JP2005348589A - Cooling structure of axial gap electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure of axial gap electric motor, capable of achieving a higher cooling performance compared with air-cooled type, while serving as an electric motor for a large capacity and vehicle-mounted application. <P>SOLUTION: In an axial gap electric motor, in which a stator 3 and a disc rotor 2 are arranged opposed to each other along a rotating axis 1, among the outer and inner circumferences of the stator 3, a stator cooling structure adapted to cool the stator 3 is provided, by spraying liquid refrigerant with electrical insulating properties from at least either one. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is called a permanent magnet synchronous motor (PMSM) having a permanent magnet in a rotor, and is a technology for a cooling structure of an axial gap motor in which a stator and a disk rotor are arranged to face each other along a rotation axis. Belonging to the field.

  In addition to magnet torque, there are permanent magnet synchronous motors (IPMSM: Interior Permanent Magnet Synchronus Motor) with permanent magnets embedded in the rotor and surface permanent magnet synchronous motors (SPMSM: Surface Permanent Magnet Synchronus Motor) with permanent magnets attached to the rotor surface. In addition, since reluctance torque can also be used, the application range has been expanded to applications such as motors for electric vehicles and hybrid vehicles as motors with high efficiency and a wide variable speed range.

There is known an axial gap motor that is such a permanent magnet synchronous motor, in which a stator and a disk rotor are arranged to face each other along a rotation axis, and an air gap between the stator and the disk rotor is arranged in an axial direction. (For example, see Patent Documents 1, 2, and 3).
JP 11-69697 A JP 2000-253635 A JP 2003-219600 A

  However, since the conventional axial gap motor is mainly for a small capacity motor and does not have a structure for cooling the stator, for example, a large capacity motor for in-vehicle use such as an electric car or a hybrid car. In such a case, there is a problem that the coil heat generation causes a decrease in efficiency and a decrease in durability reliability.

  The present invention has been made paying attention to the above problems, and an object thereof is to provide a cooling structure for an axial gap motor that can achieve high cooling performance compared to air cooling while using a large-capacity on-vehicle motor. And

To achieve the above object, in the present invention, in the axial gap motor in which the stator and the disk rotor are arranged to face each other along the rotation axis,
A stator cooling structure for cooling the stator is provided by spraying an electrically insulating liquid refrigerant from at least one of the outer periphery and the inner periphery of the stator.

  Therefore, in the cooling structure for the axial gap motor of the present invention, the stator is cooled by spraying the electrically insulating liquid refrigerant from at least one of the outer periphery and the inner periphery of the stator. For example, when the stator cooling structure is an air-cooled cooling structure for small-capacity motors, outside air is drawn into the motor, so cooling capacity, reliability, space, etc.・ Cannot be applied in terms of noise. In contrast, since the present invention is a forced liquid cooling method in which an electrically insulating liquid refrigerant is sprayed, a high cooling performance can be achieved as compared with air cooling while using a large-capacity on-vehicle motor.

  Hereinafter, the best mode for carrying out the cooling structure of the axial gap motor of the present invention will be described based on Examples 1 to 3 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall cross-sectional view showing an axial gap motor to which the cooling structure of the first embodiment is applied, and includes a rotating shaft 1, a disk rotor 2, and a stator 3.

  The rotary shaft 1 is rotatably supported by a first bearing 5 provided on the front case 4 and a second bearing 7 provided on the rear case 6. A first seal 9 is interposed between a front side end of the rotating shaft 1 and a seal receiver 8 integrally fixed to the front case 4, and a rear side end of the rotating shaft 1, a motor cover 14, and the like. A second seal 10 is interposed between the two. The rotary shaft 1 is formed with an axial lubricating oil passage 11, a first radial lubricating oil passage 12, and a second radial lubricating oil passage 13, which are formed on a motor cover 14 fixed to the rear case 6. Lubricating oil is supplied from the lubricating oil supply port 15 to cool the bearings 5 and 7.

  The disc rotor 2 is fixed to the second bearing 7 side of the rotary shaft 1 and rotates with the rotary shaft 1. The disk rotor 2 includes a rotor base 16 fixed to the rotary shaft 1 and a plurality of permanent magnets 17 embedded in a surface facing the stator 3.

  The stator 3 is fixed to the front case 4 and opposed to the disk rotor 2 via an air gap 18 in the axial direction. That is, the stator 3 and the disk rotor 2 are arranged to face each other along the rotation shaft 1. The outer peripheral surface of the stator 3 is opposed to the front case 4 and the inner peripheral surface of the stator 3 is opposed to the rotating shaft 1, both of which are not electromagnetically coupled, so that no friction is generated between them. Is arranged.

  FIG. 2 is a front view showing the stator 3 employing the cooling structure of the first embodiment, and FIG. 3 is a cross-sectional view showing the stator 3 employing the cooling structure of the first embodiment.

  The stator 3 is fixed to twelve stator cores 20 which are formed in a trapezoidal shape and project in the axial direction while arranging slots 19 which are boundary grooves with respect to the donut-shaped core base, and fixed to the core base side rear surface of the stator core 20. And a coil 22 wound around each stator core 19 by a concentrated winding method. The stator support base 21 is fixed to the front case 4 in a liquid-tight state.

  As shown in FIG. 2, the stator 3 is configured such that when the rotating shaft 1 is disposed horizontally, the slot 19 that is a boundary groove between adjacent stator cores 20 is not disposed in the horizontal plane including the rotating shaft 1.

  As shown in FIG. 3, the stator cooling structure of Embodiment 1 communicates with the inner peripheral refrigerant supply port 23 and the outer refrigerant supply port 24 formed in the front case 4, and the refrigerant supply ports 23 and 24. From the inner peripheral refrigerant supply path 25 (refrigerant supply path) and the outer peripheral refrigerant supply path 26 (refrigerant supply path) formed in the circumferential direction at the inner peripheral position and the outer peripheral position of the stator support base 21, and the refrigerant supply paths 25, 26. Twelve inner peripheral refrigerant introduction paths 27 (refrigerant introduction paths) and outer peripheral refrigerant introduction paths 28 (refrigerant introduction paths) that branch off and protrude in the axial direction, and whose refrigerant ports (not shown) are opened toward the stator cores 20; Have As shown in FIG. 2, an electric insulating liquid refrigerant is sprayed from the inner and outer periphery to each stator core 20 by a pair of refrigerant introduction paths 27 and 28.

  In the first embodiment, the refrigerant supply paths 25 and 26 for supplying the refrigerant to the refrigerant introduction paths 27 and 28 are formed on a surface perpendicular to the rotating shaft 1 of the front case 4 to which the stator 3 is fixed. ing.

Next, the operation will be described.
[Solutions]
A permanent magnet synchronous motor in which an axial gap motor in which an stator and a disk rotor are arranged to face each other along a rotation axis and an air gap between the stator and the disk rotor is arranged in an axial direction is used, for example, an electric vehicle or a hybrid When a large-capacity electric motor is used for a vehicle or the like, continuous operation with a high load is required. Therefore, in order to maintain the required performance, it is necessary to effectively cool the stator that generates heat.

  On the other hand, as a technique for cooling an optical disk apparatus using a motor as a drive source, for example, techniques described in Japanese Patent Application Laid-Open Nos. 2003-151259 and 11-126472 are known.

  The cooling technique described in the former publication is such that a cooling fan that has been driven by a separate motor is provided so as to be freely coupled to the disk rotor, and is coupled when necessary to cool the inside of the apparatus. This cooling technology aims to achieve both a dustproof effect by devising the position of the opening for sucking and exhausting cooling air into the device cover.

  However, all of the optical disk device cooling technologies are air-cooled cooling structures for small-capacity motors, and the outside air is sucked into the device. It cannot be applied from the viewpoint of characteristics, space, noise, etc.

[Stator cooling]
On the other hand, in Example 1, in the axial gap motor in which the stator 3 and the disk rotor 2 are arranged to face each other along the rotation axis, by spraying an electrically insulating liquid refrigerant from the inner and outer circumferences of each stator core 20, By providing a stator cooling structure using a forced liquid cooling method for cooling the stator 3, a high cooling performance can be achieved as compared with air cooling while using a large-capacity on-vehicle motor.

  That is, the electrically insulating liquid refrigerant supplied from the outside by a pump or the like passes through an inner peripheral refrigerant supply port 23 formed in the front case 4 and an inner peripheral refrigerant supply path 25 formed in the stator support base 21. As shown in FIG. 2, the air is supplied to the individual inner peripheral refrigerant introduction passages 27 and sprayed from the inner periphery toward the respective stator cores 20 from the refrigerant openings opened in the inner peripheral refrigerant introduction passages 27. Further, the refrigerant is supplied to twelve outer peripheral refrigerant introduction paths 28 via the outer peripheral refrigerant supply port 24 formed in the front case 4 and the outer peripheral refrigerant supply path 26 formed in the stator support base 21, as shown in FIG. It is sprayed from the outer periphery toward each stator core 20 from the refrigerant port opened in the outer peripheral refrigerant introduction path 28.

  As described above, in the axial gap motor in which the stator 3 and the disk rotor 2 are arranged to face each other along the rotation shaft 1, the stator core 20 is sprayed with an electrically insulating liquid refrigerant from the inner and outer peripheries. Therefore, it is possible to obtain a higher cooling performance than air cooling. In addition, by blowing an electrically insulating liquid refrigerant from the inner and outer circumferences of each stator core 20, it is possible to prevent a part of the stator cores 20 from being insufficiently cooled, and the cooling performance for each stator core 20 is uniform. Secured.

  In addition, as shown in FIG. 2, when the rotary shaft 1 is arranged horizontally, the slots 19 that are the boundaries of the adjacent stator cores 20, 20 are not arranged in the horizontal plane including the rotary shaft 1. Has an inclination angle with respect to the horizontal plane, and when the electrically insulating liquid refrigerant sprayed on each stator core 20 enters the slot 19, it flows by the action of gravity, so that high cooling performance can be obtained.

Next, the effect will be described.
In the cooling structure for the axial gap motor of the first embodiment, the effects listed below can be obtained.

  (1) In an axial gap motor in which the stator 3 and the disk rotor 2 are arranged to face each other along the rotation shaft 1, an electrically insulating liquid refrigerant is sprayed from at least one of the outer periphery and the inner periphery of the stator 3. Therefore, since the stator cooling structure for cooling the stator 3 is provided, a high cooling performance can be achieved as compared with the air cooling while using a large-capacity on-vehicle motor.

  (2) In the stator 3, when the coil 22 is wound in concentrated winding and the rotary shaft 1 is placed horizontally, a slot 19 that is a boundary groove between adjacent stator cores 20 is placed in a horizontal plane including the rotary shaft 1. Therefore, when the electrically insulating liquid refrigerant sprayed on the stator core 20 enters the slot 19, it flows by the action of gravity and high cooling performance can be obtained.

  (3) The stator cooling structure includes refrigerant supply passages 25 and 26 formed in an inner circumferential position and an outer peripheral position of the stator 3 in the circumferential direction, and branches from the refrigerant supply passages 25 and 26 and protrudes in the axial direction. Each of the stator cores 20 is cooled by an electrically insulating liquid refrigerant sprayed from the inner and outer circumferences of the stator cores 20. It is possible to prevent the shortage and to ensure the uniformity of the cooling performance with respect to each stator core 20.

  The second embodiment is an example in which the cost is reduced without sacrificing the cooling performance of the first embodiment.

  That is, as shown in FIG. 4, in the case of the concentrated winding stator as shown in the second embodiment, the slots 19 of the adjacent stator cores 20 are arranged so as not to coincide with each other in the horizontal plane including the rotating shaft 1. The stator cooling structure includes refrigerant supply passages 25 and 26 formed in the circumferential direction at the inner peripheral position and the outer peripheral position of the stator 3, branches from the refrigerant supply passages 25 and 26, and protrudes in the axial direction. Refrigerant inlet passages 27 and 28 whose refrigerant ports are open toward the outer peripheral refrigerant inlet passages 28-1, 28-2, 28-2, 28-2, 28-3, 28-4, 28-5, 28-6, the inner peripheral refrigerant introduction paths 27-1, 27-2, 27-3, 27-4, 27-5, 27-6, each is sprayed with an electrically insulating liquid refrigerant. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Describing the stator cooling action, when the electrically insulating liquid refrigerant sprayed on the stator core 20 enters the slot 19, it flows by the action of gravity, so that the cooling performance does not deteriorate. Since the liquid refrigerant flows through the slot 19 as described above, the upper half of the stator core 20 has only six outer peripheral refrigerant introduction paths 28-1, 28-2, 28-3, 28-4 on the outer peripheral side. 28-5, 28-6, and the lower half has only six inner peripheral refrigerant introduction paths 27-1, 27-2, 27-3, 27-4, 27-5, 27- on the inner peripheral side only. The cooling performance of Example 2 in which the number of the refrigerant introduction paths 27 and 28 is 12 and Example 1 in which the number of the refrigerant introduction paths 27 and 28 is 24, which is twice, even if 6 is arranged. Even when compared, the same cooling performance can be obtained.

  Incidentally, the cooling of the upper half stator cores 20-2 to 20-6 is shared by the peripheral refrigerant introduction paths 28-1, 28-2, 28-3, 28-4, 28-5, 28-6. In other words, the cooling of the stator core 20-2 is shared by the refrigerant introduction paths 28-1 and 28-2, and the cooling of the stator core 20-3 is shared by the refrigerant introduction paths 28-2 and 28-3, and the stator core 20-4. The cooling of the stator core 20-5 is shared by the refrigerant introduction paths 28-3 and 28-4, and the cooling of the stator core 20-5 is shared by the refrigerant introduction paths 28-4 and 28-5. Roads 28-5 and 28-6 are assigned.

  The cooling of the lower half stator cores 20-8 to 20-12 is shared by the inner peripheral refrigerant introduction paths 27-1, 27-2, 27-3, 27-4, 27-5, 27-6. That is, the cooling of the stator core 20-8 is shared by the refrigerant introduction paths 27-5 and 27-6, and the cooling of the stator core 20-9 is shared by the refrigerant introduction paths 27-4 and 27-5, and the stator core 20-10. The cooling of the stator core 20-11 is shared by the refrigerant introduction paths 27-3 and 27-4, and the cooling of the stator core 20-11 is shared by the refrigerant introduction paths 27-2 and 27-3. Roads 27-1 and 27-2 share.

  Further, cooling of the stator core 20-1 and the stator core 20-7 existing on the horizontal plane is shared by the outer peripheral refrigerant introduction paths 28-1, 28-6 and the inner peripheral refrigerant introduction paths 27-1, 27-6. That is, the cooling of the stator core 20-1 is shared by the refrigerant introduction paths 27-1 and 28-1, and the cooling of the stator core 20-7 is shared by the refrigerant introduction paths 27-6 and 28-6.

Next, the effect will be described.
In the cooling structure of the axial gap motor of the second embodiment, the following effects can be obtained in addition to the effects (1) and (2) of the first embodiment.

  (4) The stator cooling structure includes refrigerant supply paths 25 and 26 formed in the circumferential direction at inner and outer peripheral positions of the stator core 20, and branches from the refrigerant supply paths 25 and 26 and protrudes in the axial direction. Refrigerant introduction passages 27 and 28 each having a refrigerant opening opened toward each stator core 20. The upper half stator core 20 is electrically insulated from the outer periphery, and the lower half stator core 20 is electrically insulated from the inner periphery. Therefore, the number of the refrigerant introduction paths 17 and 18 can be reduced and the structure can be simplified and the cost can be reduced without sacrificing the cooling performance.

  The third embodiment is an example in which the cost is further reduced with respect to the first and second embodiments without sacrificing the cooling performance.

  That is, as shown in FIG. 5, the stator cooling structure of the third embodiment protrudes in the axial direction at the inner peripheral position and the outer peripheral position of the stator 3, and the stator cooling structure 2 The inner peripheral refrigerant introduction passage 27 and the seven outer peripheral refrigerant introduction passages 28 in the upper half position, and the refrigerant guide member for guiding the electrically insulating liquid refrigerant from the refrigerant inlets of the refrigerant introduction passages 27 and 28 to each stator core 20 And having.

  The refrigerant guide member is constituted by a plurality of inner peripheral side refrigerant guide members 29 arranged at the inner peripheral position of the stator 3, and an outer peripheral side refrigerant guide member 30 arranged at the outer peripheral position of the stator 3, and The plurality of inner circumferential refrigerant guide members 29 are arranged without crossing each other in the radial direction.

  The inner peripheral side refrigerant guide member 29 is concentrically formed on the outer side with the first inner peripheral side refrigerant guide member 29a surrounding the entire inner periphery of the stator 3 and the first inner peripheral side refrigerant guide member 29a being the innermost position. And a second inner circumferential side refrigerant guiding member 29c and a third inner circumferential side refrigerant guiding member 29c which are arranged so as to form a passage connecting the stator core 20 and the slot 19 which are positioned substantially on the horizontal plane. Composed. Note that bent portions extending in the radial direction to the positions in contact with the coil 22 are formed at both ends of the second inner circumferential side refrigerant guiding member 29b and the third inner circumferential side refrigerant guiding member 29c.

  The outer peripheral side refrigerant guide member 30 is disposed so as to surround the entire outer periphery of the stator 3, and partition portions 30 a extending in the radial direction to the position in contact with the coil 22 are formed at six positions in the upper half. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  The stator cooling operation will be described. In the third embodiment, the two inner peripheral refrigerant introduction paths 27 at the upper and lower positions, the seven outer peripheral refrigerant introduction paths 28 at the upper half position, the first inner peripheral refrigerant induction member 29a, and the first 2 By the combination of the inner peripheral side refrigerant guide member 29 formed by the inner peripheral side refrigerant guide member 29b and the third inner peripheral side refrigerant guide member 29c, and the outer peripheral side refrigerant guide member 30 in which the partition portion 30a is formed, As shown by the arrows in FIG. 5, the electric insulating liquid refrigerant is caused to flow in all the slots 19 between the adjacent stator cores 20, 20, and the refrigerant introduction paths 27, 28 are provided in the first embodiment (24) or the second embodiment. The cooling performance equivalent to that of Examples 1 and 2 is ensured while the number is smaller than (12).

Incidentally, when the two inner peripheral refrigerant introduction paths 27 are 27-1 and 27-2 and the seven outer peripheral refrigerant introduction paths 28 are 28-1 to 28-7, the slots 19-1 to 19-12 are provided. The liquid refrigerant flows to the side as follows.
To the slots 19-1 and 19-2, the liquid refrigerant from the outer periphery refrigerant introduction path 28-4 flows from the outside, and to the slot 19-3, the liquid refrigerant from the outer periphery refrigerant introduction path 28-5 flows from the outside, The liquid refrigerant from the outer periphery refrigerant introduction path 28-6 flows from the outside into the slot 19-4, and the liquid refrigerant from the outer periphery refrigerant introduction path 28-6 flows into the third inner periphery side refrigerant guide member into the slot 19-5. It flows from the inside through a passage formed between the coil 29c and the coil 22, and into the slot 19-6, the liquid refrigerant from the outer periphery refrigerant introduction path 28-5 and the second inner periphery side refrigerant guide member 29b and the third It flows from the inside through a passage formed between the inner circumferential refrigerant guide member 29c.
The liquid refrigerant from the inner refrigerant introduction path 27-2 flows into the slots 19-7 and 19-8 from the inner side, and the liquid refrigerant from the outer refrigerant introduction path 28-4 and the inner refrigerant introduction path 27-1 is first. They merge through a passage formed between the inner peripheral refrigerant guide member 29a and the second inner peripheral refrigerant guide member 29b.
To the slot 19-9, the liquid refrigerant from the outer periphery refrigerant introduction path 28-3 passes through the passage formed between the second inner peripheral side refrigerant guide member 29b and the third inner peripheral side refrigerant guide member 29c. The liquid refrigerant from the outer peripheral refrigerant introduction path 28-2 flows from the inside through the passage formed between the third inner peripheral side refrigerant guiding member 29c and the coil 22 into the slot 19-10. The liquid refrigerant from the outer periphery refrigerant introduction path 28-2 flows from the outside to 19-11, and the liquid refrigerant from the outer periphery refrigerant introduction path 28-3 flows from the outside to the slot 19-12.

Next, the effect will be described.
In the cooling structure of the axial gap motor of the third embodiment, the effects listed below can be obtained in addition to the effects (1) and (2) of the first embodiment.

  (5) The stator cooling structure protrudes in the axial direction at the inner peripheral position and the outer peripheral position of the stator 3, and has two inner peripheral refrigerant introduction paths 27 and an upper half at the upper and lower positions where the refrigerant ports are opened toward the stator core 20. Since there are seven outer peripheral refrigerant introduction paths 28 at positions, and a refrigerant guide member that guides the electrically insulating liquid refrigerant from the refrigerant inlets of the refrigerant introduction paths 27 and 28 to each stator core 20, further than in the second embodiment. The number of refrigerant introduction paths can be reduced, the structure is simplified, and the cost can be further reduced.

  (6) The refrigerant guide member includes a plurality of inner peripheral side refrigerant guide members 29 arranged at the inner peripheral position of the stator 3 and an outer peripheral side refrigerant guide member 30 arranged at the outer peripheral position of the stator 3. In addition, since the plurality of inner circumferential refrigerant guide members 29 are arranged without intersecting each other in the radial direction, the number of refrigerant introduction paths is reduced while ensuring a smooth circumferential flow of the liquid refrigerant. Thus, the flow of the liquid refrigerant can be defined.

  (7) The inner circumference side refrigerant guide member 29 is a passage that connects the first inner circumference side refrigerant guide member 29a that surrounds the entire inner circumference of the stator 3, and the stator core 20 and the slot 19 that are positioned substantially in plane with respect to the horizontal plane. The second inner circumferential side refrigerant guiding member 29b and the third inner circumferential side refrigerant guiding member 29c are arranged so as to form the outer circumferential side refrigerant guiding member 29c, and the outer circumferential side refrigerant guiding member 30 is disposed so as to surround the entire outer circumference of the stator 3. Therefore, the liquid refrigerant defined symmetrically in the annular region surrounded by the first inner circumferential side refrigerant guiding member 29a and the outer circumferential side refrigerant guiding member 30 while minimizing the number of refrigerant introduction paths. High cooling performance can be achieved by the flow.

  As mentioned above, although the cooling structure of the axial gap motor of the present invention has been described based on the first to third embodiments, the specific configuration is not limited to these embodiments, and each of the claims Design changes and additions are permitted without departing from the scope of the claimed invention.

  In the first embodiment, the refrigerant introduction passages for supplying the refrigerant to the inner and outer circumferences of the stator and the refrigerant introduction passage are formed on a surface perpendicular to the rotation axis of the case fixing the stator. For example, the refrigerant introduction path on the outer periphery of the stator can be formed on the side surface parallel to the rotation axis of the case.

  In the first embodiment, in order to prevent the liquid refrigerant from being applied to the rotating shaft, a baffle plate that covers at least the upper surface of the rotating shaft may be provided.

  In the stator cooling structure of the third embodiment, the inner peripheral refrigerant introduction path and the outer peripheral refrigerant introduction path are used, and this is combined with the inner peripheral refrigerant induction member and the outer peripheral refrigerant induction member. This can be combined with the inner peripheral refrigerant guide member and the outer peripheral refrigerant guide member.

  In the first, second, and third embodiments, the application example to the axial gap motor including the stator by the concentrated winding method is shown, but the present invention can also be applied to the axial gap motor including the stator by the distributed winding method.

1 is an overall cross-sectional view showing an axial gap motor to which a cooling structure of Example 1 is applied. It is a front view which shows the stator to which the cooling structure of the axial gap electric motor of Example 1 was applied. It is sectional drawing which shows the stator to which the cooling structure of the axial gap electric motor of Example 1 was applied. It is a front view which shows the stator to which the cooling structure of the axial gap electric motor of Example 2 was applied. It is a front view which shows the stator to which the cooling structure of the axial gap electric motor of Example 3 was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Disc rotor 3 Stator 4 Front case 5 First bearing 6 Rear case 7 Second bearing 8 Seal receiver 9 First seal 10 Second seal 11 Axial lubricating oil path 12 First radial lubricating oil path 13 Second diameter Directional lubricating oil path 14 Motor cover 15 Lubricating oil supply port 16 Rotor base 17 Permanent magnet 18 Air gap 19 Slot 20 Stator core 21 Stator support base 22 Coil 23 Inner peripheral refrigerant supply port 24 Outer refrigerant supply port 25 Inner peripheral refrigerant supply path (refrigerant Supply channel)
26 Peripheral refrigerant supply path (refrigerant supply path)
27 Inner peripheral refrigerant introduction path (refrigerant introduction path)
28 Peripheral refrigerant introduction path (refrigerant introduction path)
29 Inner peripheral side refrigerant guide member (refrigerant guide member)
30 Outer peripheral side refrigerant guide member (refrigerant guide member)

Claims (7)

In the axial gap motor in which the stator and the disk rotor are arranged to face each other along the rotation axis,
A cooling structure for an axial gap motor, wherein a stator cooling structure for cooling the stator is provided by spraying an electrically insulating liquid refrigerant from at least one of the outer periphery and the inner periphery of the stator. In the cooling structure of the axial gap electric motor according to claim 1,
The stator is configured such that when the coil is wound in concentrated winding and the rotation shaft is disposed horizontally, slots that are boundary grooves of adjacent stator cores are not disposed in a horizontal plane including the rotation shaft. Axial gap motor cooling structure. In the cooling structure of the axial gap electric motor according to claim 1 or 2,
The stator cooling structure includes a refrigerant supply path formed in the circumferential direction at an inner peripheral position and an outer peripheral position of the stator, a branch from the refrigerant supply path and protruding in an axial direction, and a refrigerant port is opened toward each stator core. A cooling structure for an axial gap motor, wherein an electric insulating liquid refrigerant is sprayed from the inner and outer circumferences to each stator core. In the cooling structure of the axial gap electric motor according to claim 1 or 2,
The stator cooling structure includes a refrigerant supply path formed in the circumferential direction at an inner peripheral position and an outer peripheral position of the stator, a branch from the refrigerant supply path and protruding in an axial direction, and a refrigerant port is opened toward each stator core. Cooling the axial gap motor, characterized in that an electrically insulating liquid refrigerant is sprayed from the outer periphery to each of the upper half stator cores and from the inner periphery to each of the lower half stator cores. Construction. In the cooling structure of the axial gap electric motor according to claim 1 or 2,
The stator cooling structure includes a refrigerant introduction path protruding in an axial direction at least at an outer peripheral position of the stator and having a refrigerant port opened toward the stator core, and an electrically insulating liquid refrigerant from the refrigerant port of the refrigerant introduction path. A cooling structure for an axial gap motor, comprising: a refrigerant guide member that leads to each stator core. In the cooling structure of the axial gap electric motor according to claim 5,
The refrigerant guide member is constituted by a plurality of inner peripheral side refrigerant guide members arranged at an inner peripheral position of the stator, and an outer peripheral side refrigerant guide member arranged at an outer peripheral position of the stator, and The cooling structure for an axial gipp electric motor, wherein the circumferential refrigerant guide members are arranged without crossing each other in the radial direction. In the cooling structure of the axial gap electric motor according to claim 6,
The inner circumference side refrigerant guide member is arranged so as to surround the entire inner circumference of the stator, and is arranged so as to connect a stator core and a slot positioned substantially in plane with respect to a horizontal plane, and the outer circumference side refrigerant guide member is A cooling structure for an axial gap motor, wherein the cooling structure is arranged so as to surround the entire outer periphery of the stator.

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