JP7361813B2 - rotating electric machine - Google Patents

Description

The present application relates to a rotating electric machine.

BACKGROUND ART As a structure of a rotating electric machine including an electric motor, a generator, and a motor generator, a method is sometimes used in which a stator is integrated into a frame by a method such as press-fitting or shrink-fitting. The frame integrated with the stator in this manner can be fixed to the case of the rotating electric machine by screwing. Since the stator and frame can be standardized regardless of variations in the shape of the case of the rotating electric machine, the rotating electric machine can be manufactured efficiently. Furthermore, a coolant flow path can be provided in the space between the case and the frame of the rotating electric machine.

When fixing the stator of a rotating electric machine to a frame, it is necessary to prevent positional displacement due to torque reaction force when the rotor rotates. Furthermore, when mounted on a vehicle, it must withstand acceleration and vibrations applied during vehicle operation. It is also necessary to prevent them from falling off due to impact caused by vehicle collisions. For these purposes, the stator is press-fitted into the frame with appropriate interference.

When the stator is fixed to the frame, compressive stress from the frame surrounding the stator is applied to the stator core, leading to deformation of the core. Deformation of the axially laminated electromagnetic steel sheets used in the core deteriorates magnetic resistance and causes loss. Furthermore, there is a risk of large out-of-plane deformation at both end faces in the axial direction of the iron core.

In order to reduce deformation of the stator core due to compressive stress from the frame, it has been proposed to change the inner diameter of the frame. At the axial center of the frame, the inner diameter of the frame is reduced to maintain a large interference margin for the core, and at both axial end faces, the inner diameter of the frame is increased to reduce the interference of the core. A technique has been disclosed that reduces the compressive stress generated on the axial end face of the iron core and alleviates the deformation of the electromagnetic steel sheet by doing so (for example, Patent Document 1).

Japanese Patent Application Publication No. 2021-158875

The frame that fixes the stator is configured to be longer in the axial direction than the axial length of the stator and the axial length of the iron core around which the coils are wound, for the purpose of protecting the coils wound around the iron core of the stator. In the rotating electric machine described in Patent Document 1, the interference at the axial end portions of the iron core by the frame is smaller than the interference at the axial center portion of the iron core. Therefore, compressive stress applied to the iron core at the axial ends is reduced, deformation of the electromagnetic steel sheet is alleviated, and deterioration of loss can be prevented.

However, since the axial length of the frame is longer than the axial length of the iron core, the inner cylindrical part of the frame collapses toward the inner diameter side at the axial end of the iron core. When the frame inner cylindrical portion falls inward, the flange portion formed at the end of the frame also leans. The flange portion formed at the end of the frame is provided for fixing to a case that is a housing of the rotating electric machine, and the flange portion is fixed to the case by tightening screws. This tilting of the flange creates a gap between it and the mounting surface of the case. This gap may cause problems such as insufficient tightening of the screws that secure the flange portion to the case or loosening of the screws.

The present application was made in order to solve the above-mentioned problems, and is intended to reduce the inclination of the frame inner cylindrical part toward the inner diameter side at the axial end of the iron core, and to reduce the flange part configured at the frame end. The purpose of this invention is to obtain a rotating electrical machine that can suppress the inclination of the machine. By suppressing the inclination of the flange portion, it is possible to prevent a gap between fixing the frame and the case and loosening of fixing screws.

The rotating electric machine according to the present application is
rotor,
A cylindrical stator placed around the outer circumference of the rotor,
A stator support part that is arranged on the outer peripheral side of the stator and whose inner diameter gradually increases from the axial center to the axial end, and a flange part that is provided at one axial end and extends radially outward. and a thick wall portion formed across one end of the stator in the axial direction,
In a rotating electrical machine equipped with a case that supports the frame from the outer periphery and fixes the frame by combining with the flange part,
The flange portion of the frame is provided with the outer side in the radial direction inclined toward the other side in the axial direction with respect to a plane perpendicular to the axial direction,
In the frame, the angle at which the radially outer side of the flange part is inclined toward the other side in the axial direction with respect to a plane perpendicular to the axial direction, and the inner diameter of the stator support part gradually increases from the axial center part to the axial end part. The tapered portion is defined in accordance with the angle of inclination with respect to the axial direction .
In addition, the rotating electric machine according to the present application is
rotor,
A cylindrical stator placed around the outer circumference of the rotor,
A stator support part that is arranged on the outer peripheral side of the stator and whose inner diameter gradually increases from the axial center to the axial end, and a flange part that is provided at one axial end and extends radially outward. and a thick wall portion formed across one end of the stator in the axial direction,
In a rotating electrical machine equipped with a case that supports the frame from the outer periphery and fixes the frame by combining with the flange part,
The stator support portion of the frame has a uniform inner diameter portion having a constant inner diameter at the center in the axial direction,
The thick portion of the frame is provided in a region that overlaps in the axial direction with a region of the stator support portion where the inner diameter gradually increases, excluding the uniform inner diameter portion.

According to the rotating electric machine according to the present application, a rotating electric machine can be obtained that can reduce the inclination of the frame inner cylindrical part toward the inner diameter side at the axial end of the iron core, and suppress the inclination of the flange part configured at the frame end. be able to. As a result, it is possible to suppress the inclination of the flange portion, prevent the generation of a fixing gap between the frame and the case, and prevent the fixing screws from loosening, thereby improving the reliability of the rotating electric machine.

1 is a cross-sectional view of a rotating electric machine according to a first embodiment. FIG. 2 is a sectional view of a frame to which a stator of the rotating electric machine according to the first embodiment is fixed. FIG. 3 is a cross-sectional view of the frame of the rotating electrical machine according to the first embodiment before the stator is fixed. FIG. 3 is a cross-sectional view of a frame of a rotating electrical machine according to a first comparative example after the stator is fixed. FIG. 7 is a sectional view of a frame of a rotating electrical machine according to a second comparative example after the stator is fixed. FIG. 3 is a cross-sectional view of the frame of the rotating electrical machine according to the first embodiment after the stator is fixed. FIG. 3 is a cross-sectional view of a frame of a rotary electric machine according to a second embodiment before a stator is fixed.

Embodiments of the present application will be described below with reference to the drawings.

1. Embodiment 1
<Configuration of rotating electrical machine>
FIG. 1 is a sectional view of a rotating electrical machine 50 according to the first embodiment. FIG. 1 shows the basic configuration of a rotating electrical machine 50. The rotating electric machine 50 includes a rotor 1 and a stator 2. The shaft 7 of the rotor 1 is held by a bearing 5 disposed in a case 3 and a lid 4 that constitute a casing of a rotating electric machine 50 . The bearing 5 is positioned at the axis of the case 3 and the lid 4, and the rotor 1 is rotatably held opposite the stator 2. A plurality of permanent magnets are embedded inside the core of the rotor 1 at predetermined intervals in the circumferential direction. A shaft 7 fixed at the center of the rotor 1 extracts rotational torque to the outside or applies rotational torque to the rotor 1 from the outside.

Note that the rotor 1 is not limited to such a permanent magnet rotor, and a wire-wound rotor or the like may be used. A so-called squirrel-cage rotor may be used in which uninsulated rotor conductors are accommodated in slots of a rotor core and both sides are short-circuited with short-circuit rings. Alternatively, a wire-wound rotor having slots in which stator windings are formed in the rotor core may be used.

<Stator configuration>
FIG. 2 is a sectional view of the frame 12 to which the stator 2 of the rotating electric machine 50 according to the first embodiment is fixed. The stator 2 includes an iron core 10, an insulating member, and a coil 11. The core 10 includes a plurality of divided laminated cores stacked in the axial direction and combined in the circumferential direction. Electrical steel sheets are used for the split laminated core.

The electromagnetic steel sheet constitutes a yoke portion having an annular shape by combining it with other divided laminated cores in the circumferential direction. The electromagnetic steel plate forms teeth that are narrower in circumferential width than the yoke portion and protrude toward the rotor. A segmented laminated core consists of electrical steel sheets laminated in the axial direction and integrated by welding, caulking, etc. In addition. The iron core 10 may be a split core in which a plurality of such split laminated cores are combined in an annular shape, or may be a monolithic core that is integrated in the circumferential direction.

A coil 11 is wound around the teeth of the iron core. The winding of the coil 11 may be concentrated winding in which the coil 11 is wound around only one tooth of the split laminated core, or distributed winding in which the coil 11 is wound between a plurality of teeth combined in an annular shape. There may be.

A conductor wire with an insulating coating is used for the coil 11. The conductor wire may be a copper wire or an aluminum wire. The coil 11 is insulated from the iron core 10 by an insulating coating. Insulation is ensured between the iron core 10 and the coil 11 by interposing an insulating material such as paper or resin between the core 10 and the coil 11 in order to prevent dielectric breakdown due to pin poles occurring in the coating of the coil 11.

The iron core 10 and the frame 12 are assembled by a method such as press fitting or shrink fitting. By configuring the frame 12 to be longer than the length in the axial direction of the coil 11 and the iron core 10, it is possible to prevent the coating of the coil 11 from peeling off due to scratches or the like and damaging the insulation. A flange portion 13 for fixing the frame 12 to the case 3 is formed at one end of the frame 12 in the axial direction. The flange portion 13 is fixed to the case 3, which is the casing of the rotating electric machine 50, with screws or the like.

The rotating electrical machine 50 generates magnetic force by supplying electric power to the coil 11 of the stator 2 from the outside. By temporally changing the phase of the power supplied to the coil 11, attraction and repulsion occur continuously between the magnetic force generated in the stator 2 and the magnets embedded in the rotor 1. This rotates the rotor 1 and transmits rotational torque to the shaft 7 fixed to the rotor 1.

<Cooling medium flow path>
The stator 2 generates heat due to coil resistance and the like due to power supply. When the stator 2 becomes hot, its magnetic force is attenuated, resulting in a loss, so it is necessary to cool it down. In the example of FIG. 1, a cooling medium flow path 6 is formed between the frame 12 and the case 3, and the frame 12 is cooled by circulating the cooling medium. By dissipating the heat of the stator 2 to the cooled frame 12, the temperature rise of the stator 2 is suppressed.

The frame 12 is provided with a convex portion 16 and a thick portion 21 in order to form a coolant flow path 6 between the frame 12 and the case 3. Further, an O-ring 14 is arranged on the convex portion 16 and the thick portion 21 to ensure airtightness with the case 3. The inner diameter of the case 3 is precisely finished in relation to the outer diameter of the convex portion 16 and the outer diameter of the thick wall portion 21 of the frame 12 so that the O-ring 14 is appropriately crushed and fills the gap between the frame 12 and the case 3. ing. Cooling water may be used as the cooling medium.

In order to secure the cooling medium flow path 6, protrusions 16 may be provided at both ends of the frame 12 in the axial direction. This is because the cooling medium flow path 6 can be freely set regardless of the position of the thick wall portion 21. Further, by making the thick portion 21 also serve as the convex portion 16, it is possible to contribute to reduction in size and weight.

<Frame shape>
FIG. 3 is a sectional view of the frame 12 of the rotating electrical machine 50 according to the first embodiment before the stator 2 is fixed. The inner diameter of the frame 12 is machined to a size that provides an appropriate tightening margin for fixing the stator 2 by press-fitting, shrink-fitting, or the like. A portion of the frame 12 that contacts the stator 2 is referred to as a stator support portion 20. In the first embodiment, the stator support portion 20 of the frame 12 has a smaller inner diameter at the axial center portion 20a of the stator support portion. The inner diameter of the stator support portion axial end portion 20b is increased. By doing so, the interference of the core 10 of the stator 2 by the frame 12 can be set to be large at the axial center and small at the axial ends. The portion of the stator support portion 20 where the interference changes is smoothly connected in a tapered manner.

In the axial center portion 20a of the stator support portion, the inner diameter may be made small and constant. By providing the section with the smallest inner diameter in a predetermined range, the iron core 10 can be tightened and firmly fixed over a predetermined length.

As for the inner diameter dimensions of the stator support portion 20 of the frame 12, the radius of the stator support portion axial center portion 20a is R1, and the radius of the stator support portion axial end portion 20b is R2. When the interference of the stator support part axially central portion 20a with respect to the iron core 10 is defined as IF, by setting the relationship of (R2-R1)<IF, a gap is generated between the frame 12 at both ends of the iron core 10. can be prevented. By doing so, generation of noise due to vibration can be prevented.

Further, at least one of the frames 12 of the stator support portion 20 facing the axial end of the iron core 10 is made into a thick wall portion 21 so as to straddle the end of the iron core 10 to have a large outer diameter. Then, the other axial end of the iron core 10 is made into a convex portion 16 to increase the outer diameter. The thick portion 21 of the frame 12, the convex portion 16, and the inner diameter portion of the case 3 constitute a cooling medium flow path 6. An O-ring 14 that functions as an airtight sealing member is arranged on the thick portion 21 and the convex portion 16 of the frame 12.

<First comparative example>
FIG. 4 is a sectional view of the frame 12b after the stator 2 of the rotating electrical machine according to the first comparative example is fixed. As a first comparative example, FIG. 4 shows the state of the frame 12b after the stator 2 is press-fitted when the inner diameter is the same throughout the axial direction of the iron core 10. Since strong compressive stress is generated at the end faces of the iron core 10, the electromagnetic steel sheets are deformed out of plane at both end faces of the laminated electromagnetic steel sheets. The iron core 10 is deformed, the magnetic resistance deteriorates, and the loss increases.

At this time, the cylindrical portion of the frame 12b is deformed at the end of the iron core 10 due to the sudden change in stress. The cylindrical portion of the frame 12b collapses inward using the end of the iron core 10 as a fulcrum. As a result, the flange portion 13b connected to the end of the cylindrical portion of the frame 12b also collapses. Further, when the cooling medium flow path 6b is formed on the outer diameter portion of the frame 12b, the attachment portion of the O-ring 14, which is a sealing member, arranged on the convex portion 16b of the frame 12b is also deformed.

In FIG. 4, the inclination angle of the cylindrical portion on the flange portion 13b side of the frame 12b is indicated by A4, and the inclination angle of the cylindrical portion at the other end is indicated by A5. A gap opens between the flange portion 13b of the frame 12b and the case 3, resulting in an inclination at an angle A6. For this reason, the screwed portion that fixes the flange portion 13b to the case 3 is deformed, reducing reliability. Moreover, there is a possibility that a problem will occur in the airtightness of the cooling medium flow path 6b.

<Second comparative example>
FIG. 5 is a cross-sectional view of the frame 12c after fixing the stator 2 of the rotating electric machine according to the second comparative example. As a second comparative example, FIG. 5 shows the state after the stator 2 is press-fitted when the inner diameter of the frame 12c is set such that the interference at the center of the core 10 is increased and the interference at the axial ends of the core 10 is decreased. ing. Since the inner diameter of the frame 12c is larger at both ends of the core 10 than at the center, the compressive stress decreases smoothly from the center to both ends of the core 10. Therefore, the compressive stress is the smallest at both ends of the iron core 10. Further, deformation of the laminated electromagnetic steel sheets due to compressive stress at the axial end portion of the iron core 10 can be made smaller than in the case of FIG. 4 according to the first comparative example.

However, even in this case, the cylindrical portion of the frame 12c is deformed at the end of the iron core 10 due to a sudden change in stress. The cylindrical portion of the frame 12c collapses inward using the end of the iron core 10 as a fulcrum. As a result, the flange portion 13c connected to the end of the cylindrical portion of the frame 12c also collapses.

In FIG. 5, the inclination angle of the cylindrical portion on the side of the flange portion 13c of the frame 12c is indicated by A7, and the inclination angle of the cylindrical portion at the other end is indicated by A8. The inclination that occurs between the flange portion 13c of the frame 12c and the case 3 is indicated by A9. These deformations and inclinations are more relaxed than in the case of FIG. 4 according to the first comparative example.

The angle of inclination of the cylindrical portion of the frame 12c can be set as follows: A7<A4, A8<A5. The inclination accuracy of the flange portion 13c can be set as A9<A6. Furthermore, since the deformation of the O-ring 14 holding portion of the convex portion 16c provided on the outer diameter side of the frame 12c is alleviated, the airtightness of the coolant flow path 6c by the O-ring 14 can be improved. However, the angles A7 and A8 of the inclination of the cylindrical portion and the inclination angle A9 of the flange portion 13c exist, which affect the reliability of the rotating electric machine.

<Formation of thick part>
FIG. 6 is a sectional view of the frame 12 after the stator 2 of the rotating electrical machine 50 according to the first embodiment is fixed. As described with reference to FIG. 3, the outer diameter of the frame 12 is increased by providing the thick portion 21 so as to straddle the end of the core 10 on the flange portion 13 side of the stator support portion 20.

The thick part 21 strengthens the rigidity of the cylindrical part itself on the flange part 13 side of the frame 12, which is in contact with the axial end of the iron core 10. By providing the thick portion 21, it is possible to further prevent the cylindrical portion of the frame 12 from collapsing compared to the second comparative example shown in FIG. Thereby, the flange portion 13 is fixed to the case 3 without any gaps, and the reliability of the rotating electric machine can be improved. The gap can prevent problems such as insufficient tightening of the screws that fix the flange portion 13 to the case 3 or loosening of the screws.

Since the flange portion 13 is fixed to the case 3 without a gap, no noise is generated even if vibration is applied to the rotating electric machine 50. Furthermore, deformation of the O-ring 14 attachment portion that seals the coolant flow path 6 formed in the space between the frame 12 and the case 3 can be prevented, and the airtightness of the coolant flow path 6 can be maintained. be able to.

3 and 6 show an example in which the thick portion 21 of the outer diameter of the cylindrical portion of the frame 12 is provided only on the flange portion 13 side. However, if the airtightness due to the O-ring 14 at the axial end opposite to the flange portion 13 becomes a problem, a thick wall portion 21 is provided in the cylindrical portion spanning the end of the iron core 10 opposite to the flange portion 13. This can prevent the cylindrical portion on the opposite side from falling.

An example has been described in which the thick portion 21 is provided to increase the outer diameter of the cylindrical portion in order to increase the rigidity of the end portion of the cylindrical portion of the frame 12. However, in order to increase the rigidity of the end portion of the cylindrical portion of the frame 12, ribs may be provided in the axial direction. This is advantageous because it is possible to strengthen the rigidity of the cylindrical portion of the frame 12 while suppressing increases in weight and material costs.

2. Embodiment 2
FIG. 7 is a sectional view of the frame 12a before the stator of the rotating electric machine according to the second embodiment is fixed. The cylindrical portion of the frame 12a tends to fall radially inward at the axial end of the stator 2 due to the press-fitting of the iron core 10 of the stator 2. The flange portion 13a formed at the end of the frame 12a is also inclined.

Therefore, in the frame 12a of the rotating electric machine according to the second embodiment, the flange portion 13a is formed to be inclined in the opposite direction to the direction in which the iron core 10 is inclined by press-fitting. Thereby, after the iron core 10 is press-fitted, the flange portion 13a can be fixed to the case 3 without any gaps.

The inclination angle given in advance to the flange portion 13a is shown as angle A2 in FIG. Here, the angle formed with the axial direction of the tapered portion where the inner diameter of the stator support portion axial end portion 20b of the frame 12a gradually increases is defined as A1. In the state before the iron core 10 is press-fitted, the angle formed by the tapered portion of the frame 12a (the axial end portion 20b of the stator support portion) and the flange portion 13a is defined as A3. It is also possible to set A3=90 degrees and A1=A2.

By setting the inclined surface of the flange portion 13a to be perpendicular to the tapered portion of the frame 12a (stator support portion axial end portion 20b), the flange portion 13a is prevented from collapsing toward the inner diameter side of the cylindrical portion of the frame 12a. It can be offset by the slope. This allows the flange portion 13a and the mounting surface of the case 3 to be kept parallel. This is because such an angular relationship is established when the cylindrical portion of the frame 12a naturally collapses under stress.

However, in consideration of the rigidity of the cylindrical portion of the frame 12a, the dimensions of the thick portion 21a, etc., the angle A2 may be set to a different angle from the angle A1. The optimal angle can also be found through experimentation. In that case, it is not necessary to limit the angle A3 to 90 degrees.

The inclination angle A2 given in advance to the flange portion 13a may be adjusted depending on the size of the interference of the frame 12a at the axial end of the iron core 10. In addition, as a preferable range of the inclination angle A2 of the flange part 13a from the viewpoint of the above explanation, the flange part 13a is set at least with respect to the vertical plane in the axial direction so that an effect of mitigating the inclination of the cylindrical part of the frame 12a toward the inner diameter side is obtained. It is preferable to set the angle of inclination so that it is inclined toward the side opposite to the portion 13a and within a range perpendicular to the tapered portion of the frame 12a.

In this way, by shaping the frame 12a by deforming it in the opposite direction before press-fitting the core 10, the frame 12a can be shaped into an appropriate shape after the core 10 is press-fitted. In this way, there is no need to provide excessive rigidity to the thick wall portion 21a of the frame 12a, so it is possible to contribute to reducing the size and weight of the frame 12a and to improve the reliability of the rotating electric machine. This is because it is possible to prevent the generation of a gap between the flange portion 13a and the case 3 and the loss of airtightness of the cooling medium flow path due to unplanned deformation of the frame 12a due to the press-fitting of the iron core 10.

In addition, in the examples of Embodiment 1 and Embodiment 2 described above, the formation area of the cooling medium flow path 6 formed between the frames 12, 12a and the case 3 overlaps with the iron core 10 in the axial direction. It was explained as being within the area. However, in order to improve cooling performance, the cooling medium flow path 6 may be provided outside the region overlapping with the iron core 10. In that case, the O-ring 14 may also be arranged outside the region overlapping with the iron core 10.

Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments may be applicable to a particular embodiment. The present invention is not limited to, and can be applied to the embodiments alone or in various combinations. Accordingly, countless variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, this includes cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of other embodiments.

1 Rotor, 2 Stator, 3 Case, 6 Coolant channel, 10 Iron core, 12, 12a Frame, 13, 13a Flange portion, 14 O-ring, 16 Convex portion, 20 Stator support portion, 20a Stator support axial center part, 20b stator support part axial end part, 21, 21a thick wall part, 50 rotating electric machine

Claims (12)

rotor,
a cylindrical stator disposed surrounding the outer periphery of the rotor;
a stator support part that is arranged on the outer peripheral side of the stator and whose inner diameter gradually increases from the axial center part to the axial end part; and a flange that is provided at one axial end part and extends radially outward. and a thick walled portion formed across one end of the stator in the axial direction;
A rotating electric machine including a case that supports the frame from an outer periphery and is coupled to the flange portion to fix the frame ,
The flange portion of the frame is provided with a radially outer side inclined toward the other side in the axial direction with respect to a plane perpendicular to the axial direction,
In the frame, the angle at which the radially outer side of the flange portion is inclined toward the other axial side with respect to a plane perpendicular to the axial direction is such that the inner diameter of the stator support portion is inclined from an axially central portion to an axially end portion. A rotating electric machine in which a tapered portion that gradually increases in size corresponds to the angle at which it is inclined with respect to the axial direction . The rotating electrical machine according to claim 1, wherein the thick wall portion of the frame continues to the flange portion. The stator support portion of the frame has a difference between an inner diameter radius at the axial center portion and an inner diameter radius at the axial end portion, which is the interference between the axial center portion of the stator support portion and the stator. The rotating electric machine according to claim 1 or 2, which is smaller than the above. The rotating electric machine according to any one of claims 1 to 3, wherein the stator support portion of the frame has a uniform inner diameter portion having a constant inner diameter at an axial center portion. The rotating electric machine according to any one of claims 1 to 4, wherein the frame is provided with a circumferential convex portion supported by the inner periphery of the case on the outer periphery side of the stator support portion. The stator support portion of the frame has a uniform inner diameter portion having a constant inner diameter at an axial center portion,
The rotating electric machine according to claim 5, wherein the convex portion of the frame is provided on an outer periphery closer to an axial end than the uniform inner diameter portion. The rotating electric machine according to claim 5 or 6, wherein the thick portion of the frame also serves as at least one of the protrusions. The rotating electric machine according to any one of claims 5 to 7, wherein the convex portion of the frame is provided with a sealing member. The rotating electric machine according to any one of claims 1 to 8, wherein a cooling medium flow path is provided between an outer periphery of the frame and an inner periphery of the case. In the frame, the angle at which the radially outer side of the flange portion is inclined toward the other side in the axial direction with respect to a plane perpendicular to the axial direction is the same as the angle at which the tapered portion of the stator support portion is inclined with respect to the axial direction. The rotating electric machine according to any one of claims 1 to 9 . rotor,
a cylindrical stator disposed surrounding the outer periphery of the rotor;
a stator support part that is arranged on the outer peripheral side of the stator and whose inner diameter gradually increases from the axial center part to the axial end part; and a flange that is provided at one axial end part and extends radially outward. and a thick walled portion formed across one end of the stator in the axial direction;
A rotating electric machine including a case that supports the frame from an outer periphery and is coupled to the flange portion to fix the frame,
The stator support portion of the frame has a uniform inner diameter portion having a constant inner diameter at an axial center portion,
In the rotating electric machine, the thick portion of the frame is provided in a region that overlaps in the axial direction with a region of the stator support portion where the inner diameter gradually increases, excluding the uniform inner diameter portion. 12. A sealing member for sealing between the frame and the case is provided in a region on the outer peripheral side of the stator support portion of the frame and corresponding to both ends of the stator in the axial direction. Rotating electric machine.

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