JP2018207700A - Rotary motor and in-wheel motor driving device having the same - Google Patents

Abstract

To provide a rotary motor that can efficiently cool the inside of the rotary motor and can reduce vibrations to propagate through the housing of the rotary motor, and an in-wheel motor driving device that has the rotary motor.SOLUTION: A rotary motor 1 includes: a housing 4; a stator 5 in the inner periphery of the housing 4; and a rotor 6 in the inside of the stator 5 in the radial direction. The stator 5 has: a stator core 8 in which a plurality of sub-cores are lined in the shape of a ring; and a stator coil 9 wound around each sub-core. An end of the outer periphery of the stator core 8 in the axial direction is fixed to the inner periphery of the housing 4 in an interference fit state. Another end of the outer periphery of the stator core 8 in the axial direction is fixed to the housing 4 in the axial direction and in the radial direction by the outer periphery fixing ring 23. The region between the part interference-fit between the outer periphery surface of the stator core 8 and the inner periphery surface of the housing 4 and the outer-periphery fixing ring 23 is formed in a ring-shaped space δ.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary electric motor mounted on an electric vehicle and an in-wheel motor drive device including the rotary electric motor, and relates to a technique capable of reducing vibration and suppressing heat generation.

In an electric vehicle, quietness is important, and noise generated by a rotary motor is a problem. Therefore, the following techniques for reducing the vibration of the rotary motor have been proposed.
1. A gap is provided between the inner peripheral surface of the housing and the stator to reduce the vibration generated in the stator from being transmitted to the housing (Patent Document 1).
2. A seal member is disposed between the stator and the housing, and a coolant is filled in a cooling chamber surrounded by the stator, the housing, and the seal member. This suppresses heat generation from the stator and reduces transmission of vibration generated in the stator to the housing (Patent Document 2).

Japanese Patent No. 4811114 Japanese Patent Laying-Open No. 2015-82897

Increasing the heat generation inside the rotary motor accompanying the recent miniaturization and higher output of the motor has become a problem.
In Patent Document 1, since a gap is provided between the inner peripheral surface of the housing and the stator, heat generated in the stator cannot be radiated. The coil end above the horizontal plane including the central axis of the stator can be cooled, but the coil end below the horizontal plane cannot be sufficiently cooled, and only the outer peripheral part cools the stator core, The entire stator core cannot be cooled sufficiently.

  In Patent Document 2, since the stator is held in the housing via an elastic body, the stator is likely to be misaligned with respect to the rotor, and vibration due to misalignment and inclination may be a problem.

The main causes of heat generation in the rotary motor are heat generation of the coil (copper loss) caused by energizing current and heat generation (iron loss) caused by eddy currents generated in magnetic materials such as the stator core and rotor core. It is important to cool them efficiently.
One cause of vibration generated in the rotary motor is magnetostrictive vibration generated in the stator, and it is important to reduce these.

  An object of the present invention is to provide a rotary motor capable of efficiently cooling the inside of the rotary motor and reducing vibrations transmitted to the housing of the rotary motor, and an in-wheel motor drive device including the rotary motor. .

The rotary electric motor of the present invention includes a housing, an annular stator provided on the inner periphery of the housing, and a rotor that is positioned radially inward of the stator and is rotatable with respect to the stator. Is a stator core in which a plurality of split cores are arranged in an annular shape, and a rotary electric motor having a stator coil wound around each of the split cores,
One axial end portion of the outer peripheral surface of the stator core is fixed in an interference fit with the inner peripheral surface of the housing,
The other axial end of the outer periphery of the stator core is fixed to the housing in the axial direction and the radial direction by an outer peripheral fixing ring,
Between the outer periphery of the stator core and the inner peripheral surface of the housing, an area between the interference fit and the outer peripheral fixing ring is formed in an annular space.

According to this configuration, since the space between the outer peripheral surface of the stator core and the inner peripheral surface of the housing and the outer peripheral fixing ring is formed in the annular space and the contact area is small, the housing is directly connected to the stator. The vibration transmitted to can be reduced. By interposing a cooling medium in the annular gap, the heat invented by the stator core can be transmitted to the housing, and the heat generation of the rotary electric motor can be suppressed.
One axial end portion of the outer peripheral surface of the stator core is fixed in an interference fit with the inner peripheral surface of the housing, and the other axial end portion of the outer periphery of the stator core is fixed to the housing in the axial direction and the radial direction by the outer peripheral fixing ring. Therefore, the inclination of the stator core and the misalignment with respect to the rotor can be suppressed. Therefore, it is possible to suppress vibration due to the misalignment and inclination of the stator core.

  A groove extending in the axial direction may be provided on an outer periphery of the stator core, and the stator core may be fastened to the housing by a bolt that penetrates the groove and the outer peripheral fixing ring in the axial direction. In this case, the stator core can be reliably fixed to the housing together with the outer peripheral fixing ring.

  The outer periphery fixing ring may include a spigot portion that is indented and fitted to the other axial end portion of the outer periphery of the stator core, and may include a knock pin that positions the outer periphery fixing ring in the axial direction with respect to the housing. In this case, since the other axial end portion of the outer periphery of the stator core is stamped and fitted into the inlay portion of the outer peripheral fixing ring, it is possible to suppress the radial shaking of the stator core and to suppress the inclination of the stator core. Since the knock pin for positioning the outer peripheral fixing ring in the axial direction with respect to the housing is provided, the axial end surface of the outer peripheral fixing ring is pressed against the opposing surface (for example, a stepped portion) of the housing, thereby preventing the outer peripheral fixing ring from falling. Accordingly, the other axial end portion of the outer periphery of the stator core is firmly and securely fixed to the housing without being inclined by the outer peripheral fixing ring. Therefore, misalignment and inclination of the stator core can be prevented, and vibration caused by these misalignment and inclination can be more reliably suppressed.

The housing includes a cooling medium supply unit that supplies a cooling medium to the stator, and the outer peripheral fixing ring has a through hole that guides the cooling medium supplied from the cooling medium supply unit to a coil end of the stator coil. It may be provided.
The “coil end” refers to a portion of the stator coil wound around each divided core that protrudes in the axial direction with respect to the axial width of the stator core.
In this case, the stator coil can be efficiently cooled by guiding the cooling medium supplied from the cooling medium supply means of the housing to the coil end through the through hole of the outer peripheral fixing ring.

  A groove extending in the axial direction may be provided on the outer periphery of the stator core, and the groove may communicate with the through hole of the outer peripheral fixing ring. In this case, the cooling medium supplied from the housing can be smoothly guided to the coil end sequentially via the groove of the stator core and the through hole of the outer peripheral fixing ring.

  The in-wheel motor drive device of this invention is equipped with the wheel bearing which supports a wheel, and the rotary motor in any one of the said which rotates the rotating wheel of this wheel bearing. In a vehicle equipped with an in-wheel motor drive device, it may be difficult to reduce vibrations generated by the rotary motor as compared to an on-board type vehicle in which the rotary motor is mounted on the vehicle body. Since the in-wheel motor drive device with this configuration includes the rotary electric motor described above, vibration transmitted to the housing of the rotary electric motor can be reduced. Further, the inside of the rotary motor can be efficiently cooled.

  The rotary electric motor of the present invention includes a housing, an annular stator provided on the inner periphery of the housing, and a rotor that is positioned radially inward of the stator and is rotatable with respect to the stator. In the rotary motor having a stator core in which a plurality of divided cores are arranged in an annular shape and a stator coil wound around each of the divided cores, one axial end portion of the outer peripheral surface of the stator core is formed on the inner peripheral surface of the housing. The other axial end of the outer periphery of the stator core is fixed in the axial direction and the radial direction with respect to the housing by an outer peripheral fixing ring, and the outer peripheral surface of the stator core and the inner peripheral surface of the housing An annular space is formed between the interference-fitted portion and the outer peripheral fixing ring. For this reason, while rotating the inside of a rotary motor efficiently, the vibration transmitted to the housing of a rotary motor can be reduced.

  Since the in-wheel motor drive device of the present invention includes the wheel bearing that supports the wheel and the rotating motor according to any one of the above that rotates the rotating wheel of the wheel bearing, the inside of the rotating motor is efficiently cooled. In addition, vibration transmitted to the housing of the rotary motor can be reduced.

It is sectional drawing of the in-wheel motor drive device provided with the rotary electric motor which concerns on embodiment of this invention. It is an expanded sectional view of the rotary electric motor. It is the side view which looked at the stator and outer periphery fixing ring of the rotation motor from the axial direction. It is a figure which shows the flow of the cooling medium to the coil end of the rotary electric motor. It is a figure which shows the flow of the cooling medium to the annular space between the stator and a housing. It is an expanded sectional view of the rotary electric motor which concerns on other embodiment of this invention.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of an in-wheel motor drive device including a rotary electric motor according to an embodiment.
<About schematic structure of in-wheel motor drive device>
The vehicle is, for example, an in-wheel motor type in which two in-wheel motor driving devices are mounted and left and right driving wheels are independently driven by these in-wheel motor driving devices. Since the two in-wheel motor driving devices have the same configuration, only one in-wheel motor driving device is shown in FIG. This in-wheel motor drive device includes a rotary electric motor 1 that generates a driving force of a vehicle, a speed reducer 2 that decelerates and outputs the rotation of the rotary electric motor 1, and an output from the speed reducer 2 that is not shown. And a wheel hub bearing portion (wheel bearing) 3 for transmitting to the wheel.

<Rotary motor 1>
As shown in FIG. 2, the rotary electric motor 1 includes a housing 4, a stator 5, and a rotor 6. The rotary electric motor 1 is a radial gap type in which an annular stator 5 is provided on the inner periphery of a housing 4 and a rotor 6 is provided at an interval inward in the radial direction of the stator 5. The housing 4 includes a main housing 4a and a side housing 4b. A main housing 4a having a substantially cylindrical shape with a bottom is provided with internal components of the rotary electric motor 1, a speed reducer 2 (FIG. 1), and a wheel hub bearing portion 3 (FIG. 1). The side housing 4b closes the opening end on the inboard side of the main housing 4a. In this specification, the side closer to the outside in the vehicle width direction of the vehicle when the in-wheel motor drive device is mounted on the vehicle is referred to as the outboard side, and the side closer to the center in the vehicle width direction of the vehicle is referred to as the inboard side. Called the board side.

As shown in FIGS. 3 and 5, the stator 5 includes a stator core 8 in which a plurality of divided cores 7 are arranged in an annular shape, and a stator coil 9 wound around each divided core 7.
As shown in FIG. 1, the rotor 6 is rotatable with respect to the stator 5. The rotor 6 includes a rotor spindle 10, a rotor core 11, and a plurality of permanent magnets 12 built in the rotor core 11. The plurality of permanent magnets 12 are arranged at regular intervals in the circumferential direction.

  The rotor spindle 10 is located at the center of the rotary motor. The rotor spindle 10 is rotatably supported by rolling bearings 13 and 13 fitted and fixed to the main housing 4a and the side housing 4b, respectively. A part of the rotor spindle 10 in the axial direction protrudes into the reducer 2 on the outboard side, and is splined (including serrations, the same applies hereinafter) to the input gear shaft 14 of the reducer 2 coaxially. . The rotary electric motor 1 is provided with a rotational speed detecting means 15 such as a resolver for detecting the rotational speed of the rotor 6.

<Reduction gears, etc.>
The speed reducer 2 includes a parallel shaft gear reduction including an input gear shaft 14 having an input gear 14a, an intermediate gear shaft 16 having first and second intermediate gears 16a and 16b, and an output gear shaft 17 having an output gear 17a. Machine. The input gear shaft 14 is rotatably supported via rolling bearings 18 and 18 provided in the main housing 4a. The intermediate gear shaft 16 is a stepped gear having a large-diameter first intermediate gear 16a meshing with the input gear 14a and a small-diameter second intermediate gear 16b meshing with the output gear 17a on the outer peripheral surface. The intermediate gear shaft 16 is rotatably supported via rolling bearings 19 and 20 provided in the main housing 4a. The output gear shaft 17 has a large-diameter output gear 17a and is rotatably supported via rolling bearings 21 and 22 provided in the main housing 4a.

  A driving force is transmitted from the rotor spindle 10 of the rotary electric motor 1 to the input gear shaft 14. The first intermediate gear 16a meshes with the input gear 14a, and the second intermediate gear 16b meshes with the output gear 17a. A part of the output gear shaft 17 in the axial direction is pulled out from the main housing 4a to the outboard side, is spline-fitted to the rotating wheel of the wheel hub bearing portion 3, and transmits driving force to driving wheels (not shown).

<About the fixing structure of the stator 5>
As shown in FIG. 2, one axial end portion (the end portion on the outboard side) of the outer peripheral surface of the stator core 8 is fixed to the inner peripheral surface of the main housing 4 a in an interference fit state by press fitting or shrink fitting. . The other axial end portion (the end portion on the inboard side) of the outer periphery of the stator core 8 is fixed to the main housing 4a in the axial direction and the radial direction by the outer peripheral fixing ring 23. A space between the outer peripheral surface of the stator core 8 and the main housing 4a and the outer peripheral fixing ring 23 is formed in an annular space δ.

  Annular steps 24 and 25 are formed on the outboard side of the inner peripheral surface of the main housing 4a, respectively, and an annular step 26 is formed on the inboard side of the inner peripheral surface of the main housing 4a. The inner peripheral surface of the main housing 4a is formed at the small diameter portion 27, the medium diameter portion 28, and the large diameter portion 29 sequentially from the outboard side to the inboard side by the steps 24, 25, and 26. One end portion in the axial direction of the outer peripheral surface of the stator core 8 is fixed to the small diameter portion 27 of the inner peripheral surface of the main housing 4a in an interference fit state. Further, one end face of the stator core 8 is brought into contact with the step 24 on the most outboard side of the main housing 4a, so that the stator 5 is positioned in the axial direction.

  The outer peripheral fixing ring 23 fixes the end portion on the inboard side of the stator core 8 to the main housing 4a in the radial direction. In other words, the outer peripheral fixing ring 23 has a function of preventing the inclination of the stator core 8 with respect to the main housing 4a. The outer periphery fixing ring 23 fixes the end portion on the inboard side of the stator core 8 in the axial direction with respect to the main housing 4a. The outer peripheral fixing ring 23 is integrally formed in an L-shaped cross section by a cylindrical portion 23a and a standing plate portion 23b extending inward in the radial direction from one end surface of the cylindrical portion 23a. The outer peripheral fixing ring 23 is preferably made of a nonmagnetic material such as stainless steel. However, nonmagnetic materials other than stainless steel may be used. A magnetic material can also be used.

  The outer peripheral surface of the cylindrical portion 23a of the outer peripheral fixing ring 23 is fixed to the large-diameter portion 29 of the inner peripheral surface of the main housing 4a by press-fitting or shrink fitting. The outer peripheral fixing ring 23 is positioned in the axial direction by bringing the other end surface of the cylindrical portion 23a into contact with the step 26 on the most inboard side of the main housing 4a. An inlay portion 23aa is provided on the inner peripheral surface of the cylindrical portion 23a of the outer periphery fixing ring 23. An inlay portion 23aa of the cylindrical portion 23a is stamped and fitted into the other axial end portion of the outer periphery of the stator core 8 by press-fitting or shrink fitting. The inner surface of the upright plate portion 23b of the outer peripheral fixing ring 23 is provided in contact with the end portion of the stator core 8 on the inboard side. As a result, the stator core 8 is positioned in the axial direction.

  As shown in FIGS. 1 and 3, the stator core 8 and the outer peripheral fixing ring 23 are fastened to the main housing 4 a by a plurality of (six in this example) bolts 30. A plurality of (12 in this example) through holes 31 are formed in the standing plate portion 23b of the outer peripheral fixing ring 23 at regular intervals in the circumferential direction. The uppermost through-hole 31 among these through-holes 31 guides the cooling medium to the coil end 9a (FIG. 4) of the stator coil 9, as will be described later. As shown in FIG. 5, a plurality of (in this example, twelve) grooves 32 (notches) extending in the axial direction are provided on the outer periphery of the stator core 8.

  As shown in FIGS. 1, 3, and 5, the plurality of through holes 31 of the outer peripheral fixing ring 23 and the plurality of grooves 32 of the stator core 8 are provided in the same phase. In each phase, the through hole 31 and the groove 32 are arranged to communicate with each other. A plurality of screw portions are formed on the step 24 (FIG. 2) of the main housing 4a. The front end of each bolt 30 is passed through the through hole 31 and the groove 32 and is further screwed into the corresponding threaded portion.

  As shown in FIG. 3, the cylindrical portion 23 a of the outer peripheral fixing ring 23 is provided with two projecting portions 33 that project outward in the radial direction. These protrusions 33 are provided at locations where the phases are different in the cylindrical portion 23a (locations where the phases are different by 180 degrees in this example). Each projecting portion 33 is provided with a knock pin 34 projecting to the outboard side. The main housing 4a (FIG. 1) is formed with recesses (not shown) that do not interfere with the protrusions 33, and axial holes (not shown) into which the knock pins 34 are driven. As the knock pins 34 are driven into the holes of the main housing 4a (FIG. 1), as shown in FIG. 2, the axial end surface of the cylindrical portion 23a of the outer peripheral fixing ring 23 is opposite to the main housing 4a. The outer peripheral fixing ring 23 can be prevented from falling down by being pressed against the step portion 26. Accordingly, the other axial end portion of the outer periphery of the stator core 8 is firmly and securely fixed to the housing 4 without being inclined by the outer peripheral fixing ring 23. The knock pin 34 positions the outer peripheral fixing ring 23 with respect to the main housing 4a in a predetermined phase. The knock pin 34 may be a parallel pin or a taper pin.

<About cooling structure>
As shown in FIGS. 4 and 5, the main housing 4 a is provided with a cooling medium supply means 35 for supplying a cooling medium to the stator 5. For example, oil is used as the cooling medium. The cooling medium supply means 35 includes a cooling medium supply port provided at the upper part of the main housing 4a. A pump 37 is connected to the supply port via a pipe 36. The groove 32 of the stator core 8 communicates with the supply port via the annular space δ. In the step 24 of the main housing 4a, a notch 38 communicating with the groove 32 is formed at a position in phase with the groove 32 communicating with the supply port. A through hole 31 that communicates with the groove 32 is formed in a position in the same phase as the groove 32 that communicates with the supply port in the standing plate portion 23 b of the outer peripheral fixing ring 23.

  Therefore, as shown in FIG. 4, by driving the pump 37, the cooling medium is guided from the cooling medium supply means 35 to both sides in the axial direction through the annular space δ and the groove 32, and further, the notch 38 and the through hole are provided. 31 to the coil end 9a. Thereby, the coil end 9a is cooled. Further, as shown in FIG. 5, the cooling medium is guided from the cooling medium supply means 35 along the annular space δ to cool the outer periphery of the stator core 8.

<Effect>
According to the rotary electric motor 1 described above, the space between the outer peripheral surface of the stator core 8 and the inner peripheral surface of the main housing 4a and the outer peripheral fixing ring 23 is formed in the annular space δ and contacted. Since the area is small, vibration transmitted directly from the stator 5 to the housing 4 can be reduced. By interposing the cooling medium in the annular gap δ, the heat invented by the stator core 8 can be transmitted to the housing 4 and the heat generation of the rotary electric motor 1 can be suppressed.

  One axial end portion of the outer peripheral surface of the stator core 8 is fixed in an interference fit with the inner peripheral surface of the main housing 4a, and the other axial end portion of the outer periphery of the stator core 8 is fixed to the main housing 4a by the outer peripheral fixing ring 23. Since it is fixed in the axial direction and the radial direction, the inclination of the stator core 8 and the misalignment with respect to the rotor 6 can be suppressed. Therefore, vibrations caused by misalignment and inclination of the stator core 8 can be suppressed.

  A groove 32 extending in the axial direction is provided on the outer periphery of the stator core 8, and the stator core 8 is fastened to the housing 4 by a bolt 30 penetrating the groove 8 and the outer peripheral fixing ring 23 in the axial direction. The stator core 8 can be reliably fixed together with the outer peripheral fixing ring 23 to the housing 4a. Since the outer peripheral fixing ring 23 has an inlay portion 23aa fitted to the other axial end portion of the outer periphery of the stator core 8, it is possible to suppress the radial shaking of the stator core 8 and to suppress the inclination of the stator core 8. . Since the knock pin 34 for positioning the outer peripheral fixing ring 23 in the axial direction with respect to the main housing 4a is provided, the axial end surface of the outer peripheral fixing ring 23 is pressed against the step portion 26 of the main housing 4a to prevent the outer peripheral fixing ring 23 from falling. I can plan. Accordingly, the other axial end portion of the outer periphery of the stator core 8 is firmly and securely fixed to the housing 4 without being inclined by the outer peripheral fixing ring 23. Therefore, misalignment and inclination of the stator core 8 can be prevented, and vibration caused by these misalignment and inclination can be more reliably suppressed. By guiding the cooling medium supplied from the cooling medium supply means 35 of the main housing 4a to the coil end 9a through the through hole 31 of the outer peripheral fixing ring 23, the stator coil 9 can be efficiently cooled.

<About other embodiments>
In the following description, the same reference numerals are given to portions corresponding to the matters described in advance in the respective embodiments, and overlapping descriptions are omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified. The same effect is obtained from the same configuration. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

  As shown in FIG. 6, the stator coil 9 may be wound around each tooth of the stator core 8 via a bobbin (insulator) 39. The bobbin 39 is made of an insulating material and has a cylindrical coil winding portion 39a into which each tooth is inserted, an outer diameter side flange portion 39b, and an inner diameter side flange portion 39c. The outer diameter side flange 39b protrudes along the coil lamination direction from the outer diameter end of the coil winding part 39a in the radial direction. The inner diameter side flange 39c protrudes from the radial inner diameter end of the coil winding portion 39a along the coil stacking direction. A through hole 39ba is formed in the outer diameter side flange 39b. The cooling medium is guided in the axial direction from the cooling medium supply means 35 through the annular space δ and the groove 32, and further passes through the outer diameter side flange 39b via the notch 38 and the through hole 31 (FIG. 4). It is led from the hole 39ba to the coil end 9a. In addition, the same effects as those of the above-described embodiment can be obtained.

This rotary electric motor may be applied to a motor-on-board type vehicle.
The speed reducer is not limited to a parallel shaft gear speed reducer, and can be applied to various speed reducers such as a planetary gear type.
The in-wheel motor drive device may be a direct motor type rotary motor without a reduction gear.
The rotary motor may be an SPM type in which a permanent magnet is provided on the surface of the rotor core.
The form in which the said pump is incorporated in an in-wheel motor drive device may be sufficient, and the form in which a pump is provided in the exterior of an in-wheel motor drive device may be sufficient.
Instead of the through hole of the outer peripheral fixing ring, a groove through which the bolt passes and becomes a passage for the cooling medium may be provided.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Rotary motor 3 ... Wheel hub bearing part (wheel bearing)
DESCRIPTION OF SYMBOLS 4 ... Housing 5 ... Stator 6 ... Rotor 7 ... Split core 8 ... Stator core 9 ... Stator coil 9a ... Coil end 23 ... Outer periphery fixing ring 23aa ... Inlay part 30 ... Bolt 31 ... Through-hole 32 ... Groove 34 ... Knock pin 35 ... Cooling medium Supply means δ: annular space

Claims (6)

A housing, an annular stator provided on the inner periphery of the housing, and a rotor positioned radially inwardly of the stator and rotatable relative to the stator. The stator includes a plurality of divided cores. In a rotary motor having a stator core arranged in an annular shape and a stator coil wound around each of the divided cores,
One axial end portion of the outer peripheral surface of the stator core is fixed in an interference fit with the inner peripheral surface of the housing,
The other axial end of the outer periphery of the stator core is fixed to the housing in the axial direction and the radial direction by an outer peripheral fixing ring,
A rotary electric motor in which an annular space is formed between the interference-fitted portion between the outer peripheral surface of the stator core and the inner peripheral surface of the housing and the outer peripheral fixing ring.   The rotary electric motor according to claim 1, further comprising a groove extending in an axial direction on an outer periphery of the stator core, wherein the stator core is fastened to the housing by a bolt penetrating the groove and the outer peripheral fixing ring in the axial direction. Rotating electric motor.   3. The rotary electric motor according to claim 1, wherein the outer peripheral fixing ring has an inlay portion fitted to an axial other end of the outer periphery of the stator core, and the outer peripheral fixing ring with respect to the housing. A rotary electric motor having a knock pin for positioning the shaft in the axial direction.   4. The rotary electric motor according to claim 1, wherein the housing includes a cooling medium supply unit that supplies a cooling medium to the stator, and the outer peripheral fixing ring includes the cooling medium supply unit. 5. A rotary electric motor provided with a through hole that guides a cooling medium supplied from a coil end of the stator coil.   5. The rotary motor according to claim 4, wherein a groove extending in an axial direction is provided on an outer periphery of the stator core, and the groove communicates with the through hole of the outer peripheral fixing ring.   An in-wheel motor drive device comprising: a wheel bearing that supports a wheel; and the rotary motor according to any one of claims 1 to 5 that rotates a rotating wheel of the wheel bearing.

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