JP2014135817A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which has a stator core fixed to a housing by a fixing part, enables a refrigerant to be dropped more uniformly to the stator core, and thereby improves the cooling effect.SOLUTION: A stator core 31 of a rotary electric machine 10 is fixed to a housing 20 by bolts 72 respectively inserted into fixing parts 71 which are protrusively formed at an outer peripheral part. A discharge pipe 64 fits into a space S between the stator core 31 and the housing 20. The discharge pipe 64 is provided in a position at the lower part side relative to a position of a rotation shaft 42.

Description

  The present invention relates to a rotating electrical machine including a cooling mechanism, and more particularly to a rotating electrical machine that supplies a refrigerant toward a stator core of the rotating electrical machine.

  2. Description of the Related Art Conventionally, as a rotating electrical machine having a cooling mechanism, there is a rotating electrical machine that cools a coolant, for example, lubricating oil such as Automatic Transmission Fluid (ATF) by discharging it to a coil end or a stator core. For example, in the rotating electrical machine disclosed in Patent Document 1, a refrigerant tank in which a refrigerant is stored is provided in a housing, and the refrigerant tank is viewed when the rotating electrical machine is viewed from the axial direction of the rotating shaft of the rotor. It is provided at a position to be the upper part of the housing. A net-like plate is provided on the floor of the refrigerant tank, and the refrigerant in the tank flows out through holes formed in the plate and cools by being dropped onto the stator core located at the lower part of the refrigerant tank. Is called.

  Further, the rotating electrical machine disclosed in Patent Document 2 cools a coil end by supplying a refrigerant through a refrigerant passage provided in the housing in the axial direction. In the rotating electrical machine, a plurality of fixing portions (holding members in the literature) are provided on the outer peripheral portion of the stator core, and the stator core is fixed to the housing by a fastening member that penetrates the fixing portion in the axial direction. Each cooling passage is provided at a position that avoids a fixing portion protruding outward in the radial direction on the outer peripheral portion of the stator core. Then, the refrigerant cools the coil end by being discharged from the discharge hole formed in the axial end of the refrigerant passage toward the coil end and flowing from the upper end to the lower portion of the rotating electrical machine through the coil end.

JP 2012-5158 A JP 2009-17700 A

  Incidentally, like the rotating electrical machine disclosed in Patent Document 2, the stator core is provided with a fixing portion for fixing to the housing. Therefore, for example, when trying to cool the stator core using the cooling mechanism disclosed in Patent Document 1, the flow of the refrigerant flowing along the outer peripheral surface of the stator core from the refrigerant tank is restricted at the fixed portion protruding radially outward. Residence may occur. As a result, there is a problem in that the flow of the refrigerant that travels along the outer peripheral portion becomes non-uniform on the upper side and the lower side of the stator core and the cooling effect is reduced.

  The present invention relates to a rotating electrical machine in which a stator core is fixed to a housing by a fixing portion, and provides a rotating electrical machine capable of enhancing the cooling effect by uniformly dripping refrigerant with the stator core.

  A rotating electrical machine according to one aspect of the present invention includes a rotor core that is provided so as to be integrally rotatable with respect to a rotating shaft, and a fixing portion that is provided on a radially outer side of the rotor core and that protrudes radially outward on an outer peripheral portion. The stator core is fixed by a fixing member inserted in the axial direction of the rotating shaft with respect to the fixed portion, and the stator core extends in the axial direction, the inner peripheral surface being disposed with a clearance from the outer peripheral surface of the stator core. A refrigerant passage provided with a first discharge part for discharging a refrigerant for cooling the stator core, and a supply means for supplying the refrigerant to the refrigerant passage. And at least one is provided at a position on the lower side compared to the position of the rotating shaft when viewed from the axial direction of the rotating shaft.

  In the rotating electrical machine, the stator core is fixed to the housing by a fastening member that is inserted into a fixing portion formed on the outer peripheral portion. The stator core and the housing are disposed with a gap therebetween, and a refrigerant passage is provided in the gap. Here, for example, when the refrigerant is supplied to the stator core from the upper side, if the refrigerant flowing along the outer peripheral surface of the stator core is restricted from flowing in the fixed portion, the refrigerant is generated between the upper side and the lower side of the stator core. Flow is uneven.

  Therefore, in the rotating electrical machine, at least one refrigerant passage is provided at a position that is lower than the position of the rotating shaft when the rotating electrical machine is disposed and viewed from the axial direction of the rotating shaft. In such a configuration, the refrigerant supplied by the supply means is supplied from the first discharge portion of the refrigerant passage provided on the lower side of the stator core to the non-uniform portion, so that the refrigerant is uniformly dropped by the stator core. The cooling effect can be enhanced.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to claim 1, wherein the refrigerant passage is provided at each of the positions on both sides in the circumferential direction of the fixed portion.

  In the rotating electrical machine, it is possible to more effectively enhance the cooling effect on the stator core by providing the refrigerant passages on both sides in the circumferential direction of the fixed portion where the flow of the refrigerant traveling around the outer periphery of the stator core is likely to be uneven. Become.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to claim 1 or 2, wherein the refrigerant passage has a first discharge portion in accordance with a position of a gap between the stator core and the housing. It is provided.

  In the rotating electrical machine, by providing the first discharge portion in accordance with the position of the gap between the stator core and the housing, the refrigerant discharged from the first discharge portion is efficiently supplied into the gap space, that is, efficiently. It can be supplied to the stator core and the cooling effect can be enhanced.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 3, wherein the fixing portion is a fixing portion adjacent in the circumferential direction in the outer peripheral portion of the stator core. It is provided at three positions where the distance between them is the same, and two refrigerant passages are provided between the circumferential directions of the fixed portion.

  In the rotating electrical machine, in the rotating electrical machine in which three fixed portions are provided at intervals of 120 degrees on the outer peripheral portion of the stator core and two refrigerant passages are provided between the circumferential directions of each fixed portion, the refrigerant is uniformly dropped by the stator core. The cooling effect can be enhanced.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 4, wherein the refrigerant passage is wound around the stator core at an end portion in the axial direction. A second discharge part is provided according to the position of the coil end protruding from the axial end surface of the stator core of the coil, and the refrigerant is discharged to the coil end.

  In the rotating electrical machine, the second discharge unit is provided in the refrigerant passage according to the position of the coil end, and the refrigerant is discharged from the second discharge unit to the coil end. Thus, both the stator core and the coil end that generate heat when the rotating electrical machine is driven can be cooled by discharging the refrigerant from the first and second discharge portions provided in the same refrigerant passage. Further, for example, it is not necessary to separately provide a refrigerant passage for cooling the coil end separately from the refrigerant passage for cooling the stator core, and the cooling mechanism can be simplified.

  A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 5, wherein the supply unit includes a gear mechanism that is drivingly connected to the rotating shaft, and a stator core. A storage part in which the discharged refrigerant is stored and a part of the gear mechanism is immersed in the refrigerant, and the gear mechanism scrapes the refrigerant in the storage part to the upper part of the housing as the rotating shaft rotates. It is characterized by.

  In the rotating electrical machine, a part of the gear mechanism that is drivingly connected to the rotating shaft is used as a supply unit, and the refrigerant discharged to the stator core is scraped up from the storage portion by using the driving of the gear accompanying the rotation of the rotating shaft. It can be circulated. This makes it possible to circulate the refrigerant using a part of the existing gear mechanism without using a pump or the like.

  ADVANTAGE OF THE INVENTION According to this invention, regarding the rotary electric machine with which a stator core is fixed to a housing by a fixing | fixed part, the rotary electric machine which can dripping a refrigerant | coolant uniformly with a stator core and can improve a cooling effect can be provided.

It is a conceptual sectional view showing the rotary electric machine concerning this embodiment. It is the sectional view on the AA line in FIG. 1, and a partial enlarged view. It is a perspective view which shows the pipe for discharge and a stator core. It is a conceptual sectional view showing another rotating electrical machine. It is a conceptual sectional view showing another rotating electrical machine. It is the BB sectional view taken on the line in FIG. It is the elements on larger scale which show another pipe for discharge. It is a perspective view which shows another pipe for discharge.

  Hereinafter, an embodiment embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a drawing in which the rotating electrical machine 10 is cut at a position where a discharge pipe 64 described later is illustrated. First, the rotating electrical machine 10 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, the rotating electrical machine 10 includes a motor case 11 that is partitioned into two housing portions 11B and 11C by a wall portion 11A. A housing 20 is provided integrally with the motor case 11 in the accommodating portion 11B. The housing 20 is a cylindrical housing (see FIG. 2), and a stator 21 and a rotor 22 are accommodated in an inner diameter portion. Note that a pump 63 for circulating a refrigerant 61 described later is accommodated in the accommodating portion 11C.

  The stator 21 has a stator core 31 fixed to the housing 20 and a coil 32 wound around the stator core 31. The stator core 31 has, for example, a substantially cylindrical shape formed by laminating a plurality of electromagnetic steel plates. The stator core 31 is formed with teeth 34 (see FIG. 2) that protrude radially inward on the inner peripheral portion and are provided at equal intervals along the circumferential direction. Between the circumferential directions of the teeth 34, slots extending in the axial direction are formed, and the coil 32 is wound around the teeth 34 through the slots. The coil 32 includes coils corresponding to three-phase alternating current phases (U-phase, V-phase, and W-phase), and rotating magnetic flux is generated by supplying alternating current of each phase. Each phase coil 32 is wound over a plurality of slots so as to cover the axial end surface of the stator core 31, and a coil end 36 is formed at a portion protruding from the axial end surface of the stator core 31. A rotor 22 is disposed on the radially inner side of the stator 21.

  The rotor 22 includes a rotor core 41, a rotating shaft 42, a secondary conductor 43, and a pair of short-circuit rings 44. For example, the rotor core 41 has a substantially cylindrical shape formed by laminating a plurality of electromagnetic steel plates. In the rotor 22, a rotation shaft 42 is inserted through a central portion of the rotor core 41 in the radial direction, and the rotor core 41 is fixed to the rotation shaft 42 so as to be integrally rotatable.

  The wall portion 11 </ b> A is formed in a flat plate shape that faces the axial end surfaces of the stator core 31 and the rotor core 41 in the axial direction of the rotation shaft 42, and a bearing 51 is provided at a central portion through which the rotation shaft 42 is inserted. Further, the motor case 11 is provided with a bearing 52 at a central portion of a portion facing the wall portion 11A in the axial direction. One end (left side in the figure) of the rotating shaft 42 is supported by a bearing 52, and the other end is supported by a bearing 51 of the wall portion 11A. Further, the outer peripheral surface of the rotor core 41 and the inner peripheral surface (the surface on the rotating shaft 42 side) of the stator core 31 are opposed to each other at a predetermined interval in the radial direction. Accordingly, the rotor 22 is rotatably supported around the axis of the rotation shaft 42 on the radially inner side of the stator 21. The rotating shaft 42 is driven and connected to a connecting gear (not shown) or the like that extends in the axial direction on the end side supported by the bearing 51 and outputs the rotational drive of the rotor 22 to an external device.

  In the rotor core 41, secondary conductors 43 are inserted at equal intervals along the circumferential direction of the rotor core 41 so as to surround the periphery of the rotation shaft 42. The secondary conductor 43 protrudes from the end surface of the rotor core 41 at both ends in the axial direction. At both ends of the rotor core 41, annular short-circuit rings 44 are provided. The short-circuit ring 44 is a member called a so-called end ring or end ring. Each end of the secondary conductor 43 in the axial direction is integrally formed with the short-circuit ring 44. The plurality of secondary conductors 43 are short-circuited by connecting ends to a pair of short-circuiting rings 44. That is, the rotor 22 is configured as a so-called cage rotor. Note that the secondary conductor 43 and the short-circuit ring 44 are integrally formed using, for example, aluminum die casting.

  In the rotating electrical machine 10 configured as described above, a rotating magnetic flux generated when a three-phase alternating current is supplied to the coil 32 of the stator 21 and an induced current generated in the secondary conductor 43 of the rotor 22 are chained. The rotor 22 is rotationally driven by the crossing. At this time, in the rotating electrical machine 10, when the drive current is supplied to the coil 32, the coil 32 including the coil end 36 and the stator core 31 generate heat. Therefore, the rotating electrical machine 10 of the present embodiment is provided with a cooling mechanism for cooling the stator core 31 and the coil end 36 that generate heat when driven.

  Next, the cooling mechanism of the rotating electrical machine 10 will be described. The rotating electrical machine 10 is provided with a mechanism for cooling the stator core 31 and the coil end 36 by circulating a lubricant 61, for example, lubricating oil such as Automatic Transmission Fluid (ATF). More specifically, the rotating electrical machine 10 includes a refrigerant tank 62, a pump 63, and a plurality of discharge pipes 64. The refrigerant tank 62 is provided integrally with the housing 20. In addition, the refrigerant tank 62 is provided in the upper part of the motor case 11 and the housing 20 when, for example, the rotating electrical machine 10 is disposed in the engine room of the vehicle so that the axial direction of the rotating shaft 42 is parallel to the mounting surface. It is provided at a position (upper side in FIG. 1). In the following description, the vertical direction of FIG. 1 is referred to as the vertical direction of the housing 20, and the direction orthogonal to the paper surface of FIG. 1 is referred to as the horizontal direction of the housing 20.

  The refrigerant tank 62 is formed in a substantially rectangular parallelepiped extending along the axial direction, and the refrigerant 61 circulating in the rotating electrical machine 10 is temporarily stored. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and is a view as seen from the axial direction of the rotating shaft 42 when the rotating electrical machine 10 is used. 2 omits the motor case 11 and the short-circuit ring 44 shown in FIG. The refrigerant tank 62 has a rectangular shape with a long side in the left-right direction of the housing 20 cut along a plane along a direction perpendicular to the axial direction. As shown in FIG. 1, the discharge port of the pump 63 is connected to the refrigerant tank 62 via a connecting pipe 66. The connecting pipe 66 is connected to the upper side of the refrigerant tank 62. The pump 63 sucks up the refrigerant 61 stored in the storage unit 11 </ b> D provided in the lower part of the motor case 11 and circulates it into the refrigerant tank 62. The connecting pipe 66 is provided with a check valve at a connection portion with the refrigerant tank 62, for example, a check valve for allowing the flow of the refrigerant 61 toward the refrigerant tank 62 while preventing the reverse flow. Also good.

  A plurality (only one is shown in FIG. 1) of connecting pipes 67 is connected to the bottom of the refrigerant tank 62. A plurality of discharge pipes 64 are provided between the stator core 31 and the housing 20. Each discharge pipe 64 is formed along the axial direction, and one end portion in the axial direction (the right end portion in the drawing) is connected to the connecting pipe 67. The refrigerant 61 stored in the refrigerant tank 62 flows into the discharge pipes 64 via the connection pipes 67.

  As shown in FIG. 2, the stator core 31 is provided with a fixed portion 71 formed to protrude outward in the radial direction on a cylindrical outer peripheral portion. The fixed portion 71 has a circumferential width that decreases toward the outside in the radial direction, and has a circular arc at the tip. A plurality of (three in the present embodiment) fixed portions 71 are formed at equal intervals (120 degrees in the present embodiment) along the circumferential direction in the outer peripheral portion of the stator core 31. A plurality of discharge pipes 64 (six in this embodiment) are provided at equal intervals along the circumferential direction of the stator core 31. Two discharge pipes 64 are provided between the fixing portions 71 adjacent in the circumferential direction. In other words, the discharge pipes 64 are provided on each of the upper side and the lower side of the two fixing parts 71 on both sides in the circumferential direction of the fixing part 71 and on the upper side.

  The discharge pipes 64 are provided with two discharge pipes 64 at substantially the same position as the rotary shaft 42 in the vertical direction of the housing 20. Further, the discharge pipe 64 is provided with two discharge pipes 64 at a position on the lower side as compared with the position of the rotating shaft 42. The two discharge pipes 64 provided on the lower side are disposed at positions that are substantially symmetrical on both the left and right sides with respect to a straight line in the vertical direction passing through the center of the rotating shaft 42. In other words, the two lower discharge pipes 64 are provided at the lower right and the lower left of the outer peripheral portion of the stator core 31 as viewed in the axial direction of the housing 20 (in the direction orthogonal to the paper surface in FIG. 2).

  Each fixing portion 71 is formed with a through hole that penetrates the stator core 31 in the axial direction, and a bolt 72 is inserted through the through hole. The stator 21 is fixed to the housing 20 by, for example, fastening the end of the bolt 72 in the axial direction to the housing 20 with a nut (not shown). The bolt 72 may be directly fixed to the housing 20 without using a nut or the like. As shown in the enlarged view of FIG. 2, the outer peripheral surface 31 </ b> A of the stator core 31 fixed by the bolt 72 is separated from the inner peripheral surface 20 </ b> A of the housing 20 with a gap S of a predetermined interval. A concave portion 31 </ b> B is formed on the outer peripheral portion of the stator core 31 in accordance with the shape of the discharge pipe 64. The fixed part 71 and the concave part 31 </ b> B described above are formed, for example, by press working for forming the stator core 31 from a magnetic steel sheet. In addition, a concave portion 20 </ b> B is formed in the inner peripheral portion of the housing 20 so as to match the shape of the discharge pipe 64. The discharge pipe 64 is fitted and fixed in a space formed by the gap S and the recesses 20B and 31B.

  FIG. 3 is a perspective view showing the discharge pipe 64 and the stator core 31 in FIG. 2 and shows a state where the housing 20 is removed. In addition, the arrow shown with a dotted line in FIG. 3 has shown the direction where the refrigerant | coolant 61 is discharged. As shown in FIG. 3, the discharge pipe 64 is formed in a cylindrical shape along the axial direction. The discharge pipe 64 is formed with a first discharge hole 81 having a circular cross-sectional shape that communicates the cylindrical interior and exterior. The first discharge holes 81 are formed at predetermined intervals along the axial direction, and a pair of first discharge holes 81 are formed at each position in the axial direction. As shown in the enlarged view of FIG. 2, the first discharge holes 81 have a pair of first discharge holes 81 formed at the same position in the axial direction in accordance with the position and shape of the gap S between the stator core 31 and the housing 20. Is formed. Thereby, the refrigerant 61 supplied from the refrigerant tank 62 to the discharge pipe 64 is efficiently supplied from the plurality of first discharge holes 81 toward the space S.

  As shown in FIG. 1, the discharge pipe 64 is formed with second discharge holes 82 and 83 for cooling the coil end 36. The second discharge hole 82 is formed so as to penetrate the distal end portion opposite to the base end portion connected to the connecting pipe 67 of the discharge pipe 64. The refrigerant 61 supplied to the tip of the discharge pipe 64 flows out from the second discharge hole 82 and is discharged toward the coil end 36. Further, the discharge pipe 64 has a second discharge hole 83 formed on the base end side so as to match the position of the coil end 36 in the axial direction. The refrigerant 61 supplied to the discharge pipe 64 is supplied from the second discharge holes 83 toward the coil end 36.

  The refrigerant 61 discharged from the discharge holes 81 to 83 flows through the stator core 31 and the coil end 36 and the like into the storage portion 11D provided at the lower portion of the motor case 11. In the rotating electrical machine 10, the pump 63 is driven as the rotor 22 is rotated, and the refrigerant 61 stored in the storage unit 11 </ b> D is sucked up into the refrigerant tank 62, whereby the refrigerant 61 circulates in the motor case 11 and the stator core. 31 and the coil end 36 are cooled. Incidentally, as shown in FIG. 2, a connecting hole 20 </ b> C that connects both end faces in the axial direction is provided in the lower portion of the housing 20, and the refrigerant 61 stored in the storage portion 11 </ b> D flows through the connecting hole 20 </ b> C in the axial direction. May be.

According to the above-described embodiment, the following effects can be obtained.
(1) The stator core 31 of the rotating electrical machine 10 is fixed to the housing 20 by a bolt 72 that is inserted into a fixing portion 71 that is formed to protrude from the outer peripheral portion. The discharge pipe 64 is fitted in the gap S between the stator core 31 and the housing 20. The discharge pipes 64 are provided with two discharge pipes 64 at positions lower than the position of the rotary shaft 42 in the axial direction of the housing 20. In such a configuration, the refrigerant 61 discharged from the upper discharge pipe 64 is regulated by the fixing portion 71 and the two discharge pipes 64 are provided on the lower side where the flow is likely to be non-uniform. The stator core 31 can drop uniformly to enhance the cooling effect.

(2) In the rotating electrical machine 10, the discharge pipes 64 are provided on both sides in the circumferential direction of the fixed portion 71 where the flow of the refrigerant 61 is likely to be non-uniform, and the cooling effect can be enhanced more effectively.
(3) The first discharge hole 81 is formed in accordance with the position and shape of the gap S between the stator core 31 and the housing 20 (see the enlarged view of FIG. 2), and the refrigerant 61 supplied to the discharge pipe 64 is the first. It is supplied from one discharge hole 81 toward the space S. Thereby, the refrigerant 61 discharged from the first discharge holes 81 can be efficiently supplied to the stator core 31 and the cooling effect can be enhanced.

(4) Second discharge holes 82 and 83 are formed in the discharge pipe 64 in accordance with the position of the coil end 36. Thereby, both the stator core 31 and the coil end 36 that generate heat in accordance with the rotation drive can be cooled by discharging the refrigerant 61 from the first and second discharge holes 81 to 83 of the same discharge pipe 64. Further, for example, it is not necessary to separately provide the discharge pipe 64 for cooling the coil end 36 separately from the discharge pipe 64 for cooling the stator core 31, and the cooling mechanism can be simplified.

(5) On the outer periphery of the stator core 31, there is provided a recess 31B formed in accordance with the shape of the discharge pipe 64, and the discharge pipe 64 is fitted and fixed in the recess 31B. In such a configuration, it is easy to fix the discharge pipe 64 and adjust the position of the first discharge hole 81 with respect to the gap S.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the rotating electrical machine 10 may be appropriately changed to a configuration in which at least one discharge pipe 64 is provided below the rotating shaft 42 in the axial view of the housing 20.

  For example, the rotating electrical machine 10 may have a configuration in which the discharge pipe 64 is not provided on the upper side. As shown in FIG. 4, the rotating electrical machine 10 </ b> A is provided at a position where the bottom of the refrigerant tank 62 is close to the outer peripheral surface of the stator core 31, and a net-like plate 91 is provided at the bottom of the refrigerant tank 62. Yes. The refrigerant 61 stored in the refrigerant tank 62 flows out through holes formed in the plate 91 and is dropped onto the stator core 31 positioned below the refrigerant tank 62 to be cooled. Even in the rotating electrical machine 10A having such a configuration, the refrigerant 61 dripped from the upper refrigerant tank 62 is restricted by the fixing portion 71. Therefore, by providing the discharge pipe 64 on the lower side, the refrigerant 61 is supplied to the stator core. The cooling effect can be enhanced by dropping evenly by 31.

  Moreover, in the said embodiment, although the 2nd discharge holes 82 and 83 as a 2nd discharge part which discharges the refrigerant | coolant 61 to the coil end 36 were comprised as a hole which penetrates the pipe 64 for discharge, it is not limited to this. For example, the discharge pipe 64 of the rotating electrical machine 10A has a nozzle 92 as a second discharge portion. The nozzles 92 are provided at both ends of the discharge pipe 64 in the axial direction, and openings are formed toward the coil end 36. The refrigerant 61 supplied to the discharge pipe 64 is discharged from the nozzle 92 toward the coil end 36.

  In the above embodiment, the pump 63 is used as the supply means for supplying the refrigerant 61 to the discharge pipe 64, but the present invention is not limited to this. For example, the rotating electrical machine 10 </ b> B shown in FIG. 5 is configured to use a gear mechanism that is drivingly connected to the rotating shaft 42 as supply means. More specifically, the rotating electrical machine 10B is provided with a gear mechanism in which a small-diameter gear 93 fixed to the rotary shaft 42 so as to be integrally rotatable and a large-diameter gear 94 that meshes with the small-diameter gear 93 are drivingly connected. The large-diameter gear 94 is immersed in the refrigerant 61 that is partly stored on the lower portion side in the storage portion 11D.

  FIG. 6 shows a cross-sectional view of FIG. 5 taken along line BB. As shown in FIG. 6, the refrigerant tank 62 is fixed to the inner peripheral surface of the motor case 11, and an opening 62 </ b> A is formed on a side wall on one side in the left-right direction (right side in the drawing). In the rotating electrical machine 10 </ b> B, when the small-diameter gear 93 rotates with the rotation of the rotating shaft 42, the large-diameter gear 94 that meshes with the small-diameter gear 93 rotates. The refrigerant 61 in the storage unit 11D is scraped up from the storage unit 11D as the large-diameter gear 94 rotates, and flows into the refrigerant tank 62 from the opening 62A. In such a configuration, the refrigerant 61 discharged to the stator core 31 by using the gears 93 and 94 that are drivingly connected to the rotating shaft 42 as the supply means and using the driving of the gears 93 and 94 accompanying the rotation of the rotating shaft 42. Can be circulated from the reservoir 11D. As a result, the refrigerant 61 can be circulated using a part of the existing gear mechanism without using the pump 63. Each of the gears 93 and 94 may be used in combination with a gear that outputs the rotational drive of the rotary shaft 42 to an external device, or may be provided as a dedicated gear for scooping up the refrigerant 61.

  Moreover, in the said embodiment, it is good also as a structure provided with the pump which pumps the refrigerant | coolant 61 to the discharge pipe 64, for example. In such a configuration, it is possible to forcibly inject the refrigerant 61 from the first and second discharge holes 81 to 83 to improve the circulation efficiency of the refrigerant 61 and enhance the cooling effect.

  In the above embodiment, the stator core 31 may have a configuration in which the recess 31B is omitted. For example, as shown in FIG. 7, the stator core 31 has a cylindrical shape with the recess 31B omitted, and the discharge pipe 64 is formed in a shape in which the cross-sectional shape in the direction perpendicular to the axial direction is substantially semicircular. May be configured as a shape along the outer peripheral surface of the stator core 31.

  Moreover, in the said embodiment, the shape of the 1st discharge hole 81 formed in the pipe for discharge 64 is an example, and may be changed suitably. For example, as shown in FIG. 8, the shape of the first discharge hole 81 may be configured as a substantially rectangular slit having a long side extending in the axial direction and having a cross-sectional shape along the axial direction. In this case, it is preferable to provide the first discharge holes 81 formed as slits in accordance with the positions of the gaps S.

  The configuration of each of the above embodiments is an example, and the shape, number, and the like may be changed as appropriate. For example, the shape, the number, and the like of the fixing portion 71 are examples, and may be changed as appropriate. Moreover, although the rotary electric machine 10 is configured as a so-called squirrel-cage induction motor, it may be configured as a motor using a permanent magnet such as SPM or IPM. The stator 21 is not limited to being driven by a three-phase alternating current, but may be driven by a single-phase alternating current, a two-phase alternating current, or a multiphase alternating current of four or more phases. Moreover, although the rotor core 41 was formed by laminating electromagnetic steel plates, it may be formed of an iron block or a powder-molded magnetic body (SMC: Soft Magnetic Composites).

The correspondence with the terms in the claims is as follows.
The rotating electrical machines 10, 10A and 10B are examples of the rotating electrical machine, the housing 20 is an example of the housing, the inner peripheral surface 20A is an example of the inner peripheral surface of the housing, and the rotor 22 is an example of the rotor. As an example of the stator, the stator core 31 is an example of the stator core, the outer peripheral surface 31A is an example of the outer peripheral surface of the stator core, the rotor core 41 is an example of the rotor core, the rotating shaft 42 is an example of the rotating shaft, The secondary conductor 43 is an example of a secondary conductor, the refrigerant 61 is an example of a refrigerant, the discharge pipe 64 is an example of a refrigerant passage, the storage unit 11D, the refrigerant tank 62, a pump 63, a connection pipe 66, 67 and the plate 91 are examples of supply means for supplying the refrigerant, the fixing portion 71 is an example of the fixing portion, and the bolt 72 is As an example of the fastening member, the first discharge hole 81 is an example of the first discharge part, the second discharge holes 82 and 83 and the nozzle 92 are an example of the second discharge part, and the small diameter gear 93 and the large diameter gear 94 are As an example of the gear mechanism, the gap S can be cited as an example of the gap.

  10, 10A, 10B ... Rotary electric machine, 20 ... Housing, 20A ... Inner peripheral surface, 31 ... Stator core, 31A ... Outer peripheral surface, 41 ... Rotor core, 42 ... Rotary shaft, 61 ... Refrigerant, 64 .. discharge pipe, 71 .. fixing part, 72 .. bolt, 81 .. first discharge hole, 82, 83 .. second discharge hole, S.

Claims (6)

A rotor core provided so as to be integrally rotatable with respect to the rotation shaft;
A stator core provided on a radially outer side of the rotor core and having a fixed portion protruding outward in a radial direction on an outer peripheral portion;
A housing in which the stator core is fixed by a fastening member that is inserted in the axial direction of the rotating shaft with respect to the fixed portion, and an inner peripheral surface of the housing is disposed with a clearance from the outer peripheral surface of the stator core;
A refrigerant passage provided in the gap between the stator core and the housing extending in the axial direction and provided with a first discharge part for discharging a refrigerant for cooling the stator core;
Supply means for supplying the refrigerant to the refrigerant passage,
The rotating electrical machine according to claim 1, wherein at least one of the refrigerant passages is provided at a position on a lower side compared to a position of the rotating shaft when the rotating electrical machine is disposed and viewed from an axial direction of the rotating shaft. The rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the refrigerant passage is provided at each of positions on both sides in the circumferential direction of the fixed portion. The rotating electrical machine according to claim 1 or 2,
The rotating electrical machine according to claim 1, wherein the refrigerant passage is provided with the first discharge portion corresponding to a position of the gap between the stator core and the housing. A rotating electrical machine according to any one of claims 1 to 3,
The fixing portions are provided at three positions in the outer peripheral portion of the stator core where the fixing portions adjacent in the circumferential direction have the same interval.
The rotary electric machine is characterized in that two refrigerant passages are provided between the circumferential directions of the fixed portion. The rotating electrical machine according to any one of claims 1 to 4,
The refrigerant passage is provided in accordance with a position of a coil end protruding from an end surface in the axial direction of the stator core of a coil wound around the stator core at an end portion in the axial direction. A rotating electrical machine comprising: a second discharge unit that is discharged in this manner. A rotating electrical machine according to any one of claims 1 to 5,
The supply means includes
A gear mechanism drivingly connected to the rotating shaft;
A storage section in which the refrigerant discharged to the stator core is stored and a part of the gear mechanism is immersed in the refrigerant;
The rotating electrical machine characterized in that the gear mechanism scoops up the refrigerant in the reservoir to the upper part of the housing as the rotating shaft rotates.

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