JP2010172132A - Rotating electric machine and method for cooling the rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more suppress a rise in temperature of a rotor of a rotating electric machine than in a conventional method. <P>SOLUTION: A cooling medium 31 is flown from holes 15a-15d formed on a rotating shaft 15 to an inner circumferential surface of a rotor holding member 16 having "an outer circumferential surface abutting to the whole inner surface of (a core) of a rotor 12" and "the inner circumferential surface having an abutting region abutting to the outer circumferential surface of a rotating shaft 15 and a non-abutting region with a gap from the outer circumferential surface of the rotating shaft 15". Accordingly, the rotor holding member 16 exchanges heat with (the core) of the rotor 12 while being cooled by the cooling medium 31. Since the outer circumferential surface of the rotor holding member 16 abuts to the whole inner circumferential surface of (the core) of the rotor 12, heat exchange with the rotor 12 is executed in a wider range than in a conventional method. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine and a method for cooling a rotating electrical machine, and is particularly suitable for use in cooling a rotor of a rotating electrical machine.

In a rotating electrical machine such as a motor having a stator (stator) and a rotor (rotor), the rotor generates heat due to iron loss of the rotor core. The rotor is provided on the axial center side with respect to the stator, and the outer peripheral surface of the rotor is close to the inner peripheral surface of the stator. Therefore, the rotor also receives heat generated by the stator. However, since the solid member suitable for transferring heat from the rotor to the outside of the rotating electrical machine is generally limited to the rotating shaft having a small cross-sectional area, it is difficult to release the heat generated in the rotor to the outside.
When a permanent magnet is used as the magnetic pole of the rotor, the permanent magnet is demagnetized when the temperature of the permanent magnet rises, and the function of the permanent magnet as a magnet may be reduced (that is, There is a possibility that the function as a rotor is lowered).

Therefore, conventionally, there is a technique for cooling the rotor of the rotating electrical machine.
In Patent Documents 1 to 3, an oil passage communicating with an oil passage formed in a hollow portion of a rotating shaft provided in a shaft portion of a rotating electrical machine is formed radially in the iron core of the rotor. Techniques to do this are disclosed.

JP 2001-16826 A JP 2006-67777 A JP 2008-86130 A

  However, in the techniques described in Patent Documents 1 to 3 described above, since it is necessary to ensure the function as the iron core of the rotor, a large number of oil passages or large oil passages are formed inside the iron core. Is difficult. Therefore, since the contact area between the cooling oil and the iron core of the rotor is small, there is a problem that it is difficult to suppress the temperature rise of the rotor.

  The present invention has been made in view of such problems, and an object of the present invention is to make it possible to suppress an increase in the temperature of a rotor of a rotating electrical machine more than in the past.

  The rotating electrical machine according to the present invention includes a yoke extending in the circumferential direction, a tooth extending in the radial direction from the yoke, a stator wound around the teeth, and an outer peripheral surface of the stator. A rotor disposed at a position where the axis and the center of the stator are the same so as to be opposed to the inner peripheral surface of the stator with a gap, and an outer peripheral surface is more than the inner peripheral surface of the rotor A rotation shaft disposed at a position where the axis and the axis of the stator and the rotor are the same so as to be on the axis side, an inner circumferential surface of the rotor, and an outer circumferential surface of the rotation shaft; A rotor holding member disposed between the rotor holding member, the rotor holding member having an outer peripheral surface and an inner peripheral surface extending in a direction of the axis, and the outer peripheral surface of the rotor holding member Is in contact with the inner peripheral surface of the rotor, and the inner peripheral surface of the rotor holding member is A contact region that contacts the peripheral surface, and a non-contact region that is spaced from the outer peripheral surface of the rotating shaft, and a cooling medium is provided in the non-contact region of the inner peripheral surface of the rotor holding member. It is characterized by being supplied.

  A cooling method for a rotating electric machine according to the present invention includes a stator having a yoke extending in a circumferential direction, teeth extending in a radial direction from the yoke, and a coil wound around the teeth, A rotor disposed at a position where the axial center of the stator and the axial center are the same so that the surface faces the inner peripheral surface of the stator with an interval, and an outer peripheral surface of the inner surface of the rotor A rotation shaft disposed at a position where the axis and the axis of the stator and the rotor are the same so as to be closer to the axis side than the circumferential surface; an inner circumferential surface of the rotor; and A rotor holding member disposed between the rotor holding member and the outer peripheral surface, the rotor holding member having an outer peripheral surface and an inner peripheral surface extending in a direction of the axis, and the rotor holding member. An outer peripheral surface of the rotor is in contact with an inner peripheral surface of the rotor, and an inner peripheral surface of the rotor holding member is A cooling method for a rotating electrical machine, comprising: a contact region that contacts the outer peripheral surface of the shaft; and a non-contact region that is spaced from the outer peripheral surface of the rotary shaft, the inner peripheral surface of the rotor holding member A supply step of supplying a cooling medium to the non-contact area.

  According to the present invention, the outer peripheral surface is in contact with the inner peripheral surface of the rotor, the contact region is in contact with the outer peripheral surface of the rotary shaft, and the non-contact region is spaced from the outer peripheral surface of the rotary shaft. The cooling medium is supplied to the inner peripheral surface of the rotor holding member having the inner peripheral surface. Therefore, heat exchange with the rotor can be performed in a wider area than before. Therefore, the temperature rise of the rotor of the rotating electrical machine can be suppressed more than before.

It is a figure which shows the 1st Embodiment of this invention and shows an example of a structure of an IPM motor. It is sectional drawing of the IPM motor which showed the 1st Embodiment of this invention and was seen from the AA 'direction of FIG. It is a figure which shows the 1st Embodiment of this invention and shows an example of the mode of ATF which flows through the non-contact area | region of the internal peripheral surface of a rotor holding member. The 1st Embodiment of this invention is shown, An example of a cooling oil supply member opening the hole of a rotating shaft, and an example of a cooling oil supply member closing the hole of a rotating shaft, FIG. It is a figure which shows the 2nd Embodiment of this invention and shows an example of a structure of an IPM motor. It is a figure which shows the 3rd Embodiment of this invention and shows an example of a structure of an IPM motor.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a configuration of an IPM motor that is an example of a rotating electrical machine. Specifically, FIG. 1 shows an example of a cross-sectional view of the IPM motor when passing along the rotation axis of the IPM motor (the rotation axis of the rotation shaft 15) and cutting along the rotation axis. FIG. 2 is a cross-sectional view of the IPM motor viewed from the AA ′ direction in FIG. In addition, in FIG. 1, the part which codes | symbols other than the code | symbol 16h point is a cross section. In the present embodiment, the case where the IPM motor is used as a vehicle drive motor for an electric vehicle or the like will be described as an example. In each figure, only the outline of the necessary part is shown for convenience of explanation.

  1 and 2, an IPM motor 10 includes a stator (stator) 11, a rotor (rotor) 12 including permanent magnets 13a to 13h, a case 14, a rotating shaft 15, and a rotor holding member 16. And a cooling medium supply member 17 and an end face plate 18.

  The stator 11 has a yoke extending in the circumferential direction and a plurality of teeth extending in the axial direction from the inner peripheral side of the yoke. The plurality of teeth are provided at substantially equal intervals in the circumferential direction (in the example illustrated in FIG. 21, twelve teeth are provided). A coil is wound around the teeth. In the present embodiment, a case where the coil is distributed winding will be described as an example. Therefore, as shown in FIG. 2, the IPM motor 10 has coil ends 19a to 19d. However, the coil is not limited to distributed winding but may be concentrated winding.

The rotor 12 has a thick hollow cylindrical shape, and its outer peripheral surface opposes the tip end surface of the teeth of the rotor 211 with a predetermined interval, and its axis (rotating shaft). Is arranged at the same position as the axis of the stator 11.
Such a rotor 12 includes an iron core configured by stacking, in the thickness direction, a plurality of circular electromagnetic steel plates each having a plurality of holes formed at intervals in the circumferential direction on the outer peripheral side; And a plurality of permanent magnets 13a to 13h embedded (inserted) in the holes formed in. In the present embodiment, among the permanent magnets 13a to 13h, one of the rotors 12 is formed by two permanent magnets (for example, the permanent magnets 13a and 13b) that are relatively adjacent to each other on the rotating shaft side of the rotor 12. Two poles (poles) are formed.

When the case 14 is shrink-fitted or the like, the stator 14 is fixed in close contact with the stator 11 from the periphery (outer periphery) of the stator 11. The case 14 is made of, for example, a magnetic material such as iron or a nonmagnetic material such as aluminum.
The rotation shaft 15 is for rotating the rotor 12, and is more than the inner peripheral surface of the rotor 12 so that the axis (rotation axis) thereof coincides with the axis (rotation axis) of the IPM motor 10. It is arranged on the axial center side. In the following description, the rotation axis and axis of the IPM motor 10 (rotation axis and axis of the rotation shaft 15) are abbreviated as a rotation axis or axis as necessary.

  The rotating shaft 15 has a hollow cylindrical shape, and the hollow portion serves as a cooling medium path through which a cooling medium 31 supplied by a pump (not shown) passes. Further, in the region of the side surface of the rotary shaft 15 where the inner peripheral surface of the rotor holding member 16 described later is not in contact, the region close to the center in the axial direction of the IPM motor 10 is the outer periphery of the rotary shaft 15. Holes 15a to 15d penetrating between the surface and the inner peripheral surface are formed. The cooling medium 31 is preferably used when a lubricating oil such as ATF (Automatic Transmission Fluid) is used for a bearing or a power transmission unit (gear or the like) attached to the IPM motor 10. . The cooling medium 31 is accumulated in the lower part of the IPM motor, and is supplied to the cooling medium path by the above-described pump and circulated. The cooling medium 31 is cooled by the heat exchanger in the circulation path. be able to.

  The rotor holding member 16 is positioned between the outer peripheral surface of the rotary shaft 15 and the inner peripheral surface of the rotor 12 (iron core thereof) so that the axis of the rotor holding member 16 coincides with the axis (rotary axis) of the IPM motor 10. Provided. The rotor holding member 16 has a function of holding the rotor 12 (iron core) and a function of cooling the rotor 12 (iron core). The rotor holding member 16 is preferably made of metal from the viewpoint of mechanical strength and thermal conductivity.

Rotor holding member 16 has an outer peripheral surface and an inner peripheral surface extending in the axial direction of IPM motor 10. In this embodiment, the outer peripheral surface of the rotor holding member 16 is in contact with the entire inner peripheral surface of the rotor 12 (iron core thereof). Further, the inner peripheral surface of the rotor holding member 16 includes a region that is in contact with the outer peripheral surface of the rotary shaft 15 and a region that is spaced from the outer peripheral surface of the rotary shaft 15. In the present embodiment, the inner peripheral surface of the rotor holding member 16 and the outer peripheral surface of the rotary shaft 15 come into contact with each other in the vicinity of the center of the IPM motor 10 in the axial center direction, and other than the inner peripheral surface of the rotor holding member 16. In the region, the inner peripheral surface of the rotor holding member 16 and the outer peripheral surface of the rotary shaft 15 are spaced apart.
In the following description, the region of the inner peripheral surface of the rotor holding member 16 that contacts the outer peripheral surface of the rotary shaft 15 is, as necessary, the contact region of the inner peripheral surface of the rotor holding member 16; Alternatively, it is simply referred to as a contact area. Moreover, the area | region which has a space | interval with the outer peripheral surface of the rotating shaft 15 among the inner peripheral surfaces of the rotor holding member 16 is made into the non-contact area | region of the inner peripheral surface of the rotor holding member 16, as needed. Alternatively, it is simply referred to as a non-contact area.

FIG. 3 is a diagram conceptually illustrating an example of the state of the cooling medium 31 flowing in the non-contact area on the inner peripheral surface of the rotor holding member 16.
As shown in FIG. 3, in the present embodiment, the distance between the non-contact area of the inner peripheral surface of the rotor holding member 16 and the axis of the rotor 12 is determined by the IPM motor 10 (rotor holding member 16). The non-contact area of the inner peripheral surface of the rotor holding member 16 is inclined so as to increase toward the end in the axial direction. In this way, the cooling medium 31 that has flowed out of the holes 15 a to 15 d of the rotary shaft 15 is not contacted with the inner peripheral surface of the rotor holding member 16 due to the centrifugal force acting on the cooling medium 31 by the rotation of the rotor 12. The cooling medium 31 is made to flow easily in the axial direction along the inclination by flowing along the inclination formed in (i.e., from the relatively upper region to the lower region). Can do. In the drawing, the inclination is drawn with a little exaggeration for convenience of explanation, but an inclination angle suitable for the rotational speed of the rotor and the flow rate of the cooling medium can be selected.

  As shown in FIG. 3, in the present embodiment, the non-contact region on the inner peripheral surface of the rotor holding member 16 includes a plurality of convex portions 16 a to 16 j so as to have a predetermined interval in the axial direction. It is formed in the circumferential direction of the rotor holding member 16. The plurality of convex portions 16a to 16j make it possible for the cooling medium 31 to stay in the circumferential direction of the non-contact region as much as possible even when the rotor holding member 16 rotates along with the rotation of the rotor 12. It has a height and a cross-sectional shape that can be suppressed. By doing so, at least a part of the cooling medium 31 that has flowed out of the holes 15 a to 15 d of the rotating shaft 15 is caused to rotate by the rotation of the rotor holding member 16 accompanying the rotation of the rotating shaft 15. Is temporarily stopped, and the inner peripheral surface of the rotor holding member 16 is moved in the circumferential direction. Therefore, the cooling medium 31 that has flowed out of the holes 15 a to 15 d of the rotating shaft 15 can spread and flow easily in the circumferential direction of the inner peripheral surface of the rotor holding member 16.

In the present embodiment, by configuring the rotor holding member 16 as described above, the cooling medium 31 that has flowed out of the holes 15a to 15d of the rotary shaft 15 is transferred to the inner peripheral surface of the rotor holding member 16 as much as possible. It can be made to spread throughout.
As described above, the outer peripheral surface of the rotor holding member 16 is in contact with the inner peripheral surface of the rotor 12, and the rotor 12 (iron core thereof) and the rotor holding member 16 exchange heat. The rotor holding member 16 is cooled by the cooling medium 31. That is, the rotor holding member 16 exchanges heat with the rotor 12 (iron core) while being cooled by the cooling medium 31. Thereby, the temperature of the rotor 12 can be lowered. In this embodiment, since the temperature of the rotor 12 is lowered in this way, it is preferable to form the rotor holding member 16 with a material having a high thermal conductivity such as metal.

The cooling medium supply member 17 is disposed in an oil passage that is a hollow portion of the rotating shaft 15, moves in the axial direction according to the control of the driving device 20, and opens or closes the holes 15 a to 15 d of the rotating shaft 15. It has the function to do.
FIG. 4 shows an example (FIG. 4A) in which the cooling medium supply member 17 opens the holes 15a to 15d of the rotating shaft 15, and the cooling medium supply member 17 has the holes 15a to 15a of the rotating shaft 15. It is a figure which shows an example (FIG.4 (b)) of a mode that 15d is closed.

  In the present embodiment, the cooling medium supply member 17 has a hollow cylindrical shape. The cooling medium supply member 17 is formed with holes 17 a to 17 l that pass through between the outer peripheral surface and the inner peripheral surface of the cooling medium supply member 17. By these holes 17a to 17l, the cooling medium 31 supplied to the cooling medium path in the rotating shaft 15 can go back and forth inside and outside the cooling medium supply member 17 (that is, the entire cooling medium path in the rotating shaft 15). And the cooling medium 31 can be spread over.

  Further, a plurality of convex portions 17 m to 17 p are formed on the outer peripheral surface of the cooling medium supply member 17. The plurality of convex portions 17m to 17p are formed at positions where the relative positional relationship with the holes 15a to 15d of the rotary shaft 15 is the same. Furthermore, the area of the surface in the circumferential direction of the plurality of convex portions 17m to 17p is set to be equal to or larger than the area of the holes 15a to 15d of the rotary shaft 15.

  As described above, the cooling medium supply member 17 is moved in the axial direction by the driving device 20. The driving device 20 is a temperature signal at a predetermined position of the IPM motor 10, for example, an estimated value of a temperature at a predetermined position of the rotor 12 predicted by a driving condition of the IPM motor 10, or an inner circumference of the rotor holding member 16. Based on a signal from a thermometer that measures the temperature of the cooling medium that flows from the surface to the coil end 19a of the stator 11, the required flow rate of the cooling medium that flows on the inner peripheral surface of the rotor holding member 16 is determined. When the flow rate of the cooling medium 31 is increased based on this determination, the driving device 20 moves the cooling medium supply member 17 by a required distance in the direction of the white arrow shown in FIG. Thereby, the opening degree of the holes 15a to 15d of the rotating shaft 15 is increased, and the flow rate of the cooling medium 31 flowing to the rotor support member 16 can be increased as described above.

Further, when the flow rate of the cooling medium 31 is decreased based on the above determination, the driving device 20 moves the cooling medium supply member 17 by a required distance in the direction of the white arrow shown in FIG. Thereby, the opening degree of the holes 15a to 15d of the rotary shaft 15 is reduced, and the flow rate of the cooling medium 31 flowing out to the rotor holding member 16 can be reduced. When it is determined that the temperature at the predetermined position of the rotor 12 is equal to or lower than the predetermined value and that cooling is not necessary, the drive device 20 determines the position of the cooling oil supply member 17 in FIG. ) And continues to hold (that is, the drive device 20 does not control the operation of the cooling oil supply member 17).
In the present embodiment, the cooling medium supply member 17 adjusts the opening degree of the holes 15 a to 15 d of the rotary shaft 15 by the drive device 20 performing the control as described above. The adjustment of the degree of opening may be performed by fully opening and closing the holes 15a to 15d of the rotating shaft 15, opening or closing part of the holes 15a to 15d of the rotating shaft 15, or a combination thereof. . The driving device 20 is realized by using an interface that receives a signal from the thermometer, a microcomputer, and a mechanical component for driving the cooling medium supply member 17.

The end face plate 18 is for preventing the iron core of the rotor 12 from spreading in the axial direction and preventing the permanent magnet 18 from coming off from the iron core of the rotor 12. Is formed. In the present embodiment, the cooling medium 31 flowing out from the non-contact region of the inner peripheral surface of the rotor holding member 16 is prevented from entering the gap between the stator 11 and the rotor 12, and the coil ends 19a to 19a. The end face plate 18 is inclined so as to reach a predetermined position where the amount of heat generated by 19d is large. By doing so, a reduction in the efficiency of the motor due to the infiltration of the cooling medium between the stator 11 and the rotor 12 is avoided, and the stator 11 (coil end) is cooled when the rotor 12 is cooled. 19a) can also be cooled.
In addition, if the end surface plate 18 is arrange | positioned so that the cooling medium 31 which flowed out from the non-contact | abutting area | region of the internal peripheral surface of the rotor holding member 16 may cover the coil ends 19a-19d, the end surface plate 18 will not necessarily be inclined. There is no need. Further, a groove for guiding the cooling medium 31 flowing out from the non-contact area of the inner peripheral surface of the rotor holding member 16 to the coil ends 19a to 19d on the end face plate 18 and for splashing the cooling medium 31. At least one of the protrusions may be formed in addition to the inclination or instead of the inclination.

  The cooling medium 31 flowing out from the rotor holding member 16 is discharged to the lower part of the IPM motor 10 after flowing through the end face plate 18 as described above or directly from the rotor holding member 16. That is, in the present embodiment, the cooling medium 31 accumulated in the lower area of the IPM motor 10 is changed from the lower area of the IPM motor 10 to the rotary shaft 15 → the rotor holding member 16 (→ the end face plate 18) → the IPM motor 10. It is made to circulate in the route of the lower area of.

  As described above, in this embodiment, “the outer peripheral surface in contact with the entire inner peripheral surface of the rotor 12 (iron core)”, “the contact region in contact with the outer peripheral surface of the rotary shaft 15,” and the rotary shaft 15. The cooling medium 31 is caused to flow from the holes 15a to 15d formed in the rotary shaft 15 to the inner peripheral surface of the rotor holding member 16 having the outer peripheral surface of the rotor holding member 16 and the inner peripheral surface having a non-contact region having a gap. I made it. Therefore, the rotor holding member 16 can exchange heat with the rotor 12 (iron core thereof) while being cooled by the cooling medium 31. Since the outer peripheral surface of the rotor holding member 16 is in contact with the entire inner peripheral surface of the rotor 12 (iron core thereof), the cooling medium 31 can exchange heat with the rotor 12 in a wider area than before. it can. Therefore, the rotor 12 can be cooled efficiently, and the temperature rise of the rotor 12 can be suppressed more than before. Thereby, it can suppress rather than the past that the temperature of permanent magnet 13a-13d rises and the function as a magnet of permanent magnet 13a-13d falls. Therefore, for example, as the permanent magnets 13a to 13d, for example, an expensive material such as neodymium-iron-boron (Ne-Fe-B) whose heat resistance is improved by increasing the amount of rare elements added can be used. Get better.

Further, in the present embodiment, since the slope of the gradient spreading toward the end of the axial direction is formed in the non-contact area of the inner peripheral surface of the rotor holding member 16, as the rotor 12 rotates. Due to the centrifugal force acting on the cooling medium, the cooling medium 31 can easily flow in the axial direction along the inclination.
In the present embodiment, the plurality of convex portions 16a to 16j are formed in the circumferential direction in the non-contact region of the inner peripheral surface of the rotor holding member 16 so as to have a predetermined interval in the axial direction. Therefore, the cooling medium 31 can be spread in the circumferential direction on the inner peripheral surface of the rotor holding member 16 to facilitate the flow.
Therefore, the cooling medium 31 can flow over the entire inner peripheral surface of the rotor holding member 16.

In the present embodiment, for example, the cooling medium supply member 17 adjusts the opening degree of the holes 15a to 15d of the rotating shaft 15 based on the temperature at a predetermined position of the IPM motor 10, so that the rotating shaft 15 When the opening degree of the holes 15a to 15d is small, the discharge amount of the pump can be kept low, and waste of driving energy of the pump can be suppressed.
Further, in the present embodiment, the shape of the end face plate 18 is processed so that the cooling medium 31 flowing out from the non-contact area of the inner peripheral surface of the rotor holding member 16 is applied to the coil ends 19a to 19d. When the rotor 12 is cooled, the stator 11 (coil end 19a) can also be cooled.

It should be noted that it is preferable to provide the above-described slopes and convex portions 16a to 16j in the non-contact region of the inner peripheral surface of the rotor holding member 16, because the above-described effects can be obtained, but this is not necessarily the case. do not have to. As the rotor holding member rotates as the rotor 12 rotates, the cooling medium supplied to the non-contact region of the inner peripheral surface of the rotor holding member 16 is compressed by centrifugal force and is axially end of the inner peripheral surface. It is because it is extruded from the opening part.
Further, since the cooling medium 31 can flow from the holes 15a to 15d of the rotating shaft 15 to the non-contact area on the inner peripheral surface of the rotor holding member 16 without providing the cooling medium supply member 17, the cooling medium is not necessarily provided. There is no need to provide the supply member 17 and the driving device 20.

Further, the cooling medium 31 accumulated in the lower part of the IPM motor 10 may be cooled by outside air or water cooling and then supplied to the rotor holding member 16.
Further, the circulation of the cooling medium 31 may be performed using a centrifugal force acting on the cooling medium 31 passing through the holes 15 a to 15 d of the rotating shaft 15 by the rotation of the rotor 12 instead of the pump. In this case, the flow rate of the cooling medium supplied to the non-contact area of the inner peripheral surface of the rotor holding member 16 increases as the rotational speed of the rotating body increases. Further, the flow rate of the cooling medium at the same rotational speed can be adjusted by the cross-sectional area of the holes 15a to 15d of the rotary shaft 15 and the distance from the axis of the outer peripheral side outlet of the holes 15a to 15d.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the holes 15a to 15d of the rotary shaft 15 are opened or closed as necessary by the drive device 20. In contrast, in this embodiment, the holes 15a to 15d of the rotary shaft 15 are kept open. Thus, the present embodiment is different from the first embodiment described above mainly in the configuration in which the cooling medium 31 is guided to the holes 15a to 15d of the rotary shaft 15. Therefore, in the description of the present embodiment, the same portions as those in FIGS. 1 to 4 described above are denoted by the same reference numerals as those in FIGS.

FIG. 5 is a diagram illustrating an example of a configuration of an IPM motor that is an example of a rotating electrical machine. FIG. 5 is a diagram corresponding to FIG.
The IPM motor 50 of this embodiment has a cooling medium supply member 51 instead of the cooling medium supply member 17 of the IPM motor 10 shown in FIG. In the present embodiment, the driving device 20 shown in FIG. 1 is not used.

In FIG. 5, the cooling medium supply member 51 is fixed in an oil passage that is a hollow portion of the rotary shaft 15. In the present embodiment, the cooling medium supply member 51 has a hollow cylindrical shape. Of the side surface of the cooling medium supply member 51, the region at the tip in the axial direction is in contact with the inner peripheral surface of the rotary shaft 15, and the other regions are the inner peripheral surface of the rotary shaft 15 and the holes 15a to 15d. Has a gap with the part.
Thus, in this embodiment, the oil passage 52a transmitted to the power transmission unit and the cooling medium passage 52b transmitted to the holes 15a to 15d of the rotary shaft 15 are individually formed as the oil passage of the rotary shaft 15 (that is, The cooling medium 31 does not go back and forth between the oil passage 52a and the cooling medium 52b), and the holes 15a to 15d of the rotary shaft 15 are not temporarily closed. Therefore, among the effects described in the first embodiment, the effect of adjusting the opening degree of the holes 15a to 15d of the rotary shaft 15 as required can not be obtained, but even if a special driving device is not provided. The discharge amount of a pump that circulates a cooling medium (not shown) is adjusted based on the temperature at a predetermined position of the IPM motor 10 to be supplied to the non-contact area of the inner peripheral surface of the rotor holding member 16. Since the flow rate of the cooling medium can be adjusted, space saving and cost reduction can be realized with respect to those of the first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments described above, the case where the cooling medium 31 is supplied to the non-contact area of the inner peripheral surface of the rotor holding member 16 through the oil passage of the rotary shaft 15 has been described. On the other hand, in this embodiment, the case where the cooling medium 31 is supplied to the rotor holding member 16 without passing through the oil passage of the rotating shaft 15 will be described. Thus, the present embodiment is different from the first and second embodiments described above mainly in the configuration for supplying the cooling medium to the rotor holding member 16. Therefore, in the description of the present embodiment, the same parts as those in the first and second embodiments described above are denoted by the same reference numerals as those in FIGS.

FIG. 6 is a diagram illustrating an example of a configuration of an IPM motor that is an example of a rotating electrical machine. FIG. 5 is a diagram corresponding to FIG.
The IPM motor 60 of the present embodiment does not have the cooling medium supply members 17 and 51 of the IPM motor 10 shown in FIG. 1 and the IPM motor 50 shown in FIG. In the present embodiment, the driving device 20 shown in FIG. 1 is not used. In the present embodiment, nozzles 61a and 61b are provided. Each of the nozzles 61a and 61b may be a single nozzle or may be composed of a plurality of nozzles having different angles.

The nozzles 61a and 61b are attached to the case 14 or the like, and the cooling medium 31 supplied by a pump (not shown) is located as far as possible in the non-contact area of the inner peripheral surface of the rotor holding member 16. The cooling medium 31 is sprayed onto the non-contact area of the inner peripheral surface of the rotor holding member 16 so as to reach the position. In this embodiment, by doing in this way, the cooling medium 31 can be made to flow over the entire inner peripheral surface of the rotor holding member 16 as described in the first embodiment. At this time, the cooling medium 31 may be sprayed as a flux on the non-contact area of the inner peripheral surface of the rotor holding member 16 or may be sprayed in the form of droplets or mist.
Further, in the present embodiment, the cooling medium 31 is circulated along the path of the lower area of the IPM motor 60 → the nozzle 61 a, 61 → the lower area of the IPM motor 60. Further, a heat exchanger may be provided in the circulation path to cool the cooling medium 31.
As described above, even when the nozzles 61a and 61b are used, the effects described in the first and second embodiments can be obtained. The nozzles 61a and 61b may be moved to change the direction of spraying the cooling medium 31 of the nozzles 61a and 61b.

  In each of the embodiments described above, the case where the lubricating oil such as ATF is used as the cooling medium 31 has been described as an example. However, a cooling medium other than the lubricating oil (an oil other than the lubricating oil such as ATF is used as the cooling medium 31). Or a liquid other than oil, or a mixture of gas and liquid) may be supplied to the non-contact area of the inner peripheral surface of the rotor holding member 16. In such a case, the cooling medium flowing out from the non-contact area of the inner peripheral surface of the rotor holding member 16 is an ATF or the like used in a power transmission unit such as a bearing or gear attached to the IPM motor 10. In order not to be mixed with the lubricating oil, a member that separates the circulation path or staying part of the cooling medium from the circulation path or staying part of the lubricating oil is provided.

  In each of the above-described embodiments, an IPM motor has been described as an example of a rotating electrical machine. However, the above-described embodiments can be applied to a rotating electrical machine other than an IPM motor.

  In addition, each of the above-described embodiments is merely a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. . That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

10, 50, 60 IPM motor 11 Stator 12 Rotor 13 Permanent magnet 14 Case 15 Shaft 16 Rotor holding member 17, 51 Cooling oil supply member 18 End face plate 19 Coil end 20 Drive device 61 Nozzle

Claims (12)

A stator having a yoke extending in the circumferential direction, teeth extending in a radial direction from the yoke, and a coil wound around the teeth;
A rotor disposed at a position where the axis and the axis of the stator are the same so that the outer circumferential surface faces the inner circumferential surface of the stator with a gap;
A rotating shaft disposed at a position where the axial center of the stator and the rotor is the same so that the outer peripheral surface is on the axial side of the inner peripheral surface of the rotor;
A rotor holding member disposed between the inner peripheral surface of the rotor and the outer peripheral surface of the rotary shaft;
The rotor holding member has an outer peripheral surface and an inner peripheral surface extending in the direction of the axis,
The outer peripheral surface of the rotor holding member is in contact with the inner peripheral surface of the rotor,
The inner peripheral surface of the rotor holding member has a contact region that contacts the outer peripheral surface of the rotary shaft, and a non-contact region that is spaced from the outer peripheral surface of the rotary shaft,
A rotating electrical machine, wherein a cooling medium is supplied to a non-contact area of an inner peripheral surface of the rotor holding member. In the non-contact area of the inner peripheral surface of the rotor holding member, the interval between the non-contact area of the inner peripheral surface of the rotor holding member and the axis of the rotor is in the direction of the axis. A slope that increases toward the end is formed,
The rotating electrical machine according to claim 1, wherein a cooling medium is supplied from a region relatively above the slope.   A plurality of convex portions extending in the circumferential direction are formed in the non-contact region of the inner peripheral surface of the rotor holding member at intervals in the direction of the axis. Item 3. The rotating electrical machine according to Item 2. A cooling medium flows in the rotating shaft,
4. The hole according to claim 1, wherein a hole is formed in a side surface of the rotary shaft so that the inside of the rotary shaft communicates with a non-contact area of the inner peripheral surface of the rotor holding member. The rotating electrical machine according to claim 1.   5. The rotating electrical machine according to claim 4, further comprising a cooling medium supply member that is disposed in the rotating shaft and operates to open and close a hole of the rotating shaft.   The rotating electrical machine according to any one of claims 1 to 3, further comprising a nozzle that supplies a cooling medium to a non-contact region of an inner peripheral surface of the rotor holding member. A stator having a yoke extending in the circumferential direction, teeth extending in a radial direction from the yoke, and a coil wound around the teeth;
A rotor disposed at a position where the axis and the axis of the stator are the same so that the outer circumferential surface faces the inner circumferential surface of the stator with a gap;
A rotating shaft disposed at a position where the axial center of the stator and the rotor is the same so that the outer peripheral surface is on the axial side of the inner peripheral surface of the rotor;
A rotor holding member disposed between the inner peripheral surface of the rotor and the outer peripheral surface of the rotary shaft;
The rotor holding member has an outer peripheral surface and an inner peripheral surface extending in the direction of the axis,
The outer peripheral surface of the rotor holding member is in contact with the inner peripheral surface of the rotor,
A cooling method for a rotating electrical machine, wherein the inner peripheral surface of the rotor holding member has a contact region that contacts the outer peripheral surface of the rotating shaft and a non-contact region that is spaced from the outer peripheral surface of the rotating shaft. Because
A cooling method for a rotating electrical machine, comprising a supplying step of supplying a cooling medium to a non-contact area of an inner peripheral surface of the rotor holding member. In the non-contact area of the inner peripheral surface of the rotor holding member, the interval between the non-contact area of the inner peripheral surface of the rotor holding member and the axis of the rotor is in the direction of the axis. A slope that increases toward the end is formed,
The cooling method for a rotating electrical machine according to claim 7, wherein the supplying step supplies a cooling medium from a region relatively above the slope.   A plurality of convex portions extending in the circumferential direction are formed in the non-contact region of the inner peripheral surface of the rotor holding member at intervals in the direction of the axis. Item 9. A method for cooling an electric rotating machine according to Item 8. On the side surface of the rotating shaft, a hole is formed through which the inside of the rotating shaft communicates with the non-contact area of the inner peripheral surface of the rotor holding member,
In the supplying step, the cooling medium is caused to flow into the rotating shaft, and the cooling medium is supplied from a hole formed in a side surface of the rotating shaft to a non-contact area of the inner peripheral surface of the rotor holding member. The method for cooling a rotating electric machine according to any one of claims 7 to 9, wherein the cooling method is performed. The rotating electrical machine includes a cooling medium supply member that is disposed in the rotating shaft and operates to open and close the hole of the rotating shaft;
The cooling method of the rotating electrical machine has a driving step of driving the cooling medium supply member,
The rotation according to claim 10, wherein the driving step adjusts an opening degree of the hole of the rotating shaft by driving the cooling medium supply member based on a temperature at a predetermined position of the rotating electric machine. Electric cooling method.   10. The rotating electrical machine according to claim 7, wherein in the supplying step, a cooling medium is supplied to a non-contact area of an inner peripheral surface of the rotor holding member using a nozzle. Cooling method.

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