JP2019088057A - Cooling structure of rotating electric machine - Google Patents

Abstract

To provide a refrigeration structure of dynamo-electric machine capable of cooling even a stator coil, at a position separated from a cooling liquid supply pipe, effectively by supplying the cooling liquid properly.SOLUTION: The cooling structure of a dynamo-electric machine including a rotatable rotor 91, and a stator 94 includes a cooling liquid supply pipe 11 extending in the revolving shaft m direction of the rotor, and having a discharge hole 13 discharging the cooling liquid to the stator coil 93. A guide member 12 is integrated with the cooling liquid supply pipe 11. The guide member 12 extends in the hoop direction of the dynamo-electric machine, in the vicinity 12a of connection with the cooling liquid supply pipe, and bends or curves in the direction toward the stator coil 93 across the end 12b in the hoop direction. At least a part of the discharge hole 13 is provided so that the cooling liquid is discharged in the hoop direction of the dynamo-electric machine, and the cooling liquid discharged from the discharge hole 13 flows along the surface of the guide member 12 and is guided to the stator coil.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cooling structure of a rotating electrical machine. In particular, the present invention relates to a liquid-cooled rotary electric machine cooling structure that cools a stator coil with a coolant.

Rotating electrical machines are used in a variety of applications, including electric vehicles and hybrid vehicles. The rotating electrical machine is also called a motor generator or the like, and can operate as a motor that converts electric power to motive power or as a generator that converts motive power (rotational force) to electric power. As a structure of a rotary electric machine, a structure constituted by a rotor provided with a permanent magnet and rotatably provided and a stator provided so as to surround the rotor is general. The interaction between the stator coils provided in the stator and the permanent magnets provides mutual conversion of power and power.

The stator coil generates heat when current flows, so cooling is performed. In a rotating electrical machine used for an automobile or the like, a technology has been developed in which oil or the like is poured over a stator coil to flow and cool the coil.
For example, in Patent Document 1, in a cooling structure of a motor, a plurality of ejection holes are provided in a pipe member through which a cooling liquid flows, and the ejection holes are longer in the distance until the ejected liquid reaches the coil end. There is disclosed a technique of arranging so as to be closer to the supply source of the coolant than the spouting holes in which the d. According to the related art, the range in which the refrigerant in the coil end is applied can be expanded, and the coil end can be efficiently cooled.

Further, in Patent Document 2, while providing a discharge hole in the upper portion of the oil pipe, a technique of providing a pair of guide ribs in the case of the rotary electric machine and guiding oil discharged from the upper discharge hole to the upper side of the coil by the guide rib Is disclosed. According to this technique, pressure adjustment of the coolant can be easily performed, and the cooling performance of the rotating electrical machine can be improved.

JP, 2016-134972, A Unexamined-Japanese-Patent No. 2011-193642

With the increasing output of rotating electric machines, it has been required to further improve the cooling performance, but in the prior art as well, it has become desirable to more effectively cool the coil by the cooling liquid. The In particular, it has become desirable to supply the coolant accurately to the coil located away from the coolant piping.

It is an object of the present invention to provide a cooling fluid appropriately supplied to a stator coil disposed at a position spaced apart from a cooling fluid supply pipe in the circumferential direction of the rotating electrical machine, thereby effectively performing cooling. It is in providing a cooling structure.

As a result of intensive investigations, the inventor integrates a guide member for guiding the discharged coolant into the coolant supply pipe, and discharges the coolant in the circumferential direction of the rotary electric machine to apply the coolant to the surface of the guide member. The inventors have found that the above problems can be solved by flowing along and changing the direction of the flow of the coolant by utilizing the curvature or bending of the guide member, and the present invention has been completed.

The present invention is a cooling of a rotating electrical machine including a rotor rotatable about an axis, a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor, and a stator coil wound around the stator core. A coolant having a structure extending in the axial direction of the rotor and having a pipe through which the coolant flows and at least one discharge hole for discharging the coolant to the stator coil. And a guide member integrated with the coolant supply pipe, the guide member extending along the circumferential direction of the rotary electric machine near the connection portion with the coolant supply pipe, It is bent or curved in the direction toward the stator coil to the end of the direction, and at least a part of the discharge hole is in the direction along the circumferential direction of the rotary electric machine as viewed along the axial direction Provided that 却液 is discharged, coolant discharged from the discharge hole is flowing along the surface of the guide member guided in the stator coil, a cooling structure of a rotating electric machine (first invention).

In the first invention, preferably, a groove is formed in the guide member, and the coolant discharged from the discharge hole flows along the groove and is led to the stator coil (second invention). Furthermore, in the second invention, preferably, the axial position of the groove at the circumferential end of the guide member is different from the axial position of the discharge hole for discharging the coolant to the groove ( 3rd invention). Furthermore, in the second invention, preferably, at least the circumferential end of the guide member is formed in a corrugated plate shape (fourth invention). Furthermore, in the second invention, preferably, a plurality of ribs are provided upright on the guide member, and the space between the ribs is the groove (the fifth invention).

In the first aspect of the invention, preferably, the coolant is discharged from the discharge hole in a direction inclined with respect to the circumferential direction as viewed along the radial direction of the rotating electrical machine, and the coolant is guided by the guide member ( Sixth invention).

According to the cooling structure (first invention) of the rotating electrical machine of the present invention, the cooling fluid can be accurately supplied also to the stator coil disposed at a position separated in the circumferential direction of the rotating electrical machine from the cooling fluid supply pipe, It can cool effectively.

Further, if the second invention, the third invention, the fourth invention and the fifth invention are used, it is possible to concentrate the flow of the coolant on a predetermined portion of the coil at a position distant in the circumferential direction. Yes, cooling is more efficient. In addition, if it is done as in the third invention and the sixth invention, design freedom such as the position where the coolant discharge hole is provided and the length of the coolant supply pipe is increased, and the cooling structure of the rotating electrical machine is more effective. Can be realized efficiently.

It is a sectional view showing an embodiment of cooling structure of rotation electrical machinery concerning the present invention. It is a perspective view which shows 1st Embodiment of the cooling fluid supply pipe with which the guide member was integrated. It is a sectional view showing a 1st embodiment of a cooling fluid feed pipe with which a guide member was integrated. It is a cross-sectional schematic diagram which shows a mode that the discharged | emitted cooling fluid is guide | induced to a stator coil by 1st Embodiment of the cooling fluid supply pipe with which the guide member was integrated. FIG. 6 is a perspective view showing how the discharged coolant is led by the first embodiment of the coolant supply pipe in which the guide member is integrated. It is a perspective view which shows 2nd Embodiment of the cooling fluid supply pipe with which the guide member was integrated. It is a perspective view which shows 3rd Embodiment of the cooling fluid supply pipe with which the guide member was integrated. It is a figure which shows 4th Embodiment of the cooling fluid supply pipe with which the guide member was integrated.

Hereinafter, embodiments of the invention will be described by taking a rotating electrical machine (motor generator) used in a hybrid vehicle as an example with reference to the drawings. The invention is not limited to the specific embodiments described below, but may be modified in form.

FIG. 1 is a cross-sectional view showing an embodiment of a cooling structure of a rotating electrical machine according to the present invention. The rotary electric machine includes a rotatable rotor 91 and a stator 94 disposed around the rotor. When this rotary electric machine is used in a car, the rotary shaft of the rotor is connected to a drive mechanism such as a transmission of the car, and the rotary electric power is generated as a motor (motor) that generates a driving force by electric power. It is configured to operate as a generator to convert.

A permanent magnet is attached to the rotor 91, and is supported by a case (not shown) of the rotary electric machine so as to be rotatable around the rotation axis m. The rotary electric machine may be of a type that does not use a permanent magnet for the rotor 91.

The stator 94 includes a plurality of stator cores 92, 92 arranged side by side on the rotor outer peripheral portion so as to surround the outer periphery of the rotor 91, and stator coils wound around the respective stator cores 92, 92 (hereinafter also referred to simply as "coils") And 93). The stator 94 is fixed inside the case of the rotating electrical machine. In the stator 94, the coils are exposed at both ends of the rotation axis m, and this portion is called a coil end.

Inside the case, a coolant supply pipe 11 is preferably provided so as to pass between the case and the stator 94. The coolant supply pipe 11 is provided to extend substantially parallel to the rotation axis m of the rotor. The cooling liquid supply pipe 11 is a pipe provided with a pipe line through which the cooling liquid flows. The coolant supply pipe 11 has at least one or more discharge holes for discharging the coolant to the stator coil 93.

The coolant supply pipe 11 is integrated with the guide member 12 as described later, and as shown in the YY cross section of FIG. 1, the posture such that the guide member 12 extends in the circumferential direction of the rotary electric machine in general. Then, the coolant supply pipe 11 and the guide member 12 are attached. The number and arrangement of the cooling liquid supply pipes 11 are not particularly limited, but it is preferable that the cooling liquid supply pipe 11 be disposed facing the upper side, the obliquely upper side, and the lateral side of the coil 93 so that the discharged cooling liquid flows by gravity and cools the coil. .

The coolant is recovered and pressurized by a pump or the like, and supplied to the coolant supply pipe 11 through a pipe or the like provided in the case. The coolant discharged from the discharge holes 13 and 14 of the coolant supply pipe 11 is applied to the coil end, and the coil is cooled as it flows downward along the coil. The discharged coolant is collected at the lower part of the case and circulated to cool the coil. The coolant is typically an oil. It is preferable that an oil cooler or the like for cooling the coolant be provided in the circulation path of the coolant.

As shown in the X-X cross section of FIG. 1, the stator coil 93 is exposed on both sides of the rotation axis m with respect to the stator core 92, and this portion is illustrated as coil ends 93a and 93b. The coolant discharged from the coolant supply pipe 11 is typically applied to the coil ends 93a and 93b to mainly cool this portion. A discharge hole may be provided in the cooling fluid supply pipe also in the middle portion of the coil ends 93a and 93b on both sides, that is, the portion of the stator core 92, and this portion may also be cooled by the cooling fluid.

Although not essential, the coolant supply pipe 11 may be divided in the axial direction. For example, a portion for supplying the cooling fluid to the coil end 93a located on one end side of the rotation shaft and a portion for supplying the cooling fluid to the coil end 93b located on the other end side of the rotation shaft are separately provided. It may be connected to form a series of pipes. Further, in the coolant supply pipe 11, the end opposite to the side to which the coolant is supplied is preferably closed as in the present embodiment, but this is not essential, and other pipes are not required. It may be connected to a road or the like.

In the cooling structure of the rotating electrical machine according to the present invention, in addition to the cooling liquid supply pipe 11, a guide member 12 is provided. As shown in FIGS. 2 and 3, the guide member 12 is integrated with the cooling liquid supply pipe 11, and becomes a cooling liquid supply member 1 having a form in which a plate member is integrated with the pipe body. , Equipped with cooling structure. It is preferable that the guide member 12 and the cooling liquid supply pipe 11 be integrated by integral molding using injection molding of resin.

The form of the guide member 12 will be described. The guide member 12 extends along the circumferential direction of the rotary electric machine near the connection portion 12a with the cooling fluid supply pipe 11, and extends toward the end 12b of the guide member 12 in the circumferential direction of the rotary electric machine toward the stator coil 93 It is bent or curved in the direction. In the present embodiment, in the vicinity of the connection portion 12a with the coolant supply pipe 11, the guide member is provided in a flat plate shape extending in the circumferential direction of the rotary electric machine, and the circumferential end 12b of the guide member 12 is It is formed to be curved toward the center of the rotating electrical machine, that is, the direction in which the coil and the rotor are present. Although not essential, the circumferential end 12b of the guide member 12 is preferably provided so as to extend substantially along the radial direction of the rotary electric machine at its end.

Although not essential, in order to facilitate arrangement in a narrow space, the guide member 12 is preferably provided in a plate shape. The guide member may be in the form of a hollow box. Further, it is preferable that the guide members be provided on both sides of the cooling liquid supply pipe 11, as is the case with the cooling liquid supply member 1 of the present embodiment.

The discharge holes provided in the coolant supply pipe 11 will be described. The coolant supply pipe 11 is provided with a discharge hole for discharging the coolant supplied to the inside of the pipe to the outside through the inside and outside of the pipe. At least a part of the discharge hole is provided such that the coolant is discharged in a direction along the circumferential direction of the rotary electric machine as viewed along the rotation shaft direction of the rotor. Hereinafter, such a discharge hole will be referred to as "first discharge hole 13". In the present embodiment, as shown in FIG. 3, in the direction along the circumferential direction of the rotary electric machine from the center of the tube (that is, in the left-right direction in FIG. 3) as viewed along the extending direction of the coolant supply tube 11. , And the first discharge holes 13, 13 are opened. Further, although not essential, in the present embodiment, the first discharge holes 13, 13 are opened in the direction orthogonal to the extending direction of the cooling fluid supply pipe 11 when viewed along the radial direction of the rotating electrical machine. There is.

As shown in FIGS. 4 and 5, the coolant discharged from the first discharge holes 13, 13 flows along the surfaces of the guide members 12, 12, and the curved or bent shape of the guide members 12, 12 The direction is changed and guided to the stator coils (coil ends 93a, 93b). In FIGS. 4 and 5, the flow of the discharged coolant is indicated by a white arrow. The same applies to FIG. 8 described later.

Further, the coolant supply pipe 11 is a discharge hole (hereinafter also referred to as "second discharge hole 14") which discharges oil so as to be applied directly to the stator coil as in the conventional known coolant supply pipe. May be included. The second discharge holes 14, 14 are, as seen in FIG. 3, a direction from the center of the tube toward the coil 93 (typically, the diameter of the rotating electrical machine is viewed along the extending direction of the coolant supply tube 11). Direction). The coolant discharged from the second discharge holes 14, 14 is directly applied to the coil ends 93a, 93b to cool the coils.

The manufacturing method of the cooling fluid supply member 1 which comprises the cooling structure of the rotary electric machine of the said embodiment is demonstrated. The rotating electric machine and the other components may be procured by a known structure or a known manufacturing method.

Although not essential, the coolant supply member 1 having the above-described structure can be manufactured, for example, using injection molding of a thermoplastic resin.
In the manufacturing method using injection molding, the pipeline through which the coolant flows in the portion of the coolant supply tube 11 may be formed by a core mold, or may be formed by a so-called floating core method. Depending on the shape, the pipeline may be opened by a drill after injection molding. Alternatively, after injection molding of the semi-broken body, the semi-broken bodies may be welded together to form the coolant supply pipe 11 having a pipeline through which the coolant flows.

It is preferable that the discharge holes 13 and 14 be formed by using a pin or a slide mold when injection molding of the pipe body 11 if possible. It is also good.

The guide member 12 is preferably integrally molded with the cooling liquid supply pipe 11 using injection molding, but integral molding is not essential, and the cooling liquid supply pipe 11 and the guide member 12 are formed independently of each other. They may be assembled to produce the coolant supply member 1.
Moreover, the material which comprises the cooling fluid supply pipe | tube 11 and the guide member 12 is not limited to the synthetic resin which can be inject-molded, A metal etc. may be sufficient. In the case of metal, the coolant supply member 1 may be manufactured using a known processing method such as welding, crimping, or cutting.

The operation and effects of the cooling structure of the rotating electrical machine according to the above embodiment will be described. According to the cooling structure of the above embodiment, the guide member 12 extends along the circumferential direction of the rotary electric machine near the connection portion 12 a with the coolant supply pipe 11 and extends to the stator end 12 b in the circumferential direction. A first discharge hole 13 is provided so as to be bent or curved in a direction toward 93, and to discharge the coolant in a direction along the circumferential direction of the rotary electric machine as viewed along the rotation axis of the rotor. Since the coolant discharged from the first discharge hole 13 flows along the surface of the guide member 12 and is led to the stator coil 93, the position separated from the coolant supply pipe 11 in the circumferential direction of the rotary electric machine The cooling fluid can be accurately supplied to the portion of the stator coil disposed at the side, and the cooling can be performed effectively.

In the prior art described in Patent Document 1, the refrigerant is also injected obliquely from the pipe member as viewed along the axial direction, and the refrigerant is also supplied to a position away from the pipe member. However, if it is attempted to supply the refrigerant also to a position separated in the circumferential direction from the pipe member by the technique of Patent Document 1, the refrigerant is supplied and supplied at an angle (a lying angle) substantially inclined to the outer peripheral surface of the stator coil. The inventors of the present invention have found a problem that the refrigerant is repelled on the outer peripheral surface of the stator coil and hardly enters the inside of the coil, and the refrigerant can not be efficiently delivered to the coil at a position distant from the pipe member in the circumferential direction.

Moreover, in the prior art described in patent document 2, the oil discharged from the protrusion hole of the upper part of the oil pipe is dripped at the upper part of a coil by the guide rib provided in the case etc. However, even in the prior art of Patent Document 2, the oil discharged from the protruding hole at the top of the oil pipe also diffuses in the axial direction of the rotating electrical machine, and only a part of the discharged oil is used for cooling the coil The inventors found out the problem with

According to the cooling structure of the rotating electrical machine of the above embodiment of the present invention, the coolant discharged from the first discharge holes 13 and 13 in the direction along the circumferential direction of the rotating electrical machine is along the surface of the guide member 12 The flow does not spread too much, and the guide member is guided toward the coil near the end of the curved or bent guide member. Therefore, the coolant discharged from the first discharge holes 13 can be efficiently sent from the coolant supply pipe 11 to a position separated in the circumferential direction of the rotary electric machine without diffusing much. By such an operation, it is possible to effectively cool the stator coils 93, 93 while enhancing the utilization efficiency of the discharged coolant. Further, since the coolant can be efficiently sent from the coolant supply pipe 11 to a position separated in the circumferential direction of the rotary electric machine, the number of coolant supply pipes to be disposed may be reduced.

The invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. In the following description, parts different from the above embodiment will be mainly described, and the detailed description of the same parts will be omitted. In addition, these embodiments can be implemented by combining some of them with each other or replacing some of them.

In the description of the above embodiment, it has been described that the guide member 12 extends along the circumferential direction of the rotary electric machine in the vicinity 12a of the connection portion with the cooling liquid supply pipe 11. The circumferential direction of the rotating electrical machine does not have to be exactly the same, and the coolant discharged from the first discharge hole along the circumferential direction generally flows along the wall surface of the guide member. Just do it.

Moreover, in the description of the above embodiment, it has been described that the first discharge holes 13 are provided such that the coolant is discharged in the direction along the circumferential direction of the rotating electrical machine. The circumferential direction does not have to be exactly the same, and the coolant discharged from the first discharge hole may flow generally in the circumferential direction of the rotary electric machine when viewed along the axial direction. The allowable angle between both is preferably 30 degrees or less, more preferably 15 degrees or less.

Further, the specific shape of the first discharge holes 13, 13 is not particularly limited. The shape of the outline of the hole may be circular, rectangular, semicircular, semicylindrical or the like. Although not essential, as shown in FIG. 3, the positions where the first discharge holes 13, 13 are provided are in the vicinity of a position in the circumferential direction of the rotary electric machine from the center of the tube of the coolant supply pipe 11. Is preferred. The direction in which the first discharge holes 13 penetrate the wall of the coolant supply pipe 11 is preferably a direction along the circumferential direction of the rotating electrical machine as shown in FIG.

Moreover, in the description of the above embodiment, the embodiment in which the guide member is formed to be curved at the end portion in the circumferential direction has been described, but it is not essential to be curved, and it may be bent. In the case of the bending form, it is preferable to set the bending angle to 60 degrees or less, more preferably 45 degrees or less, so that the flow of the discharged coolant is not easily blocked. When the surface of the guide member is to be bent, it is preferable that the guide member be bent stepwise at a plurality of places instead of being bent at a large angle at one time.

Further, at the circumferential end of the guide member, the angle between the end of the guide member and the radial direction of the rotary electric machine is preferably 40 degrees or less, more preferably 25 degrees or less, as viewed along the axial direction. You should do it. As in the above embodiment, it is particularly preferable that the circumferential end portion of the guide member extends generally along the radial direction of the rotating electrical machine. In this way, the coolant is likely to be bent and flow at the curved end of the guide member so as to reach from the end of the guide member to the back of the coil, and the use efficiency of the coolant is further enhanced. In the case where the coolant supply member 1 is provided not diagonally above the coil of the rotary electric machine but diagonally or laterally (a side surface), it is preferable to have such a configuration.

FIG. 6 is a perspective view showing the coolant supply member 2 of the second embodiment in which the guide members 22 are integrated with the coolant supply pipe 21. Also in this embodiment, the coolant discharged from the first discharge holes 23 and 23 in the circumferential direction of the rotary electric machine flows along the surface of the guide member 22 and is a curved portion formed by the end 22 b of the guide member 22. Are guided in the direction toward the coil end in the same manner as in the first embodiment.

In the present embodiment, a groove 22 c is formed on the surface of the guide member 22, and the coolant discharged from the discharge hole 23 flows along the groove 22 c and is led to the stator coil. The grooves 22 c are formed along the direction from the coolant supply pipe 21 toward the end 22 b of the guide member 22 so as not to impede the flow of the coolant.
More specifically, the guide member 22 is a plate-shaped member, and the groove 22 c is formed by forming the guide member 22 in a corrugated plate shape. The groove 22c is preferably formed at a circumferential end (portion opposite to the coolant supply pipe 21) 22b at which the guide member 22 curves or bends in a direction toward the coil.

If a groove is formed in the guide member and the discharged coolant flows along the groove, the coolant can be efficiently applied to the desired position even at a position separated from the coolant supply pipe. Cooling efficiency is increased. In addition, if at least the circumferential end 22b of the guide member 22 is formed in a corrugated plate shape, the coolant is likely to be collected in the groove of this portion, and the coolant may be applied more efficiently to the desired position. become able to.

Further, in the present embodiment, when viewed along the radial direction of the rotary electric machine, the grooves 22c, 22c are adjacent in a radial direction, that is, toward the end 22b of the guide member 22 from the cooling fluid supply pipe 21 side. The grooves 22c, 22c are provided such that the distance between the centers of the grooves is increased. With the configuration of the groove, the first discharge holes 23, 23 of the coolant supply pipe 21 are densely provided at the axial center of the pipe. That is, in the present embodiment, the axial position of the groove 22c at the circumferential end 22b of the guide member 22 and the axial position of the discharge hole 23 for discharging the coolant to the groove 22c, with respect to a part of the discharge holes. But in different positions.

With such a configuration, the degree of freedom of the positional relationship between the discharge hole 23 and the position of the coil to be cooled can be enhanced with respect to the axial position of the rotating electrical machine. Therefore, the range in which the coolant can be supplied is expanded, or the coolant supply pipe can be shortened, so that the degree of freedom in design is enhanced, and the cooling structure of the rotary electric machine can be realized more effectively and efficiently.

FIG. 7 is a perspective view showing the coolant supply member 3 of the third embodiment in which the guide members 32, 32 are integrated with the coolant supply pipe 31. As shown in FIG. In the present embodiment, a plurality of ribs 35, 35 are erected on the guide members 32, 32, and a portion between the rib 35 and the rib 35 becomes a groove, like the groove 22c in the second embodiment. To function. Therefore, the ribs 35 are preferably provided at least at the circumferential end 32 b of the guide member 32. Such a rib is easy to form using injection molding, and the effect of suppressing the diffusion of the coolant discharged from the first discharge holes 33, 33 is also high.

When the groove is formed in the guide member as in the second embodiment and the third embodiment, the width of the groove may be narrowed toward the circumferential end of the guide member. In this way, the diffusion of the coolant is suppressed, which is suitable for concentrating the oil on a specific location.

FIG. 8 shows a coolant supply member 4 according to a fourth embodiment in which the guide members 42 are integrated with the coolant supply pipe 41. The configuration of the coolant supply member 4 of the present embodiment is substantially the same as that of the coolant supply member 1 of the first embodiment shown in FIGS. 2 and 3, but the first discharge holes 43 a, 43 b and 43 c are mainly The form provided is different. As shown in FIG. 8, in the present embodiment, the coolant is discharged in a direction inclined with respect to the circumferential direction as seen from the radial direction of the rotary electric machine in a part (43 a, 43 c) of the first discharge holes. It is provided as. That is, in the lower view of FIG. 8, the first discharge holes 43a discharge the cooling liquid obliquely upward, and the first discharge holes 43c discharge the cooling liquid obliquely downward. As a result, with regard to the axial position of the coolant supply pipe 41, the first discharge holes 43a and 43c can efficiently supply the coolant to different positions in the axial direction. Even with such a configuration, the degree of freedom of the positional relationship between the discharge holes 43a and 43c and the position of the coil to be cooled can be enhanced with respect to the axial position of the rotating electrical machine. Therefore, the range in which the coolant can be supplied is expanded, or the coolant supply pipe can be shortened, so that the cooling structure of the rotating electrical machine can be realized more effectively and efficiently.

In the second to fourth embodiments, the description of the second discharge holes 14 and 14 provided in the first embodiment is omitted, but also in these embodiments, as in the first embodiment, the second discharge holes 14 and 14 are omitted. 2 Discharge holes may be provided.

Further, in the description of the above-described embodiment, regarding the coolant supply member in which the coolant supply pipe and the guide member are integrated, the detailed description of the mounting portion and the fixing portion is omitted. Moreover, description is abbreviate | omitted also about the detail of a connection part with the other pipe line in a coolant supply pipe, a pipe line blocking member, etc., etc. FIG. Known techniques may be used for these. In addition, a seal portion may be provided as appropriate for a connection portion such as a conduit.

The application of the cooling structure of the rotating electrical machine according to the above embodiment is not limited to the rotating electrical machine used in a hybrid vehicle, and includes a rotatable rotor and a stator provided on the outer periphery thereof to cool the stator coil with a coolant. It can be widely used if it is an application where an electric machine is used. For example, such a rotating electric machine can be used for an electric car, an industrial power motor, a power generation facility, and the like.

The cooling structure of the rotating electrical machine according to the above-described embodiment can be used, for example, to cool a motor generator used in a hybrid vehicle, and has high industrial utility value.

DESCRIPTION OF SYMBOLS 1 Coolant supply member 11 Coolant supply tube 12 Guide member 13 First discharge hole 14 Second discharge hole 91 Rotor 94 Stator 92 Stator core 93 Stator coil

Claims (6)

A cooling structure of a rotating electrical machine, comprising: a rotor rotatable about an axis; a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor; and a stator having a stator coil wound around the stator core. ,
The cooling fluid supply pipe is provided so as to extend in the axial direction of the rotor, and has a conduit through which the cooling fluid flows, and at least one discharge hole for discharging the cooling fluid to the stator coil.
A guide member integrated with the coolant supply pipe;
The guide member extends along the circumferential direction of the rotary electric machine near the connection portion with the coolant supply pipe, and is bent or curved in the direction toward the stator coil toward the circumferential end portion,
At least a portion of the discharge hole is provided such that the coolant is discharged in a direction along the circumferential direction of the rotary electric machine as viewed along the axial direction, and the coolant discharged from the discharge hole is formed on the surface of the guide member. Flows along and is led to the stator coil,
Cooling structure of the rotating electrical machine. A groove is formed in the guide member, and the coolant discharged from the discharge hole flows along the groove and is led to the stator coil.
The cooling structure of the rotary electric machine according to claim 1. The axial position of the groove at the circumferential end of the guide member and the axial position of the discharge hole for discharging the coolant to the groove are different positions.
The cooling structure of the rotary electric machine according to claim 2. At least the circumferential end of the guide member is formed in a corrugated plate shape,
The cooling structure of the rotary electric machine according to claim 2. A plurality of ribs are erected on the guide member, and the space between the ribs is the groove,
The cooling structure of the rotary electric machine according to claim 2. The coolant is discharged from the discharge hole in a direction inclined with respect to the circumferential direction as viewed along the radial direction of the rotating electrical machine, and the coolant is guided by the guide member.
The cooling structure of the rotary electric machine according to claim 1.

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