JP2016174443A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which is small and achieves excellent cooling performance.SOLUTION: A stator 6 is fixed to a housing 2 of an electric motor 1. A rotor shaft 8 is rotatably attached to the housing 2. A rotor 9 is fixed to the rotor shaft 8 so as to face the stator 6 in a radial direction. A sleeve member 10 contacts with an inner peripheral surface 6a of the stator 6. A pair of cover members 11 is sealed to an inner peripheral surface 10a of the sleeve member 10 at outer peripheral ends 11c. The rotor shaft 8 penetrates through shaft holes 11b of the cover members 11. Each shaft hole 11b is formed so as to rotate relatively to an outer peripheral surface 8a of the rotor shaft 8 and a seal is made between each shaft hole 11b and the outer peripheral surface 8a. The sleeve member 10 and the cover members 11 insulate the rotor 9 in the housing 2 to prevent a cooling oil from entering into a gap between the stator 6 and the rotor 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine that includes a rotor that rotates in a state of facing a stator in a radial direction in a housing, and that is supplied with a coolant in the housing.

  In a rotating electrical machine such as a motor or a generator, various heat is generated due to copper loss, iron loss, mechanical loss, and the like. The heat generation in the rotating electrical machine reduces the conversion efficiency between the electric energy and the mechanical energy. In recent years, in rotating electrical machines, an increase in output torque has been demanded, so improvement in cooling performance has been an important issue. Conventionally, various cooling methods have been proposed for a rotating electrical machine, but from the viewpoint of cooling performance, a rotating electrical machine that uses a liquid cooling system is superior to an air cooling system.

  Patent Document 1 describes a conventional technique related to a rotating electrical machine using a liquid cooling method. In the rotating electrical machine according to the related art, the slot portion and the coil end portion of the stator are isolated from other portions in the housing by using the cover member, and the cooling oil is introduced into the internal space of the cover member. For this reason, a cooling oil can be directly supplied to a stator coil without going through a stator core, and it can be set as the rotary electric machine excellent in the cooling performance of the stator coil. In addition, since the stator coil is isolated by the cover member, the cooling oil does not enter the gap between the stator and the rotor. Therefore, there is no dragging loss due to cooling oil in the rotor, and a rotating electrical machine with excellent energy conversion efficiency can be obtained.

Japanese Patent No. 2716286

However, in the rotary electric machine according to the above-described prior art, the space to which the cooling oil is supplied is limited to the periphery of the stator coil in the housing, so that the degree of freedom in handling the cooling oil supply path and the discharge path is high. However, the structure of the oil passage is complicated and the housing is enlarged. Further, since the cooling oil is not supplied to the bearing holding the rotor in a rotatable manner, mechanical loss occurs in the bearing, leading to a problem of heat generation of the bearing. About these points, it was contrary to the request | requirement with respect to the recent rotary electric machine, such as the miniaturization and the increase in rotational torque.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electrical machine that is small in size and excellent in cooling performance.

  In order to solve the above-described problem, the invention of the rotating electrical machine according to claim 1 is directed to a housing (2), a stator (6) fixed to an inner peripheral surface (2a) of the housing, and a rotating shaft with respect to the housing. (1) A rotating electrical machine (1) provided with a shaft (8) attached rotatably around (φ) and a rotor (9) fixed to the shaft so as to face radially inward with respect to the stator 1A), the sleeve portion (10) extending in the direction of the rotation axis in a state of being opposed to the inner peripheral surface (6d) of the stator, and the rotor being disposed so as to sandwich the rotor in the direction of the rotation axis. The end (11c) is sealed between the sleeve portion and the inner peripheral end (11b) is sealed between the outer peripheral surface (8a) of the shaft or the end portion (9b) in the rotational axis direction of the rotor. Is Thus, together with the sleeve portion, a pair of cover portions (11) for isolating the rotor in the housing, and a portion other than the rotor space (DSP) formed in the housing and isolated by the sleeve portion and the cover portion in the housing And a supply path (5a, 5b) for introducing a coolant from the outside.

  According to this configuration, the rotor is disposed so as to sandwich the rotor in the direction of the rotation axis by both the sleeve portion extending in the direction of the rotation axis in a state of being opposed to the inner peripheral surface of the stator. A pair of covers that are sealed between the outer peripheral surface of the shaft or the rotational axis direction end of the rotor at each inner peripheral end and isolate the rotor in the housing together with the sleeve portion And a supply path through which coolant is introduced from the outside, communicating with a portion of the housing other than the rotor space separated by the sleeve portion and the cover portion. As a result, the cooling liquid is supplied to all parts other than the isolated rotor in the housing, so that a degree of freedom is generated at a position where the cooling liquid supply path and the discharge path are provided. Therefore, the supply path and the discharge path can be easily formed, and the housing can be reduced in size. Further, since there is no fear that the coolant enters the gap between the stator and the rotor, the drag loss of the rotor can be reduced and the output torque is increased.

Typical sectional drawing at the time of cutting along the rotating shaft of the electric motor by Embodiment 1 of this invention II-II sectional view in FIG. Part III enlarged view in FIG. The partial cross section figure which showed the modification of the cover member of Embodiment 1 Schematic sectional view when cut along the rotation axis of the deceleration system using the electric motor shown in FIG. Typical sectional drawing of the electric motor by Embodiment 2 Schematic sectional view of a deceleration system as a comparative example of FIG.

<Configuration of Embodiment 1>
Based on FIG. 1 thru | or FIG. 5, the electric motor 1 (corresponding to a rotary electric machine) by Embodiment 1 of this invention is demonstrated. In FIG. 1, the rotation axis φ indicates the rotation center of the rotor shaft 8 (corresponding to the shaft), and in the following description, the direction in which the rotation axis φ extends is simply referred to as the rotation axis direction. 1 or 5 corresponds to the upper side of the electric motor 1 or the speed reduction system 20, and the lower side in FIG. 1 or FIG. 5 corresponds to the lower side of the electric motor 1 or the speed reduction system 20. Furthermore, the direction approaching the rotor shaft 8 from the outer periphery of the electric motor 1 is referred to as a radially inward direction.
For the electric motor 1 according to the present embodiment, any electric motor such as a brushless DC motor, a synchronous motor, an induction motor, a reluctance motor, or the like can be used. Further, the electric motor 1 can be applied to various uses such as driving an in-vehicle device, driving a general industrial machine, driving a household electric machine, and the like.

  As shown in FIG. 1, the housing 2 of the electric motor 1 is made of an aluminum alloy or a resin material having good thermal conductivity. The housing 2 is formed by engaging the housing body 3 and the motor cover 4. The housing body 3 includes a cylindrical portion 3a having a substantially cylindrical shape, and an end wall portion 3b connected to one end of the cylindrical portion 3a. On the other hand, the motor cover 4 is formed by a shaft wall 4a fitted to the inner peripheral surface of the cylindrical portion 3a and a bottom portion 4b connected to the shaft wall 4a.

  A supply oil passage 5a (corresponding to the supply passage) extending in the rotation axis direction is formed between the cylindrical portion 3a of the housing body 3 and the shaft wall 4a of the motor cover 4. The supply oil path 5a is formed in the upper part of the housing 2, and cooling oil (corresponding to a cooling liquid) is introduced from the outside. In the housing 2, a coolant may be supplied instead of the cooling oil. The cooling oil introduced into the supply oil passage 5 a is supplied into the housing 2 through a plurality of oil holes 5 b (corresponding to the supply passage) formed in the shaft wall 4 a of the motor cover 4. The cooling oil in the housing 2 is discharged to the outside through a discharge hole 5 c formed at the bottom of the bottom portion 4 b of the motor cover 4.

A stator 6 is fixed to the inner peripheral surface 2a of the housing 2 by press fitting, shrink fitting, bolts or the like. The stator 6 includes a stator core 6a formed by laminating a plurality of electromagnetic steel plates 6a1 (corresponding to laminated steel plates), and a pair of stator end plates 6b (end plates) arranged at both ends in the rotation axis direction of the stator core 6a. Applicable).
As shown in FIG. 2, a plurality of core slots 6a2 and end plate slots 6b1 are formed on the circumference of the stator core 6a and the stator end plate 6b so as to penetrate the stator 6 in the rotation axis direction. Yes. The core slot 6a2 and the end plate slot 6b1 correspond to slots. The stator 6 includes a stator coil 6c wound around each core slot 6a2 and end plate slot 6b1. The stator coil 6c is wound so as to straddle a plurality of core slots 6a2 and end plate slots 6b1, respectively.

  As shown in FIG. 1, a body bearing hole 3 c and a cover bearing hole 4 c pass through the end wall portion 3 b of the housing body 3 and the bottom portion 4 b of the motor cover 4 at substantially the center. Bearings 7 are fixed to the body bearing hole 3c and the cover bearing hole 4c, respectively. The rotor shaft 8 is attached to the housing 2 via the bearing 7 so as to be rotatable about the rotation axis. The rotor 9 is fixed to the rotor shaft 8 so as to face the stator 6 inward in the radial direction with a predetermined gap. As with the stator 6, the rotor 9 includes a rotor core 9a formed of a plurality of laminated steel plates 9a1, and a pair of rotor end plates 9b (ends in the rotational axis direction of the rotor) disposed at both ends in the rotational axis direction of the rotor core 9a. Corresponding to the part). In addition, a plurality of field magnets (not shown) are arranged in the rotor core 9a. In the configuration described so far, a rotating magnetic field is generated by supplying electric power to the stator coil 6c, and the rotor 9 is rotated by the attractive force and the repulsive force generated accordingly.

  A sleeve member 10 (corresponding to a sleeve portion) is attached to the inner peripheral surface 6 d of the stator 6. The sleeve member 10 is formed in a substantially cylindrical shape by a nonmagnetic material such as a synthetic resin material or a ceramic material. The sleeve member 10 extends in the rotation axis direction in a state of facing the inner peripheral surface 6 d of the stator 6. The sleeve member 10 prevents the cooling oil from flowing into the rotor 9 from the core slot 6 a 2 and end plate slot 6 b 1 side of the stator 6. In this embodiment, the sleeve member 10 is in contact with the inner peripheral surface 6d of the stator 6. However, if the cooling oil can be prevented from flowing into the rotor 9, the sleeve member 10 and the inner peripheral surface 6d of the stator 6 There may be a gap between them.

  A pair of cover members 11 (corresponding to a cover portion) are disposed on the rotor shaft 8 so as to sandwich the rotor 9 in the direction of the rotation axis. Each cover member 11 is formed in a substantially bowl shape by a synthetic resin material, a ceramic material, or a metal material, and a shaft hole 11b (corresponding to an inner peripheral end) through which the rotor shaft 8 passes is formed in the bottom portion 11a. Is provided. Each cover member 11 has an outer peripheral end 11 c sealed against the inner peripheral surface 10 a of the sleeve member 10. The outer peripheral end 11 c of the cover member 11 may be sealed with respect to the outer peripheral surface of the sleeve member 10. Further, the shaft hole 11 b of each cover member 11 is sealed between the outer peripheral surface 8 a of the rotor shaft 8. Thus, the pair of cover members 11 together with the sleeve member 10 isolate the rotor 9 in the housing 2 (corresponding to the inside of the housing). A rotor space DSP isolated by the sleeve member 10 and the cover member 11 is formed around the rotor 9. The oil hole 5b described above communicates with a portion other than the rotor space DSP in the housing 2 (corresponding to a portion other than the rotor space), and the supplied cooling oil does not enter the rotor space DSP.

As shown in FIG. 3, a ring-shaped annular groove 11 d is formed on the outer peripheral end 11 c of each cover member 11. An O-ring 12 (corresponding to a seal member) made of a synthetic rubber material is disposed in both annular grooves 11d. By inserting both cover members 11 each having an O-ring 12 into the inner peripheral surface 10 a of the sleeve member 10, an O-ring is formed between the outer peripheral end 11 c of the cover member 11 and the inner peripheral surface 10 a of the sleeve member 10. 12 is compressed. Thereby, the outer peripheral end 11c of the cover member 11 is fixed to the inner peripheral surface 10a of the sleeve member 10, and the O-ring 12 interposed between the cover member 11 and the sleeve member 10 is between the two. Seal. The sleeve member 10 is pressed against the inner peripheral surface 6 d of the stator 6 by the urging force from the O-ring 12. Each O-ring 12 is disposed at a position that coincides with the stator end plate 6b in the rotation axis direction.
On the other hand, a non-contact seal portion 13 made of a magnetic fluid seal or a labyrinth seal is formed between the shaft hole 11 b of the cover member 11 and the outer peripheral surface 8 a of the rotor shaft 8. The shaft hole 11 b is formed by the non-contact seal portion 13 so as to be rotatable relative to the outer peripheral surface 8 a of the rotor shaft 8. The inner peripheral end of the cover member 11 may be sealed by the non-contact sealing portion 13 so as to be rotatable relative to the rotor end plate 9b (shown in FIG. 4).

Each component of the electric motor 1 described so far is accommodated in the reducer housing 2A as shown in FIG. A reduction gear 14 is accommodated in the reduction gear housing 2 </ b> A, and a reduction shaft 14 a of the reduction gear 14 is rotatably supported by the reduction gear housing 2 </ b> A via a bearing 7. The rotor shaft 8 is connected to a speed reducer 14, and the driving force of the rotor 9 is decelerated by the speed reducer 14 and output to the reduction shaft 14a.
The hydraulic pump 15 in the deceleration system 20 discharges the cooling oil to the supply oil passage 5a. The cooling oil discharged to the supply oil passage 5a is supplied into the reduction gear housing 2A through the plurality of oil holes 5b. The cooling oil stores heat below the reduction gear housing 2 </ b> A after absorbing heat from the stator 6 and the reduction gear 14 of the electric motor 1. The hydraulic pump 15 sucks the cooling oil from the discharge hole 5c and discharges it again to the supply oil passage 5a. The supplied cooling oil is formed to be movable in the direction of the rotation axis on the stator 6 via the core slot 6a2 and the end plate slot 6b1 (shown in FIG. 1).

<Effect of Embodiment 1>
According to the electric motor 1 according to the present embodiment, the sleeve member 10 extending in the rotational axis direction in contact with the inner peripheral surface 6d of the stator 6 and each outer peripheral end 11c are on the inner peripheral surface 10a of the sleeve member 10. On the other hand, a pair of cover members 11 for isolating the rotor 9 in the housing 2 together with the sleeve member 10 by being sealed and sealed to the outer peripheral surface 8a of the rotor shaft 8 in each shaft hole 11b. A supply oil passage 5a and an oil hole 5b, which are formed in the housing 2 and communicate with parts other than the rotor space DSP in the housing 2 and separated by the sleeve member 10 and the cover portion 11, and for introducing cooling oil from the outside. I have. As a result, the cooling oil is supplied to all parts of the electric motor 1 other than the isolated rotor space DSP in the housing 2, so that the supply oil passage 5 a, the oil hole 5 b, and the discharge hole 5 c are provided in the housing 2. There is a degree of freedom in the position where the is provided. Therefore, it becomes easy to form the supply oil passage 5a, the oil hole 5b, and the discharge hole 5c, and the housing 2 can be downsized.

Also, in the housing 2, only the rotor 9 is isolated from the cooling oil supply. For this reason, cooling oil can be supplied also to the bearing 7, the mechanical loss in the bearing 7 can be reduced, and the cooling property is also improved.
Furthermore, in the electric motor 1, since there is no fear that the cooling oil enters the gap between the stator 6 and the rotor 9, the drag loss of the rotor 9 can be reduced and the output torque is increased. Although the electric motor 1 is any type of motor, the drag loss reduction effect appears, but the effect becomes significant in the SR (Switched Reluctance) motor in which many protrusions are formed on the outer peripheral surface of the rotor 9. .

As shown in FIG. 7, in the speed reduction system 21 that does not include the sleeve member 10 and the cover member 11 as a comparative example, the rotor 9 is not isolated from other parts in the speed reducer housing 2A. For this reason, a means different from the above-described embodiment must be taken so as to reduce the intrusion of the cooling oil into the gap between the stator 6 and the rotor 9 so as not to cause a drag loss. Therefore, in the speed reduction system 21 illustrated in FIG. 7, the cooling oil is prevented from being stored more than a predetermined height at the bottom of the speed reducer housing 2A. Therefore, in the speed reduction system 21, the reservoir tank 16 for cooling oil is required outside the speed reducer housing 2A, the hydraulic pump 15 that sucks the cooling oil from the discharge hole 5c and discharges it toward the reservoir tank 16, and the reservoir tank 16 It is necessary to separately provide a hydraulic pump 15 that sucks the cooling oil inside and supplies it to the supply oil passage 5a.
On the other hand, the speed reduction system 20 according to the present embodiment described above can use the speed reducer housing 2A as a reservoir tank because there is no risk of cooling oil entering the gap between the stator 6 and the rotor 9. Cooling oil can be stored at the bottom. Therefore, the reservoir tank 16 is not necessary and only one hydraulic pump 15 is required (shown in FIG. 5).

  Each cover member 11 has an outer peripheral end 11c fixed to the sleeve member 10, and is sealed so as to be rotatable relative to the outer peripheral surface 8a of the rotor shaft 8 in each shaft hole 11b. Thereby, the movable seal portion formed on the outer peripheral surface 8 a of the rotor shaft 8 can be made smaller in diameter than the fixed seal portion provided on the outer peripheral end 11 c of the cover member 11. For this reason, it becomes easy to form the movable seal portion, and it is possible to achieve both smooth relative rotation and firm sealing performance between the cover member 11 and the rotor shaft 8.

Further, since the sleeve member 10 is formed of a nonmagnetic material, the rotor 9 can generate sufficient rotational torque without affecting the magnetic flux extending between the stator 6 and the rotor 9. .
In addition, a pair of O-rings 12 are provided between the inner peripheral surface 10a of the sleeve member 10 and the outer peripheral end 11c of the cover member 11, and are arranged at positions corresponding to the stator end plate 6b in the rotation axis direction. ing. Thereby, the cover member 11 sealed with respect to the sleeve member 10 by the O-ring 12 does not extend to a position where the stator core 6a and the rotor core 9a face each other in the rotation axis direction. Accordingly, since the cover member 11 does not block the magnetic flux between the stator 6 and the rotor 9, the cover member 11 can be formed of either a magnetic material or a non-magnetic material, and the material can be freely selected. The degree increases.

  The stator core 6a and the stator end plate 6b are formed with a plurality of core slots 6a2 and end plate slots 6b1 on the circumference so as to penetrate the stator 6 in the rotation axis direction. The stator 6 includes a stator coil 6c wound around each of the core slot 6a2 and the end plate slot 6b1. Thus, even if the sleeve member 10 is in contact with the inner peripheral surface 6d of the stator 6, the cooling oil supplied into the housing 2 rotates on the stator 6 via the core slot 6a2 and the end plate slot 6b1. Can move in the direction. Therefore, the wound stator coil 6c can be sufficiently cooled by the cooling oil moving in the rotation axis direction.

<Configuration of Embodiment 2>
Based on FIG. 6, an electric motor 1 </ b> A (corresponding to a rotating electrical machine) according to the second embodiment will be described focusing on differences from the electric motor 1 according to the first embodiment. As in FIG. 1, the upper side in FIG. 6 corresponds to the upper side of the electric motor 1A, and the lower side in FIG. 6 corresponds to the lower side of the electric motor 1A. In the housing 2, a vacuum pump 17 (corresponding to air suction means) is connected to the rotor space DSP. The vacuum pump 17 sucks air in the rotor space DSP (corresponding to air in the rotor space). The vacuum pump 17 discharges the air in the rotor space DSP to the outside of the electric motor 1A, and sets the pressure in the rotor space DSP to a predetermined value based on a detection value by a pressure sensor (not shown).

  A pump controller 18 (corresponding to suction control means) is connected to the vacuum pump 17. The pump controller 18 controls the operation of the vacuum pump 17. The electric motor 1 </ b> A is provided with a rotation speed sensor 19 that detects the rotation speed of the rotor 9. The rotation speed sensor 19 is formed by an encoder or a resolver. The pump controller 18 operates the vacuum pump 17 when the rotational speed of the rotor 9 detected by the rotational speed sensor 19 is equal to or higher than a predetermined rotational speed threshold value. Since other configurations are the same as those of the electric motor 1 according to the first embodiment, further description thereof is omitted.

<Effects of Second Embodiment>
The electric motor 1 </ b> A according to this embodiment includes a vacuum pump 17 that sucks air in the rotor space DSP and a pump controller 18 that controls the operation of the vacuum pump 17 in the housing 2. Thereby, since the air in the rotor space DSP is reduced by the operation of the vacuum pump 17, in addition to the reduction of the drag loss by preventing the cooling oil from entering between the stator 6 and the rotor 9, Loss (loss due to air resistance) can be reduced. Therefore, the mechanical output torque loss of the rotor 9 is slight due to the movable seal portion between the cover member 11 and the rotor shaft 8 and the bearing 7. Further, due to the reduction of the air in the rotor space DSP, the wind noise of the rotor 9 is also reduced, and the electric motor 1A with less noise can be obtained. About the mechanical loss resulting from the bearing 7 demonstrated so far, the dragging loss, and the windage loss of the rotor 9, when the rotor 9 exists in a high rotation speed area, the reduction effect is remarkable.
The pump controller 18 operates the vacuum pump 17 when the rotational speed of the rotor 9 detected by the rotational speed sensor 19 is equal to or higher than a predetermined rotational speed threshold. Thereby, the vacuum pump 17 can be operated only at the time of high rotation of the rotor 9 where the influence of the windage loss increases, and the windage loss of the rotor 9 can be efficiently reduced.

<Other embodiments>
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
As long as it can be attached to the electric motor 1, one or both of the cover members 11 may be formed integrally with the sleeve member 10. On the contrary, the sleeve member 10 and the cover member 11 may be divided in any way as long as the rotor space DSP can be isolated in the housing 2.
Further, the shaft hole 11 b of the cover member 11 may be fixed to the rotor shaft 8, or the inner peripheral end of the cover member 11 may be fixed to the rotor end plate 9 b so that the cover member 11 rotates together with the rotor 9. . In this case, the outer peripheral end 11 c of the cover member 11 may be sealed so as to be rotatable relative to the inner peripheral surface 10 a of the sleeve member 10, or the sleeve member 10 may be rotated relative to the inner peripheral surface 6 a of the stator 6. It may be formed as possible.
The present invention is also applicable to a generator that generates electric power in the stator 6 when the rotor 9 is rotated.
The present invention can also be applied to a motor generator having both functions of a generator and a motor.

  In the drawings, 1, 1A is an electric motor (rotary electric machine), 2 is a housing, 2a is an inner peripheral surface of the housing, 5a is a supply oil passage (supply passage), 5b is an oil hole (supply passage), 6 is a stator, 6a Is a stator core, 6a1 is an electromagnetic steel plate (laminated steel plate), 6a2 is a core slot (slot), 6b is a stator end plate (end plate), 6b1 is an end plate slot (slot), 6c is a stator coil, and 6d is a stator coil. A peripheral surface, 8 is a rotor shaft (shaft), 8a is an outer peripheral surface of the rotor shaft (outer peripheral surface of the shaft), 9 is a rotor, 9b is a rotor end plate (end portion in the rotation axis direction of the rotor), and 10 is a sleeve member (sleeve) Part), 10a is an inner peripheral surface of the sleeve member (inner peripheral surface of the sleeve part), 11 is a cover member (cover part), 11b is a shaft hole (inner peripheral end), 1 c is an outer peripheral end, 12 is an O-ring (seal member), 17 is a vacuum pump (air suction means), 18 is a pump controller (suction control means), 19 is a rotation speed sensor, DSP is a rotor space, φ is a rotation shaft Show.

Claims (7)

A housing (2);
A stator (6) fixed to the inner peripheral surface (2a) of the housing;
A shaft (8) attached to the housing so as to be rotatable about a rotation axis (φ);
A rotor (9) fixed to the shaft so as to face radially inward with respect to the stator;
A rotating electrical machine (1, 1A) comprising:
A sleeve portion (10) extending in the rotation axis direction in a state of facing the inner peripheral surface (6d) of the stator;
The rotor is disposed so as to sandwich the rotor in the rotational axis direction, and each outer peripheral end (11c) is sealed between the sleeve portion, and at each inner peripheral end (11b), the outer periphery of the shaft A pair of cover portions (11) for isolating the rotor in the housing together with the sleeve portion by being sealed between the surface (8a) or the rotational axis direction end portion (9b) of the rotor;
Supply paths (5a, 5b) that are formed in the housing and communicate with parts other than the rotor space (DSP) separated by the sleeve part and the cover part in the housing, and for introducing coolant from the outside. ,
Rotating electric machine with Each of the cover portions
2. The outer peripheral end is fixed to the sleeve portion, and is rotatable relative to the outer peripheral surface of the shaft or an end portion in the rotation axis direction of the rotor at each inner peripheral end. Rotating electric machine.   The rotating electrical machine according to claim 1, wherein the sleeve portion is formed of a nonmagnetic material. The stator is
A stator core (6a) formed of a plurality of laminated steel plates (6a1);
A pair of end plates (6b) disposed at both ends of the stator core in the rotation axis direction;
Contains
A pair of seal members that are interposed between the outer peripheral end of each cover portion and the inner peripheral surface (10a) of the sleeve portion, and are arranged at positions corresponding to the end plates in the rotation axis direction. The rotating electrical machine according to any one of claims 1 to 3, further comprising (12). In the stator core and the end plate, a plurality of slots (6a2, 6b1) are formed on the circumference so as to penetrate the stator in the rotation axis direction,
The stator is
The rotating electrical machine according to claim 4, comprising a stator coil (6c) wound around each slot. Air suction means (17) for sucking air in the rotor space;
Suction control means (18) for controlling the operation of the air suction means;
The rotating electrical machine (1A) according to any one of claims 1 to 5, further comprising: A rotation speed sensor (19) for detecting the rotation speed of the rotor;
The suction control means includes
The rotating electrical machine according to claim 6, wherein the air suction unit is operated when a rotation speed of the rotor detected by the rotation speed sensor is equal to or higher than a predetermined rotation speed threshold.

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