Rotary electric machine

Abstract

To provide a rotary electric machine capable of suppressing deformation of a rotor.SOLUTION: A motor 61 comprises a stator 200, rotors 300A and 300B and a shaft 340. The rotors 300A and 300B include magnets 310A and 310B and base parts 315A and 315B. The base parts 315A and 315B include holders 320A and 320B and intermediate members 330A and 330B. The holders 320A and 320B hold the magnets 310A and 310B. The intermediate members 330A and 330B are fixed to a shaft axis part 340 by nuts 345A and 345B and a shaft flange 342. The first nut 345A and the second nut 345B are in a state where they hold the intermediate members 330A and 330B in an axial direction AD therebetween.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The disclosure in this specification relates to rotating electrical machines. [Background technology]

[0002] Patent Document 1 describes an axial gap motor. In this motor, a rotor and a stator are aligned in the axial direction. In this motor, the rotor is fixed to a rotating shaft. The rotor extends from the rotating shaft toward the outer periphery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-36519 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned Patent Document 1, since the rotor extends from the rotary shaft toward the outer periphery, there is a concern that the rotor may be deformed due to the attractive force between the rotor and the stator.

[0005] An object of the present disclosure is to provide a rotating electric machine capable of suppressing deformation of the rotor. [Means for solving the problem]

[0006] The multiple aspects disclosed in this specification employ different technical means to achieve their respective objectives. Furthermore, the reference symbols in parentheses in the claims and this section are merely examples showing the correspondence between specific means described in the embodiments below as one aspect, and do not limit the technical scope.

[0007] In order to achieve the above object, the disclosed embodiment comprises: A rotating electric machine (60) driven by a supply of electric power, a stator (200) having a coil portion (211); a rotating shaft portion (341) that rotates around a rotation axis (Cm); a first rotor (300A) that has a first magnet (310A) arranged in a coil portion in the axial direction (AD) of the rotation axis, and a first base portion (315A) extending from the first magnet toward the rotation shaft portion in the radial direction (RD) of the rotation axis, and that rotates together with the rotation shaft portion; a second rotor (300B) that has a second magnet (310B) arranged in the axial direction with the first magnet via a coil portion, and a second base portion (315B) that is overlapped with the first base portion in the axial direction and extends radially from the second magnet toward the rotating shaft portion, and that rotates together with the rotating shaft portion; a hook portion (342; 345A) provided on the rotating shaft portion, to which one of the first base portion and the second base portion is hooked from one side in the axial direction; a clamping portion (345A; 345B) that fixes the first base portion and the second base portion to the rotating shaft portion by clamping at least one of the first base portion and the second base portion between the clamping portion and the hook portion in the axial direction; It is a rotating electric machine equipped with the above.

[0008] According to the above aspect, the first base portion and the second base portion are overlapped in the axial direction. In this configuration, stress generated in the first base portion due to the magnetic force of the first magnet and stress generated in the second base portion due to the magnetic force of the second magnet are likely to cancel each other out at the overlapping portion between the first and second base portions. Furthermore, at least one of the first and second base portions is fixed to the rotating shaft portion by being sandwiched between the clamping portion and the hooking portion. Therefore, the entire first base portion or the second base can be fixed to the rotating shaft portion in the circumferential direction of the rotation axis by the clamping portion and the hooking portion. In this configuration, stress generated in the first base portion or the second base portion is likely to be dispersed throughout the entire circumferential direction at the portion where the first and second base portions are fixed to the rotating shaft portion. Therefore, it is possible to prevent stress from concentrating on a portion of the first or second base portion, causing deformation of the first or second rotor. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the configuration of an eVTOL in a first embodiment. [Figure 2] FIG. 2 is a diagram showing the electrical configuration of the propulsion system. [Figure 3] Schematic perspective view of an EPU. [Figure 4] FIG. [Figure 5] FIG. 4 is a perspective view of the rotor and the nut, when the rotor is viewed from the holder recess side. [Figure 6] FIG. 4 is a perspective view of the rotor as viewed from the opposite side to the holder recess. [Figure 7] FIG. 4 is a longitudinal cross-sectional view of the motor around the first fastener. [Figure 8] FIG. 4 is a longitudinal cross-sectional view of the motor around the second fastener. [Figure 9] FIG. 10 is a vertical cross-sectional view of the motor around the first fastener in the second embodiment. [Figure 10] FIG. 11 is a vertical cross-sectional view of the motor around the first fastener in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in the preceding embodiment will be assigned the same reference numerals, and duplicate descriptions may be omitted. In each embodiment, when only a part of the configuration is described, other previously described embodiments may be applied to the other parts of the configuration. In addition to combinations of parts that are specifically specified as being combinable in each embodiment, it is also possible to partially combine embodiments even if not specified, as long as there is no particular problem with the combination.

[0011] First Embodiment The propulsion system 30 shown in FIG. 1 is mounted on an eVTOL 10. The eVTOL 10 is an electric vertical take-off and landing aircraft, and is capable of taking off and landing vertically. eVTOL is an abbreviation for electric Vertical Take-Off and Landing aircraft. The eVTOL 10 is an aircraft that flies in the atmosphere, and corresponds to an air vehicle. The eVTOL 10 is also an electrically powered electric aircraft, and is sometimes referred to as an electric air vehicle. The eVTOL 10 is a manned aircraft that carries a crew member. The propulsion system 30 is a system that drives the eVTOL 10 to fly.

[0012] The eVTOL 10 has an airframe 11 and a propeller 20. The airframe 11 has an airframe main body 12 and wings 13. The airframe main body 12 is the fuselage of the airframe 11 and has a shape that extends, for example, in the front-to-rear direction. The airframe main body 12 has a passenger compartment for passengers. The wings 13 extend from the airframe main body 12 and multiple wings 13 are provided on the airframe main body 12. The wings 13 are fixed wings. The multiple wings 13 include main wings, a tail, etc.

[0013] A plurality of propellers 20 are provided on the airframe 11. The eVTOL 10 is a multicopter having at least three propellers 20. For example, at least four propellers 20 are provided on the airframe 11. The propellers 20 are provided on each of the airframe body 12 and the wings 13. The propellers 20 rotate around a propeller axis. The propeller axis is, for example, the center line of the propeller 20. The propellers 20 can generate thrust and lift for the eVTOL 10. The propellers 20 are also sometimes referred to as rotors or rotating blades.

[0014] The propeller 20 has blades 21 and a boss 22. A plurality of the blades 21 are arranged in the circumferential direction of the propeller axis. The boss 22 connects the plurality of blades 21. The blades 21 extend from the boss 22 in the radial direction of the propeller axis. The propeller 20 has a propeller shaft (not shown). The propeller shaft is the rotation axis of the propeller 20 and extends from the boss 22 along the propeller axis.

[0015] The eVTOL 10 is a tilt rotor aircraft. In the eVTOL 10, the tilt angle of the propeller 20 is adjustable. Note that the eVTOL 10 does not have to be a tilt rotor aircraft. For example, the eVTOL 10 may have a propeller 20 for lift and a propeller 20 for cruising.

[0016] The eVTOL 10 has a battery 31, a distributor 32, a flight control device 40, and an EPU 50. The battery 31, the distributor 32, the flight control device 40, and the EPU 50 are included in the propulsion system 30. The battery 31 is connected to the multiple EPUs 50 so that electricity can be conducted thereto. The battery 31 is a power supply unit that supplies power to the EPUs 50, and corresponds 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 chargeable and dischargeable secondary battery. The battery 31 also supplies power to the flight control device 40. Note that a fuel cell, a generator, or the like may be used as the power supply unit in addition to or instead of the battery 31.

[0017] The distributor 32 is electrically connected to the battery 31 and the plurality of EPUs 50. The distributor 32 distributes power from the battery 31 to the plurality of EPUs 50. The power distributed by the distributor 32 to the EPUs 50 is drive power for driving the EPUs 50.

[0018] The flight control device 40 controls the propulsion system 30. The flight control device 40 performs flight control for flying the eVTOL 10. The flight control device 40 is communicatively connected to multiple EPUs 50. The flight control device 40 controls the multiple EPUs 50 individually. The flight control device 40 controls the EPUs 50 via a control circuit 160, which will be described later. The flight control device 40 controls the control circuit 160.

[0019] The EPU 50 is a device that drives the propeller 20 to rotate, and corresponds to a drive device. EPU is an abbreviation for Electric Propulsion Unit. The EPU 50 is sometimes called an electric drive device or an electric drive system. An EPU 50 is provided individually for each of the multiple propellers 20. The EPUs 50 are arranged on the propellers 20 along the propeller axis. All of the multiple EPUs 50 are fixed to the airframe 11. The EPUs 50 support the propellers 20 so that they can rotate. The EPUs 50 are connected to the propellers 20. The propellers 20 are fixed to the airframe 11 via the EPUs 50. When the tilt angle of the propellers 20 is changed, the angle of the EPUs 50 is also changed.

[0020] The eVTOL 10 has a propulsion device 15. The propulsion device 15 is a device for propelling the eVTOL 10. The eVTOL 10 is capable of flight such as lift due to propulsion 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 corresponds to a rotating body. The eVTOL 10 flies due to the rotation of the propeller 20. In other words, the eVTOL 10 moves due to the rotation of the propeller 20. The eVTOL 10 corresponds to a moving body.

[0021] As shown in Figures 1 and 2, the EPU 50 has a motor device 60 and an inverter device 80. The motor device 60 has a motor 61. The motor device 60 corresponds to a rotating electric machine. The inverter device 80 has an inverter 81. The motor 61 is electrically connected to the battery 31 via the inverter 81. The motor 61 is driven in response to power supplied from the battery 31 via the inverter 81.

[0022] The motor 61 is a multi-phase AC motor. The motor 61 is, for example, a three-phase AC motor and has a U phase, a V phase, and a W phase. The motor 61 is a driving source for moving the moving body and functions as an electric motor. For example, a brushless motor is used as the motor 61. The motor 61 functions as a generator during regeneration. The motor 61 has multi-phase coils 64. The coils 64 are windings and form an armature. The coils 64 are provided for each of the U phase, the V phase, and the W phase. In the motor 61, the multi-phase coils 64 are connected to each other at a neutral point 65.

[0023] In FIG. 2, the inverter 81 drives the motor 61 by converting the power supplied to the motor 61. The inverter 81 converts the power supplied to the motor 61 from direct current to alternating current. The inverter 81 is a power conversion unit that converts power. The inverter 81 is a multi-phase power conversion unit that performs power conversion for each of the multiple phases. The inverter 81 is, for example, a three-phase inverter that performs power conversion for each of the U phase, V phase, and W phase. The inverter device 80 is sometimes referred to as a power conversion device.

[0024] 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 the high-potential electrode, and the negative electrode is the low-potential electrode. The P line 141 and the N line 142 are power lines for supplying electric power. The P line 141 is a high-potential power line and may be referred to as a high-potential line. The N line 142 is a low-potential power line and may be referred to as a low-potential line.

[0025] 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 laid across the motor device 60 and the inverter device 80.

[0026] The inverter device 80 has a smoothing capacitor 145. The smoothing capacitor 145 is a capacitor that smoothes the DC voltage supplied from the battery 31. The smoothing capacitor 145 is connected to the P line 141 and the N line 142 between the battery 31 and the inverter 81. The smoothing capacitor 145 is connected in parallel to the inverter 81.

[0027] 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 for a plurality of phases. For example, the inverter 81 has an upper and lower arm circuit 85 for each of the U phase, V phase, and W phase. The upper and lower arm circuit 85 has an upper arm 85a and a lower arm 85b. The upper arm 85a and the lower arm 85b are connected in series to 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.

[0028] The output line 143 is connected to the upper and lower arm circuits 85 for each of the multiple 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 64 for each of the multiple phases. The output line 143 is connected to the side of the coil 64 opposite to the neutral point 65.

[0029] The upper arm 85a and the lower arm 85b have an arm switch 86 and a diode 87. The arm switch 86 is a transistor such as a MOSFET. MOSFET is an abbreviation for Metal-Oxide-Semiconductor Field-Effect Transistor. The arm switch 86 is a switching element that can convert power by switching. The switching element may be a semiconductor element such as a power element. The arm switch 86 is a conversion switch for converting power.

[0030] The EPU 50 has 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 sometimes referred to as a motor control unit. In FIG. 2, the control circuit 160 is illustrated as CC.

[0031] As shown in FIG. 3, 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 provided between the propeller 20 and the inverter device 80 in the axial direction AD. The motor axis Cm is the center line of the motor 61 and is a virtual line that extends linearly. The motor axis Cm corresponds to the rotation axis. The axial direction AD is the direction in which the motor axis Cm extends.

[0032] With respect to the motor axis Cm, the axial direction AD, the circumferential direction CD, and the radial direction RD are perpendicular to one another. The circumferential direction CD is the direction of rotation of the motor 61. With respect to the radial direction RD, the outer side is sometimes referred to as the radially outer side or the outer circumferential side, and the inner side is sometimes referred to as the radially inner side or the inner circumferential side. The axial direction AD is sometimes referred to as the axial direction.

[0033] The EPU 50 has a motor housing 70 and an inverter housing 90. The motor housing 70 is included in the motor device 60. The motor housing 70 houses a motor 61. The inverter housing 90 is included in the inverter device 80. The inverter housing 90 houses an inverter 81. The motor housing 70 and the inverter housing 90 are connected to each other.

[0034] As shown in FIG. 4, the motor housing 70 has a motor outer peripheral wall 71, a rear frame 370, and a drive frame 390. The motor outer peripheral wall 71 and the frames 370, 390 are made of a metal material or the like and have thermal conductivity. The motor outer peripheral wall 71 is cylindrical and extends in the axial direction AD. The frames 370, 390 are plate-shaped and extend in a direction perpendicular to the axial direction AD. The rear frame 370 and the drive frame 390 are arranged in the axial direction AD via the motor outer peripheral wall 71. The frames 370, 390 are fixed to the motor outer peripheral wall 71 with fasteners such as bolts. Note that FIG. 4 shows a longitudinal cross section of the motor device 60 taken along the motor axis Cm.

[0035] The motor housing 70 has motor fins 72. The motor fins 72 are provided on the outer surface of the motor housing 70. For example, the motor fins 72 are provided on the outer surface of the motor outer peripheral wall 71. A plurality of the motor fins 72 are arranged in the circumferential direction CD. The motor fins 72 are heat dissipation fins that dissipate heat from the motor device 60 to the outside.

[0036] The motor 61 has a stator 200, a rotor 300, and a shaft 340. The stator 200 is a stator. The stator 200 has a coil 64. The rotor 300 is a rotor. The rotor 300 rotates relative to the stator 200. The rotor 300 is formed in an annular shape. The rotor 300 rotates around a motor axis Cm. The motor axis Cm is the center line of the rotor 300. The stator 200 extends annularly in the circumferential direction CD. The motor axis Cm coincides with the center line of the stator 200.

[0037] The stator 200 has coil portions 211. A plurality of the coil portions 211 are arranged in the circumferential direction CD along the inner surface of the motor outer peripheral wall 71 of the stator 200. The plurality of coil portions 211 form the coil 64. The coil portions 211 are formed of electric wires such as rectangular wires, and are electrically conductive. The coil portions 211 are formed in a cylindrical shape as a whole, and extend in the axial direction AD.

[0038] The motor 61 is an axial gap motor. In the motor 61, a stator 200 and a rotor 300 are arranged in the axial direction AD with an axial gap 305 interposed therebetween. The motor 61 is a double-rotor motor. The motor 61 has two rotors, a first rotor 300A and a second rotor 300B. The first rotor 300A and the second rotor 300B are arranged in the axial direction AD with the stator 200 interposed therebetween. The motor 61 is sometimes referred to as a double axial motor.

[0039] The shaft 340 supports the rotor 300. The shaft 340 rotates together with the rotor 300 about the motor axis Cm. The center line of the shaft 340 coincides with the motor axis Cm. The shaft 340 connects the rotor 300 and the propeller 20. The shaft 340 is made of a metal material such as titanium.

[0040] The shaft 340 has a shaft shaft portion 341 and a shaft flange 342. The shaft shaft portion 341 is formed in a columnar or cylindrical shape and extends in an axial direction AD along the motor axis Cm. The shaft shaft portion 341 rotates around the motor axis Cm. The shaft shaft portion 341 corresponds to the rotating shaft portion. The shaft flange 342 is a convex portion provided on the shaft outer peripheral surface 341a. The shaft outer peripheral surface 341a is the outer peripheral surface of the shaft shaft portion 341. The shaft flange 342 extends in the circumferential direction CD along the shaft outer peripheral surface 341a. The shaft flange 342 is formed in an annular shape so as to surround the shaft shaft portion 341 from the outer periphery side. The shaft flange 342 corresponds to the outer peripheral convex portion.

[0041] The motor device 60 has a rear bearing 350 and a drive bearing 360. The bearings 350, 360 rotatably support the shaft 340. The rear bearing 350 and the drive bearing 360 are aligned in the axial direction AD via the rotor 300. The bearings 350, 360 are fixed to the motor housing 70. The rear bearing 350 is fixed to a rear frame 370. The drive bearing 360 is fixed to a drive frame 390.

[0042] The rotor 300 has magnets 310 and a base portion 315. A plurality of magnets 310 are arranged in the circumferential direction CD along the outer circumferential edge of the rotor 300. The magnets 310 include at least one permanent magnet and form a field magnet. The magnets 310 are arranged in the axial direction AD with respect to the coil portion 211 via an axial gap 305. The base portion 315 supports the magnets 310. The base portion 315 forms the outer circumferential edge and the inner circumferential edge of the rotor 300. The base portion 315 extends in the radial direction RD from the magnets 310 toward the shaft 340.

[0043] As shown in FIGS. 4 to 6, the base portion 315 has a holder 320 and an intermediate member 330. The holder 320 and the intermediate member 330 are formed in an annular shape extending in the circumferential direction CD. The holder 320 holds the magnet 310. The holder 320 corresponds to a holding member. The holder 320 extends from the magnet 310 toward the shaft 340 in the axial direction AD. The holder 320 forms the outer circumferential end of the base portion 315.

[0044] Holder 320 is made of a resin material or the like. For example, holder 320 is made of CFRP or the like. CFRP is carbon fiber reinforced plastic. The density of holder 320 is lower than the density of shaft 340. Density is mass per unit volume. In terms of mass per unit volume, holder 320 is lighter than shaft 340. The density of the material that forms holder 320 is lower than the density of the material that forms shaft 340.

[0045] The holder 320 has a holder outer circumferential portion 321, a holder inner circumferential portion 322, and a holder body portion 323. The holder outer circumferential portion 321, the holder inner circumferential portion 322, and the holder body portion 323 are formed in an annular shape extending in the circumferential direction CD. The holder outer circumferential portion 321 forms the outer circumferential end of the holder 320. The holder outer circumferential portion 321 holds the magnet 310. At least a portion of the magnet 310 is embedded in the holder outer circumferential portion 321. The magnet 310 is provided on the holder outer circumferential portion 321 on the coil portion 211 side in the axial direction AD.

[0046] The holder inner peripheral portion 322 forms the inner peripheral end of the holder 320. The holder body portion 323 is provided between the holder outer peripheral portion 321 and the holder inner peripheral portion 322 in the radial direction RD. The holder body portion 323 connects the holder outer peripheral portion 321 and the holder inner peripheral portion 322. The holder outer peripheral portion 321 extends radially outward from the holder body portion 323. The holder inner peripheral portion 322 extends radially inward from the holder body portion 323. In addition, the holder body portion 323 extends from the holder outer peripheral portion 321 toward the coil portion 211 in the axial direction AD.

[0047] A holder recess 324 is formed in the holder 320. The holder recess 324 is recessed toward the coil portion 211 in the axial direction AD. The holder recess 324 is provided on the inner peripheral side of the holder body portion 323. The bottom of the holder recess 324 is formed by the holder inner peripheral portion 322. A holder through hole 325 is formed in the holder inner peripheral portion 322. The holder through hole 325 penetrates the holder inner peripheral portion 322 in the axial direction AD. A shaft 340 is inserted through the holder through hole 325.

[0048] The holder 320 has a holder chamber 326. A plurality of the holder chambers 326 are arranged in the circumferential direction CD and the axial direction AD. For example, a plurality of the holder chambers 326 are arranged along the outer circumferential edge of the holder 320. The holder chamber 326 is partitioned by a plurality of partition walls. The plurality of partition walls include partition walls extending in a direction perpendicular to the circumferential direction CD, partition walls extending in a direction perpendicular to the axial direction AD, and partition walls extending in a direction perpendicular to the radial direction RD. The interior of the holder chamber 326 may be a housing portion that houses a resin member or the like, or may be a space that houses air or the like. In the holder 320, even if the interior of the holder chamber 326 is a space, the strength of the holder 320 is ensured by the partition walls or the like.

[0049] The holder 320 has a sandwich structure. The sandwich structure is included in at least the holder outer circumferential portion 321 and the holder body portion 323. In the sandwich structure, a pair of partition walls extending in a direction perpendicular to the axial direction AD and aligned in the axial direction AD are connected by a plurality of partition walls extending in directions perpendicular to the circumferential direction CD and the radial direction RD.

[0050] The inner wall surface of the holder recess 324 is tapered. The inner wall surface of the holder recess 324 is inclined with respect to the axial direction AD so as to face the opening side of the holder recess 324. The tapered inner wall surface of the holder recess 324 in the holder 320 reduces the volume of the holder 320 and the sandwich structure. The holder 320 is formed by stacking multiple resin plate-shaped base materials extending in a direction perpendicular to the axial direction AD in the axial direction AD. In the manufacturing process for the holder 320, pressure is applied in a direction that causes the multiple plate-shaped base materials to adhere to each other, thereby joining or adhering the multiple plate-shaped base materials to produce the holder 320. When multiple plate-shaped base materials are pressurized, the tapered portion forming the inner wall surface of the holder recess 324 tends to increase the pressure applied to the multiple plate-shaped base materials due to a wedge effect or the like. This tends to improve the adhesive strength that bonds the multiple plate-shaped base materials together.

[0051] The intermediate member 330 is made of a metal material or the like. The density of the intermediate member 330 is greater than the density of the holder 320. In terms of mass per unit volume, the intermediate member 330 is heavier than the holder 320. The density of the material forming the intermediate member 330 is greater than the density of the material forming the holder 320. The strength and rigidity of the intermediate member 330 are greater than the strength and rigidity of the holder 320. The strength of the intermediate member 330 and the holder 320 indicates mechanical strength.

[0052] The intermediate member 330 supports the holder 320 while being fixed to the shaft 340. The intermediate member 330 forms the inner peripheral end of the base portion 315. The inner peripheral surface of the intermediate member 330 is overlapped with the shaft outer peripheral surface 341a. The intermediate member 330 is fitted onto the shaft shaft portion 341. The intermediate member 330 is connected to the holder 320. The intermediate member 330 corresponds to a fixed member.

[0053] The inner peripheral surface of the intermediate member 330 may be formed with longitudinal grooves extending in the axial direction AD. A plurality of the longitudinal grooves are arranged in the circumferential direction CD. Both ends of the longitudinal grooves are open in the axial direction AD. The longitudinal grooves can prevent the frictional force between the inner peripheral surface of the intermediate member 330 and the shaft outer peripheral surface 341a from becoming excessively large.

[0054] The intermediate member 330 has an intermediate outer peripheral portion 331 and an intermediate inner peripheral portion 332. The intermediate outer peripheral portion 331 and the intermediate inner peripheral portion 332 are formed in an annular shape so as to extend in the circumferential direction CD. The intermediate outer peripheral portion 331 forms the outer peripheral end of the intermediate member 330. The intermediate outer peripheral portion 331 is fixed to the holder inner peripheral portion 322. The intermediate outer peripheral portion 331 extends radially outward from the intermediate inner peripheral portion 332. The intermediate inner peripheral portion 332 forms the inner peripheral end of the intermediate member 330. The intermediate inner peripheral portion 332 is fixed to the shaft 340. The intermediate inner peripheral portion 332 extends from the intermediate outer peripheral portion 331 in the axial direction AD.

[0055] An intermediate through hole 333 is formed in the intermediate member 330. The intermediate through hole 333 penetrates the intermediate inner peripheral portion 332 in the axial direction AD. A shaft 340 is inserted through the intermediate through hole 333.

[0056] The intermediate member 330 is accommodated in the holder recess 324. Inside the holder recess 324, a portion of the intermediate member 330 overlaps a portion of the holder 320 from the holder recess 324 side in the axial direction AD. For example, the intermediate inner peripheral portion 332 and the holder outer peripheral portion 321 overlap in the axial direction AD. Furthermore, the intermediate inner peripheral portion 332 overlaps the holder outer peripheral portion 321 from the shaft flange 342 side. In the radial direction RD, the intermediate member 330 protrudes further toward the shaft 340 than the holder 320. In the axial direction AD, the intermediate member 330 does not protrude from the holder recess 324. The intermediate member 330 is provided at a position away from the holder body portion 323 toward the shaft shaft portion 341. In the intermediate member 330, the intermediate inner peripheral portion 332 does not reach the holder body portion 323.

[0057] As shown in FIGS. 5 to 8 , the holder 320 and the intermediate member 330 are connected to each other at the base portion 315 by fasteners 336 and the like. The fasteners 336 correspond to connectors. The fasteners 336 are formed to include bolt members, nut members, engagement pins, and the like. The fasteners 336 are included in the base portion 315. The fasteners 336 fix the holder 320 and the intermediate member 330 together in a state where they penetrate a portion where a part of the holder 320 and a part of the intermediate member 330 overlap in the axial direction AD. A plurality of the fasteners 336 are arranged in the circumferential direction CD. The holder 320 and the intermediate member 330 are fixed to each other by the fasteners 336 at a plurality of positions in the circumferential direction CD.

[0058] In the base portion 315, the holder inner peripheral portion 322 and the intermediate outer peripheral portion 331 are overlapped in the axial direction AD. The fasteners 336 are inserted through the holder fastening holes 327 and the intermediate fastening holes 334 to fasten the holder inner peripheral portion 322 and the intermediate outer peripheral portion 331 together. The holder fastening holes 327 are holes that pass through the holder inner peripheral portion 322 in the axial direction AD. The intermediate fastening holes 334 are holes that pass through the intermediate outer peripheral portion 331 in the axial direction AD. The holder fastening holes 327 and the intermediate fastening holes 334 are aligned in the axial direction AD. A plurality of the fastening holes 327, 334 are aligned in the circumferential direction CD.

[0059] A holder relief hole 328 is formed in the holder 320. The holder relief hole 328 is a hole that penetrates the holder outer peripheral portion 321 in the axial direction AD. A middle relief hole 335 is formed in the intermediate member 330. The middle relief hole 335 is a hole that penetrates the middle inner peripheral portion 332 in the axial direction AD. The holder relief hole 328 and the middle relief hole 335 are aligned in the axial direction AD. A plurality of the relief holes 328, 335 are aligned in the circumferential direction CD. For example, the fastening holes 327, 334 and the relief holes 328, 335 are aligned alternately one by one in the circumferential direction CD.

[0060] 7 and 8, the fastener 336 includes a fastening protrusion 337. The fastening protrusion 337 is a portion of the fastener 336 that protrudes through the holder inner peripheral portion 322 to the opposite side of the intermediate outer peripheral portion 331. In the motor 61, the fastening protrusion 337 of one of the first rotor 300A and the second rotor 300B is inserted into the relief holes 328, 335 of the other.

[0061] As shown in FIG. 6, the holder 320 is provided with a positioning portion 329. For example, the positioning portion 329 is provided on the plate surface of the holder inner peripheral portion 322 opposite to the intermediate outer peripheral portion 331. The positioning portion 329 is a convex portion, a concave portion, a hole, a notch, or the like. For example, the positioning portion 329 of one of the first rotor 300A and the second rotor 300B is a convex portion, and the positioning portion 329 of the other is a concave portion. In the motor 61, the positioning portion 329 of one of the first rotor 300A and the second rotor 300B is inserted into the other, second rotor 300B, thereby determining the position of the second rotor 300B in the circumferential direction CD relative to the first rotor 300A.

[0062] The motor 61 has a nut 345. The nut 345 is made of a metal material or the like. The nut 345 is formed to include a nut member. The nut 345 is formed in an annular shape extending in the circumferential direction CD. The nut 345 is attached to the shaft shaft portion 341 to fix the rotor 300 to the shaft 340. The nut 345 is threadedly engaged with the shaft shaft portion 341. The nut 345 corresponds to a threaded member. For example, a female thread portion 346 of the nut 345 is threadedly engaged with a male thread portion 343 of the shaft shaft portion 341. The female thread portion 346 is formed on an inner peripheral surface of the nut 345. The male thread portion 343 is formed on an outer circumferential shaft surface 341a.

[0063] As shown in FIGS. 7 and 8 , the nut 345 is arranged in the axial direction AD on at least a portion of the intermediate member 330. For example, the nut 345 is arranged in the axial direction AD on the intermediate inner circumferential portion 332. The nut 345 can press the intermediate inner circumferential portion 332 in the axial direction AD when threaded onto the shaft shank 341. The nut 345 can fix the rotor 300 to the shaft 340 by pressing the intermediate inner circumferential portion 332 in the axial direction AD. The nut 345 corresponds to a pressing member. The nut 345 is hooked onto the rotor 300 from one side in the axial direction AD, thereby restricting movement of the rotor 300 in the axial direction AD relative to the shaft 340. For example, the nut 345 is hooked onto the intermediate inner circumferential portion 332 from the opposite side of the intermediate inner circumferential portion 332 via the intermediate outer circumferential portion 331 in the axial direction AD.

[0064] The first rotor 300A and the second rotor 300B have corresponding members and parts. As shown in Figures 7 and 8, the members and parts of the first rotor 300A are designated by adding "1" to the names of the members and parts of the rotor 300 and adding "A" to the reference numerals. For example, the first rotor 300A has a first magnet 310A, a first base portion 315A, a first holder 320A, a first holder recess 324A, a first holder fastening hole 327A, and a first holder relief hole 328A. The first holder 320A has a first holder outer circumferential portion 321A, a first holder inner circumferential portion 322A, a first holder body portion 323A, and a first holder recess 324A. The first rotor 300A also has a first intermediate member 330A, a first intermediate fastening hole 334A, a first intermediate relief hole 335A, a first fastener 336A, and a first fastening protrusion 337A. The first intermediate member 330A has a first intermediate outer peripheral portion 331A and a first intermediate inner peripheral portion 332A. The nut 345 that secures the first rotor 300A is a first nut 345A.

[0065] In the first rotor 300A, the first holder 320A corresponds to the first holding member, and the first intermediate member 330A corresponds to the first fixing member. The first holder recess 324A corresponds to the first recess, the first fastener 336A corresponds to the first connector, the first fastening protrusion 337a corresponds to the first protrusion, and the first holder relief hole 328a corresponds to the first accommodating portion. The first nut 345A corresponds to the first pressing member.

[0066] The members and parts of the second rotor 300B have the "2" added to the names of the members and parts of the rotor 300 and the "B" added to the reference numerals. For example, the second rotor 300B has a second magnet 310B, a second base portion 315B, a second holder 320B, a second holder recess 324B, a second holder fastening hole 327B, and a second holder relief hole 328B. The second holder 320B has a second holder outer circumferential portion 321B, a second holder inner circumferential portion 322B, a second holder body portion 323B, and a second holder recess 324B. The second rotor 300B also has a second intermediate member 330B, a second intermediate fastening hole 334B, a second intermediate relief hole 335B, a second fastener 336B, and a second fastening protrusion 337b. The second intermediate member 330B has a second intermediate outer peripheral portion 331 B and a second intermediate inner peripheral portion 332 B. The nut 345 that fixes the second rotor 300B is a second nut 345B.

[0067] In the second rotor 300B, the second holder 320B corresponds to the second holding member, and the second intermediate member 330B corresponds to the second fixing member. The second holder recess 324B corresponds to the second recess, the second fastener 336B corresponds to the second connector, the second fastening protrusion 337B corresponds to the second protrusion, and the second holder relief hole 328B corresponds to the second accommodating portion. The second nut 345B corresponds to the second pressing member.

[0068] The first rotor 300A and the second rotor 300B are stacked in the axial direction AD. The first rotor 300A and the second rotor 300B are arranged such that the first holder inner circumferential portion 322A and the second holder inner circumferential portion 322B overlap each other. The first holder recess 324A is open toward the opposite side from the second holder 320B. The second holder recess 324B is open toward the opposite side from the first holder 320A.

[0069] A holder overlapping portion 301 is included at the boundary between the first rotor 300A and the second rotor 300B. In the holder overlapping portion 301, a portion of the first rotor 300A and a portion of the second rotor 300B overlap each other. In the holder overlapping portion 301, a first holder inner circumferential portion 322A and a second holder inner circumferential portion 322B overlap each other. In the holder overlapping portion 301, a first holder body portion 323A and a second holder body portion 323B overlap each other. The holder overlapping portion 301 corresponds to a holding overlapping portion. The first holder outer circumferential portion 321A and the first magnet 310A, and the second holder outer circumferential portion 321B and the second magnet 310B are aligned in the axial direction AD via the stator 200.

[0070] The holder overlapping portion 301 extends in a direction perpendicular to the axial direction AD. The holder overlapping portion 301 extends annularly in the circumferential direction CD. The holder overlapping portion 301 is provided at a position spaced radially outward from the shaft shaft portion 341. The holder overlapping portion 301 has a overlapping outer peripheral end 301a and a overlapping inner peripheral end 301b. The overlapping outer peripheral end 301a is the outer peripheral end of the holder overlapping portion 301 and extends annularly in the circumferential direction CD. The overlapping outer peripheral end 301a is located at a position spaced radially outward from the shaft shaft portion 341 and the intermediate members 330A, 330B. The overlapping outer peripheral end 301a is included in the boundary between the first holder body portion 323A and the second holder body portion 323B. The overlapping inner peripheral end 301b is the inner peripheral end of the holder overlapping portion 301 and extends annularly in the circumferential direction CD. The overlapping inner peripheral edge 301b is formed by the inner peripheral edge of the holder inner peripheral portion 322. The overlapping inner peripheral edge 301b is included in the boundary between the first holder inner peripheral portion 322A and the second holder inner peripheral portion 322B.

[0071] The first nut 345A and the second nut 345B sandwich the first rotor 300A and the second rotor 300B in the axial direction AD. The first nut 345A presses the first base portion 315A toward the second base portion 315B in the axial direction AD. The second nut 345B presses the second base portion 315B toward the first base portion 315A in the axial direction AD. The first nut 345A is in contact with the first intermediate inner circumferential portion 332A. The second nut 345B is in contact with the second intermediate inner circumferential portion 332B.

[0072] One of the first nut 345A and the second nut 345B is hooked onto one of the first base portion 315A and the second base portion 315B from one side in the axial direction AD. The other of the first nut 345A and the second nut 345B sandwiches at least one of the first base portion 315A and the second base portion 315B between itself and the other nut. The first base portion 315A and the second base portion 315B are fixed to the shaft shaft portion 341 by being sandwiched between the first nut 345A and the second nut 345B.

[0073] For example, the second nut 345B is hooked onto the second base portion 315B from the opposite side to the first base portion 315A in the axial direction AD. The second nut 345B corresponds to the hooking portion. The first nut 345A is in a state in which the first base portion 315A and the second base portion 315B are sandwiched between the first nut 345A and the second nut 345B. The first nut 345A corresponds to the sandwiching portion.

[0074] In the motor 61, the first nut 345A and the second nut 345B sandwich the base portions 315A and 315B, so that the first intermediate member 330A and the second intermediate member 330B sandwich the first holder 320A and the second holder 320B. For example, the middle outer peripheral portion 331 of the first intermediate member 330A and the middle outer peripheral portion 331 of the second intermediate member 330B sandwich the holder inner peripheral portion 322 of the first holder 320A and the holder inner peripheral portion 322 of the second holder 320B.

[0075] 7, in the first rotor 300A, the first fastening protrusion 337A protrudes from the holder overlapping portion 301 toward the second rotor 300B. In the second rotor 300B, the second holder relief hole 328B and the second intermediate relief hole 335B are provided in positions aligned with the first fastener 336A in the axial direction AD. The first fastening protrusion 337A is in a state of fitting into at least the second holder relief hole 328B of the second holder relief hole 328B and the second intermediate relief hole 335B.

[0076] 8, in the second rotor 300B, the second fastening protrusion 337B protrudes from the holder overlapping portion 301 toward the first rotor 300A. In the first rotor 300A, the first holder relief hole 328A and the first intermediate relief hole 335A are provided at positions aligned with the second fastener 336B in the axial direction AD. The second fastening protrusion 337B is in a state of fitting into at least the first holder relief hole 328A of the first holder relief hole 328A and the first intermediate relief hole 335A.

[0077] 7 and 8, the shaft flange 342 is located between the first rotor 300A and the second rotor 300B in the axial direction AD. For example, the shaft flange 342 is located between the first intermediate member 330A and the second intermediate member 330B in the axial direction AD. The shaft flange 342 is hooked onto at least one of the first intermediate member 330A and the second intermediate member 330B. The shaft flange 342 is hooked onto at least one of the first base portion 315A and the second base portion 315B, thereby positioning the first base portion 315A and the second base portion 315B in the axial direction AD.

[0078] For example, shaft flange 342 is hooked onto first base portion 315A, but is not hooked onto second base portion 315B. In this case, shaft flange 342 corresponds to the hooking portion, and first base portion 315A corresponds to the clamping portion. Second base portion 315B is hooked onto first base portion 315A, but is located away from shaft flange 342 in the axial direction AD. In this case, first base portion 315A corresponds to the hooking portion, and second base portion 315B corresponds to the clamping portion.

[0079] Next, a brief description will be given of a manufacturing method for motor device 60. The manufacturing process for manufacturing motor device 60 includes a preparation step. In the preparation step, a worker prepares motor housing 70, stator 200, shaft 340, holders 320A, 320B, intermediate members 330A, 330B, fasteners 336A, 336B, nuts 345A, 345B, etc. After the preparation step, the worker performs an assembly step.

[0080] In the assembling process, the worker manufactures the first rotor 300A by fastening the first holder 320A and the first intermediate member 330A together with the first fasteners 336A, etc. The worker manufactures the second rotor 300B by fastening the second holder 320B and the second intermediate member 330B together with the second fasteners 336B, etc.

[0081] The worker fixes the stator 200 inside the motor housing 70. The worker fixes the rotors 300A, 300B to the shaft 340 using nuts 345A, 345B. For example, the worker inserts the shaft shaft portion 341 into the intermediate through-hole 333 of the first rotor 300A and screws the first nut 345A onto the shaft shaft portion 341 so that the first rotor 300A is sandwiched between the first nut 345A and the shaft flange 342. The worker fixes the first rotor 300A to the shaft 340 by tightening the first nut 345A.

[0082] The worker inserts the shaft shaft portion 341 into the intermediate through-hole 333 of the second rotor 300B so that the second rotor 300B is positioned on the opposite side of the stator 200 from the first rotor 300A. Then, the worker positions the first rotor 300A and the second rotor 300B in the circumferential direction CD using the positioning portions 329 of the first rotor 300A and the second rotor 300B. The worker threads the second nut 345B onto the shaft shaft portion 341 so that the second rotor 300B is sandwiched between the second nut 345B and the first rotor 300A. The worker secures the second rotor 300B to the shaft 340 by tightening the second nut 345B.

[0083] According to the present embodiment described so far, the first base portion 315A and the second base portion 315B are overlapped in the axial direction AD. In this configuration, stress generated in the first base portion 315A due to the magnetic force of the first magnet 310A and stress generated in the second base portion 315B due to the magnetic force of the second magnet 310B are likely to be offset by the holder overlapping portion 301 where the first base portion 315A and the second base portion 315B are overlapped.

[0084] Moreover, the first base portion 315A and the second base portion 315B are fixed to the shaft shaft portion 341 by being sandwiched between the first nut 345A and the second nut 345B. Therefore, the entire first base portion 315A and the entire second base portion 315B can be fixed to the shaft shaft portion 341 in the circumferential direction CD by the first nut 345A and the second nut 345B. With this configuration, stress generated in the first base portion 315A or the stress generated in the second base portion 315B is easily dispersed throughout the entire circumferential direction CD at the portions where the first base portion 315A or the second base portion 315B is fixed to the shaft shaft portion 341. Therefore, it is possible to prevent stress from concentrating on a portion of the first base portion 315A or a portion of the second base portion 315B, causing deformation of the first rotor 300A or the second rotor 300B.

[0085] According to this embodiment, the holders 320A, 320B and the intermediate members 330A, 330B are connected to the base portions 315A, 315B. This configuration makes it easy to differentiate the strength and rigidity of the holders 320A, 320B from the intermediate members 330A, 330B. For example, by forming the holders 320A, 320B from a material with a relatively low density, it is easy to reduce the weight of the rotors 300A, 300B. Furthermore, by forming the intermediate members 330A, 330B from a material with a relatively high strength and rigidity, it is easy to achieve a configuration in which the fixing strength of the rotors 300A, 300B to the shaft 340 is high.

[0086] Moreover, first holder 320A and second holder 320B are overlapped in axial direction AD. In this configuration, stresses generated in first holder 320A and second holder 320B are likely to be offset by holder overlapping portion 301. Therefore, even if the strength and rigidity of holders 320A and 320B are relatively low to prioritize weight reduction of base portions 315A and 315B, holder overlapping portion 301 can prevent holders 320A and 320B from being deformed by stress or the like.

[0087] According to this embodiment, the first nut 345A and the second nut 345B sandwich the first intermediate member 330A and the second intermediate member 330B such that the first holder 320A and the second holder 320B are sandwiched between the first intermediate member 330A and the second intermediate member 330B. This allows for a configuration in which the first intermediate member 330A and the second intermediate member 330B sandwich the entire holders 320A and 320B in the circumferential direction CD. This configuration allows for uniform pressure between the intermediate members 330A and 330B sandwiching the holders 320A and 320B in the circumferential direction CD. That is, the surface pressure generated between the intermediate members 330A and 330B and the holders 320A and 320B is easily dispersed in the circumferential direction CD. Therefore, deformation of the holders 320A and 320B due to changes over time or aging can be suppressed throughout the entire circumferential direction CD.

[0088] For example, consider a comparative example in which the holders 320A, 320B are not sandwiched between the first intermediate member 330A and the second intermediate member 330B, unlike the present embodiment. In this comparative example, the intermediate members 330A, 330B are provided between the first holder 320A and the second holder 320B. In this comparative example, the fastening pressure applied by the fasteners 336A, 336B to the holders 320A, 320B and the intermediate members 330A, 330B tends to be large at positions relatively close to the fasteners 336A, 336B in the circumferential direction CD. On the other hand, the fastening pressure tends to be small at positions relatively farther away. Thus, in the comparative example, the surface pressure generated between the intermediate members 330A, 330B and the holders 320A, 320B is not easily dispersed in the circumferential direction CD. Therefore, in the holders 320A and 320B, deformation due to changes over time or the like is unlikely to occur in the areas where the fastening pressure is relatively large, while deformation due to changes over time or the like is likely to occur in the areas where the fastening pressure is relatively small.

[0089] According to this embodiment, at least a portion of the holder overlapping portion 301 is sandwiched between the first intermediate member 330A and the second intermediate member 330B. In this configuration, both the first holder 320A and the second holder 320B are sandwiched between the first intermediate member 330A and the second intermediate member 330B as the holder overlapping portion 301. Therefore, deformation due to changes over time or deterioration over time can be suppressed in the entire circumferential direction CD in each of the first holder 320A and the second holder 320B.

[0090] According to this embodiment, the intermediate members 330A, 330B are housed in the holder recesses 324A, 324B. With this configuration, the intermediate members 330A, 330B can be arranged so as not to protrude from the holders 320A, 320B in the axial direction AD or the radial direction RD. This prevents the motor device 60 from increasing in size by the amount that the intermediate members 330A, 330B protrude from the holders 320A, 320B. This allows the motor device 60 to be made smaller.

[0091] According to this embodiment, the first fastening protrusion 337A is housed in the second holder relief hole 328B, and the second fastening protrusion 337B is housed in the first holder relief hole 328A. This configuration prevents the first fastening protrusion 337A from interfering with the second holder 320B or the second fastening protrusion 337B from interfering with the first holder 320A, which would prevent the first holder 320A and the second holder 320B from being able to overlap in the axial direction AD. Therefore, even in a configuration in which the holders 320A, 320B and the intermediate members 330A, 330B are connected by the fasteners 336, the holder overlapping portion 301 can be formed by the first holder 320A and the second holder 320B.

[0092] According to the present embodiment, the first nut 345A and the second nut 345B are threadedly engaged with the shaft portion 341. In this configuration, it is possible to realize a configuration in which the first nut 345A and the second nut 345B sandwich the first base portion 315A and the second base portion 315B in the axial direction AD.

[0093] According to the present embodiment, the first nut 345A presses the first base portion 315A in the axial direction AD toward the second base portion 315B. Furthermore, the second nut 345B presses the second base portion 315B in the axial direction AD toward the first base portion 315A. In this configuration, the pressing forces of the nuts 345A and 345B can be used to realize a configuration in which the first base portion 315A and the second base portion 315B are sandwiched between the first nut 345A and the second nut 345B.

[0094] According to this embodiment, at least one of the first base portion 315A and the second base portion 315B is hooked onto the shaft flange 342. In this configuration, at least one of the first base portion 315A and the second base portion 315B can be positioned in the axial direction AD by the shaft flange 342. Furthermore, in the configuration in which the shaft flange 342 is hooked onto the first base portion 315A, a configuration in which the first base portion 315A is sandwiched between the shaft flange 342 and the first nut 345A can be realized. In the high-profile configuration in which the shaft flange 342 is hooked onto the second base portion 315B, a configuration in which the second base portion 315B is sandwiched between the shaft flange 342 and the second nut 345B can be realized.

[0095] In this embodiment, the intermediate member 330 is provided at a position away from the holder body portion 323 toward the shaft shaft portion 341. With this configuration, the fastening holes 327, 334 and the fastener 336 can be disposed at a position away from the holder body portion 323 toward the shaft shaft portion 341. This allows the intermediate member 330 to be made smaller in size in the radial direction RD. In this way, by making the intermediate member 330, which has a higher density than the holder 320, more compact, the weight of the base portion 315A can be reduced.

[0096] In the motor 61, a shear force is likely to be applied to the fastener 336 as the rotor 300 rotates. For example, a shear force is likely to be applied to the fastener 336 in a direction in which the holder 320 moves radially outward relative to the intermediate member 330. In contrast, in this embodiment, the fastener 336 is provided at a position spaced radially outward from the intermediate outer periphery portion 331. With this configuration, the fastener 336 can be positioned as far radially outward as possible from the shaft shaft portion 341. In this manner, the greater the distance between the fastener 336 and the motor axis line Cm in the radial direction RD, the more likely the shear force applied to the fastener 336 is to be reduced. Therefore, the fixing strength between the holder 320 and the intermediate member 330 by the fastener 336 can be increased.

[0097] Second Embodiment In the first embodiment, the shaft 340 has a shaft flange 342. In contrast to this, in the second embodiment, the shaft 340 does not have to have a shaft flange 342. The configurations, actions, and effects of the second embodiment that are not particularly described are the same as those of the first embodiment. The second embodiment will be described mainly focusing on the differences from the first embodiment.

[0098] 9, no shaft flange 342 is provided between the first rotor 300A and the second rotor 300B. For example, no shaft flange 342 is provided between the first intermediate member 330A and the second intermediate member 330B. In this configuration, one of the first nut 345A and the second nut 345B corresponds to the catch portion, and the other corresponds to the clamping portion.

[0099] In the manufacturing process of the motor device 60, a worker threads one of the first nut 345A and the second nut 345B onto the shaft shaft portion 341. For example, the worker threads the first nut 345A onto the shaft shaft portion 341. The worker determines the position of the first nut 345A in accordance with the position of the coil portion 211 in the axial direction AD. Thereafter, the worker inserts the shaft shaft portion 341 into the intermediate through-hole 333 of the rotors 300A, 300B. Then, the worker threads the second nut 345B onto the shaft shaft portion 341, and the rotors 300A, 300B are sandwiched between the first nut 345A and the second nut 345B. The worker secures the rotors 300A, 300B to the shaft 340 by tightening the first nut 345A and the second nut 345B.

[0100] Third Embodiment In the first embodiment, each of the first rotor 300A and the second rotor 300B has an intermediate member 330. In contrast to this, in the third embodiment, at least one of the first rotor 300A and the second rotor 300B may have an intermediate member 330. The configurations, actions, and effects not specifically described in the third embodiment are the same as those in the first embodiment. The third embodiment will be described mainly focusing on the differences from the first embodiment.

[0101] As shown in FIG. 10 , the first rotor 300A has a first intermediate member 330A, while the second rotor 300B does not have a second intermediate member 330B. The second rotor 300B is fixed to the first rotor 300A by a common fastener 339. For example, the second holder 320B and the first holder 320A are fastened together by the common fastener 339. The common fastener 339 is formed including a bolt member, a nut member, an engagement pin, etc. The common fastener 339 fastens the first holder 320A and the second holder 320B together while passing through the first holder 320A and the second holder 320B. For example, the common fastener 339 fastens the holders 320A and 320B to the first intermediate member 330A while passing through the holders 320A and 320B as well as the first intermediate member 330A.

[0102] The holders 320A and 320B are fixed to the shaft 340 via a first intermediate member 330A. The first intermediate member 330A is sandwiched between a shaft flange 342 and a first nut 345A. In this embodiment, the shaft flange 342 corresponds to the catch portion, and the first nut 345A corresponds to the sandwiching portion. The motor 61 has the first nut 345A but does not have a second nut 345B.

[0103] In this embodiment, the motor 61 may have a second nut 345B. For example, the first nut 345A and the second nut 345B may sandwich the first intermediate member 330A. In this configuration, one of the first nut 345A and the second nut 345B corresponds to the hook portion, and the other corresponds to the sandwiching portion. In this configuration, the shaft flange 342 does not need to be provided on the shaft shaft portion 341.

[0104] <Other embodiments> The disclosure of this specification is not limited to the exemplified embodiments. The disclosure encompasses the exemplified embodiments and modifications thereto by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and elements shown in the embodiments, and can be implemented in various modifications. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses the omission of parts and elements from the embodiments. The disclosure encompasses the substitution or combination of parts and elements between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is defined by the claims, and should be interpreted as including all modifications within the meaning and scope equivalent to the claims.

[0105] In each of the above embodiments, at least one of the first holder 320A and the second holder 320B may be sandwiched between the first intermediate member 330A and the second intermediate member 330B. For example, of the first holder 320A and the second holder 320B, only the first holder 320A may be sandwiched between the first intermediate member 330A and the second intermediate member 330B. In this configuration, the second holder 320B may be provided on the opposite side of the second intermediate member 330B from the first intermediate member 330A.

[0106] In each of the above embodiments, the fastener 336 does not have to have the fastening protrusion 337. For example, the fastener 336 may be threadedly engaged with one of the holder 320 and the intermediate member 330. In this configuration, a female thread portion may be formed in one of the holder fastening hole 327 and the intermediate fastening hole 334, and the male thread portion of the fastener 336 may be threadedly engaged with the female thread portion.

[0107] In each of the above embodiments, at least a portion of the intermediate member 330 may protrude from the holder recess 324. For example, the intermediate member 330 may protrude from the holder recess 324 in the axial direction AD. Furthermore, the intermediate member 330 may not be housed in the holder recess 324. Furthermore, the holder 320 may not have a holder recess 324.

[0108] In each of the above embodiments, rotor 300 may not have fastener 336. For example, in rotor 300, holder 320 and intermediate member 330 may be formed from a single member. In this configuration, base portion 315 has a holder portion corresponding to holder 320 and an intermediate portion corresponding to intermediate member 330. In base portion 315, the intermediate portion and the like may be fixed to shaft 340 by being sandwiched between a hook portion of shaft flange 342 or the like and a sandwiching portion of first nut 345A or the like.

[0109] In each of the above embodiments, in a configuration in which a catch portion such as the shaft flange 342 is provided on the shaft shank 341, the catch portion does not have to be a convex portion. For example, the catch portion may be a recess or groove formed in the shaft shank 341. In a configuration in which a groove extending in the axial direction AD is formed in the shaft shank 341 as a shaft groove, it is preferable that the intrusion portion of the intermediate member 330 is in a state of being intruded into the groove. In this configuration, the intrusion portion of the intermediate member 330 catches on the end wall surface of the shaft groove, so that the end wall surface of the shaft groove functions as the catch portion. The end wall surface is a portion of the inner wall surface of the shaft groove that extends in a direction perpendicular to the axial direction AD.

[0110] In each of the above embodiments, the rotor 300, the holder 320, the intermediate member 330, the shaft flange 342, and the nut 345 do not have to be formed in an annular shape. For example, the rotor 300, the holder 320, the intermediate member 330, the shaft flange 342, and the nut 345 may be formed to have a portion extending in the circumferential direction CD so that they appear to be annular as a whole.

[0111] In each of the above embodiments, the clamping portion or the pressing member may not include a screw member such as the nut 345. For example, the clamping portion or the pressing member may be fixed to a rotating shaft portion such as the shaft axial portion 341 with a fastener such as a bolt or a screw. In this configuration, the fastener may pass through the clamping portion or the pressing member and be screwed into the rotating shaft portion.

[0112] In each of the above embodiments, an accessory member such as an adhesive member, a heat dissipation member, a spacer member, etc. may be provided in a portion where two or more members are fixed. For example, in a portion where holder 320 and intermediate member 330 are fixed by fastener 336, an accessory member such as an adhesive member may be provided between holder 320 and intermediate member 330.

[0113] In each of the above embodiments, the aircraft on which the motor device 60 is mounted does not have to be a vertical take-off and landing aircraft as long as it is electrically powered. For example, the aircraft may be an electric aircraft capable of take-off and landing with a runway. Furthermore, the aircraft may be a rotary-wing aircraft or a fixed-wing aircraft. The aircraft may also be an unmanned aircraft.

[0114] In each of the above embodiments, the moving body on which the motor device 60 is mounted does not have to be an aircraft, as long as it can move by rotation of a rotating body. For example, the moving body may be a vehicle, a ship, construction machinery, or agricultural machinery. For example, if the moving body is a vehicle or construction machinery, the rotating body may be a wheel for movement, and the output shaft may be an axle. If the moving body is a ship, the rotating body may be a screw propeller for propulsion, and the output shaft may be a propeller shaft. Furthermore, the motor device 60 may be provided in various stationary facilities.

[0115] (Disclosure of technical ideas) This specification discloses multiple technical ideas described in the following multiple clauses. Some clauses may be written in a multiple dependent form, with the subsequent clause referring to the preceding clause as an alternative. Furthermore, some clauses may be written in a multiple dependent form, referring to another multiple dependent clause. These multiple dependent clauses define multiple technical ideas.

[0116] (Technical thought 1) A rotating electric machine (60) driven by a supply of electric power, a stator (200) having a coil portion (211); a rotating shaft portion (341) that rotates around a rotation axis (Cm); a first rotor (300A) that has first magnets (310A) arranged in the coil section in the axial direction (AD) of the rotation axis line, and a first base portion (315A) extending from the first magnets toward the rotation shaft section in the radial direction (RD) of the rotation axis line, and that rotates together with the rotation shaft section; a second rotor (300B) that rotates together with the rotating shaft, the second rotor (300B) including a second magnet (310B) arranged next to the first magnet in the axial direction via the coil portion, and a second base portion (315B) that is overlapped with the first base portion in the axial direction and extends in the radial direction from the second magnet toward the rotating shaft; a hook portion (342; 345A) provided on the rotating shaft portion, on which one of the first base portion and the second base portion is hooked from one side in the axial direction; a clamping portion (345A; 345B) that fixes the first base portion and the second base portion to the rotating shaft portion by clamping at least one of the first base portion and the second base portion between the clamping portion and the hook portion in the axial direction; A rotating electric machine comprising:

[0117] (Technical thought 2) The first base portion is a first holding member (320A) that holds the first magnet; a first fixing member (330A) connected to the first holding member and fixed to the rotary shaft portion by the hook portion and the clamping portion; It has The second base portion is a second holding member (320B) that is overlapped on the first holding member in the axial direction and holds the second magnet; a second fixing member (330B) connected to the second holding member and fixed to the rotary shaft portion by the hook portion and the clamping portion; The rotating electric machine according to Technical Idea 1,

[0118] (Technical Thought 3) At least one of the first holding member and the second holding member is provided so as to be inserted between the first fixing member and the second fixing member, A rotating electric machine described in Technical Idea 2, wherein the hook portion and the clamping portion clamp the first fixing member and the second fixing member between the hook portion and the clamping portion so that the first fixing member and the second fixing member clamp at least one of the first holding member and the second holding member.

[0119] (Technical Thought 4) A rotating electric machine described in Technical Idea 3, wherein at least a portion of the holding overlap portion (301) where the first holding member and the second holding member are overlapped is sandwiched between the first fixing member and the second fixing member.

[0120] (Technical Thought 5) the first holding member is provided with a first recess (324A) that is recessed toward the second holding member in the axial direction and that accommodates the first fixing member, A rotating electric machine described in any one of technical ideas 2 to 4, wherein the second retaining member is provided with a second recess (324B) that is recessed toward the first retaining member in the axial direction and accommodates the second fixing member.

[0121] (Technical Thought 6) the first base portion has a first connector (336A) that connects the first holding member and the first fixing member, the second base portion has a second connector (336B) that connects the second holding member and the second fixing member, The first holding member is provided with a first receiving portion (328A) that receives a second protruding portion (337B) of the second connector that protrudes from the second holding member toward the first holding member, A rotating electric machine described in any one of technical ideas 2 to 5, wherein the second holding member is provided with a second accommodating portion (328B) that accommodates a first protrusion (337A) in the first connector that protrudes from the first holding member toward the second holding member.

[0122] (Technical Thought 7) The rotating electric machine according to any one of Technical Ideas 1 to 6, wherein at least one of the catch portion and the clamping portion is a screw member that is screwed onto the rotating shaft portion.

[0123] (Technical Thought 8) a first pressing member (345A) attached to the rotary shaft portion and pressing the first base portion toward the second base portion in the axial direction; a second pressing member (345B) attached to the rotary shaft portion and configured to press the second base portion toward the first base portion in the axial direction; Equipped with The rotating electric machine according to any one of Technical Ideas 1 to 7, wherein at least one of the first pressing member and the second pressing member is the clamping portion.

[0124] (Technical Thought 9) the first pressing member presses the first base portion in the axial direction toward the catch portion, the second pressing member presses the second base portion in the axial direction toward the catch portion, The hook portion has an outer peripheral protrusion (342) provided on the outer peripheral surface (341a) of the rotary shaft portion, The rotating electric machine according to Technical Idea 8, wherein at least one of the first base portion and the second base portion is hooked onto the outer peripheral convex portion. [Explanation of symbols]

[0125] 60...motor device as a rotating electric machine, 200...stator, 211...coil portion, 300A...first rotor, 300B...second rotor, 301...holder overlapping portion as holding overlapping portion, 310A...first magnet, 310B...second magnet, 315A...first base portion, 315B...second base portion, 320A...first holder as first holding member, 320B...second holder as second holding member, 324A...first holder recess as first recess, 324B...second holder recess as second recess, 328A...first holder relief hole as first accommodating portion, 328B...second holder relief hole as second accommodating portion, 330A...first intermediate as first fixing member member, 330B...second intermediate member as second fixing member, 336A...first fastening device as first connecting device, 336B...second fastening device as second connecting device, 337A...first fastening protrusion as first protrusion, 337B...second fastening protrusion as second protrusion, 341...shaft shaft portion as rotating shaft portion, 341a...shaft outer peripheral surface as outer peripheral surface, 342...shaft flange as outer peripheral convex portion as hooking portion, 345A...first nut as clamping portion, hooking portion and first pressing member, 345B...second nut as clamping portion and second pressing member, Cm...motor axis as rotation axis, AD...axial direction, RD...radial direction.

Claims

1. A rotating electric machine (60) driven by a supply of electric power, a stator (200) having a coil portion (211); A rotating shaft portion (341) that rotates around a rotation axis (Cm), a first rotor (300A) that has first magnets (310A) arranged in the coil portion in the axial direction (AD) of the rotation axis line, and a first base portion (315A) extending from the first magnets toward the rotation shaft portion in the radial direction (RD) of the rotation axis line, and that rotates together with the rotation shaft portion; a second rotor (300B) that has a second magnet (310B) arranged next to the first magnet in the axial direction via the coil portion, and a second base portion (315B) that is overlapped with the first base portion in the axial direction and extends in the radial direction from the second magnet toward the rotating shaft portion, and that rotates together with the rotating shaft portion; a hook portion (342; 345A) provided on the rotating shaft portion, to which one of the first base portion and the second base portion is hooked from one side in the axial direction; a clamping portion (345A; 345B) that fixes the first base portion and the second base portion to the rotating shaft portion by clamping at least one of the first base portion and the second base portion between the clamping portion and the hook portion in the axial direction; A rotating electric machine comprising:

2. The first base portion a first holding member (320A) that holds the first magnet; a first fixing member (330A) connected to the first holding member and fixed to the rotating shaft portion by the hook portion and the clamping portion; It has The second base portion is a second holding member (320B) that is overlapped on the first holding member in the axial direction and holds the second magnet; a second fixing member (330B) connected to the second holding member and fixed to the rotary shaft portion by the hook portion and the clamping portion; The rotating electric machine according to claim 1 , further comprising:

3. At least one of the first holding member and the second holding member is provided so as to be inserted between the first fixing member and the second fixing member, 3. The rotating electric machine according to claim 2, wherein the hook portion and the clamping portion clamp the first fixing member and the second fixing member between the hook portion and the clamping portion so that the first fixing member and the second fixing member clamp at least one of the first holding member and the second holding member.

4. 4. The rotating electric machine according to claim 3, wherein at least a portion of a holding overlap portion (301) formed by overlapping the first holding member and the second holding member is sandwiched between the first fixing member and the second fixing member.

5. The first holding member is provided with a first recess (324A) that is recessed toward the second holding member in the axial direction and that accommodates the first fixing member, A rotating electric machine as described in any one of claims 2 to 4, wherein the second retaining member has a second recess (324B) that is recessed toward the first retaining member in the axial direction and accommodates the second fixing member.

6. the first base portion has a first connector (336A) that connects the first holding member and the first fixing member, the second base portion has a second connector (336B) connecting the second holding member and the second fixing member, The first holding member is provided with a first accommodating portion (328A) that accommodates a second protruding portion (337B) that protrudes from the second holding member toward the first holding member in the second connector, A rotating electric machine as described in any one of claims 2 to 4, wherein the second retaining member is provided with a second accommodating portion (328B) that accommodates a first protrusion (337A) in the first connector that protrudes from the first retaining member toward the second retaining member.

7. 4. The rotating electric machine according to claim 1, wherein at least one of the catch portion and the clamping portion is a screw member that is screwed onto the rotating shaft portion.

8. a first pressing member (345A) attached to the rotating shaft portion and pressing the first base portion toward the second base portion in the axial direction; a second pressing member (345B) attached to the rotating shaft portion and pressing the second base portion toward the first base portion in the axial direction; Equipped with 4. The rotating electric machine according to claim 1, wherein at least one of the first pressing member and the second pressing member is the clamping portion.

9. the first pressing member presses the first base portion toward the catch portion in the axial direction, the second pressing member presses the second base portion toward the catch portion in the axial direction, The hook portion has an outer peripheral protrusion (342) provided on the outer peripheral surface (341a) of the rotating shaft portion, The rotating electric machine according to claim 8 , wherein at least one of the first base portion and the second base portion is hooked onto the outer peripheral protrusion.

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