JP2012065499A - Vehicle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle motor which prevents the size increase of the entire structure of the motor.SOLUTION: A motor includes a shaft 14 rotatably supported by a motor housing (motor case) 11, a magnetic steel plate part (iron core) 16 rotating integrally with the shaft 14 and having magnetism, and a stator 12 enclosing the magnetic steel plate part 16 and around which a coil K is wound. An insulation part (spider) 15 is provided between the shaft 14 and the magnetic steel plate part 16 to insulate a space therebetween.

Description

  The present invention relates to a vehicle motor that includes an electromagnetic steel plate portion that rotates integrally with a shaft and is mounted as a drive source in a hybrid vehicle or an electric vehicle.

  2. Description of the Related Art Conventionally, among motor shafts that are driven to rotate by an inverter, a vehicle motor provided with a sliding brush that is electrically connected to a vehicle body at the end of a shaft that extends to the opposite side of the power transmission mechanism across the rotor. Is known (see, for example, Patent Document 1).

JP 2006-320129 A

  However, in the conventional vehicle motor, the motor drive system does not function as an antenna for high frequency noise by grounding the shaft to the vehicle body via the sliding brush, and although it can take measures against radio noise, it is not a functional component of the vehicle motor. It is necessary to connect the sliding brush. That is, it is necessary to install a sliding brush as a separate part, and there is a problem that the entire structure of the motor is increased by the amount of the brush installation space.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a vehicle motor that can suppress an increase in the overall structure of the motor.

  In order to achieve the above object, in the vehicle motor of the present invention, a shaft that is rotatably supported by the motor housing, a magnetic steel plate portion having magnetism that can rotate integrally with the shaft, a magnetic steel plate portion that surrounds the magnetic steel plate portion, and a coil is wound. And an insulating portion that insulates between the shaft and the electromagnetic steel plate portion.

In the vehicle motor of the present invention, the insulating portion isolates the shaft rotatably supported by the motor housing and the electromagnetic steel plate portion that can rotate integrally with the shaft.
That is, an electrical circuit generated between the shaft and the electromagnetic steel plate is blocked by the insulating portion. For this reason, an electric current does not flow between a shaft and a magnetic steel sheet part, and the high frequency noise which generate | occur | produces when supplying electric power to a coil does not generate | occur | produce. This eliminates the need for a sliding brush that is not a functional component for grounding the shaft. As a result, it is not necessary to secure a brush installation space, and an increase in the size of the entire motor structure can be suppressed.

It is a longitudinal cross-sectional view which shows the in-wheel motor to which the motor for vehicles of Example 1 is applied. It is the equivalent circuit schematic in the motor for vehicles of a comparative example. FIG. 3 is an equivalent circuit diagram of the vehicle motor according to the first embodiment. It is a longitudinal cross-sectional view which shows the motor for vehicles of Example 2. FIG. It is a longitudinal cross-sectional view which shows the 1st modification of the motor for vehicles of Example 2. FIG. It is a longitudinal cross-sectional view which shows the 2nd modification of the motor for vehicles of Example 2. FIG. FIG. 6 is a longitudinal sectional view showing a vehicle motor according to a third embodiment. FIG. 10 is a longitudinal sectional view showing a first modification of the vehicle motor according to the third embodiment. It is a longitudinal cross-sectional view which shows the motor for vehicles of Example 4. FIG. FIG. 10 is a longitudinal sectional view showing a first modification of the vehicle motor according to the fourth embodiment. (a) is a principal part enlarged view which shows the 1st modification of the vehicle motor of Example 1, (b) is a principal part enlarged view which shows the 2nd modification of the vehicle motor of Example 1. is there.

  Hereinafter, the best mode for realizing the vehicle motor of the present invention will be described based on Examples 1 to 4 shown in the drawings.

First, the configuration will be described.
FIG. 1 is a longitudinal sectional view showing an in-wheel motor to which the vehicle motor according to the first embodiment is applied.

  The vehicle motor 10 in the first embodiment is applied to an in-wheel motor IM that is disposed in an inner space region of a road wheel 1 of a driving wheel of an electric vehicle and serves as a driving source of the electric vehicle.

  The in-wheel motor IM includes a vehicle motor 10, a speed reduction mechanism 20, and a brake mechanism 30.

  The vehicle motor 10 is a synchronous motor, and includes a motor case (motor housing) 11, a stator 12, and a rotor 13.

  The motor case 11 is a case having a sealed space in which the stator 12 and the rotor 13 are housed. The motor case 11 includes a case main body 11a and a lid 11b that fits the opening end of the case main body 11a and holds the inside in a sealed state. The motor case 11 is fixed to a vehicle body (not shown) via a bolt (not shown) at a fixing portion 11c formed on the case main body 11a. In addition, lubricating oil is supplied into the motor case 11 from an oil pump OP attached to the outside of the lid 11b.

  The stator 12 surrounds the rotor 13 through a slight air gap and winds the three-phase coil K. The stator 12 has a cylindrical shape with a space inside, and an outer peripheral surface is fixed to the inside of the case body 11a.

  The rotor 13 includes a shaft 14, a spider 15, and an iron core (magnetic steel plate part) 16.

  One end 14b of the shaft 14 is rotatably held by the lid 11b via the first bearing BRG1, and the other end 14c is rotatably connected to the output shaft 25 of the speed reduction mechanism 20 via the second bearing BRG2. Yes. As a result, the shaft 14 is rotatably supported by the motor case 11. An oil passage 14d that penetrates in the axial direction is formed at the center of the shaft 14.

  The spider 15 is fixed to the fixed portion 14a of the shaft 14 and rotates integrally with the shaft 14, and the iron core 16 is held on the outer peripheral surface 15c. As a result, the spider 15 connects the shaft 14 and the iron core 16, and transmits the rotational torque generated according to the rotating magnetic field generated by supplying AC power to the coil K from the iron core 16 to the shaft 14. The spider 15 is formed of an insulating material having an insulating property, and serves as an insulating portion that insulates between the shaft 14 and the iron core 16. The insulating material is a synthetic resin material such as polyester or epoxy resin. And this spider 15 has the cylindrical part 15a and the connection part 15b.

  The cylindrical portion 15a surrounds the outer periphery of the shaft 14, and holds a plurality of iron cores 16,... At equal intervals in the circumferential direction on the outer peripheral surface 15c. The connecting portion 15b connects the inner surface of the cylindrical portion 15a and the shaft 14 and is fixed to the fixing portion 14a via a plurality of fixing screws N1,.

  The iron core 16 is formed by laminating a large number of magnetic plates along the axial direction of the shaft 14. The iron core 16 is held on the outer peripheral surface 15c of the spider 15 with both end portions in the axial direction sandwiched between end plates 16a and 16b.

  The speed reduction mechanism 20 is connected to the shaft 14 of the rotor 13 through an opening formed in the central portion of the case main body 11a. Here, the speed reduction mechanism 20 uses a planetary gear mechanism, and a sun gear 21 formed on the shaft 14, a ring gear 22 fixed to the case body 11 a, a small pinion that meshes with the sun gear 21, and a large gear that meshes with the ring gear 22. A plurality of stepped pinion gears 23,... Comprising a pinion, a carrier 24 that rotatably supports the plurality of stepped pinion gears 23,... Via a third bearing BRG3, and a fourth bearing formed integrally with the carrier 24. And an output shaft 25 that is rotatably supported by the case main body 11a via BRG4. Here, the output shaft 25 is arranged coaxially with the shaft 14 and is connected to be mutually rotatable via the second bearing BRG2.

  The brake mechanism 30 appropriately applies a braking force to the tire T that is rotationally driven by the vehicle motor 10. The brake mechanism 30 includes a brake drum 31 fixed to the output shaft 25, a brake shoe 32 that sandwiches the brake drum 31 from both sides, and a brake cylinder 33 that drives the brake shoe 32 by hydraulic pressure. Reference numeral 34 denotes a cover for preventing dirt such as mud from adhering to the brake drum 31.

  The road wheel 1 includes a rim 2 on which the tire T is mounted, and a disk 3 that is integrally connected to the rim 2. An output shaft 25 is fixed at the center of the disk 3, and the road wheel 1 and the tire T rotate integrally with the output shaft 25 rotated by the vehicle motor 10.

Next, the operation will be described.
First, “radio noise generation mechanism and countermeasure” will be described, and then the operation of the vehicle motor of the first embodiment will be described separately as “radio noise reduction operation” and “separate parts unnecessary operation”.

[Radio noise generation mechanism and countermeasures]
FIG. 2 is an equivalent circuit diagram of the vehicle motor of the comparative example.

  Usually, the vehicle motor 10 rotates the rotor 13 having the iron core 16 at a desired rotational speed together with the shaft 14 by a rotating magnetic field generated by supplying power to the coil K wound around the stator 12. At this time, a current flowing from the iron core 16 → the spider 15 → the shaft 14 → the first bearing BRG 1 → the motor case 11 → the second bearing BRG 2 → the shaft 14 is generated by the voltage induced from the stator 12 side. For this reason, when the entire current path acts as an antenna, high-frequency noise is radiated to the outside, which is a cause of so-called radio noise that adversely affects on-vehicle electronic components and radio reception.

  Therefore, in the vehicle motor of the comparative example, the output shaft SFT2 rotated by the rotor shaft SFT1 is provided with a ground sliding brush BR, and the output shaft SFT2 and the motor case MK are electrically connected to make the potential equal. It is considered to be. Thereby, induction of voltage from the stator (winding) side is suppressed, and as a result, radio noise is reduced.

  However, in order to install the sliding brush BR, it is necessary to secure a brush installation space, which causes a problem that the overall structure of the vehicle motor is increased. In addition, the installation of the sliding contact brush BR that is not a motor functional component increases the number of components and increases the cost. Furthermore, since the sliding contact brush BR is a consumable item, maintenance management is required and management costs may be increased, and further problems such as durability of the sliding contact brush BR and generation of dust may occur.

  In addition, it is conceivable to insulate the first to fourth bearings BRG1 to BRG4 and their surroundings that rotatably hold the shaft SFT1 and the output shaft SFT2, but the current passing through other circuits such as the parts in contact with the gears is considered. There is a possibility that the noise cannot be reduced because it cannot be blocked. In addition, it is necessary to use a special bearing having insulating properties, and there is a problem that the cost increases.

[Radio noise reduction effect]
FIG. 3 is an equivalent circuit diagram of the vehicle motor according to the first embodiment.

  In the vehicle motor 10 according to the first embodiment, when electric power is supplied to the coil K wound around the stator 12, a rotating magnetic field is generated, and the rotor 13 having the iron core 16 rotates together with the shaft 14 at a desired number of rotations. At this time, a voltage is induced from the stator 12 side. However, in the vehicle motor 10 of the first embodiment, since the spider 15 is formed of an insulating material having an insulating property, the iron core 16 and the shaft 14 are insulated from each other. Is done. That is, the spider 15 made of an insulating material functions as an insulating portion that insulates between the shaft 14 and the iron core 16.

  As a result, the circuit connected to the iron core 16 → the spider 15 → the shaft 14 → the first bearing BRG1 → the motor case 11 → the fourth bearing BRG4 → the output shaft 25 → the second bearing BRG2 → the shaft 14 is cut off. For this reason, no current flows through the motor drive system, so that it does not function as an antenna for high frequency noise, and radio noise can be reduced.

[No need for separate parts]
In the vehicle motor 10 according to the first embodiment, as described above, the spider 15 is formed of an insulating material, so that the circuit is interrupted and no current flows to reduce radio noise.

  Here, the spider 15 connects the shaft 14 and the iron core 16 to transmit rotational torque. That is, it is a functional component of the vehicle motor 10. Therefore, the vehicle motor 10 according to the first embodiment is configured to block the circuit using the spider 15 that is a functional component. As a result, the radio noise can be reduced without increasing the number of components other than the functional components, so that no separate components are required, and an increase in the size of the entire motor structure can be suppressed.

  In particular, in the vehicle motor 10 according to the first embodiment, since the spider 15 formed of an insulating material is used as the insulating portion, radio noise can be reduced by cutting off the circuit without incurring costs.

Next, the effect will be described.
In the vehicle motor according to the first embodiment, the following effects can be obtained.

(1) A shaft 14 rotatably supported by a motor housing (motor case) 11, an electromagnetic steel plate part (iron core) 16 having magnetism that can rotate integrally with the shaft 14, and the electromagnetic steel plate part 16 are surrounded by a coil. The stator 12 is wound around K, and an insulating portion that insulates between the shaft 14 and the electromagnetic steel plate portion 16.
For this reason, it is not necessary to install components other than the functional components for reducing radio noise, and an increase in the size of the entire motor structure can be suppressed.

(2) The insulating portion is a spider 15 that is fixed to the shaft 14 and rotates integrally with the shaft 14, holds the electromagnetic steel plate portion (iron core) 16, and is formed of an insulating material having an insulating property. It was.
For this reason, it is possible to cut down the circuit without cost and reduce radio noise.

The motor for vehicles of Example 2 is an example which insulated between a shaft and an electromagnetic steel plate part by the insulating layer provided in the outer surface of a spider.

First, the configuration will be described. In addition, about the part same as the motor 10 for vehicles demonstrated in Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 4 is a longitudinal sectional view illustrating the vehicle motor according to the second embodiment.

  In the vehicle motor 10A according to the second embodiment, the spider 15A is formed of a metal material, and an insulating process is performed on the outer surface thereof to provide an insulating layer 15d having insulating properties. Here, the insulating treatment is, for example, coating the surface of the spider with resin or varnish.

  Thereby, the insulating layer 15d becomes an insulating portion that insulates between the shaft 14 and the iron core 16, and the iron core 16 and the shaft 14 are insulated. As a result, when power is supplied to the coil K wound around the stator 12 and the rotor 13 is rotationally driven, even if a voltage is induced from the stator 12 side, the iron core 16 → spider 15A → shaft 14 → first bearing BRG1 → The circuit connected to the motor case 11 → second bearing BRG2 → shaft 14 is cut off, current does not flow, and radio noise can be reduced.

  On the other hand, since spider 15A is formed of a metal material, it is possible to reduce costs and improve rotor strength.

Next, the effect will be described.
In the vehicle motor according to the second embodiment, the following effects can be obtained.

(3) The insulating portion is an insulating layer 15d having an insulating property provided on the outer surface of a spider 15A that is fixed to the shaft 14 and rotates integrally with the shaft 14 and holds the electromagnetic steel plate portion (iron core) 16. A certain configuration was adopted.
For this reason, spider 15A itself can be formed with a metal material, and while reducing cost, the intensity | strength of the rotor 13 can be improved.

  In the vehicle motor 10A shown in FIG. 4, the entire spider 15A is insulated and the insulating layer 15d is provided over the entire outer surface of the spider 15A. However, the present invention is not limited to this.

  For example, as shown in FIG. 5, the insulating layer 15d may be provided only on the outer peripheral surface 15c of the cylindrical portion 15a of the spider 15A, which is a portion where the spider 15A and the iron core 16 are in contact. That is, only the iron core contact portion of the spider 15A is insulated. Even in this case, the iron core 16 and the shaft 14 can be insulated. Further, by providing the insulating layer 15d only on the outer peripheral surface 15c of the cylindrical portion 15a, the area for providing the insulating layer 15d can be reduced, and the cost can be reduced.

  Further, as shown in FIG. 6, an insulating layer 15d may be provided only on the connecting portion 15b of the spider 15A, which is a portion where the spider 15A and the shaft 14 are in contact with each other. That is, only the shaft contact portion of the spider 15A is insulated. Even in this case, it is possible to insulate between the iron core 16 and the shaft 14 by the insulating layer 15d. Further, by providing the insulating layer 15d only in the connecting portion 15b, the area for providing the insulating layer 15d can be reduced, and the cost can be reduced. In this case, the fixing screw N1 is formed of an insulating material.

The vehicle motor of Example 3 is an example in which the shaft and the electromagnetic steel plate portion are insulated from each other by an insulating layer provided on the outer surface of the shaft.

First, the configuration will be described. In addition, about the part same as the motors 10 and 10A for vehicles demonstrated in Example 1 and Example 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 7 is a longitudinal sectional view illustrating the vehicle motor according to the third embodiment.

  In the vehicle motor 10B according to the third embodiment, the shaft 14B is formed of a metal material, and an insulating process is performed on the outer surface thereof, thereby providing an insulating layer 14e having insulating properties. Here, the insulation treatment is to coat the shaft surface with, for example, a resin or varnish. At this time, the fixing screw N1 for fixing the spider 15 to the shaft 14B is formed of an insulating material.

  Thereby, the insulating layer 14e becomes an insulating part which insulates between the shaft 14B and the iron core 16, and the iron core 16 and the shaft 14B are insulated. As a result, when power is supplied to the coil K wound around the stator 12 and the rotor 13 is driven to rotate, even if a voltage is induced from the stator 12 side, the iron core 16 → the spider 15 → the shaft 14B → the first bearing BRG1 → The circuit connected to the motor case 11 → second bearing BRG2 → shaft 14B is cut off, current does not flow, and radio noise can be reduced.

  On the other hand, since the shaft 14B is made of a metal material, the cost can be reduced and the rotor strength can be improved.

Next, the effect will be described.
In the vehicle motor according to the third embodiment, the following effects can be obtained.

(4) The insulating part is an insulating layer 14e having an insulating property provided on the outer surface of the shaft 14B.
For this reason, shaft 14B itself can be formed with a metal material, and while reducing cost, the intensity | strength of the rotor 13 can be improved.

  In the vehicle motor 10B shown in FIG. 7, the entire shaft 14B is insulated and the insulating layer 14e is provided over the entire outer surface of the shaft 14B. However, the present invention is not limited to this.

  For example, as shown in FIG. 8, the insulating layer 14 e may be provided only on the outer surface of the fixing portion 14 a that contacts the spider 15 among the outer surfaces of the shaft. That is, only the spider contact portion of the shaft 14B is insulated. Even in this case, the iron core 16 and the shaft 14B can be insulated. Further, by providing the insulating layer 14e only at the spider contact portion, the area where the insulating layer 14e is provided can be reduced, and the cost can be reduced. In this case, the fixing screw N1 is formed of an insulating material.

The vehicle motor of Example 4 is an example in which the shaft and the electromagnetic steel plate portion are insulated by an insulator provided at the contact portion between the shaft, the spider, and the electromagnetic steel plate portion.

First, the configuration will be described. In addition, the same code | symbol is attached | subjected about the part same as the vehicle motors 10, 10A, 10B demonstrated in Example 1- Example 3, and the description is abbreviate | omitted.
FIG. 9 is a longitudinal sectional view showing the vehicle motor according to the fourth embodiment.

  In the vehicle motor 10 </ b> C according to the fourth embodiment, an insulator 17 having an insulating property is interposed between the spider 15 and the iron core 16. Here, the insulator 17 is formed separately from the spider 15 and the iron core 16 by a synthetic resin material such as polyester or epoxy resin. The insulator 17 is pressed and fixed by the end plates 16a and 16b.

  Thereby, the insulator 17 becomes an insulating part which insulates between the shaft 14 and the iron core 16, and the iron core 16 and the shaft 14 are insulated. As a result, when power is supplied to the coil K wound around the stator 12 and the rotor 13 is rotationally driven, even if a voltage is induced from the stator 12 side, the iron core 16 → the spider 15 → the shaft 14 → the first bearing BRG1 → The circuit connected to the motor case 11 → second bearing BRG2 → shaft 14 is cut off, current does not flow, and radio noise can be reduced.

  On the other hand, conventional products can be used for the spider 15 and the iron core 16, and the shaft 14 and the iron core 16 can be insulated by a slight change, so that the cost can be reduced.

  In the vehicle motor 10 </ b> C shown in FIG. 9, the insulator 17 is interposed between the spider 15 and the iron core 16, but this is not a limitation.

  For example, an insulator 18 may be interposed between the shaft 14 and the spider 15 like a vehicle motor 10C ′ shown in FIG. In this case, the spider 15 is fixed to the shaft 14 via the insulator 18 by a fixing screw N1 formed of an insulating material. Even in this case, the iron core 16 and the shaft 14 can be insulated. At this time, the conventional shaft 14 and spider 15 can be used, and the shaft 14 and the iron core 16 can be insulated by slight changes, so that the cost can be reduced.

Next, the effect will be described.
In the vehicle motor according to the fourth embodiment, the following effects can be obtained.

(5) The insulating portion is between the shaft 14 and a spider 15 fixed to the shaft 14 and rotating integrally with the shaft 14 to hold the electromagnetic steel plate portion (iron core) 16 or the spider 15 Insulators 17 and 18 having an insulating property provided in at least one of the electromagnetic steel plate portion (iron core) 16.
For this reason, it is possible to insulate between the shaft 14 and the iron core 16 by making a small change in the motor structure, thereby reducing the cost.

  As mentioned above, although the vehicle motor of this invention has been demonstrated based on Example 1-Example 4, it is not restricted to these Examples about a concrete structure, Each claim of a claim Design changes and additions are allowed without departing from the gist of the invention.

  In the vehicle motor 10 according to the first embodiment, the iron core 16 is fixed to the spider 15 by sandwiching both end portions in the axial direction of the iron core 16 with the end plates 16a and 16b. However, the present invention is not limited thereto.

  For example, as shown in FIG. 11 (a), when the spider 15 is molded from a powder core formed by pressure-molding a powder having an electrical insulating film formed on its surface, or a resin material, an iron core 16 is formed. Both end portions in the axial direction may be sandwiched. Thereby, the spider 15 and the iron core 16 are integrated. In this case, the end plates 16a and 16b are not required, so that not only the number of parts can be reduced, but also the manufacturing process can be reduced, so that the manufacturing cost can be suppressed. Further, the connection between the spider 15 and the iron core 16 is strengthened, and the strength of the rotor 13 can be improved.

  Further, as shown in FIG. 11 (b), when the through-hole 16c penetrating in the axial direction is formed in the iron core 16 and the spider 15 is formed, both end portions in the axial direction of the iron core 16 are sandwiched and the through-hole 16c. The spider 15 may be inserted into the. In this case, the connection between the spider 15 and the iron core 16 becomes stronger than in the case shown in FIG. 11A, and the strength of the rotor can be further improved.

  Further, in the vehicle motor 10C of the fourth embodiment, an insulator 17 is provided between the spider 15 and the iron core 16, and in the vehicle motor 10C ′, an insulator 18 is provided between the shaft 14 and the spider 15. However, the insulator 17 and the insulator 18 may be used simultaneously to insulate between the shaft 14 and the spider 15 and between the spider 15 and the iron core 16 at the same time. In this case, insulation can be improved and the noise reduction effect can be further improved.

  Furthermore, in the above-described embodiment, the iron core 16 formed by laminating a large number of magnetic plates along the axial direction of the shaft 14 is used as the electromagnetic steel plate portion. However, the present invention is not limited to this. The magnetic steel sheet portion may be a compressed magnetic core in which a ferromagnetic material is made into a fine powder and the surface thereof is covered with an insulating coating and then compressed and hardened, or a field coil that generates electromagnetic force when energized. May be.

  In the above-described embodiment, an example in which the vehicle motor is applied to an in-wheel motor has been described. However, the vehicle motor is disposed in a motor room formed in an electric vehicle or a hybrid vehicle, and the left and right front wheels or the left and right rear wheels are simultaneously driven to rotate. It can also be applied as a drive motor.

10 Vehicle Motor 11 Motor Case (Motor Housing)
12 Stator 13 Rotor 14 Shaft 14a Fixed part 15 Spider 15a Cylindrical part 15b Connection part 15c Outer peripheral surface 16 Iron core (electromagnetic steel plate part)
K coil 20 deceleration mechanism 25 output shaft 30 brake mechanism
BRG1 first bearing
BRG2 2nd bearing
BRG3 3rd bearing
BRG4 4th bearing 1 Road wheel
IM in-wheel motor
OP Oil pump N1 fixing screw

Claims (5)

A shaft rotatably supported by the motor housing;
A magnetic steel sheet portion having magnetism that can rotate integrally with the shaft;
A stator that surrounds the electromagnetic steel sheet and winds a coil;
An insulating part that insulates between the shaft and the electrical steel sheet part;
A vehicle motor comprising: The vehicle motor according to claim 1,
The vehicle motor according to claim 1, wherein the insulating portion is a spider that is fixed to the shaft and rotates integrally with the shaft to hold the electromagnetic steel plate portion and is formed of an insulating material having an insulating property. The vehicle motor according to claim 1,
The vehicle motor, wherein the insulating portion is an insulating layer having an insulating property provided on an outer surface of a spider that is fixed to the shaft and rotates integrally with the shaft and holds the electromagnetic steel plate portion. The vehicle motor according to claim 1,
The vehicle motor according to claim 1, wherein the insulating portion is an insulating layer having an insulating property provided on an outer surface of the shaft. The vehicle motor according to claim 1,
The insulating portion is provided at least one of the shaft and the spider fixed to the shaft and rotating integrally with the shaft to hold the electromagnetic steel plate portion, or between the spider and the electromagnetic steel plate portion. A vehicle motor characterized by being an insulating material having high insulating properties.