stator 200 is most likely to generate heat. Therefore, by applying heat from the motor coil to the motor wind Fa1, the temperature of the motor wind Fa1 is likely to rise, and the cooling performance of the motor wind Fa1 is likely to decrease.

[0191] The inverter wind Fa2 cools the inverter 81 in the inverter space 94 instead of the stator 200 in the motor space 74. For example, the inverter wind Fa2 passes through the shaft connection hole 115B and the shaft space 341a in the motor space 74 and flows into the inverter space 94. The inverter wind Fa2 can flow into the inverter space 94 without passing through the motor gap 450. As described in the first embodiment, the inverter wind Fa2 cools the arm switch unit 530 and the like in the inverter space 94.

[0192] In the motor unit 100, the flow rate of the motor wind Fa1 tends to become larger than the flow rate of the inverter wind Fa2. The cross-sectional area of ​​the motor gap 450 and the cross-sectional area of ​​the shaft connection hole 115B are set so that the flow rate of the motor wind Fa1 is larger than the flow rate of the inverter wind Fa2. For example, the cross-sectional area of ​​the narrowest part in the motor gap 450 is larger than the cross-sectional area of ​​the shaft connection hole 115B. In the case where the flow rate of the motor wind Fa1 is larger than the flow rate of the inverter wind Fa2, the cooling effect of the motor wind Fa1 on the stator 200 can be increased as much as possible. In this way, the motor 61 is cooled with higher priority than the inverter 81 cooling wind Fa, which is effective in cooling the motor unit 100 in which the heat generated by the motor coil is larger than the heat generated by the arm switch part 530.

[0193] <Eighth Embodiment> In the first embodiment, the motor inlet 112A is provided at a position away from the stator 200 in the radial direction. In contrast, in the eighth embodiment, the motor inlet 112A is provided at a position parallel to the stator 200 in the axial direction AD. The structure, function, and effect not particularly described in the eighth embodiment are the same as those in the first embodiment. In the eighth embodiment, the description will be centered on the points different from the first embodiment.

[0194] like Fig.15As shown, the EPU 50 does not have an air supply device 120. In this embodiment, the propeller wind flows into the motor space 74 from the motor inlet 112A as cooling wind Fa. The motor inlet 112A is on the upwind side of the propeller wind in the motor upstream wall 70a. The EPU 50 has a filter 770 in the same manner as the fifth embodiment described above. The filter 770 covers the motor inlet 112A from the outside. The filter 770 is fixed to the motor upstream wall 70a by an adhesive or the like. The filter 770 restricts foreign matter MF from entering the motor inlet 112A by being directly set relative to the motor inlet 112A. A plurality of the motor inlet 112A and the filter 770 are arranged in the circumferential direction CD.

[0195] The motor inlet 112A is different from the first embodiment in that it is disposed at an outer position closer to the motor outer peripheral wall 71 than the shaft body 341 in the radial direction RD. The motor inlet 112A is located at a position opposite to the stator 200 across the first rotor 300a. The motor inlet 112A and the stator 200 are arranged in the axial direction AD across the first rotor 300a. The motor inlet 112A is disposed at a position communicating with the first outer gap 451. For example, the motor inlet 112A is located at a position arranged in the axial direction AD with the gap between the first rotor 300a and the motor outer peripheral wall 71.

[0196] The plate connection hole 115A is different from the first embodiment described above, and is provided at a position closer to the outside of the unit outer peripheral wall 105 than the shaft body 341 in the radial direction RD. The plate connection hole 115A is located at a position opposite to the stator 200 via the second rotor 300b. The plate connection hole 115A and the stator 200 are arranged in the axial direction AD via the second rotor 300b. The plate connection hole 115A is provided at a position communicating with the second outer gap 452. For example, the plate connection hole 115A is located at a position arranged in the axial direction AD with the gap between the second rotor 300b and the motor outer peripheral wall 71.

[0197] The plate connection hole 115A is located radially outward from the filter component 524. For example, the plate connection hole 115A is located radially outward from the smoothing capacitor unit 580. The plate connection hole 115A is located in a position aligned with the arm switch unit 530 in the axial direction AD. The plate connection hole 115A is aligned with the motor inlet 112A across the stator 200 in the axial direction AD.

[0198] The cooling air Fa flowing into the motor inlet 112A passes through the motor inlet hole 111A in the axial direction AD and directly advances in the axial direction AD to reach the stator 200. Therefore, the cooling air Fa can cool the stator 200 through the inner gap 453 in the motor device 60 without applying heat to other parts. After flowing out from the inner gap 453, the cooling air Fa passes through the plate connection hole 115A in the axial direction AD and directly advances in the axial direction AD to reach the arm switch part 530. Therefore, the cooling air Fa can cool the arm switch part 530 in the inverter device 80 without applying heat to other parts.

[0199] <Ninth embodiment> In the first embodiment, the labyrinth structure 700 as the foreign matter restricting portion is provided on the upstream side of the air supply fan 121. In contrast, in the ninth embodiment, the foreign matter restricting portion is provided on the downstream side of the air supply fan 121. 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.

[0200] like Fig.16 As shown, the EPU 50 has a filter 770 as a foreign matter restricting portion similarly to the fifth embodiment. The filter 770 is provided between the blower fan 121 and the motor inlet 112A in the axial direction AD. The filter 770 covers the motor inlet 112A from the outside similarly to the eighth embodiment.

[0201] The air supply housing 125 of this embodiment is formed into a cylindrical shape and extends in the axial direction AD. In the air supply housing 125, the housing inlet 127 and the housing outlet 128 are arranged in the axial direction AD. The housing inlet 127 faces the upstream side of the propeller wind. The housing outlet 128 faces the downstream side of the propeller wind. The motor inlet 112A is arranged with the housing inlet 127 and the housing outlet 128 in the axial direction AD.

[0202] In the air supply fan 121, the air supply head 123 is longer than the air supply blade 122 in the radial direction RD. The air supply blade 122 is arranged at a position aligned with the motor inlet 112A in the axial direction AD. The air supply head 123 is arranged at a position radially away from the motor inlet 112A. The cooling air Fa flows along the axial direction AD in a manner of flowing into the motor inlet 112A as the air supply fan 121 rotates. When the propeller wind reaches the air supply fan 121, the air supply fan 121 can make the propeller wind flow into the motor inlet 112A as the cooling air Fa.

[0203] <Tenth embodiment> In the first embodiment, the air supply fan 121 is configured to flow the cooling air Fa as a cooling air fan. In contrast, in the tenth embodiment, the rotors 300a and 300b are configured to flow the cooling air Fa as cooling air fans. The structure, function, and effect not specifically described in the tenth embodiment are the same as those in the first embodiment. The tenth embodiment will be described mainly around the points that are different from the first embodiment.

[0204] like Fig.17 As shown, the rotors 300a and 300b have a retainer body 321 and a retainer rib 323. The retainer body 321 and the retainer rib 323 are included in the magnet retainer 320. The retainer body 321 and the retainer rib 323 are formed of a metal material or the like. The retainer body 321 extends in a plate-like shape in a direction orthogonal to the axial direction AD. The retainer body 321 extends in an annular shape in the circumferential direction CD. The retainer body 321 supports the magnet 310. The magnet 310 is in a state of entering the interior of the retainer body 321 from the stator 200 side.

[0205] The retainer rib 323 protrudes from the retainer body 321 to the side opposite to the stator 200. The retainer rib 323 extends in a slender shape along the retainer body 321 and in the radial direction RD. A plurality of retainer ribs 323 are arranged in the circumferential direction CD. At least a portion of the retainer rib 323 is provided at a position parallel to the magnet 310 in the axial direction AD.

[0206] The rotors 300a and 300b can flow the cooling air Fa. The rotors 300a and 300b are equivalent to cooling air fans. When the rotors 300a and 300b rotate, the cooling air Fa flows by the movement of the retaining ribs 323 in the circumferential direction CD. In the rotors 300a and 300b, the retaining ribs 323 function as blades of the cooling air fan. The rotors 300a and 300b as cooling air fans are accommodated in the motor housing 70. That is, the cooling air fan is accommodated in the unit housing 101.

[0207] When the rotors 300a and 300b rotate, the cooling air Fa flows from the motor inlet 112A into the motor space 74, passes through the inverter space 94, and flows out from the inverter outlet 114B, as in the first embodiment. The holder rib 323 is formed in a shape that allows the cooling air Fa to easily flow along with the rotation of the rotors 300a and 300b. For example, the holder rib 323 is curved in such a way that the central portion of the holder rib 323 bulges in one direction in the circumferential direction CD. In this way, the flow velocity and flow rate of the cooling air Fa are easily increased by the curvature of the holder rib 323.

[0208] In the present embodiment, only one of the rotors 300a and 300b may have the holder rib 323. In the electric motor 61, if at least one of the rotors 300a and 300b has the holder rib 323, the cooling air Fa flows as the rotors 300a and 300b rotate.

[0209] <Eleventh Embodiment> In the first embodiment, an outlet filter 720 is provided relative to the unit outlet 114. In contrast, in the eleventh embodiment, a valve core is provided relative to the unit outlet 114. The structure, function, and effect not particularly described in the eleventh embodiment are the same as those in the first embodiment. In the eleventh embodiment, the description will be centered on the points different from the first embodiment.

[0210] like Fig.18 As shown, the EPU 50 has a check valve 780. The check valve 780 is provided to cover the unit outlet 114 from the outside. The check valve 780 is a valve core that opens and closes the unit outlet 114. The check valve 780 overlaps with the unit downstream wall surface 101b. A portion of the check valve 780 is fixed to the unit downstream wall surface 101b by an adhesive or the like. The check valve 780 is formed of rubber or the like and can be elastically deformed.

[0211] The check valve 780 can be transferred to a closed valve state and an open valve state by elastic deformation. The check valve 780 closes the unit flow outlet 114 when it is in the closed valve state. When the check valve 780 is in the closed valve state, the check valve 780 restricts foreign matter MF from entering the unit space 102 from the unit flow outlet 114. When the check valve 780 is in the open valve state, the unit flow outlet 114 is opened. When the check valve 780 is in the open valve state, the cooling air Fa flows out from the unit flow outlet 114. The check valve 780 is elastically deformed by the wind pressure of the cooling air Fa and transfers from the closed valve state to the open valve state.

[0212] <Twelfth embodiment> In the first embodiment, the smoothing capacitor unit 580 is provided on the drive substrate 510, and the microcomputer 165 is provided on the control substrate 550. In contrast, in the twelfth embodiment, both the smoothing capacitor unit 580 and the microcomputer 165 are provided on one circuit substrate. 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.

[0213] like Fig.19As shown, in the motor unit 100, both the smoothing capacitor unit 580 and the microcomputer 165 are provided on the drive substrate 510. In the drive substrate 510, the smoothing capacitor unit 580 is mounted on the first drive surface 510a. The microcomputer 165 is mounted on the second drive surface 510b. As in the first embodiment described above, a filter component 524 is mounted on the first drive surface 510a in addition to the smoothing capacitor unit 580. The motor unit 100 has the drive substrate 510, but does not have the control substrate 550.

[0214] In addition, the microcomputer 165 may be provided on the same surface of the drive substrate 510 as the smoothing capacitor unit 580. For example, both the microcomputer 165 and the smoothing capacitor unit 580 may be mounted on the first drive surface 510a. In addition, the smoothing capacitor unit 580 and the microcomputer 165 may be provided on the control substrate 550 as one circuit substrate.

[0215] <Thirteenth embodiment> In the first embodiment, the cooling air Fa passes through the motor space 74, then passes through the inverter space 94, and flows out from the unit flow outlet 114. In contrast, in the thirteenth embodiment, the cooling air Fa passes through only one of the motor space 74 and the inverter space 94, and flows out from the unit flow outlet 114. The structure, function, and effect not particularly described in the thirteenth embodiment are the same as those in the first embodiment. In the thirteenth embodiment, the description will be centered on the points different from the first embodiment.

[0216] like Fig. 20 As shown, in the motor unit 100, the motor space 74 and the inverter space 94 become independent spaces. In the unit space 102, the motor space 74 is not connected to the inverter space 94. In the motor unit 100, there is no direct ventilation between the motor space 74 and the inverter space 94. For example, the motor unit 100 does not have a unit connection hole 115.

[0217] In the motor unit 100, similarly to the seventh embodiment, the cooling air Fa includes the motor air Fa 1 and the inverter air Fa 2. The motor air Fa 1 flows into the motor space 74 from the outside of the unit casing 101 without passing through the inverter space 94. In addition, the motor air Fa 1 flows out from the motor space 74 to the outside of the unit casing 101 without passing through the inverter space 94. The inverter air Fa 2 flows into the inverter space 94 from the outside of the unit casing 101 without passing through the motor space 74. In addition, the inverter air Fa 2 flows out from the inverter space 94 to the outside of the unit casing 101 without passing through the motor space 74.

[0218] The motor unit 100 has a motor inlet 112A and an inverter inlet 112B as the unit inlet 112. The motor inlet 112A enables the motor wind Fa1 to flow into the motor space 74. For example, the motor inlet 112A is provided on the motor upstream wall surface 70a as in the first embodiment described above. The motor inlet 112A is located at a position where the motor wind Fa1 generated by the air supply fan 121 can easily flow in.

[0219] The inverter inlet 112B is an inlet for allowing cooling air Fa to flow from the outside of the unit housing 101 into the inverter space 94. The inverter inlet 112B can allow the inverter air Fa2 to flow into the inverter space 94. The inverter inlet 112B is provided on the outer surface of the motor housing 70. For example, the inverter inlet 112B is provided on the outer peripheral wall surface 70c of the motor. The motor inlet 112A and the inverter inlet 112B are equivalent to the housing inlet.

[0220] The EPU 50 has a guide duct 790. The guide duct 790 guides the cooling wind Fa to the unit inlet 112. The cooling wind Fa is guided to the unit inlet 112 by flowing inside the guide duct 790. The guide duct 790 is provided outside the unit casing 101. For example, the guide duct 790 extends along the outer surface of the unit casing 101.

[0221] In the present embodiment, the guide duct 790 guides the inverter wind Fa2 generated by the air supply fan 121 to the inverter inlet 112B. The inverter wind Fa2 is guided to the inverter inlet 112B by flowing inside the guide duct 790. The guide duct 790 is in a state of being erected between the air supply device 120 and the inverter inlet 112B. In addition, the guide duct 790 can also guide the motor wind Fa1 to the motor inlet 112A. In the structure in which the guide duct 790 is connected to both the motor inlet 112A and the inverter inlet 112B, the motor wind Fa1 in the cooling wind Fa flowing through the guide duct 790 flows into the motor inlet 112A, and the inverter wind Fa2 flows into the inverter inlet 112B.

[0222] The motor unit 100 has a motor outlet 114A and an inverter outlet 114B as unit outlets 114. The motor outlet 114A allows the motor air Fa1 to flow out of the motor space 74 to the outside of the unit housing 101. For example, the motor outlet 114A is provided on the motor outer peripheral wall surface 70c as in the seventh embodiment.

[0223] The inverter outlet 114B can make the inverter wind Fa2 flow out from the inverter space 94 to the outside of the unit casing 101. For example, the inverter outlet 114B is provided on the inverter outer peripheral wall surface 90c. The motor outlet 114A and the inverter outlet 114B correspond to the casing outlet.

[0224] According to the present embodiment, the unit inlet 112 and the unit outlet 114 are arranged so that the cooling air Fa flowing into the unit inlet 112 passes through only one of the motor space 74 and the inverter space 94 and flows out from the unit outlet 114. In this structure, the motor space 74 and the inverter space 94 are cooled separately by the cooling air Fa. Therefore, it is possible to avoid that the heat applied to the cooling air Fa in one of the motor space 74 and the inverter space 94 flows into the other together with the cooling air Fa. Therefore, it is possible to suppress the reduction of the cooling effect of the other due to the heat generated in one of the motor space 74 and the inverter space 94.

[0225] In the present embodiment, after the motor air Fa1 flows into the motor space 74 from the motor inlet 112A, it flows out from the motor outlet 114A without passing through the inverter space 94. In this structure, only the motor space 74 and the motor space 74 in the inverter space 94 are cooled by the motor air Fa1. Therefore, it is possible to avoid applying the heat of the inverter space 94 to the motor air Fa1 and causing the heat to flow into the motor space 74 together with the motor air Fa1. Therefore, it is possible to suppress the cooling effect of the motor air Fa1 on the motor space 74 from being reduced due to the heat of the inverter space 94.

[0226] In addition, after the inverter air Fa2 flows into the inverter space 94 from the inverter inlet 112B, it flows out from the inverter outlet 114B without passing through the motor space 74. In this structure, only the motor space 74 and the inverter space 94 in the inverter space 94 are cooled by the inverter air Fa2. Therefore, it is possible to avoid applying the heat of the motor space 74 to the inverter air Fa2 and causing the heat to flow into the inverter space 94 together with the inverter air Fa2. Therefore, it is possible to suppress the cooling effect of the inverter air Fa2 on the inverter space 94 from being reduced due to the heat of the motor space 74. In particular, in a situation where the heat of the motor 61 is greater than the heat of the inverter 81, the heat of the motor 61 does not flow into the inverter space 94 together with the cooling air Fa, which is effective in improving the cooling effect of the inverter 81.

[0227] <Fourteenth embodiment> In the thirteenth embodiment, only one air supply fan 121 as a cooling air fan is provided for the motor unit 100. In contrast, in the fourteenth embodiment, a plurality of cooling air fans are provided for the motor unit 100. The structure, function, and effect not particularly described in the fourteenth embodiment are the same as those in the thirteenth embodiment. In the fourteenth embodiment, the description will be centered on the points different from the thirteenth embodiment.

[0228] like Fig.21 As shown, the EPU 50 has a motor fan 121A and an inverter fan 121B as an air supply fan 121. The motor fan 121A is a fan for causing the motor air Fa1 to flow in the motor space 74. The motor fan 121A is provided at least one of the motor inlet 112A and the motor outlet 114A. For example, the motor fan 121A is provided on the upstream side of the motor air Fa1 relative to the motor inlet 112A. The motor fan 121A causes the motor air Fa1 to flow into the motor inlet 112A by supplying air toward the motor inlet 112A. In the motor housing 70, as the motor air Fa1 flows into the motor inlet 112A, the motor air Fa1 flows out from the motor outlet 114A.

[0229] The motor inlet 112A is provided on the motor upstream wall surface 70a similarly to the first embodiment. The motor fan 121A is provided at a position aligned with the motor inlet 112A in the axial direction AD. The motor fan 121A is aligned with the motor housing 70 in the axial direction AD.

[0230] The inverter fan 121B is a fan for making the inverter wind Fa flow in the inverter space 94. The inverter fan 121B is arranged at least one of the inverter inlet 112B and the inverter outlet 114B. For example, the inverter fan 121B is arranged on the downstream side of the inverter wind Fa2 relative to the inverter outlet 114B. The inverter fan 121B makes the inverter wind Fa2 flow out from the inverter outlet 114B by sending air toward the side opposite to the inverter outlet 114B. The inverter fan 121B is in a state of sucking the inverter wind Fa2 from the inverter outlet 114B. In the motor unit 100, as the inverter wind Fa2 flows out from the inverter outlet 114B, the inverter wind Fa2 flows into the inverter inlet 112B.

[0231] The inverter outlet 114B is located on the inverter downstream wall 90b. The inverter fan 121B is arranged at a position aligned with the inverter outlet 114B in the axial direction AD. The inverter fan 121B is aligned with the inverter housing 90 in the axial direction AD. The inverter fan 121B is located on the opposite side of the motor fan 121A across the motor unit 100 in the axial direction AD.

[0232] <Fifteenth embodiment> In the first embodiment, the cooling air Fa flows into the inverter space 94 after passing through the motor space 74. In contrast, in the fifteenth embodiment, the cooling air Fa flows into the motor space 74 after passing through the inverter space 94. 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.

[0233] like Fig. 22 As shown in FIG. 1 , in the EPU 50 , the inverter device 80 is located on the upwind side of the propeller wind than the motor device 60 . The inverter device 80 is provided between the propeller 20 and the motor device 60 .

[0234] In the unit housing 101, the unit upstream wall 101a is formed by the inverter housing 90. The inverter housing 90 has an inverter upstream wall 90a. The inverter upstream wall 90a is included in the unit upstream wall 101a. The inverter upstream wall 90a is formed by the upstream plate 106. The unit downstream wall 101b is formed by the motor housing 70. The motor housing 70 has a motor downstream wall 70b. The motor downstream wall 70b is included in the unit downstream wall 101b. The motor downstream wall 70b is formed by the downstream plate 107.

[0235] The motor unit 100 has an inverter inlet 112B as the unit inlet 112, similarly to the thirteenth embodiment. The inverter inlet 112B is provided, for example, on the inverter upstream wall surface 90a. The inverter inlet 112B is located at a position where the cooling air Fa generated by the air supply fan 121 can easily flow in. The motor unit 100 has a motor outlet 114A as the unit outlet 114, similarly to the seventh embodiment. The motor outlet 114A is provided, for example, on the motor downstream wall surface 70b.

[0236] The cooling air Fa flows into the inverter inlet 112B from the outside of the motor unit 100 along with the air blown by the air blower fan 121. The cooling air Fa cools the inverter 81 in the inverter space 94, and then flows into the motor space 74 through the unit connection hole 115. The cooling air Fa cools the motor 61 in the motor space 74, and then flows out to the outside of the motor unit 100 from the motor outlet 114A.

[0237] According to the present embodiment, the unit inlet 112 and the unit outlet 114 are arranged so that the cooling air Fa flowing into the unit inlet 112 passes through the inverter space 94, passes through the motor space 74, and flows out from the unit outlet 114. In this structure, the inverter 81 is cooled by the cooling air Fa in a state where the heat of the motor 61 is not applied. Therefore, the cooling effect of the cooling air Fa on the inverter 81 can be improved. Therefore, the abnormality caused by the excessive temperature of the inverter 81 can be suppressed from occurring in the EPU 50. In particular, in a condition where the heat of the motor 61 is greater than the heat of the inverter 81, the inverter 81 is cooled by the cooling air Fa before the heat of the motor 61 is applied, which is effective in improving the cooling effect of the inverter 81.

[0238] <Sixteenth embodiment> In the first embodiment, the air supply fan 121 is provided for the unit inlet 112. In contrast, in the sixteenth embodiment, the air supply fan 121 is provided for the unit outlet 114. The structure, function, and effect not particularly described in the sixteenth embodiment are the same as those in the first embodiment. In the sixteenth 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 arranged on the downstream side of the cooling air Fa relative to the unit flow outlet 114. The air supply fan 121 is located at a position closer to the leeward side of the propeller wind than the motor unit 100. The air supply fan 121 is located on the side opposite to the propeller 20 across the motor unit 100 in the axial direction AD. The air supply fan 121 causes the cooling air Fa to flow out from the unit flow outlet 114 by sending air toward the side opposite to the unit flow outlet 114. The air supply fan 121 is in a state of sucking the cooling air Fa from the unit flow outlet 114. In the motor unit 100, as the cooling air Fa flows out from the unit flow outlet 114, the cooling air Fa flows into the unit flow inlet 112.

[0240] <Seventeenth embodiment> In the first embodiment, the motor housing 70 and the inverter housing 90 are arranged in the axial direction AD. In contrast, in the seventeenth embodiment, the motor housing 70 and the inverter housing 90 are arranged in the radial direction RD. The structure, function, and effect not particularly described in the seventeenth embodiment are the same as those in the first embodiment. In the seventeenth embodiment, the description will be centered on the points different from the first embodiment.

[0241] like Fig.24 , Fig.25 As shown, in the motor unit 100, the motor device 60 and the inverter device 80 are arranged in the radial direction RD. The inverter device 80 is arranged on the radial outer side of the motor device 60. In the unit housing 101, the inverter housing 90 is arranged on the radial outer side of the motor housing 70. The inverter housing 90 extends annularly along the outer peripheral surface of the motor housing 70 and in the circumferential direction CD. The motor space 74 is arranged on the radial inner side of the inverter space 94. The inverter space 94 extends annularly along the motor space 74 and in the circumferential direction CD.

[0242] In the unit housing 101, the unit peripheral wall surface 101c is formed by the inverter housing 90. The unit peripheral wall surface 101c includes the inverter peripheral wall surface 90c. The unit upstream wall surface 101a and the unit downstream wall surface 101b are formed by the motor housing 70 and the inverter housing 90. The unit upstream wall surface 101a includes the motor upstream wall surface 70a and the inverter upstream wall surface 90a. The unit downstream wall surface 101b includes the motor downstream wall surface 70b and the inverter downstream wall surface 90b.

[0243] In the motor housing 70, the motor inlet 112A is provided on the motor upstream wall surface 70a. The motor outlet 114A is provided on the motor downstream wall surface 70b. There are a plurality of motor inlets 112A and motor outlets 114A arranged in the circumferential direction CD. The inverter inlet 112B is provided on the inverter upstream wall surface 90a. The inverter outlet 114B is provided on the inverter downstream wall surface 90b. There are a plurality of inverter inlets 112B and inverter outlets 114B arranged in the circumferential direction CD.

[0244] In this embodiment, similarly to the thirteenth embodiment, the cooling air Fa passes through only one of the motor space 74 and the inverter space 94 and flows out from the unit outlet 114. In addition, the EPU 50 has a guide duct 790. Unlike the thirteenth embodiment, the guide duct 790 communicates with both the motor inlet 112A and the inverter inlet 112B. The guide duct 790 guides the motor air Fa1 in the cooling air Fa to the motor inlet 112A, and guides the inverter air Fa2 to the inverter inlet 112B.

[0245] <Eighteenth Embodiment> In the seventeenth embodiment, the motor unit 100 has one motor housing 70 and one inverter housing 90. In contrast, in the seventeenth embodiment, the motor unit 100 has a plurality of motor housings 70 and inverter housings 90. The structure, function, and effect not particularly described in the eighteenth embodiment are the same as those in the seventeenth embodiment. In the eighteenth embodiment, the description will be centered on the differences from the seventeenth embodiment.

[0246] like Fig.26 , Fig. 27 As shown, the motor unit 100 has one motor housing 70, but has a plurality of inverter housings 90. The unit housing 101 includes one motor housing 70 and a plurality of inverter housings 90. For example, two inverter housings 90 are contained in the unit housing 101. The motor housing 70 and the inverter housing 90 are arranged in the radial direction RD. For example, the two inverter housings 90 are arranged in the radial direction RD with one motor housing 70 between them. The plurality of inverter housings 90 respectively have inverter spaces 94, and respectively accommodate inverters 81.

[0247] In this embodiment, similarly to the seventeenth embodiment, the cooling air Fa passes through only one of the motor space 74 and the inverter space 94 and flows out from the unit outlet 114. For a plurality of inverter housings 90, the inverter air Fa2 flowing through one inverter space 94 does not flow through other inverter spaces 94 but flows out to the outside of the motor unit 100. Therefore, it is possible to prevent the heat of one inverter 81 from flowing into other inverter spaces 94 together with the inverter air Fa2.

[0248] <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.

[0249] In the above-mentioned embodiments, the foreign matter restricting part such as the labyrinth structure part 700 can be set at any position relative to the unit housing 101 as long as it can restrict the foreign matter MF from entering the interior of the housing from the housing inlet. For example, the foreign matter restricting part can also be set inside the unit housing 101 or inside the air supply device 120. For example, in the above-mentioned first embodiment, the labyrinth structure part 700 can also be set inside the air supply housing 125 or inside the motor housing 70.

[0250] In the above-mentioned embodiments, components such as the smoothing capacitor unit 580 and the arm switch unit 530 may be arbitrarily arranged inside the inverter housing 90. For example, the arm switch unit 530 may be arranged on the first drive surface 510a instead of being arranged on the inverter inner wall surface 91a. In addition, the arm switch unit 530 may be arranged at a position radially inward of the smoothing capacitor unit 580. Moreover, a plurality of drive gaps 94c may be arranged in the circumferential direction CD. There may also be no drive gap 94c between the drive substrate 510 and the inverter inner wall surface 91a.

[0251] 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.

[0252] In the above-mentioned embodiments, the cooling air fan such as the air supply fan 121 can be provided at any position as long as it can make the cooling air Fa flow inside the unit housing 101. For example, in the above-mentioned first embodiment, the air supply fan 121 can also be arranged with the unit housing 101 along the radial direction RD. In addition, the cooling air fan can also be provided inside the unit housing 101. For example, in the above-mentioned first embodiment, the air supply fan 121 can also be accommodated in the inverter housing 90. In addition, in the above-mentioned tenth embodiment, the rotors 300a and 300b that function as cooling air fans are accommodated in the motor housing 70.

[0253] In each of the above-mentioned embodiments, the cooling air fan may not be connected to the motor 61. For example, in the above-mentioned first embodiment, the air supply fan 121 may be provided in a state separated from the EPU shaft 51. In this structure, the air supply fan 121 rotates as driven by a driving source different from the motor 61. For example, the air supply fan 121 may also be an electric fan.

[0254] In each of the above-mentioned embodiments, the EPU 50 may not have a cooling air fan. For example, as in the above-mentioned eighth embodiment, the EPU 50 may not have an air supply device 120. In this structure, it is preferred that the propeller wind flows into the unit inlet 112 as the cooling wind Fa. For example, it is preferred that the unit inlet 112 is arranged at a position aligned with the blades 21 in the axial direction AD in a state facing the upwind side of the propeller wind.

[0255] In the above-mentioned embodiments, in the unit housing 101, the unit space 102 may not be divided into the motor space 74 and the inverter space 94. For example, in the above-mentioned first embodiment, the unit housing 101 may not have the partition plate 108. In this structure, if the motor space 74 is provided at a position communicating with the unit inlet 112 and the inverter space 94 is provided at a position communicating with the unit outlet 114, the cooling air Fa can easily flow from the motor space 74 into the inverter space 94.

[0256] In each of the above-mentioned embodiments, at least one of the motor 61 and the inverter 81 may be accommodated in a housing such as the unit housing 101. For example, in the above-mentioned first embodiment, the unit housing 101 may accommodate only one of the motor 61 and the inverter 81. For example, in a structure in which the motor 61 is accommodated in the unit housing 101, the motor 61 is cooled by the cooling air Fa flowing into the interior of the unit housing 101.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] (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.

[0262] (Technical Thought 1) A driving device, The driving device (50) is driven by electricity, wherein the driving device comprises: an electric motor (61) to which electric power is supplied; 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 shell inlet (112, 112A, 112B), the shell inlet being provided in the housing shell and allowing cooling air (Fa, Fa1, Fa2) for cooling the interior of the housing shell to flow from the exterior of the housing shell into the interior; a casing outlet (114, 114A, 114B), the casing outlet being provided in the housing casing and allowing the cooling air to flow out to the outside of the housing casing; and A foreign matter restricting portion (700, 750, 770) restricts foreign matter (MF) from entering the interior of the housing housing from the housing inlet.

[0263] (Technical Thought 2) According to the driving device recorded in technical idea 1, the above-mentioned casing inlet and the above-mentioned casing outlet are arranged so that the above-mentioned cooling air flowing into the interior of the above-mentioned housing casing from the above-mentioned casing inlet passes through the space (74) accommodating the above-mentioned motor, passes through the space (94) accommodating the above-mentioned inverter, and flows out from the above-mentioned casing outlet.

[0264] (Technical Thought 3) According to the driving device recorded in technical idea 1, the above-mentioned casing inlet and the above-mentioned casing outlet are arranged so that the above-mentioned cooling air flowing into the interior of the above-mentioned housing casing from the above-mentioned casing inlet passes through the space (94) accommodating the above-mentioned inverter, passes through the space (74) accommodating the above-mentioned motor and flows out from the above-mentioned casing outlet.

[0265] (Technical Thought 4) According to the driving device recorded in technical idea 1, the above-mentioned casing inlet and the above-mentioned casing outlet are arranged so that the above-mentioned cooling air flowing into the interior of the above-mentioned housing casing from the above-mentioned casing inlet only passes through one of the space (74) accommodating the above-mentioned motor and the space (94) accommodating the above-mentioned inverter and flows out from the above-mentioned casing outlet.

[0266] (Technical Thought 5) The drive device according to any one of technical concepts 1 to 4 includes a cooling air fan (121, 121A, 121B, 300a, 300b) which conveys cooling air in such a manner that the cooling air flowing into the casing inlet flows out from the casing outlet.

[0267] (Technical Thought 6) According to the driving device described in any one of the technical ideas 1 to 5, the foreign matter limiting portion includes a labyrinth structure portion (700), wherein the labyrinth structure portion has a curved labyrinth passage (710) which is connected to the shell inlet, and the entry of the foreign matter is limited by the labyrinth passage.

[0268] (Technical Thought 7) According to the driving device described in technical idea 6, The driving device is provided on a moving body (10) that moves by the rotation of a rotating body (20), and drives the rotating body to rotate by electric power. The labyrinth structure has a labyrinth inlet (711) for allowing the cooling air to flow into the labyrinth passage, and the labyrinth inlet is provided toward the leeward side of the rotating air generated by the rotation of the rotating body.

[0269] (Technical Thought 8) According to the driving device described in any one of technical concepts 1 to 7, the foreign matter limiting unit includes a foreign matter separating unit (750), and the foreign matter separating unit limits the entry of the foreign matter by separating the cooling air and the foreign matter by centrifugal force.

[0270] (Technical Thought 9) According to the driving device described in technical idea 8, The driving device is provided on a moving body (10) that moves by the rotation of a rotating body (20), and drives the rotating body to rotate by electric power. The foreign matter separation unit has a foreign matter discharge port (763) for discharging the foreign matter, and the foreign matter discharge port is arranged to face the leeward side of the rotating wind generated by the rotation of the rotating body.

[0271] (Technical Thought 10) According to the driving device described in any one of technical concepts 1 to 9, the foreign matter limiting unit includes a filtering filter (770), and the filtering filter limits the entry of the foreign matter by filtering the cooling air.

[0272] (Technical Thought 11) A driving device according to any one of technical ideas 1 to 10, wherein: 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 and the capacitor component are arranged so that the cooling wind cools the switch component after cooling the capacitor component.

[0273] (Technical Thought 12) According to the driving device described in technical idea 11, The inverter device comprises a wiring substrate (510). The wiring substrate is arranged such that its outer peripheral end (512) extends along the inner wall surface (91a) of the inverter housing, and is provided with the capacitor component. The switch component is provided between the capacitor component and the inner wall surface so that the cooling wind flowing along the wiring substrate toward the inner wall surface cools the capacitor component and then cools the switch component.

[0274] (Technical Thought 13) According to the driving device described in technical idea 12, The substrate includes a substrate gap (94c), which is a gap between the outer peripheral end and the inner wall surface and through which the cooling wind flows. The switch component is arranged so that the cooling air flows through the substrate gap after cooling the switch component.

[0275] (Technical Thought 14) According to the driving device described in the technical idea 12 or 13, it is characterized in that the above-mentioned switch component is arranged on the above-mentioned inner wall surface so that the heat of the above-mentioned switch component is transferred to the above-mentioned inner wall surface.

[0276] (Technical Thought 15) According to the driving device described in any one of technical concepts 1 to 14, the driving device is provided 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 electric power, the driving device comprising: an electric motor (61) to which electric power is supplied; 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 shell inlet (112, 112A, 112B), the shell inlet being provided in the housing shell and allowing cooling air (Fa, Fa1, Fa2) for cooling the interior of the housing shell to flow from the outside of the housing shell into the interior; a shell flow outlet (114, 114A, 114B), the shell flow outlet being arranged on the receiving shell and allowing the cooling air to flow out to the outside of the receiving shell; as well as A foreign matter restricting portion (700, 750, 770) restricts foreign matter (MF) from entering the interior of the housing housing through the housing inlet.

2. The driving device according to claim 1, characterized in that: The casing inlet and the casing outlet are arranged so that the cooling air flowing into the interior of the housing casing from the casing inlet passes through a space (74) for accommodating the motor, then passes through a space (94) for accommodating the inverter and flows out from the casing outlet.

3. The driving device according to claim 1, characterized in that: The casing inlet and the casing outlet are arranged so that the cooling air flowing into the interior of the housing casing from the casing inlet passes through the space (94) accommodating the inverter, then passes through the space (74) accommodating the motor and flows out from the casing outlet.

4. The driving device according to claim 1, characterized in that: The casing inlet and the casing outlet are arranged so that the cooling air flowing from the casing inlet into the interior of the housing casing passes through only one of the space (74) for housing the motor and the space (94) for housing the inverter and flows out from the casing outlet.

5. The driving device according to any one of claims 1 to 4, characterized in that: A cooling air fan (121, 121A, 121B, 300a, 300b) is included, which conveys cooling air in such a manner that the cooling air flowing into the casing inlet flows out from the casing outlet.

6. The driving device according to any one of claims 1 to 4, characterized in that: The foreign matter restricting portion includes a labyrinth structure portion (700) having a curved labyrinth passage (710) communicating with the housing inlet, and restricting entry of the foreign matter through the labyrinth passage.

7. The driving device according to claim 6, characterized in that: The driving device is provided on a moving body (10) that moves by the rotation of a rotating body (20), and drives the rotating body to rotate by electric power. The labyrinth structure portion includes a labyrinth inlet (711) for allowing the cooling air to flow into the labyrinth passage, and the labyrinth inlet is provided toward the leeward side of the rotating air generated by the rotation of the rotating body.

8. The driving device according to any one of claims 1 to 4, characterized in that: The foreign matter restricting unit includes a foreign matter separating unit (750) for separating the cooling air and the foreign matter by centrifugal force to restrict the entry of the foreign matter.

9. The driving device according to claim 8, characterized in that The driving device is provided on a moving body (10) that moves by the rotation of a rotating body (20), and drives the rotating body to rotate by electric power. The foreign matter separation unit has a foreign matter discharge port (763) for discharging the foreign matter, and the foreign matter discharge port is arranged to face the leeward side of the rotating wind generated by the rotation of the rotating body.

10. The driving device according to any one of claims 1 to 4, characterized in that: As the foreign matter limiting unit, a filtering filter (770) is included, and the filtering filter limits the entry of the foreign matter by filtering the cooling air.

11. The driving device according to any one of claims 1 to 4, 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 and the capacitor component are arranged so that the cooling air cools the switch component after cooling the capacitor component.

12. The driving device according to claim 11, characterized in that The inverter device has a wiring substrate (510) which is arranged such that its outer peripheral end (512) extends along the inner wall surface (91a) of the inverter housing and on which the capacitor component is mounted. The switch component is provided between the capacitor component and the inner wall surface so that the cooling air flowing along the wiring substrate toward the inner wall surface cools the capacitor component and then cools the switch component.

13. The driving device according to claim 12, characterized in that: The invention comprises a substrate gap (94c), wherein the substrate gap is a gap between the outer peripheral end and the inner wall surface and allows the cooling wind to flow through. The switch component is arranged so that the cooling air flows through the substrate gap after cooling the switch component.

14. 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.

15. The driving device according to any one of claims 1 to 4, 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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