JP5656758B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  A conventional rotating electrical machine includes a rotor having a permanent magnet and a stator around which a coil is wound. For example, in an electric motor that is a type of rotating electrical machine, when a current flows through a coil, the rotor rotates due to an interaction between a magnetic field generated in the stator and a magnetic field generated by a permanent magnet. The rotor and the stator generate heat due to the influence of magnetic flux penetrating through the rotor and the stator or the electric resistance of the coil. In addition, the permanent magnet attached to the rotor also generates heat. Such heat generation affects the magnetic flux penetrating the inside of the electric motor, and reduces the operating efficiency of the electric motor. In order to cool the electric motor, in the invention described in Patent Document 1, cooling oil flowing inside the rotor is supplied.

JP-A-11-206063

However, the supplied cooling oil may enter a gap between the rotor and the stator due to capillary action. Here, drag loss occurs due to the cooling oil that has entered the air cap between the rotor and the stator. And there is a possibility that power loss due to an increase in the rotational torque of the rotor may occur. In addition, since the power loss is converted into heat, the cooling performance of the motor is affected.
On the other hand, an air-cooled electric motor does not require a pump for supplying cooling oil or the like. However, in the case of an air-cooled electric motor, the cooling gas does not pass to the inside of the rotor, so that the cooling performance is insufficient.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine that improves cooling performance in an air-cooled rotating electrical machine.

  According to the first aspect of the present invention, the rotating electrical machine that cools the rotor with the cooling gas includes the case, the stator, the rotor, and the shaft. The case has a tubular portion and a bottom portion provided at an end portion in the axial direction of the tubular portion, and forms an outer shell. The stator is accommodated inside the case, and a winding is wound around it. The rotor is provided on the radially inner side of the stator and is rotatable relative to the stator. The shaft is a rotation axis of the rotor and rotates together with the rotor.

Here, the rotor communicates with a suction port opened to the position of the shaft side in the radial direction of the rotor, a discharge port opened to the position of the stator side in the radial direction of the end face in the axial direction of the rotor, the inlet and outlet And a communication passage.
Thus, when the rotor rotates, the cooling gas cools the rotor by flowing from the suction port to the discharge port via the communication path by centrifugal action. For this reason, since cooling gas passes to the inside of a rotor, the cooling effect of cooling gas can be heightened.

The rotary electric machine Ru further includes a plate portion. Rotor, the position of the shaft side of the discharge opening in the radial direction of the rotor, collision strip portion than the end portion in the axial direction of the rotor protrudes to the bottom side of the case Ru extending from the radially inner side to the outer is formed . The plate portion is located between the rotor and the bottom portion, and a central hole having an inner diameter smaller than the outer diameter of the rotor is formed at the center, and partitions the cooling gas flow on the bottom side and the cooling gas flow on the rotor side.
Thereby, when a rotor rotates with a shaft, cooling gas will circulate in the space between a rotor and a bottom part by rotation of a protrusion part.

The case is formed on the inner wall of at least one of the bottom portion and the cylindrical portion along the radial direction to guide the flow of the cooling gas, and the case is formed along the axial direction to flow the cooling gas. It has at least one of the axial direction guide parts to guide.
Thereby, the heat transfer area of a case can be increased. For this reason, the amount of heat exchange between the cooling gas and the case can be increased. Therefore, the cooling performance of the rotating electrical machine can be enhanced.

According to the invention of claim 3, at least one of the radial guide portion and the axial guide portion is formed in a rib shape along the inner wall of the case.
According to the invention of claim 4, at least one of the radial guide portion provided on the inner wall of the bottom portion and the axial guide portion provided on the inner wall of the tube portion is arranged along the inner wall of the case. A plurality of protrusions.

  Here, making the radial guide part or the axial guide part into a rib shape is easier to manufacture than making the radial guide part or the axial guide part a plurality of protrusions. In addition, making the radial guide portion or the axial guide portion a plurality of protrusions is advantageous for increasing the heat transfer area of the case as compared to making the radial guide portion or the axial guide portion rib-like. It is.

According to the invention of claim 5, the axial direction guide portion is provided integrally with the radial direction guide portion provided on the inner wall of the bottom portion, and is formed in a rib shape along the axial direction so as to have a predetermined distance from the inner wall of the cylindrical portion. ing.
Thereby, when assembling the bottom part to the cylinder part, the radial direction guide part and the axial direction guide part can be assembled together with the bottom part, and the assemblability can be improved.

According to the invention of claim 6, at least one of the radial guide portion provided on the inner wall of the bottom portion and the axial guide portion provided on the inner wall of the tube portion is formed along the inner wall of the case. It is a groove.
Accordingly, the heat transfer area of the case can be increased without hindering insertion of the stator into the case. The stator and the case can be easily assembled while increasing the heat transfer area of the case.

According to the invention which concerns on Claim 7, a stator has an end part which protrudes in the axial direction bottom part side from the axial direction edge part of a rotor. The plate portion is provided so as to contact the radially inner side of the end portion.
Thereby, the partition effect between the cooling gas near the rotor and the cooling gas near the case can be enhanced, and the cooling effect due to the circulation of the cooling gas can be further enhanced.

According to the invention which concerns on Claim 8, a stator has an end part which protrudes in the axial direction bottom part side from the axial direction edge part of a rotor. The radial guide portion has a protruding portion formed to protrude toward the rotor side. The plate portion is provided in contact with the end portion on the rotor side in the axial direction of the protruding portion so as to have a predetermined distance from the end portion in the radial direction.
Thereby, since a board part and a stator are not connected, a board part can be comprised with a metal. Moreover, the heat resistance and durability of a board part can be improved by comprising a board part with a metal.

According to the invention which concerns on Claim 9, a protrusion part is extended linearly from radial direction inner side to radial direction outer side.
Thereby, it can suppress that the flow of a cooling gas is disturb | confused in the circumferential direction, and can stabilize the flow from the inner side of the radial direction of a cooling gas to the outer side of a radial direction.

According to the invention which concerns on Claim 10, a protrusion part is extended spirally from radial direction inner side toward radial direction outer side.
Thereby, the resistance of the air to the rotation of the rotor can be reduced, and the stability of the rotation of the rotor can be increased.

Sectional drawing which shows the characteristic of 1st Embodiment of this invention. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG. IV-IV sectional view taken on the line of FIG. The VV sectional view taken on the line of FIG. The VI-VI sectional view taken on the line of FIG. The VII-VII sectional view taken on the line of FIG. Sectional drawing which shows the characteristic of 2nd Embodiment of this invention. Sectional drawing which shows the characteristics of 3rd Embodiment of this invention. Sectional drawing which shows the characteristics of 3rd Embodiment of this invention. Sectional drawing which shows the characteristics of 4th Embodiment of this invention. XII-XII sectional view taken on the line of FIG. XIII-XIII sectional view taken on the line of FIG. Sectional drawing which shows the characteristics of 5th Embodiment of this invention. XV-XV sectional view taken on the line of FIG. Sectional drawing which shows the characteristics of 6th Embodiment of this invention. XVII-XVII sectional view taken on the line of FIG.

  Hereinafter, an embodiment of an electric motor which is a kind of “rotating electric machine” according to the present invention will be described with reference to the drawings. In the embodiment of the present invention, for convenience of explanation, in FIGS. 1, 5, 9, 11, 14, and 16, the left side is “front” and the right side is “rear”.

(First embodiment)
An electric motor according to a first embodiment of the present invention is shown in FIGS. As shown in FIG. 1, the electric motor 1 includes a case 70, a stator 80, a rotor 10, and a shaft 90. In the case of the present embodiment, the electric motor 1 further includes an axial rib portion 74, a radial rib portion 75, a ridge portion 19, and a plate portion 85, thereby achieving cooling by air circulation. Here, air corresponds to “cooling gas” in the claims.

  The case 70 includes a cylindrical portion 71, a front bottom portion 72, and a rear bottom portion 73, and forms an outline of the electric motor 1. The stator 80 is provided on the radially inner side of the cylindrical portion 71 and includes a stator iron core 81 and a stator coil 83. The stator iron core 81 is formed by laminating a plurality of stator steel plates 82, and the stator coil 83 is wound so as to constitute a plurality of phases. Here, a portion of the stator core 81 that protrudes from both sides in the axial direction is defined as a coil end 84. Here, the coil end 84 corresponds to an “end portion” in the claims.

  The rotor 10 is provided on the radially inner side of the stator 80, and includes a rotor core 16, a front end plate 17 provided on the front side of the rotor core 16, and a rear end plate provided on the rear side of the rotor core 16. 18 is provided. The rotor core 16 is configured by laminating the rotor steel plates 161 and is fixed to a shaft 90 penetrating the center. As shown in FIG. 7, a magnet 95 is fitted radially outside in the rotor iron core 16.

Here, the cooling structure of the rotor 10 of the present embodiment will be described in detail with reference to FIGS. 1, 2, and 3.
As shown in FIG. 1, the front end plate 17 and the rear end plate 18 of the rotor 10 are provided with a plurality of protrusions 19. The protruding portion 19 is formed so as to extend linearly from the radially inner side to the outer side of the front end plate 17 and the rear end plate 18. In addition, as shown in FIG. 2, the plurality of protrusions 19 are formed radially when viewed from the axial direction.

  Plate portions 85 are provided between the front bottom portion 72 and the ridge portion 19 of the front end plate 17 and between the rear bottom portion 73 and the ridge portion 19 of the rear end plate 18. The plate portion 85 is provided in close contact with the radially inner side of the coil end 84. The plate portion 85 is made of, for example, resin and has a central hole 851 at the center (see FIG. 3). Here, the central hole 851 is formed such that the inner diameter d1 is smaller than the outer diameter d2 of the rotor 10.

  A plurality of radial rib portions 75 are formed on the inner walls of the front bottom portion 72 and the rear bottom portion 73. The radial rib portion 75 protrudes from the inner walls of the front bottom portion 72 and the rear bottom portion 73 toward the rotor 10 and extends along the radial direction. Further, the plurality of radial rib portions 75 are formed radially when viewed from the axial direction (see FIG. 4). Here, the radial direction rib part 75 respond | corresponds to the "radial direction guide part" in a claim.

  A plurality of axial rib portions 74 are provided on the inner wall of the cylindrical portion 71. The axial rib portion 74 protrudes from the inner wall of the cylindrical portion 71 toward the coil end 84 and extends along the axial direction. The plurality of axial rib portions 74 are formed at equal intervals in the circumferential direction so as to be parallel to each other (see FIGS. 4 and 5). In the present embodiment, after the stator 80 is assembled to the case 70, the axial rib portion 74 is provided on the inner wall of the cylindrical portion 71. The axial rib portion 74 corresponds to an “axial guide portion” in the claims.

  As shown in FIG. 6, the front end plate 17 has a plurality of suction ports 11, a front radial groove 12, and a front circumferential groove 15. The plurality of suction ports 11 are holes that penetrate the front end plate 17 and are formed on the shaft side. In the present embodiment, the plurality of suction ports 11 are formed in the vicinity of the shaft 90 at the same interval.

  The front radial groove 12 and the front circumferential groove 15 are formed on the rear side of the front end plate 17. The front radial groove 12 is formed radially around the shaft 90, one end is connected to the suction port 11, and the other end is connected to the front circumferential groove 15. The front circumferential groove 15 is formed along the radially outer chord of the front end plate 17 and is connected to the front radial groove 12 at the middle portion in the chord direction.

  As shown in FIG. 7, the rotor steel plate 161 has a plurality of magnet accommodation holes 130 on the stator 80 side. In addition, the rotor steel plates 161 are laminated to form the rotor core 16, whereby the plurality of magnet accommodation holes 130 are stacked to accommodate the magnets 95 in the axial direction. At this time, gaps 131 and 132 are formed between the magnet 95 and the magnet housing hole 130, and the plurality of gaps 131 and 132 are overlapped to form the axial passage 13 as shown in FIG. Further, the magnet accommodation hole 130 of the rotor steel plate 161 and the front circumferential groove 15 of the front end plate 17 have the same distance in the radial direction from the shaft 90 and are formed to be able to face each other. Therefore, when the front end plate 17 and the rotor core 16 are combined, the front circumferential groove 15 of the front end plate 17 and the axial passage 13 of the rotor core 16 are connected to each other. Here, the communication path formed by the front radial groove 12, the front circumferential groove 15, and the axial path 13 corresponds to a "communication path" in the claims.

  Further, as shown in FIG. 1, the rear end plate 18 has a discharge port 14 opened on the stator 80 side. The discharge port 14 is opened on the side of the stator 80 that is separated from the shaft 90. Further, the discharge port 14 of the rear end plate 18 and the gaps 131 and 132 of the magnet housing hole 130 of the rotor steel plate 161 have the same distance in the radial direction from the shaft 90 and are formed to be able to face each other. Therefore, when the rear end plate 18 and the rotor core 16 are combined, the discharge port 14 of the rear end plate 18 and the axial passage 13 of the rotor core 16 are connected to each other.

  On the other hand, the shaft 90 penetrates through the center of the rotor 10 and is rotatably supported by the front bottom portion 72 and the rear bottom portion 73 of the case 70. A bearing 91 is interposed between the shaft 90 and the front bottom portion 72 and the rear bottom portion 73 of the case 70.

Then, the action | operation of the electric motor 1 of this embodiment is demonstrated.
When the electric motor 1 is turned on, a current flows through the stator coil 83. Torque for rotating the rotor 10 is generated by the relationship between the magnetic force generated by the current flowing through the stator coil 83 and the magnetic force of the magnet 95. Due to this torque, the rotor 10 fixed to the shaft 90 rotates together with the shaft 90.

  When the rotor 10 rotates, the pressure on the radially inner side in the front radial groove 12 of the rotor 10 becomes lower than the pressure outside the rotor 10 due to centrifugal force. Further, the pressure outside the radial direction in the front radial groove 12 of the rotor 10 is higher than the pressure outside the rotor 10. Therefore, air is sucked from the suction port 11 of the rotor 10 and is discharged from the discharge port 14 via the front radial groove 12, the front circumferential groove 15, and the axial passage 13.

  The cooling fluid in the vicinity of the rotor 10 flows from the radially inner side to the radially outer side along the protruding portion 19, is guided by the axial rib portion 74 of the cylindrical portion 71, and is radial along the radial rib portion 75. Circulates from the outside to the inside in the radial direction.

Hereinafter, the effect of this embodiment will be described.
In the present embodiment, the rotor 10 is cooled by air flowing through the communication passage formed by the front radial groove 12, the front circumferential groove 15, and the axial passage 13. Further, since the suction port 11 is opened on the shaft 90 side and the discharge port 14 is opened on the stator 80 side, air is sucked from the suction port 11 due to a pressure difference between the radially inner side and the radially outer side, and the discharge port 14 is discharged. For this reason, the inside of the rotor 10 can be cooled.

  Further, since the axial passage 13 formed by the gaps 131 and 132 of the magnet accommodation hole 130 is formed in the vicinity of the magnet 95, the magnet 95 is cooled by the air flowing through the axial passage 13.

  In the present embodiment, the air between the front end plate 17 and the front bottom portion 72 and the air between the rear end plate 18 and the rear bottom portion 73 are circulated by the rotation of the protrusion 19. Thereby, the air which became high temperature by exchanging heat with the rotor 10 is cooled by the case 70 connected to the outside. Therefore, the cooling performance of air can be improved.

  The air near the rotor 10 and the air near the case 70 are partitioned by a plate portion 85. Thereby, it can suppress that the flow of air is disturbed to an axial direction. Therefore, the cooling effect by air circulation can be enhanced.

  Further, the plate portion 85 is in close contact with the radially inner side of the coil end 84. Thereby, the partition effect between the air near the rotor 10 and the air near the case 70 can be enhanced, and the cooling effect by the circulation of air can be further enhanced.

  In the present embodiment, the axial rib portion 74 and the radial rib portion 75 are formed on the inner wall of the case 70. Thereby, the heat transfer area of a case can be increased. For this reason, the amount of heat exchange between the air and the case 70 can be increased. Therefore, the cooling performance of the electric motor can be enhanced.

(Second Embodiment)
An electric motor according to a second embodiment of the present invention is shown in FIG. FIG. 8 is a view of the front end plate 17 as viewed from the axial direction.
As shown in FIG. 8, the front end plate 17 is formed with a protrusion 192 protruding in the axial direction. The protrusion 192 is formed to extend in a spiral shape from the radially inner side to the radially outer side.
Thereby, the resistance of the air with respect to rotation of the rotor 10 can be reduced, and the rotation stability of the rotor 10 can be enhanced.

(Third embodiment)
An electric motor according to a third embodiment of the present invention is shown in FIGS. 9 is a cross-sectional view of the inner wall of the cylindrical portion 71 of the electric motor 3 as viewed from the radial direction, and FIG. 10 is a cross-sectional view of the inner wall of the front bottom portion 72 of the electric motor 3 as viewed from the axial direction.

  As shown in FIG. 9, a plurality of protrusions 76 arranged at equal intervals along the axial direction are formed on the inner wall of the cylindrical portion 71. In addition, the plurality of protrusions 76 have the same interval in the circumferential direction. As shown in FIG. 10, a plurality of protrusions 77 arranged at equal intervals along the radial direction are formed on the inner wall of the front bottom portion 72. The plurality of protrusions 77 are arranged radially when viewed from the axial direction.

  Thereby, 3rd Embodiment can increase the heat-transfer area of case 70 compared with the said 1st Embodiment. For this reason, the amount of heat exchange between the air and the case 70 can be further increased.

(Fourth embodiment)
An electric motor according to a fourth embodiment of the present invention is shown in FIG. 11, FIG. 12, and FIG. FIG. 11 is a cross-sectional view of the electric motor 4 of the present embodiment. 12 is a cross-sectional view taken along line XII-XII in FIG. 11, and FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG.

As shown in FIGS. 11 and 12, a plurality of axial grooves 78 are formed in the inner wall of the cylindrical portion 71. The axial groove 78 is recessed in the radial direction of the inner wall of the cylindrical portion 71 and is formed along the axial direction. The plurality of axial grooves 78 have the same interval in the circumferential direction.
A plurality of radial grooves 79 are formed in the inner wall of the front bottom portion 72. The plurality of radial grooves 79 are recessed in the axial direction of the inner wall of the front bottom portion 72 and are formed radially when viewed from the axial direction. A plurality of radial grooves 79 are similarly formed on the inner wall of the rear bottom 73 (see FIG. 13).

  Thereby, it is possible to increase the heat transfer area of the case 70 without hindering insertion of the stator 80 into the case 70. Therefore, the stator 80 and the case 70 can be easily assembled while increasing the heat transfer area of the case 70.

(Fifth embodiment)
An electric motor according to a fifth embodiment of the present invention is shown in FIGS. FIG. 14 shows a cross-sectional view of the rear bottom portion 73 of the electric motor 5 of the present embodiment. 15 is a cross-sectional view taken along line XV-XV in FIG.

  In the present embodiment, a plurality of radial rib portions 731 and axial rib portions 732 are integrally formed on the inner wall of the rear bottom portion 73. As shown in FIGS. 14 and 15, the axial rib portion 732 protrudes in the axial direction from the end of the radial rib portion 731 on the cylindrical portion 71 side, and is formed to have a predetermined distance from the inner wall of the cylindrical portion 71. Yes. The plurality of axial rib portions 732 are formed to be parallel to the inner wall of the cylindrical portion 71.

  Accordingly, when the rear bottom portion 73 is assembled to the cylindrical portion 71, the radial rib portion 731 and the axial rib portion 732 can be assembled together with the rear bottom portion 73. Therefore, the assembling property can be improved as compared with the first embodiment.

(Sixth embodiment)
An electric motor according to a sixth embodiment of the present invention is shown in FIGS. 16 is a cross-sectional view of the electric motor 6 of the present embodiment, and FIG. 17 is a cross-sectional view taken along the line XVII-XVII in FIG.

  As shown in FIG. 16, the radial rib portion 751 is formed with a protruding portion 752 that protrudes toward the rotor 10 in the axial direction on the shaft 90 side. In the case of the present embodiment, the plate portion 86 is provided on the protruding portion 752 so as to have a predetermined distance from the coil end 84. Here, the predetermined interval may be a gap that does not contact the plate portion 86 and the coil end 84. The plate portion 86 is made of a good heat conductive metal such as aluminum.

  In the sixth embodiment, since there is a predetermined interval between the plate portion 86 and the coil end 84, the plate portion 86 can be formed of metal. Therefore, the heat resistance and durability of the plate portion 86 are improved. Further, the thermal conductivity between the air in the vicinity of the rotor 10 and the air in the vicinity of the front bottom portion 72 and the rear bottom portion 73 can be increased, and the heat exchange efficiency can be increased.

(Other embodiments)
In the said embodiment, a protrusion part, a board part, and a radial direction guide part are provided in the axial direction both sides of the rotor. On the other hand, in other embodiments, the protrusion, the plate, and the radial guide may be provided on one side of the rotor in the axial direction.

  In the above embodiment, the radial rib portion is provided on the inner wall of the front bottom portion and the inner wall of the rear bottom portion, and the axial rib portion is provided on the inner wall of the cylindrical portion. On the other hand, in another embodiment, the radial rib portion may be provided on the inner wall of the cylindrical portion, and the axial rib portion may be provided on the inner wall of the front bottom portion and the inner wall of the rear bottom portion.

  In the embodiment described above, the axial rib portion is formed on the radial rib portion provided on the inner wall of the front bottom portion and the inner wall of the rear bottom portion. On the other hand, in another embodiment, it is good also as providing a radial direction rib part in the axial direction rib part currently formed in the cylinder part. Further, a radial rib portion is provided on the axial rib portion provided on the inner wall of the front bottom portion and the inner wall of the rear bottom portion, or the axial rib portion is provided on the radial rib portion provided on the inner wall of the cylindrical portion. It is good also as providing.

In the embodiment described above, the electric motor has been described as the rotating electric machine. On the other hand, you may apply this invention to generators other than an electric motor.
In the above embodiment, air is used as the cooling gas. In contrast, in another embodiment, a gas such as nitrogen or argon may be used as the cooling gas.
The present invention described above is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

1 ... Electric motor (rotary electric machine)
DESCRIPTION OF SYMBOLS 10 ... Rotor 11 ... Inlet 12 ... Front side radial groove 13 ... Axial passage 14 ... Release port 15 ... Front side circumferential groove 17 ... Front end plate 18 · Rear end plate 19 ··· Projection portion 70 ··· Case 71 ··· Tube portion 72 ··· Front side bottom portion 73 · · · Lower rear portion 74 ··· Axial rib portion (axial direction guide portion) )
75 ... Radial rib part (radial guide part)
76 ・ ・ ・ Protrusions (axial guides)
77 ・ ・ ・ Protrusions (radial guides)
78 ・ ・ ・ Axial groove (axial guide)
79 ... Radial groove (radial guide)
80 ... Stator 84 ... Coil end 85, 86 ... Plate part 90 ... Shaft 192 ... Projection part 721 ... Radial rib part (radial direction guide part)
722 ... Axial rib part (axial guide part)
751 ... Radial rib part (radial guide part)
752 ... Projection part 851 ... Central hole

Claims (10)

A case having a cylindrical portion and a bottom portion provided at an axial end portion of the cylindrical portion, and forming an outer shell;
A stator housed inside the case and wound with windings;
A rotor provided inside the stator in the radial direction and rotatable relative to the stator;
A rotating shaft of the rotor, the shaft rotating with the rotor;
A rotating electrical machine that cools the rotor with a cooling gas,
The rotor includes a suction port that opens at a position on the shaft side in the radial direction of the rotor, a discharge port that opens at a position on the stator side in the radial direction of the end surface in the axial direction of the rotor , and the suction port and the A communication passage that communicates with the discharge port, and projects radially inward from the end of the rotor in the axial direction at a position closer to the shaft than the discharge port in the radial direction of the rotor. and protrusions extending to the outside is formed from,
A central hole located between the rotor and the bottom and having an inner diameter smaller than the outer diameter of the rotor is formed at the center to partition the cooling gas flow on the bottom side and the cooling gas flow on the rotor side. A rotating electrical machine further comprising a plate portion.   The case is formed on the inner wall of at least one of the bottom portion and the cylindrical portion along the radial direction to guide the flow of the cooling gas, and the case is formed along the axial direction to form the cooling gas. The rotating electrical machine according to claim 1, wherein at least one of the axial direction guide portions for guiding the flow of the motor is provided.   The rotating electrical machine according to claim 2, wherein at least one of the radial guide portion and the axial guide portion is formed in a rib shape along an inner wall of the case.   At least one of the radial direction guide portion provided on the inner wall of the bottom portion and the axial direction guide portion provided on the inner wall of the cylindrical portion is a plurality of arranged along the inner wall of the case The rotating electrical machine according to claim 2, comprising a protrusion.   The axial guide portion is provided integrally with the radial guide portion provided on the inner wall of the bottom portion, and is formed in a rib shape along the axial direction so as to have a predetermined distance from the inner wall of the cylindrical portion. The rotating electrical machine according to claim 2.   At least one of the radial guide portion provided on the inner wall of the bottom portion and the axial guide portion provided on the inner wall of the cylindrical portion is a groove formed along the inner wall of the case. The rotating electrical machine according to claim 2, wherein: The stator has an end portion that protrudes toward the bottom side in the axial direction from an end portion in the axial direction of the rotor,
The rotating electrical machine according to claim 1, wherein the plate portion is provided so as to contact a radially inner side of the end portion. The stator has an end portion that protrudes toward the bottom side in the axial direction from an end portion in the axial direction of the rotor,
The radial guide portion has a protrusion formed to protrude toward the rotor side,
The rotating electrical machine according to claim 2, wherein the plate portion is provided in contact with an end portion on the rotor side in the axial direction of the protruding portion so as to have a predetermined distance from the end portion in the radial direction. .   The rotating electrical machine according to any one of claims 1 to 8, wherein the protruding portion extends linearly from a radially inner side to a radially outer side.   The rotating electrical machine according to any one of claims 1 to 8, wherein the protruding portion extends spirally from a radially inner side to a radially outer side.

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