JP2010041770A - Rotary electric machine, and system for cooling the same - Google Patents

Abstract

An object of the present invention is to increase the cooling performance of a rotating electrical machine without increasing the size of the rotating electrical machine.
A rotating electrical machine includes a stator that is opposed to an outer diameter side of a rotor, and includes a stator including a resin mold coil end and a plurality of first refrigerant flow paths. The resin-molded coil end 26a includes a plurality of coil end elements 60 that are portions protruding in the axial direction from the axial end surface of the stator core 12 in the stator coils 58u, 58v, and 58w provided at a plurality of locations in the circumferential direction, and a plurality of coils. A resin 64 that embeds the end element 60 is used. Each first refrigerant flow path 54 is disposed between two coil end elements 60 that are adjacent to each other in the circumferential direction among the plurality of coil end elements 60, and the outer periphery of the resin molded coil end 26 a and the plurality of coil end elements 60. The coil end element 60 is made to communicate with the inner peripheral side portion.
[Selection] Figure 1

Description

  The present invention relates to a rotating electrical machine including a stator having a resin molded coil end and a first refrigerant flow path, and a rotating electrical machine cooling system.

  2. Description of the Related Art Conventionally known rotating electrical machines such as vehicle electric motors include a stator and a rotor. Further, conventionally, a stator as shown in FIG. 5 has been considered as a stator constituting a rotating electrical machine. FIG. 5 is a schematic perspective view of a first example of a stator conventionally considered. The stator 10 shown in FIG. 5 is provided with teeth 14 projecting in the radial direction at a plurality of locations in the circumferential direction of the inner circumferential surface of the stator core 12 made of laminated steel plates, and the stator coil 16 is wound around each tooth 14 by concentrated winding. It is turning. Further, in the stator coils 16 provided at a plurality of locations in the circumferential direction of the stator 10, both end portions in the axial direction of the stator 10 are formed by a plurality of coil end elements 18 that are portions protruding in the axial direction from both end surfaces in the axial direction of the stator core 12. A pair of coil ends 20 (only one coil end 20 is shown in FIG. 5) is provided. The coil end 20 is considered to be hardened by impregnating with varnish or dropping varnish. The reason why the coil end 20 is hardened in this way is to ensure insulation between the stator coils 16 of each phase and to ensure the mechanical strength of the coil end 20.

  In addition, mounting portions 22 for fixing the stator 10 to a motor case (not shown) are provided at a plurality of locations in the circumferential direction on the outer peripheral surface of the stator core 12. Although not shown in the drawings, a lead-out line is led out from a part of the coil end 20, and the lead-out line can be connected to an external circuit such as an inverter (not shown). Further, in FIG. 5, the stator coil 16 is wound around the teeth 14 by concentrated winding, but it is also conceivable to perform distributed winding in which the stator coil 16 is wound so as to straddle a plurality of teeth 14.

  FIG. 6 is a schematic perspective view of a second example of a stator conventionally considered. 7 is a side view of FIG. 6, and FIG. 8 is a schematic cross-sectional view showing a state where a rotating electrical machine is configured by combining the stator shown in FIG. 6 with a rotor. FIG. 9 is a diagram seen from one side in the left-right direction of FIG. 8 to the other side. The stator 24 shown in FIGS. 6 to 7 is axially extended from both axial end surfaces of the stator core 12 in a stator coil 16 (see FIG. 5) wound around teeth 14 (see FIG. 5) provided at a plurality of locations in the circumferential direction. By embedding a plurality of coil end elements 18 (see FIG. 5), which are portions protruding in the shape, with resin, that is, resin molding, a resin mold coil end 26 that is a pair of coil ends is formed. As described above, the reason why the coil end is the resin-molded coil end 26 is that a plurality of coil end elements are used in order to reduce the cost by automation when manufacturing the rotating electrical machine and when the coil end is cooled by cooling oil or the like. This is for improving the heat dissipation performance of the entire 18. Other configurations are the same as those of the first example of the stator shown in FIG.

  The rotating electrical machine including the stator 24 having the resin molded coil end 26 is cooled as follows. For example, as shown in FIGS. 8 and 9, a rotating electrical machine cooling system 32 is configured by providing a pair of refrigerant supply units 30 above the rotating electrical machine 28. The refrigerant supply unit 30 ejects cooling oil, which is a refrigerant, downward. The rotating electrical machine 28 rotatably supports a rotating shaft 34 in a motor case (not shown), and the stator 24 is opposed to the outer diameter side of a rotor 36 provided at an intermediate portion of the rotating shaft 34. The pair of refrigerant supply units 30 is disposed above the pair of resin mold coil ends 26. For example, each refrigerant supply unit 30 is constituted by two refrigerant supply ports or nozzles provided at both ends of the upper end of the motor case, and each refrigerant supply unit is a cooling oil supply source such as a discharge port of an oil pump (not shown). To communicate. The cooling oil flows on the surface of the resin mold coil end 26 as shown by broken line arrows in FIGS. 8 and 9 to cool the resin mold coil end 26. The cooling oil that has flowed down is discharged through a discharge port provided in the lower part of the motor case.

  Patent Document 1 discloses a motor generator having a rotor and a stator. The stator is provided with a partition wall that surrounds the rotor on the axial end surface on the surface of the resin portion that covers the stator coil, and the axial direction of the resin portion. In the end face, a structure is described in which a cooling oil supply unit capable of supplying a cooling medium is provided in a region outside the innermost peripheral partition. In addition, a cooling oil passage is provided in a housing that accommodates the stator and the rotor, and cooling oil supplied from a cooling oil supply source can be supplied to the cooling oil supply section via the cooling oil passage. The innermost partition part of the partition part is formed so as to surround at least the rotor. Therefore, when the cooling oil is supplied to the axial end surface of the resin part, the cooling oil is between the stator and the rotor. It is said that it can suppress flowing into the gap.

  In addition, the following structure is also considered as a rotating electrical machine cooling system which is a cooling structure of a rotating electrical machine. FIG. 10 is a diagram showing a partial cross section of an electric rotating machine and an oil circulation path in an example of a rotating electric machine cooling system conventionally considered. The rotating electrical machine cooling system 32 a includes a rotating electrical machine 28, an oil circulation path 38, an oil pump 42, and an oil pan 40. The rotating electrical machine 28 includes a stator 24 fixed inside the motor case 44 and a rotor 36. A rotating shaft 34 is rotatably supported via bearings 46 at both axial ends of the motor case 44. The rotor 36 provided on the outer diameter side of the intermediate portion of the rotating shaft 34 is opposed to the stator 24.

  A cooling oil supply port 48 and a cooling oil discharge port 50 are provided in the motor case 44. The cooling oil supply port 48 and the cooling oil discharge port 50 are connected to the oil circulation path 38, and an oil pump 42 is provided in the oil circulation path 38. The cooling oil discharged from the oil pump 42 is supplied into the motor case 44 from the cooling oil supply port 48 and flows down in the motor case 44. In the motor case 44, the cooling oil flows down through a gap between the inner surface of the motor case 44 and the resin mold coil end 26. The cooling oil that has flowed down is sent from the cooling oil discharge port 50 to the oil circulation path 38, collected in the oil pan 40, and then sucked up by the oil pump 42. According to such a rotating electrical machine cooling system 32a, there is a possibility that the rotating electrical machine 28 can be cooled by cooling the coil end element 18 (see FIG. 5) even when the stator coil 16 (see FIG. 5) generates heat during operation. is there.

JP 2007-336677 A

  In the case of the motor generator described in Patent Document 1, since the protrusion is provided on the surface of the resin portion covering the stator coil, it is possible to increase the surface area of the resin portion and improve the cooling characteristics of the stator coil. Although the cooling oil does not flow in the inner peripheral portion of the stator coil relative to the end portion of the stator coil, cooling of the inner peripheral side of the coil end, which is the end portion of the stator coil, is insufficient. there is a possibility. For this reason, the temperature of the coil end on the inner peripheral side portion of the stator tends to be high, and there is room for improvement in terms of increasing the cooling performance of the motor generator. In particular, in recent years, it has been required to reduce the size of a rotating electrical machine in order to save space and reduce the weight of a rotating electrical machine installation portion in an apparatus such as a vehicle on which the rotating electrical machine is mounted. Since the portion of the coil through which a large current flows is increased in density, particularly efficient coil end cooling is required.

  On the other hand, it is conceivable to provide a flow path that guides the cooling oil supplied to the outer peripheral portion of the coil end to the inner peripheral side of the coil end, but in a portion outside the axial end of the coil end in the axial direction. When the flow path for guiding the cooling oil to the inner peripheral side of the coil end is arranged, the overall length of the stator in the axial direction is increased, which becomes a factor of increasing the size of the rotating electrical machine. Under such circumstances, it is desired to realize a structure that increases the cooling performance of the rotating electrical machine without increasing the size of the rotating electrical machine.

  An object of the present invention is to increase the cooling performance of a rotating electrical machine without increasing the size of the rotating electrical machine in a rotating electrical machine and a rotating electrical machine cooling system.

  The rotating electrical machine according to the present invention is a stator that faces the outer diameter side of the rotor, and is a plurality of portions that protrude in the axial direction from the axial end surface of the stator core in a stator coil provided at a plurality of circumferential positions of the stator. A stator including a resin-molded coil end composed of a coil end element and a resin embedding the plurality of coil end elements, and at least two coils adjacent to each other in the circumferential direction among the plurality of coil end elements A first coolant channel disposed between the end elements and communicating with the outer peripheral portion of the resin mold coil end and the inner peripheral portion of the resin mold coil end with respect to the plurality of coil end elements; It is the rotary electric machine characterized by this.

  According to the rotating electrical machine described above, when a coolant such as cooling oil is supplied from above the resin mold coil end to the outer peripheral portion of the stator facing the outer diameter side of the rotor, the coolant flows down due to the action of gravity. And since it reaches an inner peripheral side part rather than a plurality of coil end elements through the 1st refrigerant channel, the inner peripheral side of a stator coil can be cooled efficiently. For this reason, the cooling property of a rotary electric machine can be made high. Moreover, since the first refrigerant flow path is disposed between two coil end elements adjacent to each other in the circumferential direction among at least a plurality of coil end elements, the stator is provided by providing the first refrigerant flow path. Therefore, it is possible to prevent the rotating electric machine from becoming large.

  In the rotating electrical machine according to the present invention, preferably, the first refrigerant flow path is configured by a groove provided on an axial end surface of the resin molded coil end.

  In the rotating electrical machine according to the present invention, preferably, the resin-molded coil end is provided on the inner peripheral side with respect to the plurality of coil end elements and includes a second refrigerant flow passage in the axial direction that is recessed in the axial direction. The 1 refrigerant flow path makes the outer peripheral part of the resin mold coil end communicate with the second refrigerant flow path.

  According to the above rotating electric machine, the refrigerant supplied to the inner peripheral side of the plurality of coil end elements of the resin mold coil end can be caused to flow in the circumferential direction through the second refrigerant flow path through the first refrigerant flow path. The refrigerant can be prevented from entering the gap between the stator and the rotor. For this reason, the drag resistance of the rotating electrical machine caused by the refrigerant entering the gap between the stator and the rotor can be suppressed.

  In the rotating electrical machine according to the present invention, preferably, the resin-molded coil end is provided on the inner peripheral side with respect to the plurality of coil end elements, and has a flange portion protruding in the axial direction and an axial direction at a distal end portion of the flange portion. And an inclined portion provided so as to be inclined with respect to.

  According to the above rotating electric machine, the gap between the stator and the rotor is made to pass through the first refrigerant flow path, the refrigerant supplied to the inner peripheral side of the plurality of coil end elements of the resin mold coil end by the flange portion. Intrusion can be suppressed. For this reason, the drag resistance of the rotating electrical machine caused by the refrigerant entering the gap between the stator and the rotor can be suppressed.

  In the rotating electrical machine according to the present invention, preferably, the inclined portion is inclined in a direction toward the inner diameter side toward the tip.

  According to the above rotating electric machine, the refrigerant that has entered the space between the inner peripheral side and the flange portion of the resin-molded coil end through the first refrigerant flow path from the plurality of coil end elements tends to flow toward the inner diameter side. Even in this case, it is possible to prevent the refrigerant from entering the gap between the stator and the rotor by guiding the refrigerant outward in the axial direction by the inclined portion. For this reason, the drag resistance of the rotating electrical machine caused by the refrigerant entering the gap between the stator and the rotor can be more effectively suppressed.

  In the rotating electrical machine according to the present invention, preferably, the first refrigerant flow path is a flow path formed of a resin constituting the resin mold coil end.

  The rotating electrical machine cooling system according to the present invention includes the rotating electrical machine according to the present invention and supply means for supplying a refrigerant to the outer peripheral portion of the resin molded coil end.

  According to the rotating electrical machine and the rotating electrical machine cooling system according to the present invention, the cooling performance of the rotating electrical machine can be enhanced without increasing the size of the rotating electrical machine.

[First Embodiment]
Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram corresponding to the upper half of FIG. 9 in the rotating electrical machine of the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a view taken in the direction of arrow B in FIG.

  The rotating electrical machine 28 of the present embodiment is a motor that is also used as a generator for driving a hybrid vehicle or generating electric power, for example, and as shown in FIG. 1, a stator 52 that faces the outer diameter side of the rotor 36. And a plurality of first refrigerant passages 54 and a second refrigerant passage 56 which will be described later. The stator 52 includes a stator core 12 made of laminated steel plates and the like, and a pair of resin mold coil ends 26a provided on both sides in the axial direction. The stator core 12 is fixed inside a motor case 44 (see FIG. 10) that is made by die-casting metal such as aluminum. The rotating shaft 34 is rotatably supported by the motor case 44, and the stator 52 is radially opposed to the outer diameter side of the rotor 36 provided at the intermediate portion of the rotating shaft 34.

  Further, a plurality of permanent magnets (not shown) magnetized in the radial direction are provided at a plurality of locations in the circumferential direction of the rotor 36 and combined with the stator 52 to constitute a permanent magnet type motor, A rotor coil (not shown) is arranged at a plurality of locations in the circumferential direction and combined with the stator 52 to constitute an induction motor.

  The stator 52 is formed by winding a plurality of stator coils 58u, 58v, and 58w in a concentrated manner around teeth 14 (see FIG. 5) provided at a plurality of locations in the circumferential direction near the inner diameter of the stator core 12 made of laminated steel plates or the like. Yes. The rotating electrical machine 28 is, for example, a three-phase AC motor, and the stator coils 58u, 58v, and 58w are three-phase coils having different U-phase, V-phase, and W-phase, arranged in order in a plurality of locations in the circumferential direction of the stator 52. It is arranged so that it is repeated in the circumferential direction. Further, in the plurality of stator coils 58u, 58v, 58w provided at a plurality of locations in the circumferential direction of the stator 52, a plurality of coil end elements 60, which are portions protruding from both axial end surfaces of the stator core 12 to both axial sides, A pair of coil end main bodies 62 provided on both sides of the stator 52 are configured, and each coil end main body 62 is resin-molded to configure a pair of resin-molded coil ends 26a. That is, the pair of resin mold coil ends 26 a is configured by axial end portions of the stator coils 58 u, 58 v, 58 w configuring the stator 52, and a plurality of coil end elements 60 are provided at each end portion on both sides of the stator 52. Each coil end element 60 is composed of a resin 64 that embeds the coil end element 60. The resin 64 that embeds the coil end element 60 is, for example, an insulating resin having an insulating property such as an epoxy resin, BMC (bulk molding compound), or the like.

  In addition, a plurality of protrusions 66 having a substantially rectangular cross section are protruded in the axial direction at a plurality of positions in the circumferential direction corresponding to the arrangement positions of the respective coil end elements 60 on the outer end surface in the axial direction of each resin mold coil end 26a. It is provided in the state to do. At least a part of the coil end element 60 is disposed in each protrusion 66. In addition, a plurality of first refrigerant flow paths 54 are configured by a plurality of grooves formed between two protrusions 66 adjacent to each other in the circumferential direction of the stator 52. That is, a plurality of first refrigerant flow paths 54 are configured by groove portions that are provided at a plurality of locations in the circumferential direction of the axial end surface of the resin mold coil end 26a and are formed by the resin 64 that constitutes the resin mold coil end 26a. .

  Further, as shown in FIG. 2, in each resin mold coil end 26 a, the second refrigerant flow path 56, the collar portion 68, and the inner peripheral side are arranged in order from the outer peripheral side to the inner peripheral side. Provided. The second refrigerant flow path 56 is connected to the inner peripheral side end of each first refrigerant flow path 54 on the inner peripheral side of the plurality of protrusions 66 of each resin mold coil end 26a, and It is provided in a circular shape in the circumferential direction so as to be recessed in the axial direction. The depth in the axial direction (the left-right direction in FIG. 2) of the second refrigerant channel 56 is sufficiently larger than the depth of the first refrigerant channel 54. The flange portion 68 is a substantially cylindrical wall portion that constitutes the inner peripheral side portion of the second refrigerant channel 56, and is inclined toward the inner diameter side toward the distal end of the flange portion 68, An inclined portion 70 inclined with respect to the axial direction of the portion 68 is provided. Further, the axial length from the inner end in the axial direction of the resin mold coil end 26a to the tip edge of the inclined portion 70 is larger than the axial length from the inner end in the axial direction of the resin mold coil end 26a to the tip end surface of the protrusion 66. It is also bigger. In addition, the axial length L <b> 1 between the tip edges of the pair of inclined portions 70 is larger than the total axial length L <b> 2 of the rotor 36. Further, the inner diameter D1 of the tip edge of each inclined portion 70 is larger than the outer diameter D2 of the rotor 36. The second refrigerant flow path 56, the flange portion 68, and the plurality of coil end elements 60 are arranged concentrically with each other. Because of this configuration, the outer peripheral surface portion of the resin mold coil end 26a and the inner peripheral portion of the resin mold coil end 26a with respect to the plurality of coil end elements 60 are the outermost portions in the axial direction of the resin mold coil end 26a. The plurality of first refrigerant channels 54 communicate with each other without going through the outer end surface.

  The rotating electrical machine cooling system 32 of the present embodiment includes a pair of refrigerant supply means disposed above the outer peripheral portions of the pair of resin molded coil ends 26a for supplying the rotating electric machine 28 as described above and cooling oil that is a refrigerant. The refrigerant supply unit 30 is provided. The pair of refrigerant supply units 30 are, for example, a pair of nozzles or a pair of oil supply ports protruding downward from the inner peripheral surface of the upper end portion of the motor case 44 (see FIG. 10). The inside of the pair of refrigerant supply units 30 is connected to an oil flow path (not shown) provided outside the motor case 44 through a hole provided in the motor case 44. An oil pump 42 (see FIG. 10) and an oil reservoir (not shown) are provided on the upstream side of the oil passage. For example, when the oil pump 42 is provided, the cooling oil stored in the oil pan 40 (see FIG. 10) is sucked up by the oil pump 42 and flows through the oil flow paths toward the respective refrigerant supply units 30. In this case, a cooling oil discharge port 50 (see FIG. 10) is provided in the lower portion of the motor case 44, and the oil flow path that is connected to the cooling oil discharge port 50 is connected to the oil pan 40. That is, the oil flow path 40 constitutes an oil circulation path 38 (see FIG. 10).

  A heat exchanging part for exchanging heat between the cooling oil and the outside air is provided in the middle of the oil circulation path 38, or a cooling part such as a water jacket for exchanging heat between the cooling oil and the cooling water is provided. It can also be cooled. In addition, the oil pump 42 (see FIG. 10) is not provided in the rotating electrical machine cooling system 32, and the cooling oil is wound up and stored in an oil reservoir provided above the motor case 44 (see FIG. 10) by a rotating part such as a gear. You can also. In this case, the cooling oil is sent from the oil reservoir to the refrigerant supply unit 30 of the motor case 44 located below by the action of gravity. As the cooling oil, for example, an oil used for lubricating the transmission such as an automatic transmission fluid (ATF) can be used.

  In the case of such a rotating electrical machine cooling system 32, the cooling oil sent from the oil pump 42 and the oil storage unit to the pair of refrigerant supply units 30 is jetted downward from the respective refrigerant supply units 30, and each resin mold coil end 26a. Is supplied to the outer peripheral surface of the upper end portion. The cooling oil flows downward along the surface of the resin mold coil end 26a. At this time, as shown in FIG. 1 to FIG. 3, the cooling oil is diverted from the upper end portion of the resin mold coil end 26 a to the plurality of radial first refrigerant passages 54, while the second refrigerant passage in the circumferential direction. 56. The cooling oil supplied to the second refrigerant flow path 56 flows downward along the circumferential direction of the second refrigerant flow path 56 and is resin-molded through the first refrigerant flow path 54 and the like provided on the lower side of the stator 52. It flows down below the coil end 26a. As described above, while the cooling oil flows on the surface of the resin mold coil end 26a, the cooling oil exchanges heat with the resin mold coil end 26a to cool the resin mold coil end 26a. For this reason, the coil end element 60 (FIG. 1) inside the resin mold coil end 26a can be cooled, and the stator coils 58u, 58v, 58w (FIG. 1) can be cooled.

  In the illustrated example, a pair of refrigerant supply units 30 are provided, but only one refrigerant supply unit 30 may be provided. For example, the motor case 44 (see FIG. 10) located at the upper part of the outer diameter side of the axially intermediate portion of the stator core 12 is provided with a refrigerant supply port that is one refrigerant supply unit 30, and the inner peripheral surface of the upper end of the motor case 44 And an inner refrigerant flow path leading to both axial sides of the stator core 12 between the outer peripheral surface of the stator core 12 and the stator core 12 so that cooling oil can be supplied from both sides of the internal refrigerant flow path to above the pair of resin mold coil ends 26a. You can also

  The motor case 44 may be a case constituting a reduction gear device, a case integrated with a case constituting a differential gear device, or a single case common to a gear device.

  According to the rotating electrical machine and the rotating electrical machine cooling system of the present embodiment as described above, the stator 52 including the resin mold coil end 26a configured by the resin 64 embedding the plurality of coil end elements 60, and the plurality of coils. A first refrigerant channel 54 disposed between two end elements 60 that are adjacent to each other in the circumferential direction, and the first refrigerant channel 54 allows the outer periphery of the resin mold coil end 26a to The resin-molded coil end 26 a is in communication with the inner peripheral side portion of the plurality of coil end elements 60. For this reason, when cooling oil is supplied to the outer peripheral part from the upper side of the resin mold coil end 26a of the stator 52 facing the outer diameter side of the rotor 36, the cooling oil flows down due to the action of gravity. Since it reaches the inner peripheral side portion of the plurality of coil end elements 60 through the coolant channel 54, the inner peripheral side of the stator coils 58u, 58v, 58w can be efficiently cooled. For this reason, the cooling property of a rotary electric machine can be made high. Moreover, since the first refrigerant flow path 54 is arranged between two coil end elements 60 adjacent to each other in the circumferential direction among at least the plurality of coil end elements 60, the first refrigerant flow path 54 is provided. As a result, the axial length of the stator 52 can be prevented from increasing, and the rotating electrical machine 28 can be prevented from increasing in size.

  Further, the resin-molded coil end 26a is provided on the inner peripheral side with respect to the plurality of coil end elements 60, and includes a second coolant channel 56 in the circumferential direction that is recessed in the axial direction. The outer peripheral part of the mold coil end 26a and the second refrigerant channel 56 are communicated with each other. For this reason, the coolant supplied to the inner peripheral side of the plurality of coil end elements 60 of the resin mold coil end 26a through the first coolant channel 54 can be caused to flow in the circumferential direction by the second coolant channel 56, It is possible to prevent the refrigerant from entering the gap between the stator 52 and the rotor 36. For this reason, the drag resistance of the rotating electrical machine 28 caused by the refrigerant entering the gap between the stator 52 and the rotor 36 can be suppressed. On the other hand, in the case of the structure conventionally considered as shown in FIG. 8 above, unlike the present embodiment, the first refrigerant channel 54 and the second refrigerant channel 56 are not provided. It cannot be said that there is no possibility that the cooling oil supplied to the outer peripheral portion of the resin mold coil end 26 flows on the inner peripheral surface of the resin mold coil end 26 and enters the gap between the stator 24 and the rotor 36. When the cooling oil enters the gap, the stirring resistance of the cooling oil increases when the rotor 36 rotates, which causes the torque of the rotating electrical machine 28 to decrease. For this reason, in the case of the structure shown in FIG. 8, there is room for improvement in terms of achieving both reduction in torque of the rotating electrical machine 28 and improvement in cooling performance of the rotating electrical machine 28. In the case of the present embodiment, any of these inconveniences can be solved.

  Further, according to the present embodiment, the resin-molded coil end 26 a is provided on the inner peripheral side with respect to the plurality of coil end elements 60, and the flange portion 68 that protrudes in the axial direction and the shaft portion at the distal end portion of the flange portion 68 are provided. And an inclined portion 70 provided to be inclined with respect to the direction. For this reason, the cooling oil supplied to the inner peripheral side of the plurality of coil end elements 60 of the resin mold coil end 26a through the first refrigerant flow path 54 is passed between the stator 52 and the rotor 36 by the flange portion 68. It is possible to more effectively suppress entering the gap. For this reason, the drag resistance of the rotating electrical machine 28 caused by the cooling oil entering the gap between the stator 52 and the rotor 36 can be more effectively suppressed.

  Further, since the inclined portion 70 is inclined in the direction toward the inner diameter side as it goes to the tip, the inclined portion 70 passes through the first refrigerant flow path 54 and is located on the inner peripheral side of the plurality of coil end elements 60 of the resin mold coil end 26a. Even when the refrigerant that has entered between the flange portion 68 is about to flow to the inner diameter side, the cooling oil is guided by the inclined portion 70 so as to flow outward in the axial direction, and the gap between the stator 52 and the rotor 36. It is possible to more effectively suppress the refrigerant from entering the tank. For this reason, the drag resistance of the rotating electrical machine 28 caused by the refrigerant entering the gap between the stator 52 and the rotor 36 can be more effectively suppressed.

  Further, since the first refrigerant channel 54 is a channel formed by the resin 64 constituting the resin mold coil end 26 a, the first refrigerant channel 54 is configured by a resin such as a metal tube in order to configure the first refrigerant channel 54. There is no need to provide a member different from the portion, and the cost of the rotating electrical machine 28 can be prevented from rising excessively. In addition, as another embodiment different from the present embodiment, a portion in which at least one of the first refrigerant flow channel 54 and the second refrigerant flow channel 56 is formed of a resin constituting the resin mold coil end 26a is: It can also be constituted by another member. However, in this case, the cost is likely to be higher than in the case of the present embodiment.

  Moreover, although illustration is abbreviate | omitted, the 1st refrigerant | coolant flow path 54 should just provide at least 1 piece for every end surface of the axial direction one side of the resin mold coil end 26a. For example, when only one first coolant channel 54 is provided, the first coolant channel 54 in the vertical direction is provided on the axial end surface located at the upper end of the resin mold coil end 26a. Even in this case, the cooling oil supplied to the outer peripheral portion of the resin molded coil end 26a enters the second refrigerant flow channel 56 through the first refrigerant flow channel 54, thereby cooling the inner peripheral side portion of the resin molded coil end 26a. In addition, it is possible to suppress the cooling oil from entering the gap between the stator 52 and the rotor 36.

[Second Embodiment]
FIG. 4 is a schematic view showing a part of the circumferential direction of the axially outer end surface of the stator constituting the rotating electrical machine according to the second embodiment of the present invention extending in the left-right direction. In the present embodiment, the stator coils 58u, 58v, 58w are wound around the plurality of teeth 14 (see FIG. 5) constituting the stator 52a, and the stator coils 58u, 58v, 58w are wound around the teeth 14. The present invention is applied to a winding structure. When such distributed winding stator coils 58u, 58v, and 58w are provided, three-phase coils having different U-phase, V-phase, and W-phase are aligned in the radial direction of the stator 52 and shifted in the circumferential direction. Are arranged as follows.

  Further, in the plurality of stator coils 58u, 58v, and 58w provided at a plurality of locations in the circumferential direction of the stator 52a, the portions protrude from the both axial end surfaces of the stator core 12 (see FIGS. 1 to 3) to both axial sides. A plurality of coil end elements 60 constitutes a pair of coil end main bodies 62a provided on both sides of the stator 52a, and a pair of resin molded coil ends 26b are constituted by resin molding of each coil end main body 62a.

  In addition, a plurality of substantially rectangular cross-sections are provided at a plurality of locations in the circumferential direction divided into three locations in the radial direction corresponding to the arrangement positions of the respective coil end elements 60 on the axially outer end surfaces of the respective resin mold coil ends 26b. The protrusion 66 is provided in a state protruding in the axial direction. At least a part of the coil end element 60 is disposed in each protrusion 66. In addition, a plurality of radial grooves 72 formed between two protrusions 66 adjacent to each other in the circumferential direction of the stator 52a, and between the radially separated protrusions 66 communicating with each groove. The two circumferentially formed concentric circular second groove portions 74 constitute a first coolant channel 54a formed in a lattice shape. In addition, the first coolant channel 54a allows the resin mold coil end 26b to be connected to the outer peripheral surface portion and the second coolant channel 56 on the inner periphery side of the plurality of coil end elements 60 of the resin mold coil end 26b. The coil end 26b communicates without passing through the outermost end surface in the axial direction. The axial depths of the groove 72 and the second groove 74 are substantially the same.

In this embodiment, the stator 52a including the resin-molded coil end 26b formed of the resin 64 that embeds the plurality of coil end elements 60, and the plurality of coil end elements 60 that are adjacent to each other in the circumferential direction. 1st refrigerant flow path 54a arrange | positioned between each coil end element 60, The outer peripheral part of the resin mold coil end 26b, and the several coil of the resin mold coil end 26b by the 1st refrigerant flow path 54a The end element 60 communicates with the inner peripheral side portion. For this reason, when cooling oil is supplied to the outer peripheral portion from the upper side of the resin mold coil end 26b of the stator 52a facing the outer diameter side of the rotor 36 (see FIG. 1), the cooling oil is caused by the action of gravity. Since it flows down and reaches the inner peripheral side portion of the plurality of coil end elements 60 through the first refrigerant flow path 54a, the inner peripheral side of the stator coils 58u, 58v, 58w can be efficiently cooled. Since other configurations and operations are the same as those in the first embodiment, overlapping illustrations and descriptions are omitted.
In each of the above-described embodiments, the attachment portions 22 as shown in FIGS. 5 and 6 can be provided on the stators 52 and 52a.

[Reference Example for the Present Invention]
As a reference example related to the present invention, in the configuration in which the stator coil 16 is hardened by varnish impregnation as shown in FIG. 5 above, the portion of the stator coil 16 that protrudes from both axial end surfaces of the stator core 12 to both axial sides. A plurality of coil end elements 18 constitute a pair of coil ends 20 provided on both sides of the stator 10, and the coil end 20 is interposed between two coil end elements 18 adjacent to each other in the circumferential direction of the stator 10. It is also possible to arrange a radial refrigerant flow path, for example, a flow path pipe, which is a separate member. In this case, the outer peripheral surface portion of each coil end 20 and the portion on the inner diameter side of the plurality of coil end elements 18 in each coil end 20 are communicated with each other by the flow channel tube.

  As another reference example, in the configuration in which the stator coil 16 is hardened by impregnating the varnish as shown in FIG. 5 above, the portion of the stator coil 16 that protrudes from both axial end surfaces of the stator core 12 to both axial sides. A plurality of coil end elements 18 constitute a pair of coil ends 20 provided on both sides of the stator 10, and are coupled to the outer side surfaces of the tips of the plurality of teeth 14 at both axial end portions of the stator 10. A cylindrical flange such as a cylinder concentric with the stator 10 may be provided on the inner peripheral side of the stator 10 with respect to each coil end element 18. According to this configuration, by supplying a coolant such as cooling oil to the outer peripheral portion of the upper end portion of the coil end 20, even when the coolant flows and flows down on the surface of the coil end 20, the stator 10 and the rotor 36 are separated by the flange portion. It can suppress that a refrigerant | coolant enters into the clearance gap between (refer FIG. 1).

  Further, as another reference example, in the configuration in which the stator coil 16 is hardened by impregnating the varnish as shown in FIG. 5 described above, portions of the stator coil 16 that protrude from both axial end surfaces of the stator core 12 to both axial sides. A plurality of coil end elements 18 constitute a pair of coil ends 20 provided on both sides of the stator 10, and are coupled to the outer surfaces of the tip portions of the plurality of teeth 14 at both axial ends of the stator 10. A cylindrical flange such as a cylinder concentric with the stator 10 is provided on the inner peripheral side of the stator 10 with respect to each coil end element 18, and two coil end elements 18 adjacent to each other in the circumferential direction of the stator 10 are provided. In the meantime, a radial refrigerant flow path, for example, a flow path pipe, which is a member different from the coil end 20 can be arranged. In this case, the outer peripheral surface portion of each coil end 20 and the substantially annular shape formed on the inner diameter side of the plurality of coil end elements 18 and on the outer diameter side of the flange portion by the flow path tube. Communicate with the groove. Also in this configuration, by supplying a coolant such as cooling oil to the outer peripheral portion of the upper end portion of the coil end 20, the stator 10 and the rotor 36 ( It can suppress that a refrigerant | coolant enters into the clearance gap between FIG.

FIG. 10 is a diagram corresponding to the upper half of FIG. 9 in the rotating electric machine according to the first embodiment of the present invention. It is AA sectional drawing of FIG. It is a B arrow view of FIG. 1 which abbreviate | omits and shows a part. It is the schematic which extends the circumferential direction of the circumferential direction part of the axial direction outer end surface of the stator which comprises the rotary electric machine of 2nd Embodiment which concerns on this invention to the left-right direction. It is a schematic perspective view of the 1st example of the stator considered conventionally. It is a schematic perspective view of the 2nd example of the stator considered conventionally. FIG. 7 is a side view of FIG. 6. It is a schematic sectional drawing which shows the state which comprised the stator shown in FIG. 6 with the rotor, and comprised the rotary electric machine. It is the figure seen from the left-right direction one side of FIG. 8 to the other side. It is a figure which shows the partial cross section and oil circulation path of a rotary electric machine in one example of the rotary electric machine cooling system considered conventionally.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Stator, 12 Stator core, 14 Teeth, 16 Stator coil, 18 Coil end element, 20 Coil end, 22 Mounting part, 24 Stator, 26, 26a, 26b Resin mold coil end, 28 Rotating electric machine, 30 Refrigerant supply part, 32, 32a Rotating electrical machine cooling system, 34 Rotating shaft, 36 Rotor, 38 Oil circulation path, 40 Oil pan, 42 Oil pump, 44 Motor case, 46 Bearing, 48 Cooling oil supply port, 50 Cooling oil discharge port, 52, 52a Stator, 54, 54a First refrigerant flow path, 56 Second refrigerant flow path, 58u, 58v, 58w Stator coil, 60 coil end element, 62, 62a Coil end main body, 64 resin, 66 protrusion, 68 collar, 70 inclined section , 72 groove part, 74 2nd groove part.

Claims (7)

A stator facing the outer diameter side of the rotor,
In a stator coil provided at a plurality of locations in the circumferential direction of the stator, a plurality of coil end elements that are portions protruding in the axial direction from the axial end surface of the stator core;
A stator including a resin-molded coil end constituted by a resin embedding a plurality of coil end elements; and
Arranged between two coil end elements adjacent to each other in the circumferential direction among at least a plurality of coil end elements, the inner periphery of the outer periphery of the resin mold coil end and the plurality of coil end elements of the resin mold coil end. A rotating electrical machine comprising: a first refrigerant flow path communicating with a peripheral portion. In the rotating electrical machine according to claim 1,
The first refrigerant flow path is constituted by a groove provided on an axial end surface of a resin mold coil end. In the rotating electrical machine according to claim 1,
The resin-molded coil end is provided on the inner peripheral side with respect to the plurality of coil end elements, and includes a circumferential second coolant channel recessed in the axial direction.
The rotary electric machine characterized in that the first refrigerant flow path communicates the outer peripheral portion of the resin molded coil end and the second refrigerant flow path. In the rotating electrical machine according to claim 1,
The resin mold coil end is provided on the inner peripheral side with respect to the plurality of coil end elements, and a flange portion protruding in the axial direction;
A rotating electric machine comprising: an inclined portion provided at an end portion of the flange portion so as to be inclined with respect to the axial direction. In the rotating electrical machine according to claim 4,
The rotating electric machine is characterized in that the inclined portion is inclined in a direction toward the inner diameter side toward the tip. The rotating electrical machine according to any one of claims 1 to 5,
The rotary electric machine characterized in that the first refrigerant flow path is a flow path formed of a resin constituting a resin mold coil end. The rotating electrical machine according to any one of claims 1 to 6,
A rotating electrical machine cooling system comprising: a supply unit configured to supply a coolant to an outer peripheral portion of the resin mold coil end.

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