JP4946635B2 - Rotating electric machine cooling device - Google Patents

Description

  The present invention includes a rotor and a stator, and the stator includes a rotating electric machine having a resin-molded coil end formed by molding a coil end into a resin, and a refrigerant that supplies a refrigerant to the resin-molded coil end from above. A rotating electrical machine cooling device including a supply unit.

  Conventionally, it has been considered to cool a rotary electric machine including a rotor and a stator, for example, a vehicle electric motor, with a refrigerant, for example, cooling oil. For example, an oil supply port is provided in the motor case, and cooling oil circulating through the oil circulation path is supplied from the upper side of the coil end in the motor case through the oil supply port. The cooling oil flows down along the coil end due to natural fall and is sent to the oil circulation path through the oil discharge port provided in the motor case. The cooling oil is circulated through the oil circulation path by scooping up the cooling oil by a rotating part such as an oil pump or a gear provided in the middle of the oil circulation path. The cooling oil is cooled by a cooling unit provided in the oil circulation path. With such a configuration, the rotating electrical machine can be cooled.

  Patent Document 1 describes a coil end structure of a stator in a rotating electrical machine in which cooling oil grooves are formed in the circumferential direction of the outer peripheral surface of a stator coil end of an electric motor. In the housing, a cooling oil dropping portion for dropping cooling oil to the stator coil end is provided at a position above the stator coil end, and the cooling oil dropped from the cooling oil dropping portion is guided by the cooling oil groove, so that the stator coil end Is supposed to be cooled.

  Patent Document 2 describes a rotating electrical machine cooling device in which an outer circumferential oil passage groove having an arc cross-sectional shape is formed along the outer periphery of a coil end of the rotating electrical machine. The cooling device includes an oil supply port provided at an upper position of the side case fixed to the motor housing, and an oil dropping port communicating with the oil supply port, and oil dripped from the upper part of the coil end is formed in the outer oil passage groove. It is assumed that oil can be prevented from dripping from the coil end.

JP 2005-12961 A JP 2006-31750 A

  On the other hand, it has been conventionally considered that the stator constituting the rotating electrical machine is hardened by impregnating the coil end, which is a coil portion protruding in the axial direction from both axial end surfaces of the stator body. On the other hand, in recent years, in order to reduce the cost by automation at the time of manufacturing the rotating electrical machine, it has been considered to have a configuration having a resin-molded coil end formed by resin-molding the coil end.

  FIG. 10 is a perspective view of a stator 10 that is a stator that constitutes a motor generator that is a rotating electrical machine having a resin-molded coil end, which has been conventionally considered. The stator 10 is a stator body made of laminated steel plates or the like, and a coil is wound around a tooth provided near the inner diameter of the stator core 12 via a sheet portion of a non-magnetic material. A pair of resin-molded coil ends 14 are formed by resin-molding a pair of coil ends (not shown) protruding on both sides in the axial direction. Attachment portions 16 for fixing the stator 10 to the case of the motor generator are provided at a plurality of locations in the circumferential direction on the outer peripheral surface of the stator core 12. Further, a lead wire connecting protrusion 18 is formed on a part of the outer peripheral surface of one (front side in FIG. 10) of the resin molded coil ends 14, and the lead wire connecting protrusion 18 is formed. The lead-out wire (not shown) of the coil can be connected to an external circuit such as an inverter (not shown) through the inside.

  Thus, in the case of the motor generator having the resin mold coil end 14, the cooling oil adsorption force on the surface of the resin mold coil end 14 is smaller than the cooling oil adsorption force of the varnish portion when the coil end is hardened by varnish impregnation. As a result, the cooling oil tends to slide off from the surface of the resin mold coil end 14 quickly. That is, in the case of a motor generator having the resin molded coil end 14, the surface of the stator 10 becomes too smooth. For this reason, even if the cooling oil is supplied to the upper side of the stator 10, the temperature of the cooling oil does not rise. In particular, in the resin mold coil end 14 in which the coil end is covered with resin, There is a possibility that the temperature cannot be sufficiently lowered by the cooling oil flowing on the surface. That is, there is room for improvement in terms of improving the cooling performance of the motor generator by the cooling oil.

  On the other hand, in the case of the stator coil end structure in the rotating electrical machine described in Patent Document 1, a circumferential cooling oil groove is formed over the entire circumference of the stator coil end or at least in the upper half. Therefore, the cooling oil dripped from the upper side of the stator coil end and flowing into the cooling oil groove is not effectively retained or caught but flows along the cooling oil groove. For this reason, there is room for improvement in terms of increasing the contact time between the cooling oil and the stator coil end when the cooling oil flows down along the stator coil end and improving the cooling performance of the rotating electrical machine.

  Further, in the case of the cooling device for a rotating electrical machine described in Patent Document 2, an outer peripheral oil passage groove having an arc cross-sectional shape is formed along the outer periphery of the coil end, and the formation range of the outer peripheral oil passage groove is defined as a coil. It is set in the range of 90 ° on the left and right in the circumferential direction from the top of the end. For this reason, as in the case of the coil end structure of the stator in the rotating electrical machine described in Patent Document 1, the cooling when the cooling oil dropped or ejected from the upper part of the coil end flows down along the coil end. There is room for improvement in terms of increasing the contact time between the oil and the stator coil end and improving the cooling performance of the rotating electrical machine.

  An object of the present invention is to improve the cooling performance of a rotating electrical machine with a configuration having a resin-molded coil end formed by molding a coil end into resin in a rotating electrical machine cooling apparatus.

A rotating electrical machine cooling device according to the present invention includes a rotor and a stator, and the stator includes a rotating electrical machine having a resin-molded coil end formed by molding a coil end into a resin, and a resin-molded coil end. A cooling machine that includes a refrigerant supply unit that supplies a refrigerant from the upper side , and includes refrigerant induction axial protrusions provided at a plurality of locations on an axial side surface of the resin mold coil end. Of these teeth, it is a concentrated winding type that wraps coils of different phases between adjacent teeth, and the refrigerant induction axial protrusion constitutes a coil end and is a coil part protruding in the axial direction from the side surface of the stator body The rotating electrical machine cooling device is provided at a plurality of corresponding circumferential positions .

According to the rotating electrical machine cooling device according to the present invention, the cooling performance of the rotating electrical machine can be improved with the configuration having the resin-molded coil end formed by molding the coil end into resin. For example, according to the rotating electrical machine cooling device according to the first aspect of the present invention, the refrigerant induction axial protrusion is provided on the axial side surface of the resin mold coil end . For this reason, the contact time of the refrigerant that is supplied to the upper part of the resin mold coil end and flows downward along the surface such as the axial side surface of the resin mold coil end by the refrigerant induction axial protrusion contacts the resin mold coil end surface. Can be lengthened. That is, it by the coolant inducing axial projection, or can easily hook enable the refrigerant flowing down the resin mold coil end surfaces, easy to remain enabled refrigerant on the resin mold coil end surfaces. As a result, when the refrigerant flows down along the resin mold coil end, the contact time between the refrigerant and the resin mold coil end can be extended, the heat exchange performance between the refrigerant and the coil end can be improved, and the cooling performance of the rotating electrical machine Can be improved.

Moreover, the refrigerant induction axial projections are provided at a plurality of locations on the axial side surface of the resin mold coil end, and the stator is a concentrated winding type in which coils of different phases are wound between adjacent teeth among a plurality of teeth. There, the refrigerant induced axial projections constitute a coil end, since kick set circumferentially plurality of positions corresponding to the coil portion protruding from the side surface of the stator body in the axial direction, axial side of the coil end circle Despite being configured to protrude at a plurality of locations in the circumferential direction, it is possible to reduce the unevenness of the thickness of the resin that constitutes the resin mold coil end while improving the cooling performance of the rotating electrical machine. For this reason, the moldability of the resin mold coil end can be improved. For example, the unevenness of the thickness of the resin is increased, it can not be said that there is no possibility of breakage and cracks with a small portion of the thickness, but cause the yield of the rotary electric machine is deteriorated, the refrigerant induced axial butt The parts constitute the coil end and are provided at a plurality of circumferential positions corresponding to the coil portions protruding in the axial direction from the side surface of the stator main body portion. Therefore , the moldability of the resin mold coil end is eliminated. Can be improved. For this reason, the yield of the rotary electric machine having the concentrated winding type stator can be improved.

[First Reference Example ]
In the following, a description will be given of a first reference example regarding the present invention with reference to FIGS. FIG. 1 is a schematic cross-sectional view showing a motor generator 20 that is a rotating electrical machine that is cooled by the rotating electrical machine cooling device of the present reference example , and is an electric motor that also serves as a generator. FIG. 2 is a perspective view of a stator 22 that is a stator constituting the motor generator 20. FIG. 3 is a cross-sectional view taken along the line AA of FIG. In the following description, the reference example and the case where the rotating electrical machine of the present invention is a motor generator will be described, but the reference example and the present invention are not limited to such a configuration. For example, the reference example and the present invention can be applied to a configuration in which a rotating electrical machine is used exclusively for a generator or a motor.

The motor generator 20 that is cooled by the electric motor cooling device of this reference example is used to drive a hybrid vehicle or generate electric power, for example, and as shown in FIG. The bearing 28 is rotatably supported. In addition, a rotor 30 is provided at an intermediate portion of the rotating shaft 26. Further, the stator 22 is fixed to the case 24 so as to face the outer peripheral surface of the rotor 30 in the radial direction. Moreover, the stator 22 has the stator core 12 which is a stator main body, and a pair of resin mold coil end 14a provided in the both sides.

  That is, as shown in detail in FIGS. 2 and 3, the stator 22 is made of non-magnetic material on teeth 32 (FIG. 3) 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. A coil 34 (FIG. 3) is wound through the sheet portion, and a pair of coil ends 36 projecting from both axial end surfaces of the stator core 12 to both axial sides are resin-molded. 14a. Mounting portions 16 (FIG. 2) for fixing the stator 22 to the case 24 (FIG. 1) of the motor generator 20 (FIG. 1) are provided at a plurality of positions in the circumferential direction on the outer peripheral surface of the stator core 12. The stator 22 can be fixedly coupled to the case 24 by screwing a screw (not shown) inserted into a hole provided in the mounting portion 16 into a screw hole or a nut (not shown) provided in the case 24. . The stator 22 is of a concentrated winding type in which coils 34 of different phases are wound around adjacent teeth 32 among the plurality of teeth 32.

  Further, a lead wire connecting projection 18 is formed on a part of the outer peripheral surface of one (front side in FIG. 2) of the resin molded coil ends 14a of the pair of resin mold coil ends 14a. A coil lead-out wire (not shown) taken out through the inside of the coil or a conductor (not shown) connected to the lead-out wire is connected to an external circuit such as an inverter (not shown) and an electric wire (not shown). Connectable.

  In addition, an annular protrusion 38 that is a refrigerant induction axial protrusion is provided in a state of protruding in the axial direction at a portion extending from the radially intermediate portion to the outer peripheral edge of the axially outer surface of each resin mold coil end 14a. ing.

Returning to FIG. 1, the case 24 is provided with a pair of cooling oil dropping portions 40 that supply cooling oil that is a coolant from above the pair of resin mold coil ends 14 a. The pair of cooling oil dripping portions 40 is constituted by a nozzle or the like, and can supply cooling oil through an oil circulation path (not shown). The cooling oil dropping unit 40 can also spray or eject the cooling oil in addition to dropping the cooling oil. The cooling oil supplied to the upper part of the resin mold coil end 14a from the upper side of the resin mold coil end 14a by the cooling oil dripping unit 40 flows downward along the surface of the resin mold coil end 14a, and flows below the case 24. Accumulate. A pair of cooling oil discharge ports 42 are provided in the lower portion of the case 24 so that the cooling oil is returned to the oil circulation path through the cooling oil discharge ports 42. The cooling oil circulates in the oil circulation path by scooping up an oil pump (not shown) or a rotating part (not shown) such as a gear provided in the middle of the oil circulation path. In addition, the cooling oil in the oil circulation path can be cooled by passing a part of the oil circulation path through a cooling unit (not shown) such as a water jacket for exchanging heat with the cooling water or the like. The resin mold coil end 14a is cooled by the cooling oil flowing down the surface. The rotating electrical machine cooling apparatus of the present reference example includes a motor generator 20, a cooling oil dropping unit 40, and an oil circulation path.

  The case 24 for fixing the stator 22 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.

  A method of cooling the motor generator 20 that has generated heat with energization of the coil 34 of the motor generator 20 by such a rotating electrical machine cooling device will be described. In the motor generator 20, when the coil 34 is energized to drive the rotary shaft 26, the coil end 36 generates heat, and the resin molded coil end 14a also generates heat. When the cooling oil is supplied to the resin mold coil end 14a from above by the cooling oil dropping unit 40, that is, when the cooling oil is dropped, the resin mold coil end 14a is cooled by the cooling oil.

According to the rotating electrical machine cooling apparatus of this reference example , the cooling performance of the motor generator 20 can be improved with the configuration having the resin-molded coil end 14a configured by molding the coil end 36 into resin. That is, since the annular protrusion 38 is provided on the side surface in the axial direction of the resin mold coil end 14a, the annular protrusion 38 is supplied to the upper portion of the resin mold coil end 14a and along the axial side surface of the resin mold coil end 14a. Thus, the contact time of the cooling oil flowing downward and contacting the surface of the resin mold coil end 14a can be lengthened. In other words, the annular protrusion 38 makes it easy to effectively catch the cooling oil flowing down the surface of the resin mold coil end 14a, and makes it easy to effectively keep the cooling oil on the surface of the resin mold coil end 14a. As a result, when the cooling oil flows down along the resin mold coil end 14a, the contact time between the cooling oil and the resin mold coil end 14a can be increased, and the heat exchange performance between the cooling oil and the coil end 36 can be improved. The cooling performance of the motor generator 20 can be improved. Further, unlike the case where the coil end 36 is impregnated with the varnish, the resin mold of the coil end 36 facilitates full automation when the motor generator 20 is manufactured. For this reason, it becomes easy to achieve cost reduction. In addition, in this reference example, it is possible to easily ensure a cooling performance equal to or higher than that when the coil end 36 is impregnated with varnish.

On the other hand, there is no axial protrusion on the axial side surface of the resin-molded coil end 14 as in the conventional motor generator stator 10 shown in FIG. When there is no protrusion other than the lead wire connecting protrusion 18, when the cooling oil is supplied from above the stator 10, the cooling oil flowing down along the axial side surface of the resin mold coil end 14 is axially It tends to slide down quickly due to gravity without being caught or staying on the side. For this reason, the contact time between the cooling oil and the resin mold coil end 14 is shortened, and there is room for improvement in terms of improving the cooling performance of the motor generator 20. On the other hand, according to the present reference example , such inconvenience can be eliminated and the cooling performance of the motor generator 20 can be improved.

[Embodiments of the present invention ]
FIG. 4 is a perspective view showing a stator 22a constituting a motor generator that is a rotating electrical machine that is cooled by the rotating electrical machine cooling apparatus according to the embodiment of the present invention. FIG. 5 is a schematic diagram showing a state in which cooling oil drops on the axial side surface of the resin molded coil end 14b of the stator 22a. In the present embodiment, on the axially outer side surface of each resin mold coil end 14b, axial projections that are refrigerant induction axial projections are provided at a plurality of circumferential positions in a portion extending from the radial intermediate portion to the outer peripheral edge portion. 44 is provided. The axial protrusion 44 is integrally formed by a resin portion constituting the resin mold coil end 14a when the resin mold coil end 14b is formed. In particular, in the present embodiment, the coil end 36 (see FIG. 3) is configured, and the resin mold coil end 14a corresponding to the coil 34 (see FIG. 3) portion protruding in the axial direction from the axial side surface of the stator core 12 is formed. Axial protrusions 44 are provided at a plurality of locations in the circumferential direction.

  According to the rotating electrical machine cooling apparatus of this embodiment, since the axial protrusions 44 are provided at a plurality of circumferential positions on the axial side surface of the resin mold coil end 14b, the axial protrusions 44 The contact time of the cooling oil supplied to the upper part of the resin mold coil end 14b and flowing downward along the side surface in the axial direction of the resin mold coil end 14b with respect to the surface of the resin mold coil end 14b can be increased. That is, when the cooling oil is supplied to the resin mold coil end 14b from above by the cooling oil dropping unit 40 (see FIG. 1), that is, dripping, the cooling oil flowing on one side surface in the axial direction of the resin mold coil end 14b is As indicated by the arrows, it flows a lot in parts other than the axial protrusion 44. That is, the cooling oil flows down so as to flow in a large amount between the axial projections 44 while the flow direction is changed by the axial projections 44. As described above, the axial protrusion 44 makes it easy to effectively catch the cooling oil flowing down the surface of the resin mold coil end 14b, and makes it easy to effectively keep the refrigerant on the surface of the resin mold coil end 14b. Therefore, the contact time of the cooling oil supplied to the upper part of the resin mold coil end 14b by the axial protrusion 44 and flowing downward along the axial side surface of the resin mold coil end 14b is in contact with the surface of the resin mold coil end 14b. The cooling performance of the motor generator 20 can be improved by increasing the heat exchange performance between the cooling oil and the coil end.

  Further, the axial projections 44 are provided at a plurality of locations on the axial side surface of the resin mold coil end 14b, and the stator 22 has a phase that is different between adjacent teeth 32 among the plurality of teeth 32 (see FIG. 3). It is a concentrated winding type for winding the coil 34 (see FIG. 3), constitutes a coil end 36, and has axial protrusions 44 at a plurality of circumferential positions corresponding to the coil 34 portions protruding in the axial direction from the side surface of the stator core 12. Provided. Therefore, the thickness of the resin constituting the resin mold coil end 14b is improved while improving the cooling performance of the motor generator, despite the fact that the axial side surface of the coil end 36 protrudes at a plurality of locations in the circumferential direction. Non-uniformity can be reduced. For this reason, the moldability of the resin mold coil end 14b can be improved. For example, if the unevenness of the resin thickness increases, it cannot be said that there is no possibility of cracks or cracks occurring in the small thickness part, which causes the yield of the motor generator to deteriorate. Accordingly, such inconvenience can be eliminated and the moldability of the resin mold coil end 14b can be improved. For this reason, the yield of the motor generator having the concentrated winding type stator 22 can be improved.

In the present embodiment, the shape of the axial protrusion 44 provided on the side surface in the axial direction of the resin mold coil end 14b is not limited to the shape shown in the figure, and may be various shapes .

[ Second Reference Example ]
Figure 6 is cooled by the rotating electrical machine cooling apparatus of a second reference example concerning the present invention, a rotating electric machine, a stator 22b that constitute the motor-generator, it is schematically when viewed from the axial direction one side to the other side . An annular groove 46, which is a refrigerant entrance hole, is provided concentrically with the circular shape of the axial side surface at the radial intermediate portion of the axial side surface of the resin mold coil end 14c provided on both axial sides of the stator 22b. In the case of such a rotating electrical machine cooling apparatus of this reference example, the stator 22b having the resin mold coil end 14c provided with the annular groove 46 on the side surface in the axial direction is provided. Therefore, the stator 22b is supplied to the upper part of the resin mold coil end 14c. The contact time of the cooling oil flowing downward along the axial side surface of the coil end 14 c and contacting the surface of the resin mold coil end 14 c can be increased by the annular groove 46. In other words, the annular groove 46 can make it easier for the cooling oil flowing down the surface of the resin mold coil end 14c to effectively remain on the surface of the resin mold coil end 14c. As a result, when the cooling oil flows down along the resin mold coil end 14c, the contact time between the cooling oil and the resin mold coil end 14c can be increased, and the heat exchange performance between the cooling oil and the coil end can be improved. The cooling performance of the motor generator can be improved. Since other configurations and operations are the same as those of the first reference example shown in FIGS. 1 to 3 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

  In addition, the annular groove part 46 can also provide two or more regarding the radial direction in each resin mold coil end 14c. Further, instead of the annular groove 46, one or more grooves such as a radial direction can be provided on the side surface in the axial direction of the resin mold coil end 14c.

[ Third Reference Example ]
Figure 7 is cooled by the rotating electrical machine cooling apparatus of the third reference example concerning the present invention, a rotating electric machine, a stator 22c constituting the motor-generator, it is schematically when viewed from the axial direction one side to the other side . A plurality of scattered minute holes 48 that are refrigerant entrance holes are provided on the side surfaces in the axial direction of the resin mold coil ends 14d provided on both sides in the axial direction of the stator 22c. In the case of the rotating electrical machine cooling apparatus of this reference example, the surface of the resin mold coil end 14d of the cooling oil supplied to the upper part of the resin mold coil end 14d and flowing downward along the axial side surface of the resin mold coil end 14d. The contact time in contact with can be made longer by the plurality of dot-like micropores 48. In other words, the cooling oil flowing down the surface of the resin mold coil end 14d can be easily retained effectively on the surface of the resin mold coil end 14d by the plurality of scattered minute holes 48. As a result, when the cooling oil flows down along the resin mold coil end 14d, the contact time between the cooling oil and the resin mold coil end 14d can be increased. Since other configurations and operations are the same as those of the first reference example shown in FIGS. 1 to 3 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

[ Fourth Reference Example ]
Figure 8 is cooled by the rotating electrical machine cooling apparatus of the fourth reference example concerning the present invention, a rotating electrical machine, the stator 22d constituting the motor-generator, it is schematically when viewed from the axial direction one side to the other side . In this reference example , the radial protrusions having a substantially triangular cross section that are refrigerant induction radial protrusions at a plurality of circumferential positions on the upper half of the outer peripheral surface of the resin mold coil end 14e provided on both axial sides of the stator 22d. 50 is provided. In the case of the rotating electrical machine cooling apparatus of this reference example , the cooling oil supplied to the upper part of the resin mold coil end 14e and flowing downward along the surface of the resin mold coil end 14e contacts the surface of the resin mold coil end 14e. The contact time can be increased by the plurality of radial protrusions 50. That is, the plurality of radial protrusions 50 can easily catch the cooling oil flowing down the outer peripheral surface of the resin mold coil end 14e, and can easily keep the cooling oil effectively on the outer peripheral surface of the resin mold coil end 14e. As a result, when the cooling oil flows down along the resin mold coil end 14e, the contact time between the cooling oil and the resin mold coil end 14e can be increased. Since other configurations and operations are the same as those of the first reference example shown in FIGS. 1 to 3 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

In addition, the shape of the radial protrusion 50 provided on the outer peripheral surface of the resin mold coil end 14e is not limited to the shape shown in the figure, and may be various shapes. A plurality of radial protrusions 50 may be provided in the axial direction on the outer peripheral surface of the resin mold coil end 14e. Further, the radial protrusion 50 can be provided not only on the upper half of the outer peripheral surface of the resin molded coil end 14b but also on the lower half. Further, in the present reference example, as in the embodiments and reference examples in the above embodiment, the annular projection 38, axially projecting portion 44, annular groove 46, it can also be combined with the provided structure micropores 48.

[ Fifth Reference Example ]
Figure 9 is cooled by the rotating electrical machine cooling apparatus of the fifth reference example concerning the present invention, a rotating electric machine is a perspective view of a stator 22e constituting the motor-generator. In the present reference example , a plurality of scattered minute holes 52 are provided on the outer peripheral surface of the resin mold coil end 14f provided on both axial sides of the stator 22e. In FIG. 9, only the outer peripheral surface of the resin molded coil end 14f on one side of the outer peripheral surfaces of the pair of resin molded coil ends 14f is shown. In the case of such a rotating electrical machine cooling apparatus of the present embodiment, the cooling oil that is supplied to the upper portion of the resin mold coil end 14f and flows downward along the surface of the resin mold coil end 14f is formed on the surface of the resin mold coil end 14f. The contact time in contact with each other can be lengthened by the plurality of scattered dot-shaped micropores 52. That is, the cooling oil flowing down the surface of the resin mold coil end 14f can be effectively retained on the outer peripheral surface of the resin mold coil end 14f by the plurality of scattered minute holes 52. As a result, when the cooling oil flows down along the resin mold coil end 14f, the contact time between the cooling oil and the resin mold coil end 14f can be increased. Since other configurations and operations are the same as those of the first reference example shown in FIGS. 1 to 3 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted. The micro holes 52 on the plurality of scattered points can be provided only in the upper half of the outer peripheral surface of the resin mold coil end 14f. Further, in this reference example , as in the first to third reference examples and the embodiments shown in FIGS. 1 to 7, the annular protrusion 38, the axial protrusion 44, the annular groove 46, the minute hole It can be combined with the structure provided with the portion 48.

In the above embodiment and each reference example, although the refrigerant and the cooling oil, the present invention is not limited to the case of using such a cooling oil, as possible out also for example the refrigerant and the cooling water .

The rotating electrical machine cooling apparatus of the first reference example regarding the present invention is a schematic sectional view showing the motor generator to cool. In a 1st reference example , it is a perspective view of a stator which constitutes a motor generator. It is AA sectional drawing of FIG. It is a perspective view showing a stator constituting the motor generator to cool the rotary electric machine cooling system of the embodiment according to the present invention. It is a schematic diagram showing a state where cooling oil drops on the side surface in the axial direction of the resin mold coil end of the stator. A stator composing the motor generator to cool the rotary electric machine cooling system of the second reference example concerning the present invention, is a schematic illustration when viewed from the axial direction one side to the other side. A stator composing the motor generator to cool the rotary electric machine cooling system of the third reference example concerning the present invention, is a schematic illustration when viewed from the axial direction one side to the other side. A stator composing the motor generator to cool the rotary electric machine cooling system of the fourth reference example concerning the present invention, is a schematic illustration when viewed from the axial direction one side to the other side. The rotating electrical machine cooling apparatus of the fifth reference example regarding the present invention is a perspective view showing a stator constituting the motor generator to cool. It is a perspective view which shows the stator which comprises the motor generator considered conventionally.

DESCRIPTION OF SYMBOLS 10 Stator, 12 Stator core, 14, 14a, 14b, 14c, 14d, 14e, 14f Resin mold coil end, 16 mounting part, 18 Lead wire connection protrusion, 20 Motor generator, 22, 22a, 22b, 22c, 22d, 22e Stator, 24 Case, 26 Rotating shaft, 28 Bearing, 30 Rotor, 32 Teeth, 34 Coil, 36 Coil end, 38 Annular projection, 40 Cooling oil dripping portion, 42 Cooling oil discharge port, 44 Axial projection, 46 Annular groove, 48 micropores, 50 radial projections, 52 micropores.

Claims (1)

A rotating electric machine having a rotor and a stator, the stator having a resin mold coil end configured by molding the coil end into resin;
A cooling machine cooling device comprising a coolant supply unit that supplies a coolant to the resin mold coil end from above,
Refrigerant induction axial protrusions provided at a plurality of locations on the axial side surface of the resin mold coil end ,
The stator is a concentrated winding type in which coils of different phases are wound between adjacent teeth among a plurality of teeth.
The refrigerant induction axial projection includes a coil end, and is provided at a plurality of locations in the circumferential direction corresponding to coil portions protruding in the axial direction from the side surface of the stator body .

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