Rotary electric machine and method for manufacturing rotary electric machine

Abstract

To provide a rotary electric machine capable of reducing the weight of a rotor while balancing the rotation of the rotor.SOLUTION: The motor 61 includes a stator 200 and a rotor 300. The stator 200 and the rotor 300 are arranged in the axial direction AD via an axial gap 305. The rotor 300 includes a magnet 310, a base portion 315, and an adjusting portion 400. The magnet 310 is provided on the base portion 315. The base portion 315 supports the magnet 310 and the adjusting portion 400. A holder chamber 326 is formed in the base portion 315. A plurality of holder chambers 326 are arranged in the circumferential direction CD. The adjustment portion 400 is accommodated in the holder chamber 326. The adjustment portion 400 is joined to the base portion 315 in the chamber space 329. The adjustment portion 400 is provided in at least one chamber space 329 so as to keep the rotation balance of the rotor 300.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The disclosure in this specification relates to a rotating electric machine and a method for manufacturing a rotating electric machine. [Background technology]

[0002] Patent Document 1 describes a motor having a stator and a rotor. The rotor has a permanent magnet, a holding member that holds the permanent magnet, and a non-magnetic member attached to the holding member. The non-magnetic member is provided so that it can be machined from the outer surface of the rotor. Weight imbalance in the rotor is adjusted by cutting the non-magnetic member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-295757 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned Patent Document 1, portions of the non-magnetic member that are not necessary for balancing the rotor are cut off. In other words, the weight imbalance of the rotor is adjusted by a minus balance adjustment. However, with a minus balance adjustment, excess portions of the non-magnetic member that do not contribute to adjusting the rotor's weight imbalance tend to remain on the rotor. As a result, there is a concern that the rotor will become heavier by the amount of the excess portions of the non-magnetic member.

[0005] An object of the present disclosure is to provide a rotating electric machine and a method for manufacturing a rotating electric machine that can reduce the weight of the rotor while maintaining the rotational balance 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); a rotor (300) that rotates about a rotation axis (Cm) relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; It has The balance member is a rotating electrical machine joined to the base portion in the accommodation space.

[0008] According to the rotating electric machine described above, the balance members are joined to the base portion in the housing space. With this configuration, only the balance members necessary for the rotational balance of the rotor can be provided on the base portion. That is, the rotational balance of the rotor can be achieved by positive balance adjustment. With positive balance adjustment, excess portions of the balance members that do not contribute to the rotational balance of the rotor are unlikely to be applied to the rotor. Therefore, the weight of the rotor can be reduced while maintaining the rotational balance of the rotor.

[0009] The disclosed aspects include: A stator (200); a rotor (300) that rotates relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; A manufacturing method for a rotating electric machine (60) having the following features: An acquisition process for acquiring rotational balance (P104 to P106, P109, P111, P112), a storing step (P108) of storing the molten material (405) in a storage space according to the rotation balance; a solidification step (P110) of solidifying the molten material contained in the containing space to form a balance member joined to the base part in the containing space; The present invention relates to a method for manufacturing a rotating electric machine having the above-mentioned features.

[0010] According to the method for manufacturing the rotating electric machine, the molten material contained in the housing space is solidified to form a balance member joined to the base portion in the housing space, which allows the rotor to be balanced in rotation while reducing its weight, similar to the rotating electric machine described above. [Brief explanation of the drawings]

[0011] [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 holder chamber. [Figure 8] 4 is a flowchart showing the procedure of a manufacturing process for the motor device. [Figure 9] FIG. 4 is a plan view showing a state in which the rotor is attached to the adjustment device. [Figure 10] FIG. 10 is a front view showing a state in which molten material is injected into the holder chamber by the injection device. [Figure 11] FIG. 10 is a plan view showing a state in which molten material is poured into the holder chamber. [Figure 12] FIG. 10 is a plan view showing the state in which the shape of the molten material has been adjusted. [Figure 13] FIG. 10 is a front view showing a state in which the molten material has been solidified by the solidification device to form an adjustment portion. [Figure 14] FIG. 10 is a plan view of a rotor according to a second embodiment. [Figure 15] FIG. [Figure 16] FIG. 10 is a vertical cross-sectional view of a motor according to a third embodiment. [Figure 17] FIG. 10 is a plan view of a rotor according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] 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.

[0013] First Embodiment The propulsion system 30 shown in FIG. 1 is mounted on the eVTOL 10. The eVTOL 10 is an electric vertical take-off and landing aircraft. An electric vertical take-off and landing aircraft is an electric vertical take-off and landing aircraft that is capable of vertical take-off and landing. eVTOL is an abbreviation for electric Vertical Take-Off and Landing aircraft. The eVTOL 10 is an electric air vehicle that flies in the atmosphere, and is sometimes referred to as an electric air vehicle. The eVTOL 10 is also an electric aircraft, and is sometimes referred to as an electric aircraft. The eVTOL 10 is a manned air vehicle that carries a crew member. The crew member of the eVTOL 10 includes a pilot who operates or drives the aircraft. The propulsion system 30 is a system that drives the eVTOL 10 to fly. The propulsion system 30 is sometimes referred to as a flight system.

[0014] 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 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, and the like.

[0015] The eVTOL 10 has a cabin. The cabin is provided inside the eVTOL 10. For example, the cabin is the internal space of the aircraft body 12, and is formed by the aircraft body 12. The cabin can be a crew cabin 14 or a cargo bay. The crew cabin 14 can be a passenger cabin or a pilot cabin. The crew cabin 14 is provided with seats for crew members to sit in. The crew cabin 14 does not have to have crew members on board, and can instead house cargo.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The eVTOL 10 has a battery 31, a distributor 32, a flight control device 40, and an EPU 50. The battery 31, the distributor 32, the flight control device 40, and the EPU 50 are included in the 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.

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

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] The inverter device 80 has a P line 141 and an N line 142. The P line 141 and the N line 142 electrically connect the battery 31 and the inverter 81. The P line 141 is electrically connected to the positive electrode of the battery 31. The N line 142 is electrically connected to the negative electrode of the battery 31. In the battery 31, the positive electrode is 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The motor 61 is an axial gap motor. In the motor 61, the stator 200 and the rotor 300 are arranged in the axial direction AD with an axial gap 305 interposed therebetween. An axial gap motor is sometimes called an axial motor. 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 called a double axial motor.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The base portion 315 has a base facing surface 316a and a base opposite surface 316b. The base portion 315 has a pair of plate surfaces perpendicular to the axial direction AD. One of the pair of plate surfaces is the base facing surface 316a, and the other is the base opposite surface 316b. The base facing surface 316a and the base opposite surface 316b are included on the outer surface of the base portion 315. The base facing surface 316a faces the stator 200 in the axial direction AD. At least a portion of the base facing surface 316a faces the stator 200. The base opposite surface 316b faces the side opposite to the stator 200 in the axial direction AD. The magnet 310 is provided at a position closer to the base facing surface 316a than the base opposite surface 316b in the axial direction AD.

[0047] As shown in FIGS. 4 to 7, 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 in the axial direction AD from the magnet 310 toward the shaft 340. The holder 320 forms the outer circumferential end of the base portion 315. In the base portion 315, the holder 320 and the intermediate member 330 form a base-facing surface 316a and a base-opposing surface 316b.

[0048] The holder 320 is formed containing a resin material or the like. For example, the holder 320 is formed containing a fibrous material such as CFRP. CFRP is carbon fiber reinforced plastic. When the holder 320 is formed containing a fibrous material, the rotor 300 is likely to be lightweight. The density of the holder 320 is lower than the density of the shaft 340. Density is mass per unit volume. In terms of mass per unit volume, the holder 320 is lighter than the shaft 340. The density of the material forming the holder 320 is lower than the density of the material forming the shaft 340.

[0049] As shown in FIGS. 5 to 7, 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 so as to extend 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.

[0050] 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.

[0051] 7, in the axial direction AD, thickness dimension D2 of holder body portion 323 is larger than thickness dimension D1 of holder outer peripheral portion 321. A step surface is formed by holder outer peripheral portion 321 and holder body portion 323 at the boundary between holder outer peripheral portion 321 and holder body portion 323. This step surface is included in base opposing surface 316a.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] As shown in FIGS. 5 to 7 , 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 include bolts, nuts, and engagement pins. The fasteners 336 are included in the base portion 315. The fasteners 336 secure the holder 320 and the intermediate member 330 together by penetrating a portion where a part of the holder 320 and a part of the intermediate member 330 overlap in the axial direction AD. For example, the fasteners 336 secure the holder inner peripheral portion 322 and the intermediate outer peripheral portion 331 together by penetrating a portion where the holder inner peripheral portion 322 and the intermediate outer peripheral portion 331 overlap in the axial direction AD. A plurality of fasteners 336 are arranged in the circumferential direction CD. The holder 320 and the intermediate member 330 are secured by the fasteners 336 at a plurality of positions in the circumferential direction CD.

[0059] As shown in FIGS. 4, 6, and 7, the holder 320 is formed with 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.

[0060] The holder 320 has a sandwich structure. The sandwich structure is included in at least the holder outer peripheral 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 a direction perpendicular to the circumferential direction CD and the radial direction RD. In the base portion 315, the plurality of partition walls form a beam structure to ensure the strength of the holder 320. For example, the partition walls extending in the radial direction RD and the circumferential direction CD function as beams.

[0061] For example, as shown in Figures 6 and 7, the holder chamber 326 is provided in the holder body portion 323. The holder chamber 326 is located away from the magnet 310 on the inner circumferential side. For example, the holder chamber 326 is located away from the holder outer circumferential portion 321 on the inner circumferential side. The holder chamber 326 is provided at a position closer to the base opposing surface 316a than the base opposite surface 316b. The holder chambers 326 are arranged in the radial direction RD along the base opposing surface 316a of the magnet 310. A plurality of holder chambers 326 are arranged in the circumferential direction CD. The holder chambers 326 are sometimes referred to as small rooms.

[0062] The holder chamber 326 is formed by a recess provided in the holder 320. The holder chamber 326 is a recess provided in the base-facing surface 316a. The holder chamber 326 is open toward the side opposite to the base-opposing surface 316b. In the holder chamber 326, a chamber opening 328 is provided in the base-facing surface 316a. The chamber opening 328 is an opening of the holder chamber 326. The chamber opening 328 can open a chamber space 329 toward the side opposite to the base-opposing surface 316b. The chamber space 329 is an internal space of the holder chamber 326. In the rotor 300, a plurality of holder chambers 326 are arranged in the circumferential direction CD, and thus a plurality of chamber spaces 329 are arranged in the circumferential direction CD.

[0063] The holder chamber 326 has an interior surface 327. The interior surface 327 is the inner surface of the holder chamber 326. The interior surface 327 is a forming surface that forms a chamber space 329. The interior surface 327 includes a bottom surface 327a, an outer peripheral wall surface 327b, an inner peripheral wall surface 327c, and a side wall surface 327d. The bottom surface 327a is provided on the opposite side of the chamber opening 328 across the chamber space 329. The bottom surface 327a is aligned with the chamber opening 328 in the axial direction AD. The outer peripheral wall surface 327b is provided on the outer peripheral side of the chamber space 329 in the radial direction RD. The inner peripheral wall surface 327c is provided on the inner peripheral side of the chamber space 329 in the radial direction RD. The outer peripheral wall surface 327b and the inner peripheral wall surface 327c face each other across the chamber space 329. The side wall surfaces 327d are arranged in pair in the circumferential direction CD with the chamber space 329 interposed therebetween. The pair of side wall surfaces 327d face each other with the chamber space 329 interposed therebetween.

[0064] The chamber space 329 is separated from the external space of the rotor 300 by the base portion 315. That is, the chamber space 329 is separated by the interior surface 327. The bottom surface 327a separates the chamber space 329 from the base opposite surface 316b side. The outer peripheral wall surface 327b separates the chamber space 329 from the outer periphery side. The inner peripheral wall surface 327c separates the chamber space 329 from the inner periphery side. One of the pair of side wall surfaces 327d separates the chamber space 329 from one side in the circumferential direction CD. The other separates the chamber space 329 from the other side in the circumferential direction CD.

[0065] At least a portion of the holder chamber 326 is arranged in a position aligned with the magnet 310 in the radial direction RD. The holder chamber 326 is located across the axial gap 305 in the axial direction AD. The holder chamber 326 extends in the axial direction AD so as to bridge between the magnet 310 and the coil portion 211. In the axial direction AD, a height dimension D4 of the holder chamber 326 is greater than a height dimension D3 of the magnet 310. The height dimension D4 is the distance between the chamber opening 328 and the bottom surface 327a in the axial direction AD. The height dimension D4 is also the height dimension of the chamber space 329. In the axial direction AD, the height dimension of the adjustment unit 400, which will be described later, is greater than the height dimension D3 of the magnet 310.

[0066] The rotor 300 has an adjustment unit 400. The adjustment unit 400 is provided on the base unit 315 so as to balance the rotation of the rotor 300. That is, the adjustment unit 400 is provided on the base unit 315 so as to eliminate any imbalance of the rotor 300 while the rotor 300 is rotating. The rotational balance is the balance of the rotor 300 while the rotor 300 is rotating. The rotor 300 is in a state where the weight balance of the rotor 300 has been adjusted by the adjustment unit 400 so as to improve the rotational balance of the rotor 300. The adjustment unit 400 corresponds to a balance member. The adjustment unit 400 is sometimes referred to as a balance adjustment unit.

[0067] In the motor 61 provided with the adjustment unit 400, the adjustment unit 400 suppresses the rotor 300 from vibrating in the axial direction AD or the radial direction RD due to centrifugal force or the like as the rotor 300 rotates. For example, in the motor 61, if the central axis of gravity passing through the center of gravity of the rotor 300 does not coincide with the rotational axis of the rotor 300, the rotor 300 is likely to vibrate as the rotor 300 rotates. Therefore, the adjustment unit 400 is provided on the rotor 300 so that the central axis of gravity coincides with the rotational axis.

[0068] The adjustment unit 400 is made of a resin material or the like. The adjustment unit 400 is formed as a separate member from the base unit 315 and the holder 320. For example, the density of the adjustment unit 400 is greater than the density of the holder 320. The adjustment unit 400 may be formed to include a metal filler or the like to increase the density.

[0069] The adjustment unit 400 is provided in at least one holder chamber 326. For example, the adjustment unit 400 is housed in a chamber space 329 in the at least one holder chamber 326. The chamber space 329 corresponds to the housing space. In the rotor 300, the adjustment unit 400 is housed in the chamber space 329, and thus the base portion 315 supports the adjustment unit 400. In the radial direction RD, the holder chamber 326 is provided at a position spaced inward from the magnet 310, and thus the adjustment unit 400 is provided at a position spaced inward from the magnet 310. In an axial motor, the axial direction AD corresponds to the arrangement direction, and the radial direction RD corresponds to the orthogonal direction.

[0070] The adjustment unit 400 is joined to the base unit 315 and the holder 320 in the holder chamber 326. The adjustment unit 400 is joined to the base unit 315 and the holder 320 by welding the adjustment unit 400 to the base unit 315. The adjustment unit 400 is joined to at least a part of the chamber interior surface 327. For example, the adjustment unit 400 is joined to at least the outer peripheral wall surface 327b in the holder chamber 326. In the holder chamber 326, when the rotor 300 is rotating, the outer peripheral wall surface 327b restricts the adjustment unit 400 from moving outward due to centrifugal force or the like. In other words, the adjustment unit 400 is caught on the outer peripheral wall surface 327b from the inner peripheral side. The outer peripheral wall surface 327b corresponds to a restricting wall surface.

[0071] The adjustment unit 400 may be joined to the bottom surface 327a or the side wall surface 327d in the holder chamber 326. For example, the adjustment unit 400 extends from the outer peripheral wall surface 327b along the bottom surface 327a toward the inner peripheral wall surface 327c. The adjustment unit 400 extends in the circumferential direction CD along the outer peripheral wall surface 327b and the bottom surface 327a so as to span the pair of side wall surfaces 327d. The adjustment unit 400 is provided at a position spaced away from the inner peripheral wall surface 327c toward the outer periphery.

[0072] In the base portion 315, an adjustment unit 400 is housed in each of the at least two chamber spaces 329. The weight of the adjustment unit 400 differs between the at least two chamber spaces 329. For example, the weight of the adjustment unit 400 housed in one chamber space 329 differs from the weight of the adjustment unit 400 housed in the other chamber space 329. The weights of the adjustment units 400 differ between the at least two chamber spaces 329 because the amount or volume of the adjustment units 400 differs between the two chamber spaces 329. Note that the adjustment units 400 housed in the at least two chamber spaces 329 may have the same density or different densities.

[0073] The plurality of chamber spaces 329 formed in the base portion 315 include chamber spaces 329 that house the adjustment units 400 and chamber spaces 329 that do not house the adjustment units 400. Note that the adjustment units 400 may be housed in all of the plurality of chamber spaces 329 formed in the base portion 315.

[0074] 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.

[0075] As shown in FIGS. 5 and 7 , 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.

[0076] The first rotor 300A and the second rotor 300B have corresponding components and parts. As shown in FIG. 7, the components and parts of the first rotor 300A are designated by adding "1" to the names of the components 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 chamber 326A, a first chamber opening 328A, a first chamber space 329A, and a first adjustment portion 400A. The first holder 320A has a first holder outer peripheral portion 321A, a first holder inner peripheral portion 322A, and a first holder body portion 323A. The first rotor 300A also has a first intermediate member 330A. 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.

[0077] In the first rotor 300A, the first chamber opening 328A corresponds to the first housing opening, the first chamber space 329A corresponds to the first housing space, and the first adjustment part 400A corresponds to the first balance member.

[0078] 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 chamber 326B, a second chamber opening 328B, a second chamber space 329B, and a second adjustment portion 400B. The second holder 320B has a second holder outer peripheral portion 321B, a second holder inner peripheral portion 322B, and a second holder body portion 323B. The second rotor 300B also has a second intermediate member 330B. The second intermediate member 330B has a second intermediate outer peripheral portion 331B and a second intermediate inner peripheral portion 332B. The nut 345 that secures the second rotor 300B is a second nut 345B.

[0079] In the second rotor 300B, the second chamber opening 328B corresponds to the second accommodation opening, the second chamber space 329B corresponds to the second accommodation space, and the second adjustment part 400B corresponds to the second balance member.

[0080] 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 oriented so that their respective base opposing surfaces 316a overlap each other. The first holder chamber 326A and the second holder chamber 326B are aligned in the axial direction AD. The boundary between the first rotor 300A and the second rotor 300B includes at least a portion of each base opposing surface 316a, the first chamber opening 328A, and the second chamber opening 328B. The first chamber space 329A and the second chamber space 329B are continuous spaces via the chamber openings 328A and 328B. Note that in the motor 61, the first holder chamber 326A and the second holder chamber 326B may be positioned offset in the radial direction RD or the circumferential direction CD.

[0081] The first rotor 300A is provided such that the first base portion 315A covers the second adjustment portion 400B via the second chamber opening 328B. The second chamber opening 328B is covered by the base facing surface 316a of the first base portion 315A and the first holder chamber 326A. Therefore, even if the second adjustment portion 400B is released from the second base portion 315B, the base facing surface 316a of the first base portion 315A and the first holder chamber 326A prevent the second adjustment portion 400B from scattering from the second rotor 300B.

[0082] The second rotor 300B is provided such that the second base portion 315B covers the first adjustment portion 400A via the first chamber opening 328A. The first chamber opening 328A is covered by the base-opposing surface 316a of the second base portion 315B and the second holder chamber 326B. Therefore, even if the first adjustment portion 400A is released from the first base portion 315A, the base-opposing surface 316a of the second base portion 315B and the second holder chamber 326B prevent the first adjustment portion 400A from scattering from the first rotor 300A.

[0083] 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.

[0084] 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 axis portion 341. The holder overlapping portion 301 is located on the inner circumferential side of the stator 200. For example, the holder overlapping portion 301 is located at a position spaced radially outward from the coil portion 211. A motor 61 in which the holder overlapping portion 301 is provided on the inner circumferential side of the stator 200 is sometimes referred to as an inner rotor type motor.

[0085] The holder overlapping portion 301 has a overlap outer peripheral end 301a and an overlap inner peripheral end 301b. The overlap outer peripheral end 301a is the outer peripheral end of the holder overlapping portion 301 and extends annularly in the circumferential direction CD. The overlap outer peripheral end 301a is located radially outwardly away from the shaft shaft portion 341 and the intermediate members 330A, 330B. The overlap outer peripheral end 301a is included in the boundary between the first holder body portion 323A and the second holder body portion 323B. The overlap inner peripheral end 301b is the inner peripheral end of the holder overlapping portion 301 and extends annularly in the circumferential direction CD. The overlap inner peripheral end 301b is formed by the inner peripheral end of the holder inner peripheral portion 322. The overlap inner peripheral end 301b is included in the boundary between the first holder inner peripheral portion 322A and the second holder inner peripheral portion 322B.

[0086] The holder chambers 326A and 326B are disposed between the overlapping outer peripheral end 301a and the overlapping inner peripheral end 301b in the radial direction RD. Therefore, the first holder chamber 326A and the second holder chamber 326B are unlikely to separate from each other in the axial direction AD. That is, the base-opposing surface 316a of the first rotor 300A and the base-opposing surface 316a of the second rotor 300B are unlikely to separate from each other in the axial direction AD. Therefore, even if the first adjustment part 400A and the first base part 315A are disengaged from each other, the first adjustment part 400A is prevented from scattering outside the rotors 300A and 300B through the gap between the first rotor 300A and the second rotor 300B. Similarly, even if the connection between the second adjustment part 400B and the second base part 315B is released, the second adjustment part 400B is prevented from scattering outside the rotors 300A, 300B through the gap between the first rotor 300A and the second rotor 300B.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 7, 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.

[0092] 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.

[0093] Next, a method for manufacturing the motor device 60 will be described. The manufacturing process for manufacturing the motor device 60 will be described with reference to the flowchart in Fig. 8. The manufacturing method for the motor device 60 corresponds to the manufacturing method for a rotating electric machine.

[0094] 8, a worker performs manufacturing steps for manufacturing the rotor 300, from step P101 to step P113. In step P101, the worker makes preparations for manufacturing the stator 200. The worker prepares parts and members for manufacturing the stator 200. For example, the worker prepares the rotor 300 in a state in which the adjustment unit 400 is not provided. Note that in this embodiment, both the rotor 300 before the adjustment unit 400 is provided and the rotor 300 after the adjustment unit 400 is provided may be simply referred to as the rotor 300.

[0095] The worker also prepares the molten material 405, the adjusting device 410, the injection device 420, the solidifying device 430, and the like. The molten material 405 is a material for molding the adjusting part 400. The molten material 405 is a material in which a resin material or the like is in a molten state. The molten material 405 is formed to contain a curable molten resin. For example, the molten material 405 is formed to contain a UV-curable molten resin that is cured by ultraviolet light. The molten material 405 may also be formed to contain a thermosetting molten resin or a room-temperature-curable molten resin. The molten material 405 is sometimes referred to as a liquid adhesive or a balance adjustment material.

[0096] In step P102, the worker performs a blasting process on the rotor 300. The blasting process is a process for increasing the wettability of the indoor surface 327. For example, the worker increases the wettability of the indoor surface 327 by roughening the indoor surface 327 by blasting, laser irradiation, chemical treatment, or the like.

[0097] In step P103, as shown in FIGS. 9 and 10, the worker mounts the rotor 300 on the adjustment device 410. The adjustment device 410 is a device for adjusting the rotational balance of the rotor 300. The adjustment device 410 is capable of rotating the rotor 300 mounted on the adjustment device 410. The adjustment device 410 corresponds to a rotation device. Step P103 corresponds to an mounting step.

[0098] The adjustment device 410 has an adjustment housing 411, an adjustment shaft 412, an adjustment actuator 413, an adjustment sensor 414, an adjustment control unit 415, and an adjustment operation unit 416. The adjustment housing 411 accommodates the adjustment actuator 413 and other components. The adjustment actuator 413 is formed to include an electric motor and other components. The adjustment shaft 412 rotates as the adjustment actuator 413 is driven. The adjustment shaft 412 rotates about the adjustment axis Cad. When the rotor 300 is attached to the adjustment device 410, for example by inserting the adjustment shaft 412 into the intermediate through-hole 333, the adjustment axis Cad and the motor axis Cm coincide with each other. In this case, the rotor 300 rotates about the adjustment axis Cad, thereby rotating about the motor axis Cm.

[0099] The adjustment sensor 414 is a sensor capable of detecting the rotational balance of the rotor 300. The adjustment sensor 414 is sometimes referred to as a balance measuring instrument. The adjustment control unit 415 is capable of measuring the rotational balance of the rotor 300 using a detection signal from the adjustment sensor 414. The adjustment operation unit 416 has an operation panel that can be operated by an operator. By operating the adjustment operation unit 416, the operator can cause the adjustment device 410 to rotate the rotor 300, stop the rotation of the rotor 300, measure the rotational balance, and the like.

[0100] In steps P104 to P113, the worker performs a plus balance adjustment to balance the rotation of the rotor 300. In the plus balance adjustment, the rotation balance of the rotor 300 is adjusted by attaching a weight such as the adjustment unit 400 to the rotor 300. In the plus balance adjustment, it is easy to keep the weight attached to the rotor 300 to a minimum.

[0101] In steps P104 to P106, the worker performs acquisition work to acquire the rotational balance of rotor 300. Steps P104 to P106 correspond to the acquisition step. In steps P104 to P106, the acquisition work for the rotational balance is performed before adjustment unit 400 is provided on rotor 300. In other words, the rotational balance is acquired before the rotational balance of rotor 300 is adjusted. Steps P104 to P106 correspond to the preliminary step.

[0102] In step P104, the worker rotates rotor 300 by operating adjustment operation unit 416, etc. Step P104 corresponds to the rotation step. In step P105, the worker performs a measurement operation to measure the rotation balance by operating adjustment operation unit 416, etc., while rotor 300 is rotating. The worker may also perform an operation to display the measurement results of the rotation balance on a display screen. Step P105 corresponds to the measurement step. After completing the measurement operation, in step P106, the worker stops the rotation of rotor 300 by operating adjustment operation unit 416, etc.

[0103] In step P107, the worker calculates the injection amount of the molten material 405 by operating the adjustment operation unit 416, for example. The worker calculates the injection amount of the molten material 405 for each of the multiple chamber spaces 329. Among the multiple chamber spaces 329, chamber spaces 329 with an injection amount of zero are not the injection target of the molten material 405. Among the multiple chamber spaces 329, chamber spaces 329 with an injection amount of non-zero are the injection target of the molten material 405. The worker sets the injection position for injecting the molten material 405 by calculating the injection amount for each of the multiple chamber spaces 329. The injection amount of the molten material 405 is the capacity of the molten material 405 to be accommodated in the chamber space 329. The worker calculates the injection amount of the molten material 405 based on the rotation balance acquisition results and measurement results. Step P107 corresponds to a calculation step.

[0104] The injection amount of the molten material 405 is calculated using an arithmetic expression or the like. For example, the adjustment control unit 415 calculates the injection amount of the molten material 405 for each of the multiple chamber spaces 329 using, for example, equation F1 shown in FIG. 10 . In equation F1, it is assumed that n chamber spaces 329 are provided in the rotor 300. n is a natural number. The vector quantity U is a value indicating the degree of imbalance for the rotor 300. The adjustment control unit 415 calculates the injection amount of the molten material 405 for each of the n chamber spaces 329 so that the vector quantity U becomes zero. The vector quantity U is sometimes referred to as the imbalance amount.

[0105] In formula F1, m1 to mn are the amounts of molten material 405 injected into the chamber spaces 329, and are values ​​set for each of the n chamber spaces 329. The vector quantities e1 to en are values ​​indicating the distance and direction of the molten material 405 relative to the motor axis Cm, and are values ​​set for each of the n chamber spaces 329. For example, the distance of the molten material 405 relative to the motor axis Cm is the distance between the motor axis Cm and the center of the molten material 405. The vector quantities e1 to en are values ​​indicating the position of the molten material 405 relative to the motor axis Cm. Formula F1 indicates that the rotational balance of the rotor 300 depends on the position of the adjustment unit 400 in addition to the weight and mass of the adjustment unit 400.

[0106] After the operator starts rotating rotor 300 in step P104, operation adjustment device 410 may automatically perform steps P105 to P107 without waiting for the operator to operate adjustment operation unit 416.

[0107] In step P108, as shown in FIG. 10 , the worker uses the injection device 420 to inject the molten material 405 into the chamber spaces 329 to be injected. For example, the worker injects a predetermined amount of the molten material 405 into each of the two chamber spaces 329. The injection device 420 is a device for injecting the molten material 405 into the chamber spaces 329. The injection device 420 may be a device independent of the adjustment device 410, or may be a device integrally provided with the adjustment device 410. The worker stores the molten material 405 in the chamber spaces 329 based on the rotation balance acquisition results and measurement results. Step P108 corresponds to a storing step.

[0108] In step P109, the worker rotates the rotor 300, similar to step P104. The worker shapes the molten material 405 by rotating the rotor 300. Step P109 corresponds to a shaping step. The worker shapes the molten material 405 by utilizing centrifugal force generated by the rotation of the rotor 300. Step P109 corresponds to a rotation step.

[0109] For example, as shown in FIG. 11, before the rotor 300 starts to rotate, the molten material 405 assumes a shape corresponding to the manner in which it was poured into the chamber space 329. For example, the molten material 405 is in a molten state extending along the bottom surface 327a. After the rotor 300 starts to rotate, the molten material 405 is likely to deform due to centrifugal force and move toward the outer peripheral wall surface 327b. For example, as shown in FIG. 12, the molten material 405 assumes a shape extending along the outer peripheral wall surface 327b. The operator adjusts the rotation speed and duration of the rotor 300 so that the center of the molten material 405 is as close as possible to the outer peripheral wall surface 327b. For example, the operator adjusts the rotation of the rotor 300 so that the center position of the molten material 405 coincides with the calculation result of step P107.

[0110] In step P110, a worker solidifies the molten material 405. The worker solidifies the molten material 405 while maintaining rotation of the rotor 300. For example, as shown in FIG. 13 , the worker solidifies the molten material 405 using a solidification device 430. The solidification device 430 is a device for solidifying the molten material 405. For example, the solidification device 430 can harden the molten material 405 by irradiating the molten material 405 with ultraviolet light. If the molten material 405 is thermosetting, the solidification device 430 may harden the molten material 405 by applying heat to the molten material 405. If the molten material 405 is room-temperature hardening, the solidification device 430 may harden the molten material 405 by blowing cold air onto the molten material 405.

[0111] The worker solidifies the molten material 405 to form the adjusting part 400 in the chamber space 329. The adjusting part 400 is bonded to the chamber surface 327 by solidifying the molten material 405 while in contact with the chamber surface 327. That is, the adjusting part 400 is bonded to the base part 315 by welding the adjusting part 400 to the base part 315. Step P110 corresponds to a solidification step.

[0112] In steps P109, P111, and P112, the worker performs an acquisition operation to acquire the rotational balance of the rotor 300, similar to steps P104 to P106 described above. Steps P109, P111, and P112 correspond to acquisition steps. In steps P109, P111, and P112, the rotational balance acquisition operation is performed after the adjustment unit 400 is provided on the rotor 300. In other words, the rotational balance is acquired after the rotational balance of the rotor 300 is adjusted. Steps P109, P111, and P112 correspond to post-processing steps.

[0113] In step P111, similar to step P105, the worker measures the rotational balance of rotor 300. Step P111 corresponds to a measurement step. In step P112, similar to step P106, the worker stops the rotation of rotor 300.

[0114] In step P113, the worker determines whether the rotor 300 is unbalanced. For example, if the rotational balance of the rotor 300 is not within the allowable range, the worker determines that the rotational balance of the rotor 300 is poor and that the rotor 300 is unbalanced. The rotor 300 may be unbalanced if the vector quantity of U in the above formula F1 is not zero or if the vector quantity of U is greater than the allowable value. The worker repeats steps P107 to P112 until the unbalance of the rotor 300 is resolved. If the rotor 300 is not unbalanced, the worker removes the rotor 300 from the adjustment device 410 in step P114.

[0115] According to the present embodiment described so far, the adjustment unit 400 is joined to the base unit 315 in the chamber space 329. With this configuration, only the amount of adjustment unit 400 necessary for the rotational balance of the rotor 300 can be provided on the base unit 315. That is, the rotational balance of the rotor 300 can be achieved by positive balance adjustment. With positive balance adjustment, the excess portion of the adjustment unit 400 that does not contribute to the rotational balance of the rotor 300 is unlikely to be applied to the rotor 300. Therefore, the weight of the rotor 300 can be reduced while maintaining the rotational balance of the rotor 300.

[0116] For example, consider a case where the rotational balance of rotor 300 is adjusted by a minus balance adjustment, unlike the present embodiment. For example, in a configuration in which a machined portion is provided on base portion 315 as a weight for balancing rotor 300, the rotational balance of rotor 300 is adjusted by removing a predetermined amount of the machined portion by cutting or the like. When the minus balance adjustment is completed, the machined portion remaining on base portion 315 is likely to include not only the portion that balances the rotation but also an excess portion that does not contribute to the rotational balance. For this reason, there is a concern that the weight of rotor 300 may be greater in a minus balance adjustment than in a plus balance adjustment.

[0117] Furthermore, in a configuration in which the machinable portion is formed using a fibrous material such as CFRP, there is a concern that the strength of the base portion 315 and the shape of the machined surface may become unstable due to the relationship between the fiber orientation and the cutting direction. Furthermore, there is a risk of problems, such as the tools used to machine the base portion 315 becoming easily damaged. Furthermore, with negative balance adjustment, there is a concern that the machineable portion may be insufficient. In this case, there is a concern that the accuracy of adjusting the rotational balance of the rotor 300 may decrease, and that expanding the machined portion of the base portion 315 may result in a decrease in the strength and performance of the rotor 300. In an axial motor, rotational balance is extremely important from the perspective of accurately controlling motor output. However, with negative balance adjustment, the degree of freedom in adjusting the rotational balance is often limited, such as the range of rotational balance adjustment being limited to a range that does not result in a decrease in strength or performance.

[0118] In contrast, in this embodiment, the rotational balance of the rotor 300 is adjusted by a positive balance adjustment in which the molten material 405 is injected into the holder chamber 326, thereby increasing the degree of freedom in adjusting the rotational balance. Also, because it is possible to inject only a minimum amount of molten material 405 into the holder chamber 326, the impact on the weight of the rotor 300 can be reduced. Furthermore, since it is not necessary to provide a cutting-machinable portion in the base portion 315, the structure of the rotor 300 can be simplified. Furthermore, since it is not necessary to cut the base portion 315, it is easy to use a material that is not suitable for cutting, such as CFRP, or a lightweight material, to form the base portion 315.

[0119] According to this embodiment, the holder chamber 326 is configured so that the adjustment portion 400 is surrounded on all sides by the outer peripheral wall surface 327b, the inner peripheral wall surface 327c, and the side wall surface 327d. Therefore, the outer peripheral wall surface 327b, the inner peripheral wall surface 327c, and the side wall surface 327d can prevent the adjustment portion 400 from scattering from the holder chamber 326 in the circumferential direction CD or the radial direction RD. Furthermore, in the manufacturing process of the rotor 300, the outer peripheral wall surface 327b, the inner peripheral wall surface 327c, and the side wall surface 327d can prevent the molten material 405 injected into the holder chamber 326 from flowing out of the chamber space 329.

[0120] According to this embodiment, at least a portion of base portion 315 is formed to include CFRP. Since the rotational balance of rotor 300 is adjusted by a positive balance adjustment that does not require grinding base portion 315, the weight of rotor 300 can be reduced by using CFRP, which is difficult to grind, to form base portion 315. Furthermore, the lightweight nature of CFRP makes it possible to implement a simple method of balance adjustment using molten material 405, which is a liquid adhesive.

[0121] According to this embodiment, a plurality of chamber spaces 329 are arranged in the circumferential direction CD in the base portion 315. In this configuration, the plurality of chamber spaces 329 can increase the degree of freedom regarding the position at which the adjustment portion 400 is installed. Therefore, the accuracy of adjusting the rotational balance of the rotor 300 can be increased.

[0122] In this embodiment, since a plurality of chamber spaces 329 are provided in the base portion 315, the adjustment portion 400 can be disposed in at least two of the chamber spaces 329. Therefore, for example, by making the weight of the adjustment portion 400 different in the at least two chamber spaces 329, the rotational balance of the rotor 300 can be achieved.

[0123] According to this embodiment, the adjustment unit 400 is joined to the base unit 315 by welding the adjustment unit 400 to the base unit 315. With this configuration, it is not necessary to use a separate member such as double-sided tape or screws to join the adjustment unit 400 to the base unit 315. This prevents the weight of a separate member from causing the rotational balance of the rotor 300 to be disrupted. In this way, since it is not necessary to use a separate member to join the adjustment unit 400 to the base unit 315, the precision of the rotational balance adjustment can be improved. For example, since the molten material 405 itself is used as the adjustment unit 400, easy and highly precise balance adjustment can be achieved.

[0124] According to this embodiment, the adjustment unit 400 is joined to the outer peripheral wall surface 327b in the chamber space 329. In this configuration, the outer peripheral wall surface 327b restricts the adjustment unit 400 from moving outward. Therefore, the outer peripheral wall surface 327b can prevent the adjustment unit 400 from scattering outward from the chamber space 329.

[0125] Furthermore, with this configuration, the adjustment unit 400 can be biased toward the outer peripheral wall surface 327b in the radial direction RD. Therefore, the position of the adjustment unit 400 in the chamber space 329 can be determined by the outer peripheral wall surface 327b. Therefore, it is possible to prevent the position of the adjustment unit 400 in the chamber space 329 from varying among the multiple chamber spaces 329. This minimizes the effect of the positional variation of the adjustment unit 400 on the rotational balance of the rotor 300.

[0126] In the rotor 300, the farther the position of the adjustment unit 400 is from the motor axis Cm, the lighter the adjustment unit 400 can be to maintain rotational balance of the rotor 300. In contrast, according to this embodiment, the adjustment unit 400 is located closer to the outer peripheral wall surface 327b, so the adjustment unit 400 can be disposed as far away as possible from the motor axis Cm in the radial direction RD in the chamber space 329. This reduces the weight of the adjustment unit 400 required to maintain rotational balance of the rotor 300. Therefore, the position of the adjustment unit 400 can reduce the weight of the rotor 300. In addition, in this case, the molten material 405 used to form the adjustment unit 400 can be saved.

[0127] According to this embodiment, in an axial gap motor 61 in which the rotor 300 and the stator 200 are aligned in the axial direction AD, the adjustment unit 400 is provided at a position spaced apart in the radial direction RD from the magnet 310. In this configuration, the holder chamber 326 and the adjustment unit 400 can be placed in positions where the magnetic flux generated by the magnet 310 and the coil 64 is unlikely to reach. This makes it possible to realize a configuration in which the magnetic characteristics of the motor 61 are less susceptible to the influence of balance adjustment by the adjustment unit 400.

[0128] According to this embodiment, the adjustment unit 400 is provided in the axial gap motor 61 at a position away from the magnet 310 on the inner circumferential side. With this configuration, there is no need to provide the adjustment unit 400 on the outer circumferential side of the magnet 310, and therefore the base unit 315 can be made smaller in the radial direction RD. For example, in the axial gap motor 61, the output torque tends to increase the farther the magnet 310 is positioned in the radial direction RD from the motor axis Cm. Therefore, by providing the magnet 310 on the outer circumferential side of the base unit 315 and providing the adjustment unit 400 on the inner circumferential side of the magnet 310, the output torque can be increased while the size of the rotor 300 can be reduced.

[0129] According to this embodiment, in the radial direction RD, a chamber space 329 is provided between the motor axis Cm and the magnet 310. Therefore, the chamber space 329 and the holder chamber 326 can be used as a reinforcing portion for increasing the strength of the rotor 300, in addition to being used as an installation target for the adjustment portion 400. For example, the rotor 300 can be reinforced by filling the chamber space 329 with a reinforcing member.

[0130] According to this embodiment, the height dimension D4 of the chamber space 329 is larger than the height dimension D3 of the magnet 310. With this configuration, the chamber space 329 can be made as large as possible in the axial direction AD. Therefore, the chamber space 329 serves as a lightening portion, thereby achieving a reduction in the weight of the rotor 300. Furthermore, the chamber space 329 is configured to span the magnet 310 and the coil portion 211 in the axial direction AD so as not to affect the thickness dimension of the axial gap 305. Therefore, by providing the adjustment unit 400 in the chamber space 329, it is possible to optimize all of the balance adjustment of the rotor 300, the reinforcement of the rotor 300, and the management of the axial gap 305.

[0131] According to this embodiment, the first rotor 300A is provided such that the first base portion 315A covers the second adjustment portion 400B via the second chamber opening 328B. Therefore, even if the connection between the second adjustment portion 400B and the second base portion 315B is released, the first base portion 315A can prevent the second adjustment portion 400B from scattering from the second base portion 315B. Furthermore, the second rotor 300B is provided such that the second base portion 315B covers the first adjustment portion 400A via the first chamber opening 328A. Therefore, even if the connection between the first adjustment portion 400A and the first base portion 315A is released, the second base portion 315B can prevent the first adjustment portion 400A from scattering from the first base portion 315A.

[0132] For example, the first chamber space 329A and the second chamber space 329B are connected to each other to form a single space that is sealed by the first base portion 315A and the second base portion 315B. Therefore, even if the adjustment units 400A and 400B are separated from the base portions 315A and 315B, the adjustment units 400A and 400B can be prevented from scattering out of the chamber spaces 329A and 329B. This can prevent the adjustment units 400A and 400B from scattering and causing an abnormality in the motor 61.

[0133] According to this embodiment, the motor device 60 is provided in the eVTOL 10 and is driven to fly the eVTOL 10. It is thought that high performance and quality are required for the motor device 60 installed in the eVTOL 10 due to factors such as the tendency for the number of units produced to be small and the difficulty of reducing manufacturing costs. For this reason, it is thought that ease of adjusting the rotational balance is required for the motor device 60 installed in the eVTOL 10.

[0134] According to this embodiment, during the manufacturing process of the motor device 60, an operator injects molten material 405 into the chamber space 329 in accordance with the rotational balance of the rotor 300 and solidifies the molten material 405 to form the adjustment portion 400. By forming the adjustment portion 400 in this manner, the weight of the rotor 300 can be reduced while maintaining the rotational balance of the rotor 300. Furthermore, because positive balance adjustment is achieved by storing the molten material 405 in the chamber space 329, the balance adjustment process, including the injection and solidification of the molten material 405, can be performed repeatedly. Therefore, even if the rotational balance of the rotor 300 cannot be achieved by a single balance adjustment process, the rotational balance of the rotor 300 can be easily corrected by performing the balance adjustment process multiple times.

[0135] According to this embodiment, the worker measures the rotational balance of the rotor 300 while the rotor 300 is rotating. This allows the worker to accurately obtain the rotational balance of the rotor 300. This increases the accuracy of the rotational balance adjustment by the adjustment unit 400.

[0136] According to this embodiment, the operator calculates the injection amount of the molten material 405 to be injected into the chamber space 329 based on the rotation balance obtained while the rotor 300 is rotating. Therefore, the operator can accurately calculate the injection amount of the molten material 405 to be injected into the chamber space 329.

[0137] According to this embodiment, the worker calculates the injection amount of the molten material 405 for each of the multiple chamber spaces 329. Therefore, the worker can obtain both the injection amount and injection position of the molten material 405. Furthermore, since the multiple chamber spaces 329 include a chamber space 329 into which the injection amount of the molten material 405 is zero, the worker can obtain the existence of a chamber space 329 into which the molten material 405 is not injected.

[0138] According to this embodiment, the worker solidifies the molten material 405 after adjusting the shape of the molten material 405 by rotating the rotor 300. In this configuration, the shape of the molten material 405 can be adjusted by utilizing the centrifugal force generated by the rotation of the rotor 300. Therefore, when the molten material 405 is injected into a plurality of chamber spaces 329, the molten material 405 can be adjusted to approximately the same shape in each of the plurality of chamber spaces 329. Therefore, it is possible to prevent the rotational balance of the rotor 300 from being disrupted due to variations in the shapes of the molten material 405 and the adjustment unit 400 among the plurality of chamber spaces 329.

[0139] For example, it is believed that the rotational balance of the rotor 300 changes depending on the position of the molten material 405 in the chamber spaces 329. When the rotor 300 is rotated with the liquid molten material 405 placed in the chamber spaces 329, centrifugal force can easily move the molten material 405 in all of the chamber spaces 329 toward the outer peripheral wall surface 327b. Therefore, the amount of molten material 405 to be injected into each of the multiple chamber spaces 329 can be calculated on the assumption that the molten material 405 will be unevenly distributed toward the outer peripheral wall surface 327b. This makes it possible to easily and highly accurately adjust the rotational balance of the rotor 300.

[0140] According to this embodiment, the worker obtains the rotational balance of the rotor 300 both before and after the adjustment of the rotational balance of the rotor 300. In this configuration, the worker can improve the accuracy of the rotational balance adjustment by obtaining the rotational balance of the rotor 300 before the adjustment. Also, in this configuration, the worker can correct the rotational balance by obtaining the rotational balance of the rotor 300 after the adjustment. Therefore, the rotational balance of the rotor 300 can be reliably achieved.

[0141] According to this embodiment, with the rotor 300 attached to the adjustment device 410, the worker performs an acquisition operation to acquire the rotational balance, an injection operation to inject the molten material 405 into the chamber space 329, and a solidification operation to solidify the molten material 405. In this configuration, the worker can successively perform the acquisition operation, the injection operation, and the solidification operation on the same rotor 300. This reduces the workload of the worker when adjusting the rotational balance of the rotor 300.

[0142] For example, by sharing equipment such as the adjustment device 410 used for the acquisition work, injection work, and solidification work, it is possible to reduce the cost of adjusting the rotation balance. Also, since it is possible to eliminate tasks such as attaching and detaching equipment and moving the rotor 300 every time a worker changes work processes, it is easy to improve the manufacturing efficiency of the motor device 60. Furthermore, since balance measurement, injection of the molten material 405, and hardening can be performed while the rotor 300 is rotating, the injection amount of the molten material 405 can be adjusted while measuring the balance, making balance adjustment easier.

[0143] Second Embodiment In the first embodiment, the holder chamber 326 is provided on the inner circumferential side of the magnet 310. In contrast, in the second embodiment, the position where the holder chamber 326 is provided does not have to be on the inner circumferential side of the magnet 310. The configurations, actions, and effects not specifically described in the second embodiment are the same as those in the first embodiment. The second embodiment will be described mainly focusing on the differences from the first embodiment.

[0144] 14 and 15, the holder chamber 326 and the adjustment unit 400 are provided at positions spaced apart from the magnet 310 on the outer circumferential side. A plurality of the holder chambers 326 are arranged in the circumferential direction CD along the outer circumferential edge of the base unit 315. That is, the holder chambers 326 are arranged along the outer circumferential edge of the base unit 315. The magnet 310 is provided at a position spaced apart from the holder chamber 326 on the inner circumferential side. A plurality of the magnets 310 are arranged in the circumferential direction CD along the inner circumferential edge of the base unit 315.

[0145] Motor 61 may be an outer rotor type motor. As shown in Fig. 15, in motor 61, holder overlapping portion 301 is provided on the outer periphery of stator 200. For example, holder overlapping portion 301 is provided at a position spaced apart from coil portion 211 on the outer periphery side. In motor 61, magnet 310 and coil portion 211 are arranged in the axial direction AD on the inner periphery side of holder overlapping portion 301 with axial gap 305 interposed therebetween.

[0146] The stator 200 has a coil support portion 201. The coil support portion 201 supports the coil portion 211. The coil support portion 201 is accommodated in the motor housing 70 together with the coil portion 211 and the like, and is fixed to the motor housing 70 with bolts or the like. The coil support portion 201 is provided on the inner peripheral side of the coil portion 211. The coil support portion 201 is formed in a cylindrical or columnar shape from a metal material or the like, and extends in the axial direction AD. The coil portion 211 is fixed to the coil support portion 201 with an adhesive, bolts, or the like.

[0147] The bearings 350 and 360 may be fixed to the coil support portion 201. The rotor 300 is rotatably fixed to the coil support portion 201 via the bearings 350 and 360. Note that even in a configuration in which the stator 200 has the coil support portion 201, the bearings 350 and 360 may be fixed to the motor housing 70.

[0148] <Third embodiment> In the first embodiment, the holder chamber 326 is provided at a position spaced apart from the magnet 310 in the radial direction RD. In contrast, in the third embodiment, the position at which the holder chamber 326 is provided does not have to be spaced apart from the magnet 310 in the radial direction RD. The configurations, actions, and effects not specifically described in the third embodiment are the same as those in the second embodiment. The third embodiment will be described mainly focusing on the differences from the second embodiment.

[0149] 16, at least a portion of the holder chamber 326 is arranged in a position aligned with the magnet 310 in the axial direction AD. The holder chamber 326 is located away from the magnet 310 in the axial direction AD. For example, the holder chamber 326 is located away from the magnet 310 on the side of the base opposite surface 316b. The holder chamber 326 is located away from the base opposing surface 316a on the side of the base opposite surface 316b. The first holder chamber 326A and the second holder chamber 326B are located away from each other in the axial direction AD.

[0150] The base portion 315 has a chamber cover 317. The chamber cover 317 is provided so as to close the chamber opening 328. The chamber cover 317 covers the adjustment portion 400 via the chamber opening 328. The base portion 315 is fixed by bolts or the like to a portion of the holder 320 where the holder chamber 326 is formed.

[0151] <Fourth embodiment> In the fourth embodiment, any number of holder chambers 326 may be provided in the base portion 315. The configurations, actions, and effects not specifically described in the fourth embodiment are the same as those in the first embodiment. In the fourth embodiment, the differences from the first embodiment will be mainly described.

[0152] As shown in Fig. 17, for example, only three holder chambers 326 are provided in the base portion 315. For example, in the first embodiment described above, the holder chambers 326 are arranged so as to be spaced apart in the circumferential direction CD. In contrast to this, in the present embodiment, the holder chambers 326 are arranged in a positional relationship where they are sufficiently spaced apart in the circumferential direction CD. For example, the holder chambers 326 may be arranged evenly on the same circumference in the minimum number necessary to adjust the rotational balance of the rotor 300. By minimizing the number of holder chambers 326, it is possible to increase the number of areas and spaces in the base portion 315 that can be used for purposes other than balance adjustment.

[0153] <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.

[0154] In each of the above embodiments, the holder chamber 326 and the chamber space 329 may be provided in any manner in the base portion 315. For example, only one holder chamber 326 or one chamber space 329 may be provided in the base portion 315. The holder chamber 326 or the chamber space 329 may be provided so as to straddle the magnet 310 in the axial direction AD, the radial direction RD, or the circumferential direction CD.

[0155] In each of the above embodiments, the accommodation space such as the chamber space 329 may be formed in any manner in the base portion 315 as long as it accommodates the adjustment unit 400. For example, the chamber space 329 may be open toward the inner peripheral side in the radial direction RD or toward the circumferential direction CD as long as it is defined by the bottom surface 327a and the outer peripheral wall surface 327b. In other words, the holder chamber 326 may not have at least one of the inner peripheral wall surface 327c and the side wall surface 327d. Even in this configuration, in the chamber space 329, the outer peripheral wall surface 327b restricts the adjustment unit 400 from moving toward the outer peripheral side.

[0156] In each of the above embodiments, the adjustment unit 400 may be provided in any manner in the chamber space 329. The adjustment unit 400 may be joined to at least one of the bottom surface 327a, the outer peripheral wall surface 327b, the inner peripheral wall surface 327c, and the side wall surface 327d. For example, the adjustment unit 400 may be joined to each of the bottom surface 327a, the outer peripheral wall surface 327b, and the inner peripheral wall surface 327c while extending in the radial direction RD so as to span between the outer peripheral wall surface 327b and the inner peripheral wall surface 327c.

[0157] In each of the above embodiments, the adjustment unit 400 may be provided in any manner for the multiple chamber spaces 329 as long as it is provided to balance the rotation of the rotor 300. For example, the weights of the adjustment units 400 provided in at least two chamber spaces 329 may be the same or different. Furthermore, the positions of the adjustment units 400 provided in at least two chamber spaces 329 may be different. For example, in one of the two chamber spaces 329, the adjustment unit 400 may be provided closer to the outer peripheral wall surface 327b, and in the other, the adjustment unit 400 may be provided closer to the inner peripheral wall surface 327c.

[0158] In each of the above embodiments, the chamber space 329 may be open to the outside of the rotor 300. For example, in the above first embodiment, at least a portion of the chamber opening 328 in the first rotor 300A may not be covered by the second rotor 300B. Also, in the above third embodiment, at least a portion of the chamber opening 328 may not be covered by the chamber cover 317. However, in a configuration in which at least a portion of the chamber space 329 is open to the outside of the rotor 300, it is preferable that the rotor 300 be provided with a configuration that restricts the adjustment unit 400 from leaving the chamber space 329.

[0159] In each of the above embodiments, the rotor 300 may be rotating when an operator injects the molten material 405 into the chamber space 329 during the manufacturing process of the rotor 300. In this case, the operator does not need to stop the rotation of the rotor 300 after measuring the rotational balance of the rotor 300. Furthermore, the operator may stop the rotation of the rotor 300 when solidifying the molten material 405. Furthermore, the operator does not need to use a single adjustment device 410 to perform the acquisition operation of acquiring the rotational balance, the injection operation of injecting the molten material 405 into the chamber space 329, and the solidification operation of solidifying the molten material 405. That is, the operator may perform at least two of the operations, the acquisition operation, the injection operation, and the solidification operation, using separate devices.

[0160] In each of the above embodiments, the motor 61 provided with the adjustment unit 400 does not have to be a double-rotor motor. The motor 61 may have only one rotor 300, or may have three or more rotors 300. For example, the motor 61 may be a single-rotor motor having only one rotor 300. The motor 61 may also have a plurality of stators 200. For example, the motor 61 may be a double-stator motor having two stators 200.

[0161] In each of the above embodiments, the motor 61 provided with the adjustment unit 400 does not have to be an axial gap motor. For example, the motor 61 may be a radial gap motor. A radial gap motor is sometimes called a radial motor. In a radial motor, the stator 200 and the rotor 300 are aligned in the radial direction RD with a radial gap interposed between them. In a radial motor, the radial direction RD corresponds to the alignment direction, and the axial direction AD corresponds to the perpendicular direction. In a radial motor, the holder chamber 326 and the adjustment unit 400 may be positioned away from the magnet 310 in the axial direction AD. This configuration makes it difficult for magnetic flux generated by the magnet 310 and the coil 64 to reach the holder chamber 326 and the adjustment unit 400. Furthermore, at least a portion of the holder chamber 326 may be aligned with the magnet 310 in the radial direction RD.

[0162] 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.

[0163] 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.

[0164] (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.

[0165] (Technical thought 1) A rotating electric machine (60) driven by a supply of electric power, A stator (200); a rotor (300) that rotates about a rotation axis (Cm) relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; It has The balance member is joined to the base portion in the accommodation space.

[0166] (Technical thought 2) A plurality of the accommodation spaces are arranged in the circumferential direction (CD) of the rotation axis, The rotating electric machine according to Technical Idea 1, wherein the balance member is provided in at least one of the accommodation spaces.

[0167] (Technical Thought 3) The rotating electric machine according to Technical Idea 2, wherein the weights of the balance members housed in the housing spaces are different in at least two of the housing spaces.

[0168] (Technical Thought 4) The rotating electric machine according to any one of Technical Concepts 1 to 3, wherein the balance member is joined to the base portion by welding the balance member to the base portion.

[0169] (Technical Thought 5) The base portion is a restricting wall surface (327b) that defines the accommodation space from the outer periphery and restricts the balance member from moving toward the outer periphery; The rotating electric machine according to any one of Technical Concepts 1 to 4, wherein the balance member is joined to the regulating wall surface.

[0170] (Technical Thought 6) The rotor has a magnet (310) held by the base portion; A rotating electric machine described in any one of technical ideas 1 to 5, wherein the balance member is arranged at a position away from the magnet in an orthogonal direction (RD) perpendicular to the alignment direction (AD) in which the rotor and the stator are aligned.

[0171] (Technical Thought 7) the rotor has a magnet (310) held by the base portion and is provided in a position aligned with the stator in the axial direction (AD) of the rotation axis; The rotating electric machine according to any one of Technical Ideas 1 to 6, wherein the balance member is provided at a position spaced apart from the magnet on the inner circumferential side.

[0172] (Technical Thought 8) A rotating electric motor as described in Technical Idea 7, wherein the base portion forms the accommodating space so that the accommodating space is positioned away from the magnet on the inner circumferential side and so that the height dimension (D4) of the accommodating space in the axial direction is greater than the height dimension (D3) of the magnet.

[0173] (Technical Thought 9) the rotor (300A) having a first balance member (400A) that is the balance member and a first base portion (315A) that is the base portion that forms a first accommodation space (329A) that is the accommodation space, the first rotor (300A) being arranged on the stator in the axial direction (AD) of the rotation axis; the rotor having a second balance member (400B) that is the balance member and a second base portion (315B) that is the base portion that forms a second accommodation space (329B) that is the accommodation space, the second rotor (300B) being arranged in the axial direction on the first rotor via the stator; Equipped with the first rotor is provided such that the first base portion covers the second balance member through a second accommodation opening (328B) that is an opening of the second accommodation space, A rotating electric machine described in any one of technical ideas 1 to 8, wherein the second rotor is configured so that the second base portion covers the first balance member through a first accommodating opening (328A), which is an opening of the first accommodating space.

[0174] (Technical Thought 10) A stator (200); a rotor (300) that rotates relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; A manufacturing method for a rotating electric machine (60) having the following features: An acquisition step (P104 to P106, P109, P111, P112) of acquiring the rotation balance; a storing step (P108) of storing the molten material (405) in the storage space according to the obtained rotation balance; a solidification step (P110) of solidifying the molten material contained in the accommodation space to form the balance member in a state joined to the base portion in the accommodation space; A method for manufacturing a rotating electric machine comprising:

[0175] (Technical Thought 11) The obtaining step includes: a rotating step (P104, P109) of rotating the rotor; a measuring step (P105, P111) of measuring the rotation balance while rotating the rotor; It has The method for manufacturing a rotating electric machine according to Technical Idea 10, wherein the accommodation step accommodates the molten material in the accommodation space according to the measurement result of the rotational balance as the obtained result.

[0176] (Technical Thought 12) a calculation step (P107) of calculating the amount of the molten material to be accommodated in the accommodation space according to the obtained rotation balance; Equipped with The method for manufacturing a rotating electric machine according to Technical Idea 11, wherein the accommodation step accommodates the molten material in the accommodation space according to the accommodation amount as the obtained result.

[0177] (Technical Thought 13) The method for manufacturing a rotating electric machine according to Technical Idea 12, wherein the calculation step calculates the storage capacity for each of the plurality of storage spaces formed by the base portion.

[0178] (Technical Thought 14) a shaping step (P109) of shaping the molten material by rotating the rotor before the molten material contained in the containing space solidifies; Equipped with 14. The method for manufacturing a rotating electric machine according to any one of Technical Ideas 10 to 13, wherein the solidifying step solidifies the molten material after adjusting the shape of the molten material.

[0179] (Technical Thought 15) The obtaining step includes: a preliminary step (P104 to P106) of obtaining the rotational balance before the balance member is installed in the accommodation space; a post-process (P109, P111, P112) of obtaining the rotational balance after the balance member is installed in the accommodation space; 15. A method for manufacturing a rotating electric machine according to any one of Technical Ideas 10 to 14.

[0180] (Technical Thought 16) a mounting step (P103) of mounting the base part on a rotation device (410) for rotating the base part, The method for manufacturing a rotating electric machine according to any one of Technical Ideas 10 to 15, wherein the obtaining step, the accommodating step, and the solidifying step are performed in a state where the base portion is attached to the rotating device. [Explanation of symbols]

[0181] 60...motor device, 200...stator, 300...rotor, 300A...first rotor, 300B...second rotor, 310...magnet, 315...base portion, 315A...first base portion, 315B...second base portion, 327b...outer peripheral wall surface, 328A...first chamber opening, 328B...second chamber opening, 329...chamber space, 329A...first chamber space, 329B...second chamber space, 400...adjustment portion, 400A...first adjustment portion, 400B...second adjustment portion, 410...adjustment device, D3, D4...height dimension, Cm...motor axis, AD...axial direction, CD...circumferential direction, RD...radial direction, P104 to P112...processes.

Claims

1. A rotating electric machine (60) driven by a supply of electric power, A stator (200); A rotor (300) that rotates about a rotation axis (Cm) relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; It has The balance member is joined to the base portion in the accommodation space.

2. A plurality of the accommodation spaces are arranged in the circumferential direction (CD) of the rotation axis, The rotating electric machine according to claim 1 , wherein the balance member is provided in at least one of the accommodation spaces.

3. The rotating electric machine according to claim 2 , wherein the weights of the balance members housed in the housing spaces are different in at least two of the housing spaces.

4. 4. The rotating electric machine according to claim 1, wherein the balance member is joined to the base portion by welding the balance member to the base portion.

5. The base portion is a restricting wall surface (327b) that partitions the accommodation space from the outer periphery and restricts the balance member from moving toward the outer periphery, 4. The rotating electric machine according to claim 1, wherein the balance member is joined to the restricting wall surface.

6. the rotor has a magnet (310) held by the base; The rotating electric machine according to any one of claims 1 to 3, wherein the balance member is provided at a position away from the magnet in an orthogonal direction (RD) perpendicular to the alignment direction (AD) in which the rotor and the stator are aligned.

7. The rotor has a magnet (310) held by the base portion and is provided in a position aligned with the stator in the axial direction (AD) of the rotation axis, 4. The rotating electric machine according to claim 1, wherein the balance member is provided at a position spaced apart from the magnet on the inner circumferential side.

8. 8. The rotating electric machine according to claim 7, wherein the base portion forms the accommodating space so that the accommodating space is positioned away from the magnet on the inner circumferential side and so that a height dimension (D4) of the accommodating space in the axial direction is greater than a height dimension (D3) of the magnet.

9. the rotor having a first balance member (400A) that is the balance member and a first base portion (315A) that is the base portion that forms a first accommodation space (329A) that is the accommodation space, the first rotor (300A) being arranged on the stator in the axial direction (AD) of the rotation axis; the rotor having a second balance member (400B) that is the balance member and a second base portion (315B) that is the base portion that forms a second accommodation space (329B) that is the accommodation space, the second rotor (300B) being arranged in the axial direction on the first rotor via the stator; Equipped with the first rotor is provided such that the first base portion covers the second balance member via a second accommodation opening (328B) that is an opening of the second accommodation space, The rotating electric machine according to any one of claims 1 to 3, wherein the second rotor is configured so that the second base portion covers the first balance member through a first accommodation opening (328A), which is an opening of the first accommodation space.

10. A stator (200); a rotor (300) that rotates relative to the stator; Equipped with The rotor is a balance member (400) provided to balance the rotor while it is rotating; a base portion (315) that forms an accommodation space (329) that accommodates the balancing member and supports the balancing member; A manufacturing method for manufacturing a rotating electric machine (60) having the following: an acquisition step (P104 to P106, P109, P111, P112) of acquiring the rotation balance; a containing step (P108) of containing a molten material (405) in a molten state in the containing space according to the obtained result of the rotation balance; a solidification step (P110) of solidifying the molten material contained in the accommodation space to form the balance member in a state joined to the base portion in the accommodation space; A method for manufacturing a rotating electric machine comprising:

11. The obtaining step includes: a rotating step (P104, P109) of rotating the rotor; a measurement step (P105, P111) of measuring the rotation balance while rotating the rotor; It has The method for manufacturing a rotating electric machine according to claim 10 , wherein the containing step contains the molten material in the containing space in accordance with a measurement result of the rotational balance as the acquired result.

12. a calculation step (P107) of calculating the amount of the molten material to be accommodated in the accommodation space according to the obtained rotation balance; Equipped with The method for manufacturing a rotating electric machine according to claim 11 , wherein the storing step stores the molten material in the storage space in accordance with the storage amount as the acquired result.

13. The method for manufacturing a rotating electric machine according to claim 12 , wherein the calculation step calculates the accommodation capacity for each of the plurality of accommodation spaces formed by the base portion.

14. a shaping step (P109) of shaping the molten material by rotating the rotor before the molten material contained in the containing space solidifies; Equipped with 14. The method for manufacturing a rotating electric machine according to claim 10, wherein the solidifying step solidifies the molten material after adjusting the shape of the molten material.

15. The obtaining step includes: a preliminary step (P104 to P106) of obtaining the rotational balance before the balance member is installed in the accommodation space; a post-process (P109, P111, P112) of obtaining the rotational balance after the balance member is installed in the accommodation space; The method for manufacturing a rotating electric machine according to any one of claims 10 to 13, further comprising:

16. a mounting step (P103) of mounting the base part on a rotation device (410) for rotating the base part, The method for manufacturing a rotating electric machine according to any one of claims 10 to 13, wherein the obtaining step, the accommodating step, and the solidifying step are performed in a state where the base portion is attached to the rotating device.

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