Rotating electric machine

Abstract

The motor has a plurality of coil parts (215). In the coil part (215), a plurality of coil annular parts (701) are laminated in the winding axial direction (alpha). The plurality of coil loop sections (701) are formed from a coil wire (220). The plurality of coil annular parts (701) include divided annular parts (702). The divided annular section (702) has a conductor divided section (710) and a conductor integrated section (720). The conductor division section (710) has a division conductor (711) and a division gap (715) in addition to the coil cover (222). A plurality of split conductors (711) are arranged in the conductor split part (710) in the winding radial direction (gamma). Two divided conductors (711) adjacent to each other in the winding radial direction (gamma) are located at positions separated from each other via a division gap (715).

Description

[0001] Cross-references of related applications

[0002] This application is based on patent application No. 2022-137299 filed in Japan on August 30, 2022, and the contents of the base application are cited in their entirety by reference. Technical Field

[0003] The invention in this specification relates to a rotating electric machine. Background Art

[0004] Patent document 1 describes a rotary electric machine having an edgewise coil. In the rotary electric machine, the edgewise coil extends in the radial direction of the rotary electric machine. In the edgewise coil, the coil is wound in a manner that the rectangular wire is stacked in the radial direction. In Patent document 1, the coil of the stator is an edgewise coil, so that the coil occupancy rate can be increased.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2021-13258

[0008] However, in the above-mentioned Patent Document 1, it is considered that the cross-section of the conductor is enlarged due to the edgewise coil, which makes it easy for eddy current to be generated in the coil. Therefore, in the above-mentioned Patent Document 1, the DC copper loss is easily reduced by increasing the occupancy rate, but there is a concern that the AC copper loss is easily increased due to the enlarged cross-section. Summary of the invention

[0009] An object of the present invention is to provide a rotating electric machine capable of reducing loss in a coil portion.

[0010] The multiple methods disclosed in this specification adopt different technical means to achieve their respective purposes. In addition, the scope of the patent claim and the symbols in the brackets recorded in the item represent an example of the correspondence between one method and the specific means recorded in the implementation method described later, and do not limit the technical scope.

[0011] In order to achieve the above object, a first aspect of the invention is a rotating electric machine driven by supply of electric power, the rotating electric machine comprising:

[0012] a rotor that rotates about a rotation axis; and

[0013] The stator has a coil portion formed by winding a plate-shaped coil wire in a stacked manner in the axial direction of the rotation axis, and the stator and the rotor are arranged along the rotation axis.

[0014] The coil portion has a conductor arrangement portion, and the conductor arrangement portion is formed by dividing the conductor of the coil wire into a plurality of parts.

[0015] The conductor arrangement portion has:

[0016] an array conductor, a plurality of which are arrayed in a direction orthogonal to the winding direction of the coil wire; and

[0017] The intervening portion is provided between two adjacent arrangement conductors to separate the arrangement conductors.

[0018] According to the first embodiment, in the conductor arrangement portion of the coil portion, a plurality of arrangement conductors are arranged. In this structure, the cross section of the arrangement conductor can be miniaturized. Moreover, two adjacent arrangement conductors are arranged at positions separated from each other. In this structure, even if an eddy current is generated in the conductor arrangement portion, the eddy current flows separately in the plurality of arrangement conductors. Therefore, the eddy current flowing along the cross section of the arrangement conductor is difficult to increase. Therefore, the arrangement conductor can suppress the increase in AC copper loss due to the increase in eddy current.

[0019] In addition, in the coil part, the plate-shaped coil wire is wound in a stacked manner, so the occupancy rate is easily increased. Therefore, the increase of DC copper loss in the coil part can be suppressed. Through the above, losses such as DC copper loss and AC copper loss in the coil part can be reduced.

[0020] A rotating electric machine is driven by supply of electric power, the rotating electric machine comprising:

[0021] a rotor that rotates about a rotation axis; and

[0022] The stator has a coil portion formed by winding a plate-shaped coil wire in a stacked manner in the axial direction of the rotation axis, and the stator and the rotor are arranged along the rotation axis.

[0023] The coil part has:

[0024] a first occupied portion, in which a ratio of the conductor to the cross section of the coil wire is a first conductivity; and

[0025] a second occupying portion, the second occupying portion and the first occupying portion being arranged in the winding direction of the coil wire and having a ratio of a second conductivity,

[0026] The first conductivity is smaller than the second conductivity.

[0027] According to the second embodiment, in the coil portion, the first conductor ratio of the first occupied portion is less than the second conductor ratio of the second occupied portion. In this structure, since the proportion of the conductor in the first occupied portion is low, the eddy current flowing along the cross section of the conductor is easily reduced. Therefore, the first occupied portion can suppress the situation where the AC copper loss increases due to the increase in eddy current. Therefore, similarly to the first embodiment, the losses such as the DC copper loss and the AC copper loss generated in the coil portion can be reduced.

[0028] Moreover, in this structure, since the proportion of the conductor in the second occupying portion is high, the heat transfer in the second occupying portion is easier than that in the first occupying portion. That is, the heat dissipation effect of the second occupying portion is higher than that of the first occupying portion. Therefore, the second occupying portion can suppress the situation where heat accumulates in the coil portion. In this way, the heat dissipation effect of the coil portion can be improved by the second occupying portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a longitudinal sectional view of the EPU in the first embodiment.

[0030] Figure 2 It is a longitudinal sectional view of the motor device.

[0031] Figure 3 It is a cross-sectional view of the motor device.

[0032] Figure 4 It is a diagram showing the structure of eVTOL.

[0033] Figure 5 It is a diagram showing the electrical structure of the drive system.

[0034] Figure 6 This is a perspective view of the coil unit.

[0035] Figure 7 This is an exploded perspective view of the coil unit.

[0036] Figure 8 It is a diagram showing the winding direction of the coil wire in the coil unit.

[0037] Fig. 9 This is a side view of the coil unit as viewed from the first coil unit side.

[0038] Fig.10 This is a plan view of the divided annular portion of the coil unit as seen from the lead wire side.

[0039] Fig.11 It is a longitudinal sectional view of the conductor dividing portion.

[0040] Fig.12 It is a longitudinal sectional view of the conductor integral part.

[0041] Fig.13 This is a plan view of the integrated annular portion of the coil unit as viewed from the lead wire side.

[0042] Fig.14 This is a front view of the coil unit as seen from the outer wall peripheral side.

[0043] Fig.15 It is a diagram for explaining the pitch of the coil annular portion.

[0044] Fig.16 It is a diagram for explaining the thickness dimension of the coil conductor.

[0045] Fig.17 It is a longitudinal sectional view of the conductor dividing portion in the second embodiment.

[0046] Fig.18 This is a plan view of the divided annular portion in the third embodiment as viewed from the lead wire side.

[0047] Fig.19 It is a three-dimensional diagram of a crossed conductor.

[0048] Fig. 20 is a top view of the first crossing conductor and the second crossing conductor.

[0049] Fig.21 yes Fig. 20 Sectional view of line XXI-XXI.

[0050] Fig. 22 It is a diagram for explaining eddy current generated in the comparative example.

[0051] Fig.23 1 is a plan view of a first cross conductor and a second cross conductor in the fourth embodiment.

[0052] Fig.24 yes Fig.23 Sectional view along line XXIV-XXIV.

[0053] Fig.25 This is a side view of the coil unit according to the fifth embodiment, viewed from the first coil unit side.

[0054] Fig.26 This is a plan view of the mixed annular portion of the coil unit as seen from the lead wire side.

[0055] Fig. 27 It is a longitudinal sectional view of the mixing annular portion.

[0056] Fig.28 It is a longitudinal cross-sectional view of the uniform annular portion.

[0057] Fig.29 This is a plan view of the uniform annular portion of the coil unit as viewed from the lead wire side.

[0058] Fig.30 It is a diagram for explaining the thickness of the loop-shaped conductor in the sixth embodiment. DETAILED DESCRIPTION

[0059] Hereinafter, with reference to the accompanying drawings, a plurality of methods for implementing the present invention will be described. In each method, the same reference numerals may be given to the parts corresponding to the matters described in the previous method and the repeated description may be 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. In addition to the combination of parts that can be combined is specifically indicated in each embodiment, as long as the combination does not cause any special obstacles, the embodiments can be partially combined with each other even if it is not explicitly indicated.

[0060] <First embodiment>

[0061] Figure 4 The drive system 30 shown is mounted on the eVTOL 10. The eVTOL 10 is an electric vertical take-off and landing aircraft that can take off and land in a 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, also called an electric flying object. The eVTOL 10 is a manned aircraft for passengers. The drive system 30 is a system for driving the eVTOL 10 to fly.

[0062] 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 trunk of the fuselage 11, and has a shape extending forward and backward, for example. The fuselage body 12 has a passenger compartment for passengers. 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.

[0063] A plurality of propellers 20 are provided on the fuselage 11. The eVTOL 10 is a multirotor aircraft 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 wings 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 also called a rotor or a rotary wing.

[0064] The propeller 20 has blades 21 and a hub 22. A plurality of blades 21 are arranged in the circumferential direction of the propeller axis. The hub 22 connects the plurality of blades 21. The blades 21 extend from the hub 22 in the radial direction of the propeller axis. The propeller 20 has a propeller main shaft, not shown. The propeller main shaft is the rotation axis of the propeller 20, and extends from the hub 22 along the propeller axis. The propeller main shaft is also called a propeller shaft.

[0065] eVTOL10 is a tilt-rotor aircraft. In eVTOL10, the propeller 20 can be tilted. That is, the inclination angle of the propeller 20 can be adjusted. For example, when the eVTOL10 rises, the direction of the propeller 20 is set in such a way that the propeller axis extends in the up-down direction. In this case, the propeller 20 functions as a rotor for lifting that generates lift for the eVTOL10. By the propeller 20 functioning as a rotor for lifting, the eVTOL10 can be hovered and take off and land vertically. When the eVTOL10 moves forward, the direction of the propeller 20 is set in such a way that the propeller axis extends in the front-to-back direction. In this case, the propeller 20 functions as a cruise rotor for generating thrust for the eVTOL10.

[0066] The eVTOL 10 includes 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 can be electrically connected to a plurality of EPUs 50. The battery 31 is a power supply unit that supplies power to the EPU 50, and is equivalent to a power supply unit. The battery 31 is a DC voltage source that applies a DC voltage to the EPU 50. The battery 31 has a secondary battery that can be charged and discharged. The battery 31 also supplies power to the flight control device 40. In addition, as a power supply unit, a fuel cell, a generator, etc. may be used instead of the battery 31 or in addition.

[0067] The distributor 32 is electrically connected to the battery 31 and the plurality of EPUs 50. The distributor 32 distributes the electric power from the battery 31 to the plurality of EPUs 50. The electric power distributed by the distributor 32 to the EPUs 50 is driving power for driving the EPUs 50.

[0068] The flight control device 40 controls the drive system 30. The flight control device 40 performs flight control for flying the eVTOL 10. The flight control device 40 is connected to the plurality of EPUs 50 so as to be communicable. The flight control device 40 controls the plurality of EPUs 50 individually. The flight control device 40 controls the EPUs 50 via the control circuit 160 described later. The flight control device 40 controls the control circuit 160.

[0069] EPU50 is a device for driving the propeller 20 to rotate, and is equivalent to a drive device. EPU is the abbreviation of Electric Propulsion Unit. EPU50 is also called an electric drive device or an electric drive system. EPU50 is separately provided for each of the plurality of propellers 20. EPU50 is arranged along the propeller axis and the propeller 20. A plurality of EPU50 are fixed to the fuselage 11. EPU50 supports the propeller 20 so that it can rotate. EPU50 is connected to the propeller 20. The propeller 20 is fixed to the fuselage 11 via EPU50. When the inclination angle of the propeller 20 is changed, the angle of EPU50 is also changed.

[0070] The eVTOL 10 has a propulsion device 15. The propulsion device 15 is a device for propelling the eVTOL 10. The eVTOL 10 can perform flight such as ascending 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.

[0071] like Figure 1 , Figure 4 , Figure 5 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 motor device 60 is equivalent to a rotating motor. The inverter device 80 includes an inverter 81. The motor 61 is electrically connected to the battery 31 via the inverter 81. The motor 61 is driven by the power supplied from the battery 31 via the inverter 81.

[0072] 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 an electric 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 coil 211. The coil 211 is a winding that forms an armature. The coil 211 is respectively provided in the U phase, the V phase, and the W phase. In the motor 61, the multi-phase coils 211 are connected to each other at a neutral point 65.

[0073] exist Figure 5In the embodiment, 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 on multiple phases. The inverter 81 is, for example, a three-phase inverter that performs power conversion on the U phase, the V phase, and the W phase. The inverter device 8 is also called a power conversion device.

[0074] 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, also called a high potential line. The N line 142 is a power line on the low potential side, also called a low potential line.

[0075] The EPU 50 has an output line 143. The output line 143 is a power line for supplying power to the motor 61. The output line 143 electrically connects the motor 61 and the inverter 81. The output line 143 is in a state of being spanned between the motor device 60 and the inverter device 80.

[0076] The inverter device 80 includes a filter capacitor 145. The filter capacitor 145 is a capacitor that smoothes the DC voltage supplied from the battery 31. The filter capacitor 145 is connected to the P line 141 and the N line 142 between the battery 31 and the inverter 81. The filter capacitor 145 is connected in parallel with the inverter 81.

[0077] The inverter 81 is a power conversion circuit, for example, a DC-AC conversion circuit. The inverter 81 has upper and lower arm circuits 85 corresponding to the number of phases. For example, the inverter 81 has upper and lower arm circuits 85 for the U phase, the V phase, and the W phase, respectively. The upper and lower arm circuits 85 are also called branch (Japanese: レグ) circuits and arm circuits. The upper and lower arm circuits 85 have an upper arm 85a and a lower arm 85b. The upper arm 85a and the lower arm 85b are connected in series with the battery 31. The upper arm 85a is connected to the P line 141, and the lower arm 85b is connected to the N line 142.

[0078] The output line 143 is connected to the upper and lower arm circuits 85 for a plurality of phases. The output line 143 is connected between the upper arm 85a and the lower arm 85b. The output line 143 connects the upper and lower arm circuits 85 and the coil 211 for a plurality of phases. The output line 143 is connected to the side of the coil 211 opposite to the neutral point 65.

[0079] The upper arm 85a and the lower arm 85b 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 Metal-Oxide-Semiconductor Field-Effect Transistor. The arm switch 86 is a switching element that can convert power by opening and closing. The switching element can be a semiconductor element such as a power element. The arm switch 86 is a conversion switch for converting power.

[0080] The EPU 50 includes a control circuit 160. The control circuit 160 is included in the inverter device 80. The control circuit 160 controls the driving of the inverter 81. The control circuit 160 controls the driving of the motor 61 via the inverter 81. The control circuit 160 is also called a motor control unit. Figure 5 In FIG. 1 , the control circuit 160 is shown as CD.

[0081] The control circuit 160 is a control device such as an ECU. ECU is the abbreviation of Electronic Control Unit. The control circuit 160 is mainly composed of a microcomputer having a processor, a memory, an I / O, and a bus connecting these. The memory is a non-transitory physical storage medium that non-temporarily stores programs and data that can be read by a computer. In addition, the non-transitory physical storage medium is a non-transitory tangible storage medium, which is implemented by a semiconductor memory or a magnetic disk.

[0082] like Figure 1 As shown, in the EPU 50, the motor device 60 and the inverter device 80 are arranged in the axial direction AD along the motor axis Cm. The motor device 60 is arranged between the propeller 20 and the inverter device 80 in the axial direction AD. The motor axis Cm is the center line of the motor 61 and is an imaginary line extending in a straight line. The motor axis Cm is equivalent to the rotation axis. The axial direction AD is the direction in which the motor axis Cm extends.

[0083] With respect to the motor axis Cm, the axial direction AD, the circumferential direction CD and the radial direction RD are orthogonal to each other. The circumferential direction CD is the rotation direction of the motor 61. With respect to the radial direction RD, the outer side is also referred to as the radial outer side, the outer peripheral side, and the inner side is also referred to as the radial inner side, the inner peripheral side. The motor axis Cm is consistent with the propeller axis. The axial direction AD is also referred to as the motor axial direction AD, the radial direction RD is also referred to as the motor radial direction RD, and the circumferential direction CD is also referred to as the motor circumferential direction CD. In addition, the motor axis Cm may also be located at a position offset from the propeller axis to the radial direction RD. Figure 1 A longitudinal section of the EPU 50 taken along the motor axis Cm is shown.

[0084] The EPU 50 includes a motor housing 70 and an inverter housing 90. The motor housing 70 is included in the motor device 60. The motor housing 70 accommodates the motor 61. The inverter housing 90 is included in the inverter device 80. The inverter housing 90 accommodates the inverter 81. The motor housing 70 and the inverter housing 90 are connected to each other.

[0085] The EPU 50 includes: a motor peripheral wall 71, an inverter peripheral wall 91, an inverter cover 99, a rear frame 370, and a drive frame 390. The peripheral walls 71, 91, the inverter cover 99, the rear frame 370, and the drive frame 390 are formed of metal materials and the like and have thermal conductivity. The motor peripheral wall 71 and the inverter peripheral wall 91 extend in an annular shape along the circumferential direction CD. The inverter cover 99, the rear frame 370, and the drive frame 390 are formed in a plate shape and extend in a direction orthogonal to the axial direction AD.

[0086] The motor housing 70 is formed to include: a motor peripheral wall 71, a rear frame 370, and a drive frame 390. The inverter housing 90 is formed to include: an inverter peripheral wall 91, an inverter cover 99, and a rear frame 370. The motor peripheral wall 71 and the inverter peripheral wall 91 are arranged in the axial direction AD via the rear frame 370. The inverter cover 99 and the drive frame 390 are arranged in the axial direction AD via the motor peripheral wall 71, the inverter peripheral wall 91, and the rear frame 370.

[0087] The motor housing 70 has a motor fin 72. The motor fin 72 is provided on the outer surface of the motor peripheral wall 71. The motor fin 72 extends from the motor peripheral wall 71 toward the peripheral side. The motor fin 72 is a heat dissipation fin that releases the heat of the motor device 60 to the outside. The inverter housing 90 has an inverter fin 92. The inverter fin 92 is provided on the outer surface of the inverter peripheral wall 91. The inverter fin 92 extends from the inverter peripheral wall 91 toward the peripheral side. The inverter fin 92 is a heat dissipation fin that releases the heat of the inverter device 80 to the outside.

[0088] like Figure 1 , Figure 2 As shown, 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 rotators. 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 annularly along the circumferential direction CD. The center line of the stator 200 is consistent with the motor axis Cm.

[0089] The motor device 60 is an axial gap type rotating motor. The motor 61 is an axial gap type motor. In the motor 61, the stator 200 and the rotors 300a, 300b are arranged in the axial direction AD along the motor axis Cm. The motor device 60 is a dual-rotor type rotating motor. The motor 61 is a dual-rotor type motor. The first rotor 300a and the second rotor 300b are arranged in the axial direction AD via the stator 200. The stator 200 is arranged between the first rotor 300a and the second rotor 300b. The stator 200 is located at a position away from the rotors 300a, 300b in the axial direction AD. The motor 61 of this embodiment is also called a dual-axis motor.

[0090] 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 propeller 20.

[0091] The motor shaft 340 has 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 rotors 300a and 300b are located at a position away from the shaft body 341 to the radial outside.

[0092] The rotors 300a and 300b have magnets 310 and magnet holders 320. A plurality of magnets 310 are arranged in the circumferential direction CD in each of the rotors 300a and 300b. The magnets 310 are permanent magnets that form a magnetic field. In the rotors 300a and 300b, the magnets 310 generate magnetic flux. The magnets 310 of the first rotor 300a and the magnets 310 of the second rotor 300b are arranged in the axial direction AD via the stator 200. The magnet holder 320 supports the magnets 310. The magnet holder 320 forms the periphery of the rotors 300a and 300b as a whole. The magnet holder 320 is fixed to the shaft flange 342.

[0093] The motor device 60 includes a first bearing 360 and a second bearing 361. The bearings 360 and 361 rotatably support the motor shaft 340. The first bearing 360 and the second bearing 361 are arranged in the axial direction AD via the shaft flange 342. The first bearing 360 is fixed to the rear frame 370. The second bearing 361 is fixed to the drive frame 390.

[0094] The motor device 60 has a busbar unit 260. The busbar unit 260 extends annularly in the circumferential direction CD. The busbar unit 260 and the stator 200 are arranged in the radial direction RD. The busbar unit 260 has a power busbar 261 and a busbar protection portion 270. The power busbar 261 and the busbar protection portion 270 extend annularly in the circumferential direction CD. The power busbar 261 is formed of a busbar component having conductivity. The power busbar 261 forms at least a portion of the output line 143. The busbar protection portion 270 is formed of a resin material or the like and has electrical insulation. The busbar protection portion 270 protects the power busbar 261 while covering it.

[0095] like Figure 2 , Figure 3 As shown, the stator 200 extends in a ring shape in the circumferential direction CD. The stator 200 has a coil unit 210 and a coil protection portion 250. The coil unit 210 and the coil protection portion 250 extend in a ring shape in the circumferential direction CD. The coil unit 210 has a multi-phase coil 211. The coil protection portion 250 protects at least the coil 211 of the coil unit 210. The coil protection portion 250 is in a state of covering the coil 211. The coil protection portion 250 is formed of a resin material or the like. The coil protection portion 250 has electrical insulation. The coil protection portion 250 has thermal conductivity. In addition, in Figure 2 , Figure 3 In the figure, the coil protection portion 250 is omitted. Figure 2 A longitudinal section of the motor device 60 along the motor axis Cm is shown. Figure 3 A cross section of the motor device 60 cut along a direction orthogonal to the motor axis Cm is shown.

[0096] The coil protection part 250 is in contact with the coil 211. The coil protection part 250 is in contact with the motor housing 70. For example, the coil protection part 250 is in contact with the inner surface of the motor outer peripheral wall 71. In the case where the coil 211 generates heat, the heat is easily transferred to the motor housing 70 via the coil protection part 250. For example, the heat transferred to the motor housing 70 is released to the outside from the motor outer peripheral wall 71 via the motor fins 72.

[0097] The coil unit 210 has a coil portion 215. The coil portion 215 is formed in a cylindrical shape and extends in the axial direction AD. A plurality of coil portions 215 are arranged in the circumferential direction CD. The coil portion 215 forms a coil 211. In the coil unit 210, a multi-phase coil 211 is formed by a plurality of coil portions 215. The coil unit 210 has a coil portion unit 219. The coil portion unit 219 has a plurality of coil portions 215. For example, the coil portion unit 219 has two coil portions 215. The coil portion unit 219 forms a coil 211 of one phase among the multi-phases. A plurality of coil portion units 219 are arranged in the circumferential direction CD.

[0098] like Figure 6 , Figure 7 As shown, the coil unit 219 includes a first coil portion 215a and a second coil portion 215b. The first coil portion 215a and the second coil portion 215b are included in the plurality of coil portions 215. The first coil portion 215a and the second coil portion 215b are adjacent to each other in the circumferential direction CD.

[0099] The coil unit 219 has: a power lead wire 212, a neutral lead wire 213 and a coil connection wire 218. The power lead wire 212 is a state of being led out from the first coil portion 215a. The power lead wire 212 electrically connects the first coil portion 215a to the power bus 261. The power lead wire 212 and the first coil portion 215a are arranged in the axial direction AD. For example, the power lead wire 212 extends from the first coil portion 215a toward the power bus 261 side along the axial direction AD.

[0100] The neutral lead wire 213 is a state of being led out from the second coil portion 215b. The neutral lead wire 213 electrically connects the second coil portion 215b to the neutral point 65. The neutral lead wire 213 and the second coil portion 215b are arranged in the axial direction AD. For example, the neutral lead wire 213 extends from the second coil portion 215b toward the same side as the power lead wire 212 along the axial direction AD.

[0101] The coil connection wire 218 electrically connects the first coil portion 215a and the second coil portion 215b and is provided on the opposite side of the lead wires 212 and 213 via the coil portions 215a and 215b in the axial direction AD.

[0102] The coil portion 215 is formed by a wound coil wire 220. The coil wire 220 is wound around the winding axis Cw. The winding axis Cw is the center line of the coil portion 215. The winding axis Cw extends along the motor axial direction AD. With respect to the winding axis Cw, the axial direction α, the circumferential direction β, and the radial direction γ are orthogonal to each other. The axial direction α is also referred to as the winding axial direction α, the circumferential direction β is also referred to as the winding circumferential direction β, and the radial direction γ is also referred to as the winding radial direction γ. The winding axial direction α is consistent with the motor axial direction AD. With respect to the winding radial direction γ, the outer side is also referred to as the radial outer side, the outer peripheral side, and the inner side is also referred to as the radial inner side, the inner peripheral side.

[0103] The coil wire 220 is a plate-shaped electric wire. For example, the coil wire 220 is a rectangular wire. In the coil portion 215, the coil wire 220 is wound in a stacked manner on the winding axial direction α. ​​The coil wire 220 extends in a manner orthogonal to the winding axial direction α. ​​For example, the coil portion 215 is an oblong coil. In the coil portion 215, the winding circumferential direction β is the winding direction of the coil wire 220. The winding direction is the direction in which the coil wire 220 is wound. In addition, the winding axial direction α is the thickness direction of the coil wire 220. The winding radial direction γ is the width direction of the coil wire 220. In the coil portion 215, the cross section of the coil wire 220 is formed into a flat shape in a manner that extends along the winding radial direction γ. The cross section of the coil wire 220 is a cross section of the coil wire 220 cut off on the winding circumferential direction β.

[0104] like Figures 9 to 12 As shown, the coil wire 220 has a coil conductor 221 and a coil cover 222. The coil conductor 221 is formed of a conductive material such as copper and has conductivity. The coil conductor 221 is formed in a plate shape and extends in a manner orthogonal to the winding axis α. The coil conductor 221 is equivalent to a conductor. The coil cover 222 covers the coil conductor 221. The coil cover 222 is formed of a resin material, a rubber material, etc., and has electrical insulation.

[0105] like Figure 6 , Figure 7 As shown, the coil portion 215 has a coil annular portion 701. A plurality of coil annular portions 701 are stacked in the winding axial direction α. ​​The plurality of coil annular portions 701 are connected to each other. The coil annular portion 701 is formed by the coil wire 220. The coil annular portion 701 is formed into a flat shape in a manner extending along the motor radial direction RD. In the coil annular portion 701, the long side portion extends along the motor radial direction RD, and the short side portion extends along the motor circumferential direction CD.

[0106] The coil annular portion 701 has an annular conductor 701a and an annular cover 701b. The annular conductor 701a and the annular cover 701b extend annularly in the winding circumferential direction β. The annular conductor 701a is formed by the coil conductor 221. The annular cover 701b is formed by the coil cover 222. In two coil annular portions 701 adjacent to each other in the winding axial direction α, the annular covers 701b are in contact with each other.

[0107] like Fig. 9As shown, the plurality of coil annular portions 701 include a lead-out annular portion 705, a connecting annular portion 706, and a central annular portion 707. The plurality of coil annular portions 701 include a pair of coil annular portions 701 disposed at the outermost sides in the winding axial direction α. ​​One of the pair of coil annular portions 701 is the lead-out annular portion 705, and the other is the connecting annular portion 706. In the coil portion 215, the lead wires 212 and 213 extend from the lead-out annular portion 705. For example, in the first coil portion 215a, the power lead wire 212 extends from the lead-out annular portion 705. In the second coil portion 215b, the neutral lead wire 213 extends from the lead-out annular portion 705.

[0108] In the coil portion 215, the coil connection wire 218 extends from the connection annular portion 706. For example, the coil connection wire 218 connects the connection annular portion 706 of the first coil portion 215a and the connection annular portion 706 of the second coil portion 215b. The central annular portion 707 is a coil annular portion 701 arranged at the center of the coil portion 215 in the winding axial direction α. ​​The central annular portion 707 included in the plurality of coil annular portions 701 may be one or two.

[0109] The lead-out annular portion 705 is arranged on the side closest to the first rotor 300a among the plurality of coil annular portions 701 in the winding axial direction α. ​​That is, the lead-out annular portion 705 is located closest to the first rotor 300a. The connecting annular portion 706 is arranged on the side closest to the second rotor 300b among the plurality of coil annular portions 701 in the winding axial direction α. ​​That is, the connecting annular portion 706 is located closest to the second rotor 300b. The lead-out annular portion 705 and the connecting annular portion 706 are equivalent to the closest annular portions.

[0110] like Figure 8 As shown, in the first coil portion 215a and the second coil portion 215b, the coil wire 220 is wound in opposite directions. For example, when the coil portions 215a and 215b are viewed from the lead-out annular portion 705, in the first coil portion 215a, the coil wire 220 is wound to the left. In the second coil portion 215b, the coil wire 220 is wound to the right.

[0111] Regarding the coil portion 215, a lead-out area Aa, a connection area Ab, and an intermediate area Ac are set. In the coil portion 215, a plurality of coil annular portions 701 are respectively arranged in any one of the areas Aa, Ab, and Ac. The areas Aa, Ab, and Ac are in a state where the coil portion 215 is divided in the winding axial direction α. ​​In the winding axial direction α, the lead-out area Aa and the connection area Ab are arranged in the winding axial direction α via the intermediate area Ac. The lead-out area Aa is arranged on the lead wire 212, 213 side relative to the intermediate area Ac. The connection area Ab is arranged on the coil connection wire 218 side relative to the intermediate area Ac.

[0112] At least one coil annular portion 701 is provided in each of the regions Aa, Ab, and Ac. For example, a plurality of coil annular portions 701 are provided in each of the regions Aa, Ab, and Ac. At least a lead-out annular portion 705 is provided in the lead-out region Aa. At least a connection annular portion 706 is provided in the connection region Ab. A central annular portion 707 is provided in the intermediate region Ac.

[0113] The stator 200 has a coil bobbin 240. A coil portion 215 is mounted on the coil bobbin 240. The coil bobbin 240 is formed of a resin material or the like and has electrical insulation properties. The coil bobbin 240 has a coil bobbin trunk 241 and a coil bobbin flange 242. The coil bobbin trunk 241 is formed in a columnar shape and extends along the winding axis α. The coil bobbin flange 242 extends from the coil bobbin trunk 241 toward the outer peripheral side. A pair of coil bobbin flanges 242 are arranged in the winding axis α via the coil bobbin trunk 241. The coil portion 215 is in a state of being wound around the coil bobbin trunk 241 between a pair of coil bobbin flanges 242.

[0114] The stator 200 has a core (not shown). The core is provided in the coil bobbin 240. For example, the core is built in the coil bobbin 240. The coil portion 215 is wound around the core via the coil bobbin 240.

[0115] In the coil portion 215, the number of the coil annular portions 701 in the lead-out area Aa and the number of the coil annular portions 701 in the connection area Ab are less than the number of the coil annular portions 701 in the middle area Ac. The coil annular portions 701 in the lead-out area Aa and the coil annular portions 701 in the connection area Ab are the same number. The total of the number of the coil annular portions 701 in the lead-out area Aa and the number of the coil annular portions 701 in the connection area Ab is less than the number of the coil annular portions 701 in the middle area Ac. In addition, the total may be equal to or more than the number of the coil annular portions 701 in the middle area Ac.

[0116] like Fig. 9 , Fig.10 , Fig.13 As shown, the coil part 215 has an outer wall side peripheral part 731, an axis side peripheral part 732 and an opposite peripheral part 733. The peripheral parts 731, 732, 733 extend along the winding circumferential direction β. The peripheral parts 731, 732, 733 are arranged in the winding circumferential direction β. The peripheral parts 731, 732, 733 are all part of the coil wire 220.

[0117] The outer wall side peripheral portion 731 forms an outer peripheral end of the motor radial direction RD in the coil portion 215. The outer wall side peripheral portion 731 extends in the motor circumferential direction CD along the inner surface of the motor outer peripheral wall 71. The shaft side peripheral portion 732 forms an inner peripheral end of the motor radial direction RD in the coil portion 215. The shaft side peripheral portion 732 extends in the motor circumferential direction CD along the outer surface of the shaft body 341. The outer wall side peripheral portion 731 and the shaft side peripheral portion 732 are equivalent to the circumferential extension portion.

[0118] A pair of relative peripheral portions 733 are arranged in the motor circumferential direction CD. A pair of relative peripheral portions 733 are opposite to each other via the inner space of the coil portion 215. For example, a pair of relative peripheral portions 733 are opposite to each other via the coil skeleton 240. The relative peripheral portions 733 form the side ends of the motor circumferential direction CD in the coil portion 215. The relative peripheral portions 733 extend along the motor radial direction RD. The relative peripheral portions 733 connect the outer wall side peripheral portion 731 with the shaft side peripheral portion 732. The relative peripheral portions 733 are equivalent to the radial extension portion.

[0119] The coil portion 215 is roughly rectangular in a plan view. For example, the coil portion 215 is roughly trapezoidal in a plan view. The outer wall side peripheral portion 731 and the shaft side peripheral portion 732 extend almost straight in the motor circumferential direction CD. The outer wall side peripheral portion 731 and the shaft side peripheral portion 732 are arranged parallel to each other. A pair of relative peripheral portions 733 extend almost straight in the motor radial direction RD. The pair of relative peripheral portions 733 are inclined to each other.

[0120] like Fig. 9 As shown, the plurality of coil annular portions 701 include split annular portions 702 and an integral annular portion 703. In the split annular portion 702, at least a portion of the annular conductor 701a is divided into a plurality of portions in a direction orthogonal to the winding circumferential direction β. In the integral annular portion 703, the annular conductor 701a is not in a branched state. At least the lead-out annular portion 705 of the plurality of coil annular portions 701 is a split annular portion 702. For example, all the coil annular portions 701 provided in the lead-out area Aa are split annular portions 702. At least the connecting annular portion 706 of the plurality of coil annular portions 701 is a split annular portion 702. For example, all the coil annular portions 701 provided in the connecting area Ab are split annular portions 702. At least the central annular portion 707 of the plurality of coil annular portions 701 is an integral annular portion 703. For example, all the coil annular portions 701 provided in the intermediate area Ac are an integral annular portion 703.

[0121] like Figure 10 to Figure 12 As shown, the split annular portion 702 includes a conductor split portion 710 and a conductor integral portion 720. The conductor split portion 710 and the conductor integral portion 720 extend along the winding circumferential direction β. The conductor split portion 710 and the conductor integral portion 720 are arranged in the winding circumferential direction β.

[0122] In the conductor split portion 710, the annular conductor 701a is divided into a plurality of parts in a direction perpendicular to the winding circumferential direction β. For example, in the conductor split portion 710, the annular conductor 701a is divided into a plurality of parts in the winding radial direction γ. In the conductor integrated portion 720, the annular conductor 701a is not divided into a plurality of parts.

[0123] At least a portion of the conductor segmentation portion 710 is included in a pair of opposing circumferential portions 733. The conductor segmentation portion 710 extends in the motor radial direction RD in a manner that it is bridged between the outer wall side circumferential portion 731 and the shaft side circumferential portion 732 in the opposing circumferential portion 733. At least a portion of the conductor integral portion 720 is included in the outer wall side circumferential portion 731 and the shaft side circumferential portion 732. The conductor integral portion 720 extends in the motor circumferential direction CD in a manner that it is bridged between a pair of opposing circumferential portions 733 in the outer wall side circumferential portion 731 and the shaft side circumferential portion 732.

[0124] like Fig.10 , Fig.11 As shown, the conductor splitting portion 710 has a split conductor 711 and a splitting gap 715 in addition to the annular cover 701b. A plurality of split conductors 711 are arranged in the winding radial direction γ. The split conductor 711 extends along the winding circumferential direction β. For example, the split conductor 711 extends almost straight in the motor radial direction RD. A plurality of split conductors 711 are arranged parallel to each other. A plurality of split conductors 711 are included in the annular conductor 701a. In the conductor splitting portion 710, the annular conductor 701a is divided into a plurality of parts in the winding radial direction γ, thereby forming a plurality of split conductors 711. In the coil portion 215, the split annular portion 702 is equivalent to the arrangement annular portion, and the conductor splitting portion 710 is equivalent to the conductor arrangement portion. The split conductor 711 is equivalent to the arrangement conductor and the width arrangement conductor.

[0125] The split gap 715 is a gap between two adjacent split conductors 711. Two adjacent split conductors 711 in the winding radial direction γ are located at positions separated from each other in the winding radial direction γ by the split gap 715. The split gap 715 separates these split conductors 711 by being provided between two adjacent split conductors 711. The split gap 715 extends along the split conductor 711 in the winding circumferential direction β. The split gap 715 is equivalent to an intervening portion. The split gap 715 is also called a gap or a slit. A plurality of split gaps 715 are arranged in the winding radial direction γ. Gas such as air exists in the split gap 715. The thermal conductivity of the split gap 715 is lower than that of the split conductor 711. The electrical conductivity of the split gap 715 is lower than that of the split conductor 711.

[0126] In the conductor dividing portion 710, the distance Ls between two adjacent divided conductors 711 is smaller than the thickness dimension Ts of the divided conductor 711 in the winding axial direction α. ​​In addition, the distance Ls is smaller than the width dimension Ws of the divided conductor 711 in the winding radial direction γ. For example, the cross section of the divided conductor 711 is flattened so as to extend in the winding radial direction γ. In the divided conductor 711, the width dimension Ws is larger than the thickness dimension Ts.

[0127] like Fig.10 , Fig.12 As shown, the conductor integral part 720 has an integral conductor 721 in addition to the annular cover 701b. The integral conductor 721 extends along the winding circumferential direction β. In the conductor integral part 720, the annular conductor 701a is not divided into a plurality of parts, so a single integral conductor 721 is formed. In the split annular part 702, the conductor split part 710 is extended from the conductor integral part 720 to the winding circumferential direction β. In the boundary between the conductor split part 710 and the conductor integral part 720, the integral conductor 721 extends along the winding radial direction γ in a manner of being bridged over a plurality of split conductors 711. The integral conductor 721 is a state in which a plurality of split conductors 711 are connected.

[0128] The presence or absence of the dividing gap 715 in the coil annular portion 701 causes a difference in conductivity. The conductivity is the ratio of the annular conductor 701a to the cross section of the coil annular portion 701. For example, the conductivity is the ratio of the cross-sectional area of ​​the annular conductor 701a to the cross-sectional area of ​​the coil annular portion 701.

[0129] exist Fig.11 , Fig.12 , the split conductor ratio OC1 of the conductor split portion 710 is less than the integral conductor ratio OC2 of the conductor integral portion 720. The split conductor ratio OC1 is the ratio of the plurality of split conductors 711 in the cross section of the conductor split portion 710. For example, the split conductor ratio OC1 is the ratio of the total cross-sectional area SC1 of the plurality of split conductors 711 to the cross-sectional area SW1 of the conductor split portion 710. The cross-sectional area SW1 includes the cross-sectional area of ​​the coil cover 222, the cross-sectional area of ​​the split conductor 711, and the cross-sectional area of ​​the split gap 715. The total cross-sectional area SC1 is the sum of the cross-sectional areas of the plurality of split conductors 711. The total cross-sectional area SC1 does not include the cross-sectional area of ​​the split gap 715.

[0130] The integral conductor ratio OC2 is the ratio of the integral conductor 721 to the cross section of the integral conductor part 720. For example, the integral conductor ratio OC2 is the ratio of the cross-sectional area SC2 of the integral conductor 721 to the cross-sectional area SW2 of the integral conductor part 720. The cross-sectional area SW2 includes the cross-sectional area of ​​the coil cover 222 and the cross-sectional area of ​​the integral conductor 721.

[0131] For example, in the conductor dividing portion 710 and the conductor integrated portion 720, the cross-sectional areas SW1 and SW2 are the same. On the other hand, the total cross-sectional area SC1 of the plurality of divided conductors 711 is smaller than the cross-sectional area SC2 of the integrated conductor 721 by the cross-sectional area of ​​the dividing gap 715. Therefore, the divided conductor ratio OC1 is smaller than the integrated conductor ratio OC2 by the amount of the dividing gap 715 in the conductor dividing portion 710. In addition, the conductor dividing portion 710 is equivalent to the first occupied portion, and the conductor integrated portion 720 is equivalent to the second occupied portion. The divided conductor ratio OC1 is equivalent to the first conductor ratio, and the integrated conductor ratio OC2 is equivalent to the second conductor ratio.

[0132] The split density D1 of the split conductors 711 is the same as the integral density D2 of the integral conductor 721. The split density D1 is the volume density of the split conductors 711. The split density D1 is the mass per unit volume of the split conductors 711. The integral density D2 is the volume density of the integral conductor 721. The integral density D2 is the mass per unit volume of the integral conductor 721.

[0133] like Fig.13 As shown, the integral annular portion 703 has a conductor integral portion 720 but does not have a conductor split portion 710. In the integral annular portion 703, the conductor integral portion 720 extends annularly in the winding circumferential direction β. For example, in the integral annular portion 703, the integral conductor 721 extends annularly in the winding circumferential direction β.

[0134] like Fig.14 , Fig.15 As shown, in the coil unit 219, the first coil 215a and the second coil 215b are provided with a lead-out area Aa, a connection area Ab, and an intermediate area Ac, respectively. As the lead-out area Aa, the connection area Ab, and the intermediate area Ac, the first coil 215a is provided with a first lead-out area Aa1, a first connection area Ab1, and a first intermediate area Ac1. As the second coil 215b, the second lead-out area Aa2, the second connection area Ab2, and the second intermediate area Ac2 are provided.

[0135] The pitch of the annular conductors 701a is not uniform in the coil portion 215. The pitch is the distance between two adjacent annular conductors 701a in the winding axial direction α. ​​For example, the pitch is the distance between the centers of two adjacent annular conductors 701a.

[0136] In the first coil portion 215a, the first lead pitch Pa1 in the first lead area Aa1 is different from the first connection pitch Pb1 in the first connection area Ab1. For example, the first lead pitch Pa1 is greater than the first connection pitch Pb1. That is, the relationship Pa1>Pb1 holds. The first lead pitch Pa1 is the interval between two adjacent annular conductors 701a in the winding axial direction α in the first lead area Aa1. The first connection pitch Pb1 is the interval between two adjacent annular conductors 701a in the winding axial direction α in the first connection area Ab1.

[0137] In the second coil portion 215b, the second lead pitch Pa2 in the second lead area Aa2 is different from the second connection pitch Pb2 in the second connection area Ab2. For example, the second connection pitch Pb2 is greater than the second lead pitch Pa2. That is, the relationship Pb2>Pa2 holds. The second lead pitch Pa2 is the spacing between two adjacent annular conductors 701a in the winding axial direction α in the second lead area Aa2. The second connection pitch Pb2 is the spacing between two adjacent annular conductors 701a in the winding axial direction α in the second connection area Ab2.

[0138] In the coil unit 219, the spacing of the loop conductor 701a in the first coil 215a and the second coil 215b is not uniform. For example, the first connection spacing Pb1 and the second connection spacing Pb2 are the same, but the first lead spacing Pa1 is greater than the second lead spacing Pa2. That is, the relationship of Pa1>Pb1=Pb2>Pa2 holds.

[0139] In the coil part 215, the thickness of the annular cover 701b is uneven. On the other hand, in the coil part 215, the thickness of the annular conductor 701a is uniform. Thus, in the coil part 215, the spacing of the annular conductor 701a is uneven due to the uneven thickness of the annular cover 701b. The thickness of the annular conductor 701a and the thickness of the annular cover 701b are the thickness dimensions in the winding axial direction α.

[0140] In the coil portion 215, the spacing of the annular conductor 701a in the intermediate area Ac is the same as the spacing of the annular conductor 701a in the connection area Ab. For example, in the first coil portion 215a, the first intermediate spacing in the first intermediate area Ac1 is the same as the first connection spacing Pb1. The first intermediate spacing is the spacing between two adjacent annular conductors 701a in the winding axial direction α in the first intermediate area Ac1. In the second coil portion 215b, the second intermediate spacing in the second intermediate area Ac2 is the same as the second connection spacing Pb2. The second intermediate spacing is the spacing between two adjacent annular conductors 701a in the winding axial direction α in the second intermediate area Ac2.

[0141] like Fig.15As shown, in the first coil portion 215a, the first lead cover thickness TIa1 in the first lead area Aa1 and the first connection cover thickness TIb1 in the first connection area Ab1 are different. For example, the first lead cover thickness TIa1 is greater than the first connection cover thickness TIb1. That is, the relationship TIa1>TIb1 holds. The first lead cover thickness TIa1 is the thickness dimension of the annular cover 701b located in the first lead area Aa1. The first connection cover thickness TIb1 is the thickness dimension of the annular cover 701b located in the first connection area Ab1. In the first coil portion 215a, even if the thickness of the annular conductor 701a is the same in the first lead area Aa1 and the first connection area Ab1, since the first lead cover thickness TIa1 is greater than the first connection cover thickness TIb1, the first lead pitch Pa1 is greater than the first connection pitch Pb1. In addition, the thickness of the annular conductor 701a is referred to as the channel conductor thickness TC1 described later.

[0142] In the second coil portion 215b, the second lead cover thickness TIa2 in the second lead area Aa2 is different from the second connection cover thickness TIb2 in the second connection area Ab2. For example, the second lead cover thickness TIa2 is smaller than the second connection cover thickness TIb2. That is, the relationship TIa2<TIb2 holds. The second lead cover thickness TIa2 is the thickness dimension of the annular cover 701b located in the second lead area Aa2. The second connection cover thickness TIb2 is the thickness dimension of the annular cover 701b located in the second connection area Ab2. In the second coil portion 215b, even if the thickness of the annular conductor 701a is the same in the second lead area Aa2 and the second connection area Ab2, since the second lead cover thickness TIa2 is smaller than the second connection cover thickness TIb2, the second lead pitch Pa2 is smaller than the second connection pitch Pb2.

[0143] In the coil unit 219, the thickness of the annular cover 701b is not uniform in the first coil 215a and the second coil 215b. For example, the first connection cover thickness TIb1 and the second connection cover thickness TIb2 are the same, but the first lead cover thickness TIa1 is greater than the second lead cover thickness TIa2. That is, the relationship TIa1>TIb1=TIb2>TIa2 holds.

[0144] In the coil portion 215, the thickness of the annular cover 701b in the middle area Ac is the same as the thickness of the annular cover 701b in the connection area Ab. For example, in the first coil portion 215a, the thickness of the first middle cover in the first middle area Ac1 is the same as the first connection cover thickness TIb1. The first middle cover thickness is the thickness dimension of the annular cover 701b in the first middle area Ac1. In the second coil portion 215b, the thickness of the second middle cover in the second middle area Ac2 is the same as the second connection cover thickness TIb2. The second middle cover thickness is the thickness dimension of the annular cover 701b in the second middle area Ac2.

[0145] like Fig.14 , Fig.16 As shown, the coil annular portion 701 has a channel portion 741 and a channel change portion 742. The channel portion 741 and the channel change portion 742 extend along the winding circumferential direction β. The channel portion 741 and the channel change portion 742 are arranged along the winding circumferential direction β in a state of being connected to each other. The channel portion 741 and the channel change portion 742 are both parts of the coil wire 220.

[0146] The channel portion 741 extends along the winding circumferential direction β in a manner orthogonal to the winding axis Cw. The channel change portion 742 extends along the winding circumferential direction β in a manner inclined relative to the channel portion 741. The channel change portion 742 is equivalent to the channel inclined portion. In two coil annular portions 701 adjacent to each other in the winding axial direction α, the channel change portion 742 on one side connects the channel portion 741 on the one side with the channel portion 741 on the other side. The channel change portion 742 is in a state of being bridged between the channel portion 741 on one side and the channel portion 741 on the other side in the winding axial direction α.

[0147] In the plurality of coil annular portions 701 stacked in the winding axial direction α, a plurality of each channel portion 741 is stacked in the winding axial direction α, and a plurality of each channel change portion 742 is stacked in the winding axial direction α. ​​The plurality of channel portions 741 are arranged in parallel. Two adjacent channel portions 741 in the winding axial direction α are in contact with each other. The plurality of channel change portions 742 are arranged in parallel. Two adjacent channel change portions 742 in the winding axial direction α are in contact with each other.

[0148] In the coil portion 215, the thickness of the channel portion 741 and the channel change portion 742 are set in such a manner that no gap is generated between two coil annular portions 701 adjacent to each other in the winding axial direction α. ​​For example, the thickness of the channel portion 741 is greater than the thickness of the channel change portion 742. The thickness of the channel portion 741 is the thickness dimension of the channel portion 741 in the channel cross section perpendicular to the direction in which the channel portion 741 extends. The thickness of the channel change portion 742 is the thickness dimension of the channel change portion 742 in the change cross section perpendicular to the direction in which the channel change portion 742 extends.

[0149] In the coil annular portion 701, the thickness of the annular cover 701b is the same at the channel portion 741 and the channel change portion 742. On the other hand, the thickness of the annular conductor 701a is different at the channel portion 741 and the channel change portion 742.

[0150] like Fig.16 As shown, the changed conductor thickness TC2 in the channel change portion 742 is smaller than the channel conductor thickness TC1 in the channel portion 741. The channel conductor thickness TC1 is the thickness dimension of the annular conductor 701a in the channel cross section. The changed conductor thickness TC2 is the thickness dimension of the annular conductor 701a in the changed cross section. In this way, in the coil portion 215, even if the thickness of the annular cover 701b is the same at the channel portion 741 and the channel change portion 742, since the changed conductor thickness TC2 is smaller than the channel conductor thickness TC1, it is difficult to generate a gap between two adjacent coil annular portions 701 in the winding axial direction α.

[0151] In the coil annular portion 701, the changed conductor height TC3 in the channel change portion 742 is greater than the changed conductor thickness TC2. For example, the changed conductor height TC3 is the same value as the channel conductor thickness TC1. The changed conductor height TC3 is the height dimension of the annular conductor 701a in the axial cross section extending parallel to the winding axis Cw. That is, the changed conductor height TC3 is the height dimension of the annular conductor 701a in the winding axial direction α.

[0152] A coil annular portion 701 includes a channel portion 741 and a channel change portion 742. The coil annular portion 701 changes the channel in any one of the outer wall side peripheral portion 731, the shaft side peripheral portion 732 and the relative peripheral portion 733. For example, Fig.14 As shown, the coil annular portion 701 changes the channel at the outer wall side peripheral portion 731. In the coil annular portion 701, the channel change portion 742 is provided on the outer wall side peripheral portion 731, but is not provided on the shaft side peripheral portion 732 and the relative peripheral portion 733. The channel portion 741 is provided in a state of being bridged on a pair of relative peripheral portions 733 via the shaft side peripheral portion 732. A part of the channel portion 741 may also be provided on the outer wall side peripheral portion 731.

[0153] like Fig.11 As shown, in the coil portion 215, an eddy current Ie is generated in the coil conductor 221. The eddy current Ie flows vortically along the cross section of the coil conductor 221 in a manner orthogonal to the winding circumferential direction β. The eddy current Ie is generated due to the connection between the magnetic flux generated in the rotors 300a and 300b and the coil conductor 221. In the coil portion 215, the larger the cross section of the coil conductor 221, the easier it is for the eddy current Ie to become larger. In the coil portion 215, there is a concern that the larger the eddy current Ie, the greater the AC copper loss. The AC copper loss includes the eddy current loss caused by the eddy current Ie.

[0154] In contrast, according to the present embodiment, in the conductor dividing portion 710, a plurality of split conductors 711 are arranged. In this structure, the cross-section of the split conductor 711 can be miniaturized. Moreover, two split conductors 711 adjacent to each other in a direction orthogonal to the winding circumferential direction β are arranged at positions separated from each other. In this structure, even if an eddy current Ie is generated in the conductor dividing portion 710, the eddy current Ie flows individually in each of the plurality of split conductors 711. In this way, the range in which the eddy current Ie flows is limited to a narrow range of the cross-section of the split conductor 711, so that the eddy current Ie is difficult to increase. Therefore, the split conductor 711 can suppress the increase in AC copper loss and eddy current loss caused by the increase in eddy current Ie.

[0155] In addition, in the coil portion 215, the plate-shaped coil wire 220 is wound in a stacked manner on the motor axial direction AD. In this structure, the occupancy rate of the coil conductor 221 in the coil portion 215 is likely to be high, so the increase in DC copper loss in the coil portion 215 can be suppressed. That is, in the conductor segmentation portion 710, even if the coil conductor 221 is divided into a plurality of segmented conductors 711, the overall shape of the coil conductor 221 such as a plate is maintained. Therefore, in the conductor segmentation portion 710, the cross-section of the coil conductor 221 is enlarged, so that it becomes difficult to increase the resistance of the coil conductor 221. Therefore, even the conductor segmentation portion 710 can suppress the increase in DC copper loss.

[0156] As described above, in the motor 61 , losses such as the DC copper loss and the AC copper loss in the coil portion 215 can be reduced.

[0157] According to the present embodiment, a plurality of split conductors 711 are arranged in the winding radial direction γ. In this structure, a plurality of split conductors 711 are formed by the plate-shaped coil conductor 221 extending in the winding radial direction γ being split in the winding radial direction γ. Therefore, since it is not necessary to make the shape of the split conductor 711 complicated, it is difficult for the plurality of split conductors 711 to contact each other. Therefore, for example, it is possible to suppress the flow of a large eddy current Ie through the contact portion of two adjacent split conductors 711.

[0158] In the coil portion 215, there are coil annular portions 701 that are easy to generate eddy current Ie and coil annular portions 701 that are not easy to generate eddy current Ie. For example, among the plurality of coil annular portions 701, the coil annular portions 701 that are closer to the rotors 300a and 300b are more likely to generate eddy current Ie. In the coil portion 215, eddy current Ie is most likely to be generated in the lead-out annular portion 705 and the connecting annular portion 706. In the lead-out annular portion 705 and the connecting annular portion 706, eddy current Ie is easily generated because the magnetic flux from the rotors 300a and 300b is easily linked, etc.

[0159] In contrast, according to the present embodiment, at least the lead-out annular portion 705 and the connecting annular portion 706 of the plurality of coil annular portions 701 of the coil portion 215 are split annular portions 702. In this structure, the generation of the eddy current Ie can be suppressed by the conductor splitting portion 710 for the lead-out annular portion 705 and the connecting annular portion 706, which are most likely to generate the eddy current Ie in the coil portion 215. In the conductor splitting portion 710, even if the magnetic flux from the rotors 300a and 300b is linked to the plurality of split conductors 711, it is difficult to generate the eddy current Ie because the split conductors 711 are miniaturized. In this way, in addition to reducing the AC copper loss in the coil portion 215, it is also effective to suppress the eddy current Ie in the lead-out annular portion 705 and the connecting annular portion 706.

[0160] In the coil portion 215, in addition to the lead-out annular portion 705 and the connecting annular portion 706, there is also a concern that the eddy current Ie is easily generated in the coil annular portion 701 located in the lead-out area Aa and the connecting area Ab. In this regard, in the present embodiment, the coil annular portion 701 located in the lead-out area Aa and the connecting area Ab is a split annular portion 702. Therefore, the eddy current Ie can also be reduced by the conductor splitting portion 710 for the coil annular portion 701 located in the lead-out area Aa and the connecting area Ab.

[0161] In the coil portion 215, the more the coil annular portion 701 is away from the rotors 300a and 300b, the more difficult it is to generate eddy current Ie. In the coil portion 215, the eddy current Ie is most difficult to generate in the central annular portion 707. In the central annular portion 707, it is difficult to generate eddy current Ie because the magnetic flux from the rotors 300a and 300b is difficult to link, etc. That is, in the winding axial direction α, it is difficult to generate eddy current Ie in the coil annular portion 701 such as the central annular portion 707 located on the side opposite to the rotors 300a and 300b via the lead annular portion 705 and the connecting annular portion 706.

[0162] In addition, in the conductor segmentation portion 710, the segmentation gap 715 easily becomes a thermal resistance through the two adjacent segmentation conductors 711. For example, the heat transfer from one of the two segmentation conductors 711 to the other is easily restricted by the segmentation gap 715. Therefore, in the conductor segmentation portion 710, there is a concern that the heat dissipation effect in the winding radial direction γ is reduced due to the segmentation gap 715. On the other hand, in the conductor integrated portion 720, since there is no segmentation gap 715, the thermal resistance is reduced. Therefore, in the conductor integrated portion 720, the heat generated in the integrated conductor 721 is easily transferred to the winding radial direction γ. Therefore, in the conductor integrated portion 720, the heat dissipation effect from the integrated conductor 721 to the winding radial direction γ is high.

[0163] Therefore, according to the present embodiment, the integral annular portion 703 is provided on the side opposite to the rotors 300a and 300b via the lead-out annular portion 705 and the connecting annular portion 706. In this structure, in the coil portion 215, the coil annular portion 701 located at a position where the eddy current Ie is difficult to generate is provided as the integral annular portion 703. Therefore, even if all the coil annular portions 701 of the coil portion 215 do not become the divided annular portions 702, a structure in which the AC copper loss is difficult to increase can be achieved.

[0164] Furthermore, as described above, the conductor integral part 720 has a higher heat dissipation effect in the winding radial direction γ than the conductor segmented part 710. Therefore, even if the heat dissipation effect in the winding radial direction γ of the coil part 215 is reduced in the segmented annular part 702 due to the segmented gap 715, the heat dissipation effect in the winding radial direction γ of the coil part 215 can be improved by the integral annular part 703. Therefore, the temperature rise of the coil part 215 as a whole can be suppressed.

[0165] In addition, the volume of the coil conductor 221 in the integral annular portion 703 is larger than the volume of the coil conductor 221 in the split annular portion 702 by an amount equivalent to that of the integral annular portion 703 without the split gap 715. Therefore, even if the occupancy rate of the coil portion 215 is reduced by the split annular portion 702, the occupancy rate of the coil portion 215 can be increased by the integral annular portion 703. Therefore, as a whole, the DC copper loss of the coil portion 215 can be reduced.

[0166] In the coil portion 215, in addition to the central annular portion 707, it is also difficult to generate eddy current Ie for the coil annular portion 701 located in the middle area Ac. Therefore, in this embodiment, the coil annular portion 701 located in the middle area Ac becomes an integrated annular portion 703. Therefore, for all the coil annular portions 701 located in the middle area Ac, it is possible to achieve both an improved heat dissipation effect in the winding radial direction γ and a reduced DC copper loss.

[0167] In the present embodiment, in the motor radial direction RD, the motor peripheral wall 71 is provided outside the coil portion 215. Therefore, in the coil portion 215, by improving the heat dissipation effect from the integral annular portion 703 to the winding radial direction γ, heat can be transferred from the integral annular portion 703 to the motor peripheral wall 71 with low thermal resistance.

[0168] According to the present embodiment, a split gap 715 is provided between two adjacent split conductors 711. In this structure, the flow of the eddy current Ie across the two adjacent split conductors 711 is limited by the gas present in the split gap 715. Therefore, the range of the flow of the eddy current Ie can be limited by the split gap 715 in a manner that the eddy current Ie flows individually in the plurality of split conductors 711.

[0169] In the coil annular portion 701, there are portions where eddy current Ie is easily generated and portions where eddy current Ie is difficult to generate. For example, in the coil annular portion 701, eddy current Ie is easily generated in the relative circumference 733 because the magnetic flux from the rotors 300a and 300b is easy to link, etc. On the other hand, in the outer wall side circumference 731 and the shaft side circumference 732, eddy current Ie is difficult to generate because the magnetic flux from the rotors 300a and 300b is difficult to link, etc.

[0170] In this regard, according to the present embodiment, the conductor dividing portion 710 is provided at least at the relative peripheral portion 733 of the coil annular portion 701. In this structure, for the relative peripheral portion 733 where the eddy current Ie is easily generated, the generation of the eddy current Ie can be suppressed by the conductor dividing portion 710. In this way, in addition to reducing the AC copper loss in the coil annular portion 701, it is also effective to suppress the eddy current Ie in the relative peripheral portion 733.

[0171] In addition, according to the present embodiment, the conductor integral part 720 is provided at least on the outer wall side periphery 731 and the shaft side periphery 732 of the coil annular part 701. In this structure, for the outer wall side periphery 731 and the shaft side periphery 732 where eddy current Ie is difficult to generate, it is possible to avoid the heat dissipation effect in the winding radial direction γ being reduced due to the segmentation gap 715. Therefore, in the segmented annular part 702, the eddy current Ie in the relative periphery 733 can be reduced by the conductor segmentation part 710, and the heat dissipation effect in the outer wall side periphery 731 and the shaft side periphery 732 can be improved by the conductor integral part 720. That is, in the segmented annular part 702, both the reduction of AC copper loss and the improvement of heat dissipation effect can be achieved.

[0172] In the dual-axis motor 61, the coil portion 215 is located between the first rotor 300a and the second rotor 300b, so the magnetic flux from the rotors 300a and 300b is easily linked to the coil portion 215. Therefore, in the coil portion 215, eddy current Ie is easily generated in the coil annular portion 701. In this regard, according to the present embodiment, the eddy current Ie in the coil annular portion 701 can be reduced by dividing the conductor 711. Therefore, it is effective to use the divided conductor 711 in the dual-axis motor 61 that is easy to generate eddy current Ie in order to reduce the eddy current Ie.

[0173] In addition, since the coil portion 215 is located between the first rotor 300a and the second rotor 300b in the motor axial direction AD, the heat of the coil portion 215 is difficult to be released in the motor axial direction AD. Therefore, in the dual-shaft motor 61, the heat dissipation effect of the coil portion 215 may be reduced.

[0174] In this regard, in the present embodiment, a conductor integral part 720 is provided on the outer wall side circumference 731 in both the split annular part 702 and the integral annular part 703. In the conductor integral part 720, heat dissipation toward the motor outer peripheral wall 71 due to the restriction of the split gap 715 in the motor radial direction RD does not occur. That is, the heat dissipation from the coil part 215 to the motor outer peripheral wall 71 is promoted by the conductor integral part 720. In this way, in the dual-axis motor 61 in which the heat dissipation direction from the coil part 215 is restricted to the motor radial direction RD, it is effective to improve the heat dissipation effect from the coil part 215 to the motor outer peripheral wall 71 by the conductor integral part 720.

[0175] According to the present embodiment, the motor 61 is driven to make the eVTOL 10 fly. In this structure, when the eVTOL 10 flies due to the drive of the motor 61, it is possible to suppress the reduction in the output of the motor 61 due to the AC copper loss and the DC copper loss. Therefore, by reducing the loss with the split conductor 711, the safety of the eVTOL 10 can be improved.

[0176] According to the present embodiment, in the coil portion 215, the split conductor ratio OC1 is smaller than the integral conductor ratio OC2. In this structure, the eddy current Ie flowing along the cross section of the coil conductor 221 is easily reduced due to the low ratio of the coil conductor 221 in the conductor split portion 710. Therefore, the increase in AC copper loss caused by the increase in the eddy current Ie can be suppressed by the conductor split portion 710.

[0177] Furthermore, since the proportion of the coil conductor 221 in the conductor integral part 720 is high, the heat transfer in the conductor integral part 720 is easier than that in the conductor segmented part 710. That is, the heat dissipation effect of the conductor integral part 720 is higher than that of the conductor segmented part 710. Therefore, the conductor integral part 720 can suppress the accumulation of heat in the coil part 215. In this way, the heat dissipation effect of the coil part 215 can be improved by the conductor integral part 720.

[0178] According to the present embodiment, in the coil annular portion 701, the conductor thickness TC2 is changed to be smaller than the channel conductor thickness TC1. In this structure, even if it is assumed that the thickness of the annular cover 701b is the same at the channel portion 741 and the channel change portion 742, it is possible to suppress the generation of a gap between two adjacent coil annular portions 701 in the motor axial direction AD. In other words, it is not necessary to make the annular cover 701b of one of the channel portion 741 and the channel change portion 742 thinner than the annular cover 701b of the other party. Therefore, it is possible to avoid the situation where the electrical insulation of the portion where the annular cover 701b is thinned is insufficient. In other words, for the annular cover 701b, the thickness required for electrical insulation in the coil annular portion 701 can be ensured. Therefore, the electrical insulation based on the coil cover 222 in the coil portion 215 can be improved. In addition, making the annular cover 701b thicker will ensure the required insulation distance for the annular conductor 701a.

[0179] For example, a structure in which the channel conductor thickness TC1 and the changed conductor thickness TC2 are the same, which is different from the present embodiment, is assumed. In this structure, if the thickness of the annular cover 701b is the same in the channel portion 741 and the channel change portion 742, a gap is likely to be generated between two adjacent channel portions 741 in the motor axial direction AD. In this regard, as a method for preventing a gap from being generated between the two channel portions 741, a method of making the annular cover 701b in the channel change portion 742 thinner than the annular cover 701b in the channel portion 741 can be considered. However, in this method, there is a concern that the electrical insulation of the annular cover 701b in the channel change portion 742 is insufficient.

[0180] In the channel change portion 742, since the annular conductor 701a becomes thinner, there is a concern that heat may be easily generated due to an increase in resistance. In this regard, in the present embodiment, the channel change portion 742 is provided at the outer wall side peripheral portion 731. Therefore, even if heat is easily generated in the channel change portion 742, the heat is easily released to the outside through the motor outer peripheral wall 71. Therefore, the heat dissipation effect of the channel change portion 742 can be improved.

[0181] In addition, in the present embodiment, the channel change portion 742 is shortened to such an extent that it can be included in the outer wall side peripheral portion 731 in the winding circumferential direction β. In this structure, in the coil annular portion 701, the thinned portion of the annular conductor 701a can be greatly shortened. Therefore, even if the resistance increases in the thinned portion of the annular conductor 701a, the increase in resistance can be suppressed to a slight increase as the annular conductor 701a as a whole. Therefore, in the annular conductor 701a, the overall temperature rise and the temperature rise of a wide range of parts can be suppressed.

[0182] In the coil unit 219, there are parts that require high electrical insulation and parts that only require a certain degree of electrical insulation for the coil cover 222. For example, since the voltage from the inverter 81 is applied to the power lead wire 212, etc., the lead ring portion 705 of the first coil portion 215a is included in the part that requires high electrical insulation. On the other hand, since the neutral lead wire 213 is connected to the neutral point 65, etc., the lead ring portion 705 of the second coil portion 215b is included in the part that only requires a certain degree of electrical insulation.

[0183] In this regard, in the present embodiment, in the coil unit 219, the first lead-out cover thickness TIa1 is greater than the second lead-out cover thickness TIa2. Therefore, in the first coil unit 215a, for the lead-out annular portion 705 that requires high electrical insulation, the electrical insulation can be improved by thickening the annular cover 701b. On the other hand, in the second coil unit 215b, for the lead-out annular portion 705 that has a certain degree of electrical insulation, the proportion of the annular conductor 701a can be increased and the occupancy rate can be improved by thinning the annular cover 701b. Therefore, in the coil unit 219, it is possible to achieve both the suppression of the lack of electrical insulation and the reduction of DC copper loss.

[0184] In addition, in the first coil portion 215a, the first connection cover thickness TIb1 is smaller than the first lead cover thickness TIa1. Therefore, in the first coil portion 215a, the electrical insulation of the lead ring portion 705 can be improved, and for the connection ring portion 706 that has a certain degree of electrical insulation, the occupancy rate can be increased by thinning the ring cover 701b. Therefore, even in the first coil portion 215a, both the lack of electrical insulation and the reduction of DC copper loss can be achieved.

[0185] Moreover, in the second coil portion 215b, the second connection cover thickness TIb2 is greater than the second lead cover thickness TIa2. Therefore, in the second coil portion 215b, the occupancy rate can be increased in the lead-out annular portion 705, and for the connection annular portion 706 that requires a certain degree of electrical insulation, the lack of electrical insulation can be suppressed by thickening the annular cover 701b. Therefore, even in the second coil portion 215b, both the lack of electrical insulation and the reduction of DC copper loss can be achieved.

[0186] <Second embodiment>

[0187] In the first embodiment, a split gap 715 is provided between two adjacent split conductors 711. In contrast, in the second embodiment, an insulating portion is provided between two adjacent split conductors 711. The structure, function, and effect not particularly described in the second embodiment are the same as those in the first embodiment. In the second embodiment, the description will be centered on the points different from the first embodiment.

[0188] like Fig.17 As shown, the coil cover 222 has a cover base 222a and a cover extension 222b. The cover base 222a and the cover extension 222b are formed of a resin material or a rubber material and have electrical insulation. The cover base 222a and the cover extension 222b are formed integrally. The cover base 222a is in a state of covering the plurality of segmented conductors 711 as a whole. The cover base 222a is in a state of being mounted on the plurality of segmented conductors 711 in the winding radial direction γ.

[0189] The cover extension portion 222b extends inward from the cover base portion 222a in such a manner as to enter between two adjacent split conductors 711. The cover extension portion 222b separates these split conductors 711 by being provided between two adjacent split conductors 711. The cover extension portion 222b extends along the split conductors 711 in the winding circumferential direction β. The cover extension portion 222b is equivalent to an intervening portion and an insulating portion. A plurality of cover extension portions 222b are arranged in the winding radial direction γ. The cover extension portion 222b is in a state of entering the split gap 715 of the first embodiment described above. The electrical insulation of the cover extension portion 222b is higher than that of gases such as air.

[0190] According to the present embodiment, the cover extension portion 222b is provided between two adjacent segmented conductors 711. In this structure, the cover extension portion 222b restricts the eddy current Ie from flowing across two adjacent segmented conductors 711. Therefore, the range of the eddy current Ie flow can be restricted by the cover extension portion 222b so that the eddy current Ie flows individually through the plurality of segmented conductors 711.

[0191] In addition, the cover extension 222b may be a component independent of the cover base 222a. For example, in a state where the segmented conductors 711 and the cover extension 222b are alternately arranged in the winding radial direction γ, the cover base 222a is configured to cover these segmented conductors 711 and the cover extension 222b as a whole. In addition, as long as the insulating portion such as the cover extension 222b has electrical insulation, the electrical insulation of the cover extension 222b may also be lower than that of a gas such as air. Moreover, the intervening portion such as the cover extension 222b may not be an insulating portion. For example, the conductivity of the intervening portion may be lower than that of the coil conductor 221. The electrical conductivity of the intervening portion may be lower than that of the coil conductor 221. In addition, the electrical insulation of the intervening portion may be higher than that of the coil conductor 221.

[0192] <Third Embodiment>

[0193] In the first embodiment, two adjacent split conductors 711 extend parallel to each other. In contrast, in the third embodiment, two adjacent split conductors 711 cross each other. 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 that are different from the first embodiment.

[0194] like Fig.18 , Fig.19 As shown, the conductor dividing portion 710 has a cross conductor 751. A plurality of cross conductors 751 are arranged in a direction orthogonal to the winding circumferential direction β. The cross conductor 751 extends as a whole along the winding circumferential direction β. For example, the cross conductor 751 extends as a whole along the motor radial direction RD. A plurality of cross conductors 751 are included in the annular conductor 701a. In the conductor dividing portion 710, the annular conductor 701a is divided into a plurality of parts in a direction orthogonal to the winding circumferential direction β, thereby forming a plurality of cross conductors 751. The cross conductor 751 is equivalent to an arranged conductor.

[0195] In the conductor dividing portion 710, at least two cross conductors 751 cross each other. In other words, at least two cross conductors 751 are transposed with each other. If at least two cross conductors 751 that cross each other are called a cross group, the conductor dividing portion 710 has at least one cross group. For example, in the conductor dividing portion 710, a plurality of cross groups are arranged in the winding radial direction γ. At least two cross conductors 751 cross in the winding radial direction γ in a manner that a portion of each overlaps in the winding axial direction α.

[0196] For example, in the conductor dividing portion 710, the first cross conductor 751a and the second cross conductor 751b cross each other. The first cross conductor 751a and the second cross conductor 751b are included in the plurality of cross conductors 751. The first cross conductor 751a and the second cross conductor 751b are a cross group. The first cross conductor 751a and the second cross conductor 751b cross in the winding radial direction γ in such a manner that a portion of each overlaps in the winding axial direction α.

[0197] Furthermore, the conductor dividing portion 710 may include at least one split conductor 711 in addition to the plurality of crossing conductors 751. In this structure, for example, one crossing group and one split conductor 711 are located adjacent to each other in the winding circumferential direction β.

[0198] like Fig.19 , Fig. 20 , Fig.21 As shown, the cross conductor 751 has an outer conductor 755, an inner conductor 756, and an inclined conductor 757. The outer conductor 755 and the inner conductor 756 extend along the winding circumferential direction β. For example, the outer conductor 755 and the inner conductor 756 extend almost straight in the motor radial direction RD. The outer conductor 755 is arranged on the outside compared to the inner conductor 756 in the winding radial direction γ. That is, the outer conductor 755 is located on the outer side of the coil portion 215 compared to the inner conductor 756. The outer conductor 755 and the inner conductor 756 are arranged along the winding circumferential direction β in a state of being staggered in the winding radial direction γ.

[0199] The inclined conductor 757 connects the outer conductor 755 and the inner conductor 756. The inclined conductor 757 is provided between the outer conductor 755 and the inner conductor 756. The inclined conductor 757 is inclined in the winding radial direction γ relative to the outer conductor 755 and the inner conductor 756. In the winding axial direction α, the inclined conductor 757 is thinner than the outer conductor 755 and the inner conductor 756. The cross-sectional area of ​​the inclined conductor 757 is the same as the cross-sectional area of ​​the outer conductor 755 and the cross-sectional area of ​​the inner conductor 756.

[0200] The first cross conductor 751a and the second cross conductor 751b both have an outer conductor 755, an inner conductor 756, and an inclined conductor 757. For example, the first cross conductor 751a has a first outer conductor 755a, a first inner conductor 756a, and a first inclined conductor 757a. The second cross conductor 751b has a second outer conductor 755b, a second inner conductor 756b, and a second inclined conductor 757b.

[0201] In one crossing group, the positions of the outer conductor 755 and the inner conductor 756 are opposite in the winding circumferential direction β in at least one crossing conductor 751 and the remaining crossing conductors 751. In addition, the inclined conductor 757 of at least one crossing conductor 751a and the inclined conductor 757 of the remaining crossing conductors 751 are arranged in the winding axial direction α.

[0202] For example, in the first cross conductor 751a and the second cross conductor 751b, the first outer conductor 755a and the second outer conductor 755b are arranged in the winding circumferential direction β, and the first inner conductor 756a and the second inner conductor 756b are arranged in the winding circumferential direction β. In addition, the first outer conductor 755a and the second inner conductor 756b are arranged in the winding radial direction γ, and the second outer conductor 755b and the first inner conductor 756a are arranged in the winding radial direction γ. The first inclined conductor 757a and the second inclined conductor 757b are arranged in the winding axial direction α. ​​The first inclined conductor 757a and the second inclined conductor 757b are in a state of overlapping in the winding axial direction α.

[0203] In the split annular portion 702, the first cross conductor 751a and the second cross conductor 751b are connected by each of a pair of integral conductors 721. One of the pair of integral conductors 721 is provided outside the motor radial direction RD such as the outer wall side peripheral portion 731, and the other is provided inside the motor radial direction RD such as the shaft side peripheral portion 732.

[0204] In the coil portion 215, a cross conductor 751 is arranged similarly to the split conductor 711 in the first embodiment. For example, in the split annular portion 702, a cross conductor 751 is provided in the relative circumference 733. In addition, a cross conductor 751 is provided in the coil annular portion 701 provided in the lead-out region Aa and the connection region Ab.

[0205] In the conductor dividing portion 710, the intersection of the cross conductor 751 is arranged in the winding radial direction γ along the intersection line Ci. In the cross conductor 751, the inclined conductor 757 is the intersection. The intersection line Ci is an imaginary line extending linearly, passing through the center of the inclined conductor 757 and extending in the winding radial direction γ. The intersection line Ci is orthogonal to both the winding axial direction α and the motor radial direction RD.

[0206] For example, the intersection of the first cross conductor 751a and the second cross conductor 751b is the first oblique conductor 757a and the second oblique conductor 757b. The center of the first oblique conductor 757a and the center of the second oblique conductor 757b are arranged in the winding axis α. The first cross conductor 751a and the second cross conductor 751b are arranged at a position where the intersection line Ci passes through the center of the oblique conductors 757a and 757b.

[0207] like Fig.18As shown, an outer wall side region Ai1 and an axis side region Ai2 are set for the inner side of the coil portion 215. The outer wall side region Ai1 and the axis side region Ai2 are arranged along the motor radial direction RD on the inner side of the coil annular portion 701. The outer wall side region Ai1 and the axis side region Ai2 are separated by the intersection line Ci. The outer wall side region Ai1 and the axis side region Ai2 are set between a pair of relative peripheral portions 733. The outer wall side region Ai1 is the region between the outer wall side peripheral portion 731 and the intersection line Ci. The axis side region Ai2 is the region between the axis side peripheral portion 732 and the intersection line Ci.

[0208] The outer wall side area Si1 of the outer wall side region Ai1 and the axial side area Si2 of the axial side region Ai2 are the same. The outer wall side area Si1 is the area of ​​the outer wall side region Ai1 when viewed from above. The axial side area Si2 is the area of ​​the axial side region Ai2 when viewed from above. In the conductor dividing portion 710, an inclined conductor 757 is arranged at a position where the outer wall side area Si1 and the axial side area Si2 become the same. The inclined conductor 757 is arranged at the magnetic center of gravity position in the motor radial direction RD.

[0209] like Fig. 20 , Fig.21 As shown, in the conductor splitting portion 710, in one crossing group, a splitting gap 715 is provided between at least two crossing conductors 751 that cross each other. The splitting gap 715 is also provided between two crossing groups adjacent to each other in the winding radial direction γ. In addition, the splitting gap 715 may also be provided between the crossing group and the split conductor 711.

[0210] The dividing gap 715 is, for example, provided between the first crossing conductor 751a and the second crossing conductor 751b. The dividing gap 715 is located between the first outer conductor 755a and the second inner conductor 756b. In addition, the dividing gap 715 is located between the first inner conductor 756a and the second outer conductor 755b. Furthermore, the dividing gap 715 is located between the first oblique conductor 757a and the second oblique conductor 757b.

[0211] For example, unlike the present embodiment, a comparative example is assumed in which a plurality of segmented conductors 711 are connected by a single conductor 721 in the segmented annular portion 702 as in the first embodiment. Fig. 22 As shown, the plurality of split conductors 711 include a first split conductor 711a and a second split conductor 711b. The first split conductor 711a and the second split conductor 711b are located adjacent to each other in the winding radial direction γ. The first split conductor 711a and the second split conductor 711b are connected by each of a pair of integral conductors 721. One of the pair of integral conductors 721 is provided on the outside of the motor radial direction RD, and the other is provided on the inside of the motor radial direction RD. In addition, Fig. 22 In the figure, the integral conductor 721 is omitted.

[0212] In the split annular portion 702 of the comparative example, a circulating current 10c may be generated as the rotors 300a and 300b rotate. The circulating current 10c flows in a manner of circulating through the first split conductor 711a, the second split conductor 711b, the integral conductor 721 located outside the motor radial direction RD, and the integral conductor 721 located inside the motor radial direction RD. For example, since the magnetic flux from the rotors 300a and 300b is linked to the split conductor 711, a radial current flowing in the motor radial direction RD is generated in the split conductor 711. When the rotors 300a and 300b rotate, a phase difference is generated in the plurality of split conductors 711 in the phase where the magnetic flux from the rotors 300a and 300b is linked to the split conductor 711.

[0213] For example, a phase difference occurs between the radial current generated in the first segmented conductor 711a and the radial current generated in the second segmented conductor 711b. In this case, the radial current generated in the first segmented conductor 711a flows as a circulating current 10c in a faster phase than the radial current generated in the second segmented conductor 711b in a manner of circulating through the first segmented conductor 711a, the second segmented conductor 711b, and the pair of integral conductors 721. In this way, when the circulating current 10c flows in the segmented annular portion 702, there is a concern that the AC copper loss in the segmented annular portion 702 will increase.

[0214] In this regard, in the present embodiment, since the first outer peripheral conductor 755a and the second outer peripheral conductor 755b are arranged in the motor radial direction RD, there is no phase difference between the first path current IC1 generated in the first outer peripheral conductor 755a and the second path current IC2 generated in the second outer peripheral conductor 755b. The first path current IC1 and the second path current IC2 flow in the same direction in the motor radial direction RD, so that the integral conductor 721 of one of the pair of integral conductors 721 is canceled. For example, the first path current IC1 and the second path current IC2 cancel each other in the integral conductor 721 located on the outside of the motor radial direction RD. In this way, it is difficult to generate a circulating current IOc in the split annular portion 702 by crossing the first cross conductor 751a and the second cross conductor 751b. Therefore, the AC copper loss in the split annular portion 702 can be reduced.

[0215] <Fourth embodiment>

[0216] In the third embodiment, a dividing gap 715 is provided between at least two intersecting conductors 751. In contrast, in the fourth embodiment, an insulating portion is provided between at least two intersecting conductors 751. The structure, function, and effect not particularly described in the fourth embodiment are the same as those in the first embodiment. In the fourth embodiment, the description will be centered on the points different from the first embodiment.

[0217] like Fig.23 , Fig.24 As shown, similarly to the above-mentioned second embodiment, the coil cover 222 has a cover base 222a and a cover extension 222b. The cover extension 222b is provided between at least two crossing conductors 751 that cross each other. The cover extension 222b is also provided between two crossing groups adjacent to each other in the winding radial direction γ. In addition, the cover extension 222b can also be provided between the crossing group and the split conductor 711.

[0218] The cover extension 222b is, for example, provided between the first cross conductor 751a and the second cross conductor 751b. The cover extension 222b is located between the first outer conductor 755a and the second inner conductor 756b. In addition, the cover extension 222b is located between the first inner conductor 756a and the second outer conductor 755b. Furthermore, the cover extension 222b is located between the first oblique conductor 757a and the second oblique conductor 757b.

[0219] <Fifth embodiment>

[0220] In the first embodiment, the conductivity of the coil annular portion 701 is different depending on the presence or absence of the dividing gap 715. In contrast, in the fifth embodiment, the conductivity of the coil annular portion 701 is different due to the volume density of the annular conductor 701a. 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.

[0221] like Fig.25 As shown, the plurality of coil annular portions 701 include a mixed annular portion 762 and a uniform annular portion 763. In the mixed annular portion 762, the volume density of at least a portion of the annular conductor 701a is set low. For example, in the mixed annular portion 762, the volume density of the annular conductor 701a is not uniform. Volume density [kg / m 3 ] is the mass per unit volume. In the uniform annular portion 763, the volume density of the annular conductor 701a is set high. For example, in the uniform annular portion 763, the volume density of the annular conductor 701a is uniform.

[0222] In the coil portion 215 of the present embodiment, a mixed annular portion 762 is provided instead of the split annular portion 702 of the first embodiment. In addition, a uniform annular portion 763 is provided instead of the integrated annular portion 703 of the first embodiment. For example, the mixed annular portion 762 is provided in the lead-out region Aa and the connection region Ab, and the uniform annular portion 763 is provided in the intermediate region Ac.

[0223] like Figure 26 to Figure 28 As shown, the mixed annular portion 762 includes a first density portion 770 and a second density portion 780. The first density portion 770 includes a first density conductor 771 in addition to the annular cover 701b. The first density conductor 771 extends along the winding circumferential direction β. In the first density portion 770, one first density conductor 771 is formed because the annular conductor 701a is not divided into a plurality of parts.

[0224] The second density portion 780 includes a second density conductor 781 in addition to the annular cover 701b. The second density conductor 781 extends in the winding circumferential direction β. In the second density portion 780, the annular conductor 701a is not divided into a plurality of parts, so that one second density conductor 781 is formed.

[0225] In the coil portion 215 of this embodiment, a first density portion 770 is provided instead of the conductor dividing portion 710 of the first embodiment. In addition, a second density portion 780 is provided instead of the conductor integral portion 720 of the first embodiment. Fig.26 As shown, in the mixing annular portion 762, the second density portion 780 is provided on the outer wall side peripheral portion 731 and the shaft side peripheral portion 732, and the second density portion 780 is provided on the opposite peripheral portion 733. Fig.29 As shown, in the uniform annular portion 763 , the second density portion 780 extends annularly along the winding circumferential direction β.

[0226] exist Fig. 27 , Fig.28 , the first density D1a of the first density conductor 771 is less than the second density D2a of the second density conductor 781. The first density D1a is the volume density of the first density conductor 771. The second density D2a is the volume density of the second density conductor 781. There are a plurality of tiny gaps between the first density conductor 771 and the second density conductor 781. In the first density conductor 771, the tiny gaps are larger and more numerous than the tiny gaps in the second density conductor 781, so the first density D1a is less than the second density D2a.

[0227] The first conductor OC1a of the first density portion 770 is smaller than the second conductor OC2a of the second density portion 780. The first conductor OC1a is a value corresponding to the first density D1a. The smaller the first density D1a is, the smaller the first conductor OC1a is. The second conductor OC2a is a value corresponding to the second density D2a. The larger the second density D2a is, the larger the second conductor OC2a is. Therefore, the first density D1a is smaller than the second density D2a, so that the first conductor OC1a is smaller than the second conductor OC2a.

[0228] The first conductivity ratio OC1a is the ratio of the first density conductor 771 in the cross section of the first density portion 770. For example, the first conductivity ratio OC1a is the ratio of the cross-sectional area SC1a of the first density conductor 771 to the cross-sectional area SW1a of the first density portion 770. The cross-sectional area SW1a includes the cross-sectional area of ​​the coil cover 222 and the actual cross-sectional area of ​​the first density conductor 771. The actual cross-sectional area of ​​the first density conductor 771 is a value corresponding to the first density D1a. For example, the smaller the first density D1a is relative to the cross-sectional area of ​​the first density conductor 771, the smaller the actual cross-sectional area of ​​the first density conductor 771 is. That is, in the first density conductor 771, the actual cross-sectional area is small relative to the cross-sectional area due to the large and numerous micro gaps. That is, in the first density conductor 771, since the first density D1a is small, the first conductivity ratio OC1a is small.

[0229] The second conductivity ratio OC2a is the ratio of the second density conductor 781 in the cross section of the second density portion 780. For example, the second conductivity ratio OC2a is the ratio of the cross-sectional area SC2a of the second density conductor 781 to the cross-sectional area SW2a of the second density portion 780. The cross-sectional area SW2a includes the cross-sectional area of ​​the coil cover 222 and the actual cross-sectional area of ​​the second density conductor 781. The actual cross-sectional area of ​​the second density conductor 781 is a value corresponding to the second density D2a. For example, the larger the second density D2a is relative to the cross-sectional area of ​​the second density conductor 781, the larger the actual cross-sectional area of ​​the second density conductor 781. That is, in the second density conductor 781, the actual cross-sectional area is large relative to the cross-sectional area due to the small and few micro gaps. That is, in the second density conductor 781, the second conductivity ratio OC2a is large due to the large second density D2a.

[0230] For example, the cross-sectional areas SW1a and SW2a are the same in the first density portion 770 and the second density portion 780. On the other hand, since the first density D1a is smaller than the second density D2a, the first conductivity OC1a is smaller than the second conductivity OC2a. In addition, the first density portion 770 corresponds to the first occupying portion, and the second density portion 780 corresponds to the second occupying portion.

[0231] Similar to the first embodiment, in the coil portion 215, an eddy current Ie is generated in the coil conductor 221. Fig. 27 As shown, when an eddy current Ie is generated in the first density portion 770, the eddy current Ie flows along the cross section of the first density conductor 771. In the first density portion 770, the eddy current Ie may be increased due to the large cross-sectional area of ​​the first density conductor 771.

[0232] In this regard, according to the present embodiment, the first conductor ratio OC1a is smaller than the second conductor ratio OC2a in the coil portion 215. In this structure, since the proportion of the coil conductor 221 in the first density portion 770 is low, the eddy current Ie flowing along the cross section of the coil conductor 221 is easily reduced. Therefore, the increase in AC copper loss caused by the increase in the eddy current Ie can be suppressed by the first density portion 770.

[0233] Furthermore, since the proportion of the coil conductor 221 in the second density portion 780 is high, the heat transfer in the second density portion 780 is easier than that in the first density portion 770. That is, the heat dissipation effect of the second density portion 780 is higher than that of the first density portion 770. Therefore, the second density portion 780 can suppress the accumulation of heat in the coil portion 215. In this way, the heat dissipation effect of the coil portion 215 can be improved by the second density portion 780.

[0234] When there are minute gaps in the coil conductor 221, since gas such as air exists in the minute gaps, it is difficult for the eddy current Ie to flow in the minute gaps of the coil conductor 221. Therefore, in the coil conductor 221, since the minute gaps are large and numerous, the eddy current Ie is reduced.

[0235] Therefore, according to the present embodiment, in the coil portion 215, the first density D1a is smaller than the second density D2a. In this structure, in the first density portion 770, compared with the second density portion 780, the eddy current Ie becomes difficult to flow due to the large and numerous small gaps. Therefore, even if the eddy current Ie is generated in the first density portion 770, the eddy current Ie is blocked by the small gaps and is difficult to increase. Therefore, the first density portion 770 can suppress the increase of the AC copper loss and the eddy current loss due to the increase of the eddy current Ie.

[0236] In addition, in the first density portion 770, even if the first density D1a is small, the overall shape of the coil conductor 221 is maintained in a plate shape. Therefore, in the first density portion 770, the cross-section of the coil conductor 221 is enlarged, and the resistance of the coil conductor 221 is unlikely to increase. Therefore, even in the first density portion 770, the increase in DC copper loss can be reduced.

[0237] <Sixth embodiment>

[0238] In the first embodiment, the channel conductor thickness TC1 is uniform in the plurality of coil annular portions 701. In contrast, in the sixth embodiment, the channel conductor thickness TC1 is non-uniform in the plurality of coil annular portions 701. 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 that are different from the first embodiment.

[0239] In the coil unit 219, the channel conductor thickness TC1 is not uniform between the first coil portion 215a and the second coil portion 215b. Fig.30 As shown, in the coil unit 219, the first lead conductor thickness TCa1 in the first lead area Aa1 is less than the second lead conductor thickness TCa2 in the second lead area Aa2. That is, the relationship TCa1<TCa2 holds. The first lead conductor thickness TCa1 is the thickness dimension of the ring conductor 701a in the first lead area Aa1. The second lead conductor thickness TCa2 is the thickness dimension of the ring conductor 701a in the second lead area Aa2. The first lead conductor thickness TCa1 and the second lead conductor thickness TCa2 are the channel conductor thickness TC1.

[0240] In the coil unit 219, the cross-sectional area of ​​the loop conductor 701a is uneven at the first coil portion 215a and the second coil portion 215b. In the coil unit 219, the first lead cross-sectional area Sa1 in the first lead area Aa1 is smaller than the second lead cross-sectional area Sa2 in the second lead area Aa2. That is, the relationship Sa1<Sa2 holds. In the coil unit 219, the relationship TCa1<TCa2 holds, so that the relationship Sa1<Sa2 holds. The first lead cross-sectional area Sa1 is the cross-sectional area of ​​the loop conductor 701a in the first lead area Aa1. The second lead cross-sectional area Sa2 is the cross-sectional area of ​​the loop conductor 701a in the second lead area Aa2.

[0241] In the coil unit 219, the pitch of the loop conductor 701a is uniform in the first coil portion 215a and the second coil portion 215b. For example, the first lead pitch Pa1 and the second lead pitch Pa2 are the same. That is, the relationship of Pa1=Pa2 holds.

[0242] On the other hand, the thickness of the annular cover 701b is uneven at the first coil portion 215a and the second coil portion 215b. For example, similar to the first embodiment, the first lead cover thickness TIa1 is greater than the second lead cover thickness TIa2. In the coil unit 219, the relationship of TCa1<TCa2 is established, and the relationship of Pa1=Pa2 is established, so that the relationship of TIa1>TIb1 is established.

[0243] In this embodiment, as in the first embodiment, the first lead cover thickness TIa1 is greater than the second lead cover thickness TIa2. Therefore, as in the first embodiment, the electrical insulation can be improved in the first coil portion 215a, and the occupancy rate can be improved in the second coil portion 215b.

[0244] As long as the relationship TCa1<TCa2 holds, in the first coil portion 215a, the channel conductor thickness TC1 may be uniform or non-uniform. For example, the first connection conductor thickness TCb1 in the first connection area Ab1 may be the same as the first lead conductor thickness TCa1, or may be greater than the first lead conductor thickness TCa1. The first connection conductor thickness TCb1 is the thickness dimension of the ring conductor 701a in the first connection area Ab1. The first connection conductor thickness TCb1 is the channel conductor thickness TC1.

[0245] As long as the relationship TCa1<TCa2 holds, in the second coil portion 215b, the channel conductor thickness TC1 may be uniform or non-uniform. For example, the second connection conductor thickness TCb2 in the second connection area Ab2 may be the same as the second lead conductor thickness TCa2, or may be greater than the second lead conductor thickness TCa2. The second connection conductor thickness TCb2 is the thickness dimension of the ring conductor 701a in the second connection area Ab2. The second connection conductor thickness TCb2 is the channel conductor thickness TC1.

[0246] <Other embodiments>

[0247] The invention in this specification is not limited to the illustrated embodiments. The invention includes the illustrated embodiments and the changes that those skilled in the art should make based on them. For example, the invention is not limited to the combination of parts and elements shown in the embodiments, but can be implemented in various deformations. The invention can be implemented through various combinations. The invention can include additional parts that can be added to the embodiments. The invention includes a method in which parts and elements of the embodiments are omitted. The invention includes the replacement or combination of parts and elements between one embodiment and other embodiments. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is represented by the description of the scope of the patent claims, and should be interpreted as including all changes within the description of the scope of the patent claims and the equivalent meaning and scope.

[0248] In the above-mentioned embodiments, the conductor arrangement portion such as the conductor dividing portion 710 and the first occupying portion such as the first density portion 770 can be set at any position of the coil portion 215. For example, in the above-mentioned first embodiment, the conductor dividing portion 710 can be set at any position of the outer wall side peripheral portion 731, the shaft side peripheral portion 732 and the relative peripheral portion 733 in the coil annular portion 701. For example, the conductor dividing portion 710 can be set in each of the outer wall side peripheral portion 731, the shaft side peripheral portion 732 and the relative peripheral portion 733 to extend in a ring shape along the winding circumferential direction β. In addition, the conductor dividing portion 710 can also be set only at the outer wall side peripheral portion 731. For the first density portion 770 of the above-mentioned fifth embodiment, it can also be set at any position of the coil annular portion 701 in the same way as the conductor dividing portion 710.

[0249] In addition, in the first embodiment, the conductor dividing portion 710 can be provided in any coil annular portion 701 of the plurality of coil annular portions 701 included in the coil portion 215. For example, the conductor dividing portion 710 can be provided in all coil annular portions 701. In addition, the conductor dividing portion 710 can be provided only in the lead-out annular portion 705 and the connecting annular portion 706 of the plurality of coil annular portions 701. As for the first density portion 770 of the fifth embodiment, it can also be provided in any coil annular portion 701 of the plurality of coil annular portions 701, similarly to the conductor dividing portion 710.

[0250] In the above-mentioned embodiments, at least one of the conductor segmentation portion 710, the conductor integrated portion 720, the first density portion 770, and the second density portion 780 may be provided in the coil portion 215. For example, the plurality of coil annular portions 701 may include both the segmentation annular portion 702 and the mixed annular portion 762. In addition, in the coil annular portion 701, the conductor segmentation portion 710 and the first density portion 770 may be arranged in the winding circumferential direction β.

[0251] In the above-mentioned embodiments, the shape and size of the coil wire 220 can be arbitrary. For example, in the above-mentioned first embodiment, in the coil portion 215, the spacing of the annular conductor 701a can be uniform. In addition, in the coil portion 215, the thickness of the annular cover 701b can be uniform. Moreover, in the coil portion 215, the coil annular portion 701 can be changed at any position of the winding circumferential direction β.

[0252] In the above-mentioned embodiments, the housing may be shared by the motor device 60 and the inverter device 80. For example, the shared housing may house both the motor 61 and the inverter 81. The motor device 60 and the inverter device 80 may not be integrated. For example, the motor housing 70 and the inverter housing 90 may not be integrated.

[0253] 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 a single EPU 50.

[0254] In each of the above embodiments, the eVTOL 10 may not be a tilt-rotor aircraft. For example, in the eVTOL 10, the plurality of propellers 20 may include a propeller 20 for ascent and a propeller 20 for cruising. In the eVTOL 10, for example, when ascending, the propeller 20 for ascent is driven, and when moving forward, the propeller 20 for cruising is driven.

[0255] In the above embodiments, the flying object equipped with the EPU 50 can be electric and may not be a vertical take-off and landing machine. For example, the flying object may be an electric aircraft or a flying object that can take off and land while gliding. Furthermore, 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.

[0256] In each of the above 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, a construction machine, etc., the rotating body is a wheel for movement, etc., and the output shaft is an axle, etc. When the mobile body is a ship, the rotating body is a screw propeller for propulsion, etc., and the output shaft is a propeller shaft, etc.

[0257] (Disclosure of technical ideas)

[0258] This specification discloses multiple technical ideas recorded in the following multiple items. Multiple items may be recorded in a multiple dependent form that selectively refers to a previous item in a subsequent item. Moreover, multiple items may be recorded in a multiple dependent form that refers to another multiple dependent form. These items recorded in multiple dependent forms define multiple technical ideas.

[0259] (Technical Thought 1)

[0260] A rotating electric machine is driven by supply of electric power, the rotating electric machine (60) comprising:

[0261] a rotor (300a, 300b) that rotates around a rotation axis (Cm); and

[0262] A stator (200) having a coil portion (215) formed by winding a plate-shaped coil wire (220) in a stacked manner in an axial direction (AD) of the rotation axis, wherein the stator and the rotor are arranged along the rotation axis.

[0263] The coil portion has a conductor arrangement portion (710) formed by dividing the conductor (221) of the coil wire into a plurality of parts.

[0264] The conductor arrangement portion has:

[0265] Arrangement conductors (711, 751), a plurality of which are arranged in a direction (α, γ) orthogonal to a winding direction (β) of the coil wire; and

[0266] An intervening portion (715, 222b) is provided between two adjacent arrangement conductors to separate the arrangement conductors.

[0267] (Technical Thought 2)

[0268] In the rotating electrical machine described in the technical idea 1,

[0269] The plurality of arrangement conductors include, as two adjacent arrangement conductors, width arrangement conductors (711) arranged in the width direction (γ) of the coil wire.

[0270] (Technical Thought 3)

[0271] In the rotating electrical machine described in the technical idea 1 or 2,

[0272] The coil portion has a radially extending portion (733) and a circumferentially extending portion (731, 732), wherein the radially extending portion is a portion of the coil wire extending in a radial direction (RD) of the rotation axis, and the circumferentially extending portion is a portion of the coil wire extending in a circumferential direction (CD) of the rotation axis.

[0273] The conductor arrangement portion is provided in at least the radially extending portion of the radially extending portion and the circumferentially extending portion.

[0274] (Technical Thought 4)

[0275] In the rotating electrical machine described in Technical Concept 3,

[0276] The coil portion has a conductor integral portion (720), the conductor integral portion and the conductor arrangement portion are arranged in the winding direction, and the conductor of the coil wire of the conductor integral portion is not divided.

[0277] The conductor integral portion is provided at least in the circumferentially extending portion of the radially extending portion and the circumferentially extending portion.

[0278] (Technical Thought 5)

[0279] In the rotating electrical machine described in any one of technical ideas 1 to 4,

[0280] Among the plurality of arrangement conductors, two adjacent arrangement conductors include two crossing conductors (751a, 751b) crossing each other.

[0281] (Technical Thought 6)

[0282] In the rotating electrical machine described in any one of technical ideas 1 to 5,

[0283] The coil portion has a coil annular portion (701) formed by the coil wire and extending annularly in the winding direction, and a plurality of the coil annular portions are arranged in the axial direction.

[0284] The plurality of coil annular portions include an arrangement annular portion (702) having the conductor arrangement portion,

[0285] Among the plurality of coil annular portions, the closest annular portion (705, 706) arranged closest to the rotor in the axial direction is at least the arrangement annular portion.

[0286] (Technical Thought 7)

[0287] In the rotating electrical machine described in Technical Idea 6,

[0288] The plurality of coil annular portions include an integral annular portion (703), which does not have the conductor arrangement portion.

[0289] The integrated annular portion is provided on the opposite side to the rotor across the nearest annular portion.

[0290] (Technical Thought 8)

[0291] In the rotating electrical machine described in any one of technical ideas 1 to 7,

[0292] As the intervening portion, a gap (715) is provided between two adjacent arrangement conductors.

[0293] (Technical Thought 9)

[0294] In the rotating electrical machine described in any one of technical ideas 1 to 8,

[0295] As the intervening portion, an insulating portion (222b) is provided, which has electrical insulation and is provided between two adjacent array conductors.

[0296] (Technical Thought 10)

[0297] A rotating electric machine is driven by supply of electric power, the rotating electric machine (60) comprising:

[0298] a rotor (300a, 300b) that rotates around a rotation axis (Cm); and

[0299] A stator (200) having a coil portion (215) formed by winding a plate-shaped coil wire (220) in a stacked manner in an axial direction (AD) of the rotation axis, wherein the stator and the rotor are arranged along the rotation axis.

[0300] The coil portion has:

[0301] a first occupying portion (710, 770), in which a ratio of the conductor (221) to the cross section of the coil wire is a first conductivity ratio (OC1, OC1a); and

[0302] a second occupying portion (720, 780), the second occupying portion and the first occupying portion are arranged in the winding direction (β) of the coil wire, and the ratio is a second conductivity (OC2, OC2a),

[0303] The first conductivity is smaller than the second conductivity.

[0304] (Technical Thought 11)

[0305] In the rotating electrical machine described in technical idea 10,

[0306] Since the volume density (D1a) of the conductor in the first occupying portion is smaller than the volume density (D2a) of the conductor in the second occupying portion, the first conductivity is smaller than the second conductivity.

[0307] (Technical Thought 12)

[0308] In the rotating electrical machine described in technical idea 10 or 11,

[0309] The coil portion has a radially extending portion (733) and a circumferentially extending portion (731, 732), wherein the radially extending portion is a portion of the coil wire extending in a radial direction (RD) of the rotation axis, and the circumferentially extending portion is a portion of the coil wire extending in a circumferential direction (CD) of the rotation axis.

[0310] The first occupying portion is provided in at least the radially extending portion of the radially extending portion and the circumferentially extending portion.

[0311] The second occupying portion is provided in at least the circumferentially extending portion of the radially extending portion and the circumferentially extending portion.

[0312] (Technical Thought 13)

[0313] In the rotating electrical machine described in any one of technical ideas 1 to 12,

[0314] The coil portion has:

[0315] a channel portion (741) formed by the coil wire, extending in the winding direction in a manner orthogonal to the rotation axis, and provided in plurality in the axial direction; and

[0316] a channel inclined portion (742), which is formed by the coil wire and is inclined in the axial direction relative to the channel portion, connecting two adjacent channel portions in the axial direction,

[0317] The thickness dimension ( TC2 ) of the inclined channel portion is smaller than the thickness dimension ( TC1 ) of the channel portion.

[0318] (Technical Thought 14)

[0319] In the rotating electrical machine described in any one of technical ideas 1 to 13,

[0320] The rotor includes a first rotor (300a) and a second rotor (300b), the second rotor being arranged in the axial direction with the first rotor.

[0321] The coil portion is provided between the first rotor and the second rotor.

[0322] (Technical Thought 15)

[0323] In the rotating electrical machine described in any one of technical ideas 1 to 14,

[0324] A rotary motor is provided on a flying object (10) and is used to drive the flying object to fly.

Claims

1. A rotating electric machine driven by supply of electric power, the rotating electric machine (60) comprising: a rotor (300a, 300b) that rotates around a rotation axis (Cm); and A stator (200) having a coil portion (215) formed by winding a plate-shaped coil wire (220) in a stacked manner in an axial direction (AD) of the rotation axis, wherein the stator and the rotor are arranged along the rotation axis. The coil portion has a conductor arrangement portion (710) formed by dividing the conductor (221) of the coil wire into a plurality of parts. The conductor arrangement portion has: Arrangement conductors (711, 751), a plurality of which are arranged in a direction (α, γ) orthogonal to a winding direction (β) of the coil wire; and An intervening portion (715, 222b) is provided between two adjacent arrangement conductors to separate the arrangement conductors.

2. The rotating electrical machine according to claim 1, characterized in that: The plurality of arrangement conductors include, as two adjacent arrangement conductors, width arrangement conductors (711) arranged in the width direction (γ) of the coil wire.

3. The rotating electrical machine according to claim 1 or 2, characterized in that: The coil portion has a radially extending portion (733) and a circumferentially extending portion (731, 732), wherein the radially extending portion is a portion of the coil wire extending in a radial direction (RD) of the rotation axis, and the circumferentially extending portion is a portion of the coil wire extending in a circumferential direction (CD) of the rotation axis. The conductor arrangement portion is provided in at least the radially extending portion of the radially extending portion and the circumferentially extending portion.

4. The rotating electrical machine according to claim 3, characterized in that: The coil portion has a conductor integral portion (720), the conductor integral portion and the conductor arrangement portion are arranged in the winding direction, and the conductor of the coil wire of the conductor integral portion is not divided. The conductor integral portion is provided at least in the circumferentially extending portion of the radially extending portion and the circumferentially extending portion.

5. The rotating electrical machine according to claim 1 or 2, characterized in that: Among the plurality of arrangement conductors, two adjacent arrangement conductors include two crossing conductors (751a, 751b) crossing each other.

6. The rotating electrical machine according to claim 1 or 2, characterized in that: The coil portion has a coil annular portion (701) formed by the coil wire and extending annularly in the winding direction, and a plurality of the coil annular portions are arranged in the axial direction. The plurality of coil annular portions include an arrangement annular portion (702) having the conductor arrangement portion, Among the plurality of coil annular portions, the closest annular portion (705, 706) arranged closest to the rotor in the axial direction is at least the arrangement annular portion.

7. The rotating electrical machine according to claim 6, characterized in that The plurality of coil annular portions include an integral annular portion (703), which does not have the conductor arrangement portion. The integrated annular portion is provided on the opposite side to the rotor across the nearest annular portion.

8. The rotating electrical machine according to claim 1 or 2, characterized in that: As the intervening portion, a gap (715) is provided between two adjacent arrangement conductors.

9. The rotating electrical machine according to claim 1 or 2, characterized in that: As the intervening portion, an insulating portion (222b) is provided, which has electrical insulation and is provided between two adjacent array conductors.

10. A rotating electric machine driven by supply of electric power, the rotating electric machine (60) comprising: a rotor (300a, 300b) that rotates around a rotation axis (Cm); and A stator (200) having a coil portion (215) formed by winding a plate-shaped coil wire (220) in a stacked manner in an axial direction (AD) of the rotation axis, wherein the stator and the rotor are arranged along the rotation axis. The coil portion has: a first occupying portion (710, 770), in which a ratio of the conductor (221) to the cross section of the coil wire is a first conductivity ratio (OC1, OC1a); and a second occupying portion (720, 780), the second occupying portion and the first occupying portion are arranged in the winding direction (β) of the coil wire, and the ratio is a second conductivity (OC2, OC2a), The first conductivity is smaller than the second conductivity.

11. The rotating electrical machine according to claim 10, characterized in that Since the volume density (D1a) of the conductor in the first occupying portion is smaller than the volume density (D2a) of the conductor in the second occupying portion, the first conductivity is smaller than the second conductivity.

12. The rotating electrical machine according to claim 10 or 11, characterized in that: The coil portion has a radially extending portion (733) and a circumferentially extending portion (731, 732), wherein the radially extending portion is a portion of the coil wire extending in a radial direction (RD) of the rotation axis, and the circumferentially extending portion is a portion of the coil wire extending in a circumferential direction (CD) of the rotation axis. The first occupying portion is provided in at least the radially extending portion of the radially extending portion and the circumferentially extending portion. The second occupying portion is provided in at least the circumferentially extending portion of the radially extending portion and the circumferentially extending portion.

13. The rotating electrical machine according to claim 1 or 10, characterized in that: The coil portion has: a channel portion (741), which is formed by the coil wire and extends along the winding direction in a manner orthogonal to the rotation axis, and a plurality of the channel portions are provided in the axial direction; as well as a channel inclined portion (742), which is formed by the coil wire and is inclined in the axial direction relative to the channel portion, connecting two adjacent channel portions in the axial direction, The thickness dimension ( TC2 ) of the channel inclined portion is smaller than the thickness dimension ( TC1 ) of the channel portion.

14. The rotating electrical machine according to claim 1 or 10, characterized in that: The rotor includes a first rotor (300a) and a second rotor (300b), the second rotor being arranged in the axial direction with the first rotor. The coil portion is provided between the first rotor and the second rotor.

15. The rotating electrical machine according to claim 1 or 10, characterized in that: A rotating electric machine is provided on a flying object (10) and is used to drive the flying object to fly.

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