JP2015211543A - Cooling structure of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a rotary electric machine capable of efficiently performing cooling.SOLUTION: The cooling structure of the rotary electric machine including a stator 110 and a rotor includes a coolant flow passage pipe 161 which is provided along an axially outer end face of the rotary electric machine and extends in a circumferential direction around an axis of the rotary electric machine. The coolant flow passage pipe 161 is formed to be a curved surface in a view of a cross section orthogonal to a conduit direction of the coolant flow passage pipe 161, and on an outer peripheral surface, a plurality of openings communicating to the inside of the pipe are formed at positions opposite to the axially outer end face of the rotary electric machine. The plurality of openings include openings at different angles formed to a virtual plane where the coolant flow passage pipe 161 extends in a view of each cross section orthogonal to the conduit direction of the coolant flow passage pipe 161.

Description

  The present invention relates to a cooling structure for a rotating electric machine that can be mounted on an electric vehicle or a hybrid vehicle.

  FIG. 17 is a perspective view of the side cover that covers the side surface portion of the electric motor in the drive device for the electric vehicle described in Patent Document 1, as viewed from the inside. FIG. 18 is a front view showing the positional relationship between the plurality of discharge holes of the side cover shown in FIG. 17 and the coils of the electric motor. In the drive device for an electric vehicle described in Patent Document 1, as shown in FIGS. 17 and 18, a side cover 82 that covers a side surface portion of the electric motor is formed of resin, and an oil passage 90 provided in the side cover 82. Lubricating oil is sprayed onto the stator 71 of the electric motor from the plurality of (91, 92) discharge holes 95 to cool it. The plurality of discharge holes 95 are provided in the circumferential direction at positions corresponding to the upper semicircular portions of the plurality of salient pole concentrated winding coils 71 c of the stator 71. Also, the plurality of discharge holes 95 are injected with lubricating oil toward the radial center portion 71c1 of the bent and bent portion of the salient pole concentrated winding coil 71c wound around the body portion of the substantially rectangular insulator. Arranged so that.

  FIG. 19 is a radial cross-sectional view illustrating an oil cooling structure of a motor described in Patent Document 2. FIG. 20 is a plan view showing a main part of the cooling structure of the motor shown in FIG. As shown in FIGS. 19 and 20, the oil cooling structure of the motor M described in Patent Document 2 is arranged along the circumferential direction of the motor M, and a plurality of oil cooling structures are ejected along the axial direction of the motor M. The plurality of injection holes 5 for cooling the coils 3 are provided. The injection hole 5 is disposed so as to face the gap between the adjacent divided stator cores 2a and 2a or between the coils 3 and 3.

International Publication No. 2012/046307 JP 2010-057261 A

  Lubricating oil from the plurality of discharge holes 95 of the oil passage 90 described in Patent Document 1 toward the central portion 71c1 in the radial direction of the bent and bent portion of the salient pole concentrated winding coil 71c shown in FIG. Is injected. Further, oil is ejected from the injection hole 5 in the oil cooling structure of the motor described in Patent Document 2 toward the gap between the adjacent divided stator cores 2 a and 2 a or between the coils 3 and 3. As described above, in both the structures of Patent Document 1 and Patent Document 2, the direction in which the lubricating oil is ejected with respect to the motor axial direction is the same in all holes. However, since the stator and the rotor of the motor, which are the targets of cooling by the lubricating oil, each have a three-dimensional complex shape, a portion where the lubricating oil does not reach and cooling is not sufficiently performed may occur in the motor. The cooling efficiency of such a motor may not be sufficient.

  The objective of this invention is providing the cooling structure of the rotary electric machine which can be cooled efficiently.

In order to achieve the above object, the invention described in claim 1
A cooling structure for a rotating electrical machine having a stator (for example, a stator 110 in an embodiment described later) and a rotor,
A refrigerant channel pipe (for example, a refrigerant channel pipe 161 in an embodiment described later) provided to face the axially outer end surface of the rotating electrical machine,
The outer peripheral surface of the refrigerant channel tube is formed to have a curved shape when viewed in a cross section orthogonal to the pipe direction of the refrigerant channel tube,
A plurality of openings (for example, openings 163, 163b, and 163c in the embodiments described later) are formed on the outer peripheral surface at positions facing the outer end surface in the axial direction of the rotating electrical machine.
The plurality of openings include openings having different angles with respect to an imaginary plane in which the refrigerant channel pipe extends when viewed in each cross section orthogonal to the pipe direction of the refrigerant channel pipe.

The invention according to claim 2 is the invention according to claim 1,
The refrigerant channel pipe extends in a circumferential direction around the axis of the rotating electrical machine.

The invention according to claim 3 is the invention according to claim 1 or 2,
The plurality of openings include a first opening (for example, an opening 163b in an embodiment described later) that opens toward the inner peripheral side of the axially outer end surface of the rotating electrical machine, and an axially outer end surface of the rotating electrical machine. 2nd opening (for example, opening 163c in below-mentioned embodiment) opened toward an outer peripheral side.

In invention of Claim 4, in invention of any one of Claims 1-3,
At least a part of the refrigerant channel tube viewed from the axial direction of the rotating electrical machine extends in the circumferential direction from one of the circumferences around the axis of the rotating electrical machine to the other,
The plurality of openings are formed at positions shifted from each other along the pipe direction of the refrigerant flow pipe.

The invention according to claim 5 is the invention according to claim 4,
The refrigerant channel tube extends in an annular shape along an axially outer end surface of the rotating electrical machine.

The invention according to claim 6 is the invention according to any one of claims 1 to 5,
The coil of the stator is configured with a coil end by an assembly coil plate configured in two stages in the radial direction,
The plurality of openings are an opening (for example, an opening 163b in an embodiment described later) that opens toward an inner diameter side coil plate and an opening that opens toward an outer diameter side coil plate (for example, an embodiment described later). 163c).

The invention according to claim 7 is the invention according to any one of claims 1 to 6,
The rotating electrical machine includes a first rotating electrical machine and a second rotating electrical machine disposed at positions spaced apart in the axial direction,
The refrigerant channel pipe is disposed between the first rotating electric machine and the second rotating electric machine,
The plurality of openings are an opening that opens toward an axially outer end face that faces the refrigerant flow pipe of the first rotating electrical machine, and an axial direction that faces the refrigerant flow pipe of the second rotating electrical machine. And an opening that opens toward the outer end surface.

According to the first aspect of the present invention, when the plurality of openings formed in the peripheral surface of the refrigerant flow channel tube are viewed in each cross section orthogonal to the pipe direction of the refrigerant flow channel tube, the refrigerant flow channel Since the openings having different angles formed with respect to the virtual plane where the pipe extends are included, the refrigerant is injected from each opening at different angles with respect to different portions of the axially outer end surface of the rotating electrical machine. As a result, the rotating electrical machine can be efficiently cooled.
Further, since the outer peripheral surface of the refrigerant channel tube is formed to have a curved shape when viewed in a cross section perpendicular to the pipe direction of the refrigerant channel tube, the direction in which the refrigerant is injected is It can be easily changed by changing the circumferential phase on the outer peripheral surface where the opening is formed (the angle with respect to the virtual surface when viewed in each cross section orthogonal to the pipe line direction). For this reason, the opening which can inject a refrigerant | coolant with respect to the location which needs cooling of a rotary electric machine can be easily formed, suppressing complication of the structure of a refrigerant flow path.

  According to invention of Claim 2, a refrigerant | coolant is supplied to the whole axial direction outer side end surface of a rotary electric machine.

  According to the third aspect of the invention, the refrigerant can be injected from the first opening toward the inner peripheral side of the axially outer end surface of the rotating electrical machine, and from the second opening, The refrigerant can be injected toward the outer peripheral side of the axially outer end face. Thus, the rotating electrical machine can be cooled more efficiently by separately injecting the refrigerant into the inner peripheral side and the outer peripheral side of the rotating electrical machine.

  According to the fourth aspect of the present invention, it is possible to inject the refrigerant from each opening to different portions of the axially outer end surface of the rotating electrical machine, and it is possible to easily form the opening. Moreover, the fall of the intensity | strength of the refrigerant | coolant flow path pipe by providing an opening can be suppressed.

  According to the fifth aspect of the present invention, the refrigerant channel tube is provided over substantially the entire circumference of the axially outer end surface of the rotating electrical machine, and the coolant is injected over substantially the entire axially outer end surface of the rotating electrical machine. In addition, the rotating electrical machine can be cooled more efficiently.

  According to invention of Claim 6, each coil plate can be cooled efficiently by injecting a refrigerant | coolant to each coil plate of the inner diameter side and outer diameter side which comprise the coil end of the stator of a rotary electric machine, respectively.

  According to the seventh aspect of the present invention, since each rotary electric machine can be cooled by one refrigerant channel tube common to the first rotary electric machine and the second rotary electric machine, the refrigerant flow with respect to the number of rotary electric machines Each rotary electric machine can be efficiently cooled while suppressing the number of road pipes.

It is a perspective view of the stator of the rotary electric machine which concerns on this invention. It is a disassembled perspective view of the stator shown in FIG. (A) is an exploded perspective view of one base plate assembly shown in FIG. 2, and (b) is an exploded perspective view of the other base plate assembly. It is a perspective view of a slot coil. It is a longitudinal cross-sectional view of the stator shown in FIG. 1, and is the sectional view on the AA line of FIG. FIG. 4 is a front view of one base plate assembly shown in FIG. FIG. 4 is a rear view of one base plate assembly shown in FIG. It is a perspective view of a segmented multi-phase coil of a double slot type. It is a front view of a refrigerant channel pipe. It is a figure which shows the positional relationship of a refrigerant flow pipe and a stator. It is a longitudinal cross-sectional view of a refrigerant flow pipe and a stator, and is a cross-sectional view along the line DD of FIG. (A) is the BB sectional drawing of FIG. 9, (b) is CC sectional view taken on the line of FIG. It is a figure which shows the state by which the refrigerant | coolant is sprayed from the refrigerant flow path pipe | tube on the axial direction outer side end surface of the stator of a rotary electric machine. It is a figure which shows the state by which the refrigerant | coolant is sprayed from the refrigerant | coolant flow path pipe | tube on the axial direction outer side end surface of the stator of the rotary electric machine of another form. It is a longitudinal cross-sectional view of the refrigerant | coolant flow path pipe and the stator of each rotary electric machine in the state in which the refrigerant flow path pipe was provided between two rotary electric machines. It is a longitudinal cross-sectional view of the refrigerant flow path pipe and the stator in a modification of the positional relationship between the refrigerant flow path pipe and the stator. It is the perspective view which looked at the side cover which covers the side part of the electric motor in the drive device of the electric vehicle described in patent document 1 from the inner side. FIG. 18 is a front view showing a positional relationship between a plurality of discharge holes of the side cover shown in FIG. 17 and coils of the electric motor. It is radial direction sectional drawing explaining the oil cooling structure of the motor described in patent document 2. FIG. It is a top view which shows the principal part of the cooling structure of the motor shown in FIG.

  First, an embodiment of a stator of a rotating electrical machine that can employ the cooling structure of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

[Stator]
As shown in FIGS. 1, 2, and 5, the stator 110 of the rotating electrical machine of the present embodiment includes a stator core assembly 120 and a pair of base plate assemblies 130 </ b> L and 130 </ b> R, and the base plate assemblies 130 </ b> L and 130 </ b> R are provided. The stator core assembly 120 is disposed and assembled on both sides. Between the stator core assembly 120 and the base plate assemblies 130L and 130R, for example, an insulating sheet 165 such as a silicon sheet is disposed to insulate the stator core assembly 120 and the base plate assemblies 130L and 130R.

  The stator core assembly 120 includes a stator core 121 and a plurality of (in the illustrated embodiment, 48) slot coils 125.

  The stator core 121 is configured, for example, by laminating a plurality of stamped silicon steel plates, and 48 teeth 122 and 48 slots formed between adjacent teeth 122 and 122 on the radially inner side thereof. 123. The slot 123 is formed so as to penetrate the stator core 121 in the axial direction, is formed in a substantially oval shape that is long in the radial direction of the stator core 121 when viewed from the axial direction, and the opening 124 opens to the inner peripheral surface of the stator core 121. Yes.

  With reference to FIG. 4, the slot coil 125 has an outer diameter side slot coil 126 and an inner diameter side slot coil 127 having the same shape and the same length shifted in the axial direction by the thickness of the connection coil 140 described later. The periphery except for both ends is integrally formed by being covered with an insulating material 128 such as injection molded resin. Specifically, the lengths of the outer diameter side slot coil 126 and the inner diameter side slot coil 127 are set to lengths substantially equal to the sum of the axial length of the stator core 121 and the thickness of the three connection coils 140, respectively. The small diameter portions 126 a and 127 a having a length substantially equal to the thickness of the connection coil 140 are formed at both ends of the connection coil 140.

  As shown in FIG. 5, the plurality of slot coils 125 (48 in the embodiment shown in the figure) consisting of the outer diameter side slot coil 126 and the inner diameter side slot coil 127 are outside in the radial direction, as shown in FIG. Thus, the stator cores 121 are arranged in the radial direction, inserted into the 48 slots 123 of the stator core 121, and arranged in the circumferential direction of the stator core 121, thereby forming the stator core assembly 120.

  The outer-diameter side slot coil 126 has a small-diameter portion 126a protruding from one end surface 121a (left end surface in FIG. 5) of the stator core 121 by a thickness of approximately two connection coils 140, and the other end surface 121b (in FIG. 5). The small-diameter portion 126a protrudes from the right end surface) by the thickness of approximately one connection coil 140 and is inserted into the slot 123.

  Further, in the inner diameter side slot coil 127, the small diameter portion 127a protrudes from the one end surface 121a of the stator core 121 by the thickness of approximately one sheet of the connection coil 140, and from the other end surface 121b, approximately two sheets of the connection coil 140. The small diameter portion 127 a protrudes by the thickness and is inserted into the slot 123. Between the outer diameter side slot coil 126 and the inner diameter side slot coil 127 and the slot 123 of the stator core 121, an insulating material 128 that covers both the slot coils 126 and 127 is interposed to ensure insulation from the stator core 121. ing. Therefore, the outer-diameter side slot coil 126 and the inner-diameter side slot coil 127 are covered with the insulating material 128 while being shifted in the axial direction so that the axial positions of both end portions thereof are different.

  The insulating material 128 covering the outer diameter side slot coil 126 and the inner diameter side slot coil 127 has substantially the same shape slightly larger than the slot 123, and can be easily fixed to the slot 123 by press-fitting. Further, since the outer diameter side slot coil 126 and the inner diameter side slot coil 127 are thicker than the conventional coil formed by winding, the space factor in the slot 123 is also improved.

  As shown in FIGS. 3A and 3B, the base plate assemblies 130L and 130R respectively disposed on both sides of the stator core assembly 120 include base plates 131L and 131R and a plurality of connection coils 140. The base plate assembly 130R is the same as the base plate assembly 130L except for the fact that it does not include a connection terminal portion, which will be described later, and the shape of the grooves and connection coils. explain.

  The base plate 131L is formed of an insulating resin (nonmagnetic material) and is a substantially annular member having an inner and outer diameter substantially equal to the stator core 121 as shown in FIGS. A deployment part 131a extending in a fan shape is provided on the radially outer side. A connecting terminal portion for connecting to an external device or the like is formed in the developing portion 131a.

  On the inner diameter side of the base plate 131 </ b> L, 48 pairs of outer diameter side through-holes 132 corresponding to the outer diameter side slot coil 126 and the inner diameter side slot coil 127 of each slot coil 125 inserted in the slot 123 of the stator core 121, respectively. An inner diameter side through hole 133 is formed through the base plate 131L.

  The outer diameter side through hole 132 and the inner diameter side through hole 133 that are paired are located on the same straight line L extending in the radial direction from the center O of the base plate 131L, and further on the straight line L and the outer diameter of the base plate 131L. On the side, an outer peripheral side hole 134 is formed to communicate the outer side surface 135 and the inner side surface 136 (see FIG. 5) of the base plate 131L. Further, twelve connection terminal joint holes 139 are formed at positions in the circumferential direction where the expanded portion 131a is formed, which are located in the expanded portion 131a on the radially outer side of the position of the outer peripheral side hole 134.

As shown in FIGS. 5 to 7, the outer surface 135 and the inner surface 136 of the base plate 131L have a plurality of (48) outer surface grooves each having a substantially U-shaped cross section that opens to the outer surface 135 and the inner surface 136, respectively. The inner surface groove 138 and the inner surface groove 138 are formed adjacent to each other in the circumferential direction along the involute curve. The outer surface grooves 137 adjacent to each other and the inner surface grooves 138 are separated by a wall 131b erected from the base plate 131L, and the outer surface grooves 137 and the inner surface grooves 138 facing each other in the axial direction are separated from each other. They are isolated by 131c and electrically insulated from each other.
The base plate 131L has an axis substantially equal to the sum of the groove depths of the outer surface groove 137 and the inner surface groove 138 corresponding to the thicknesses of the outer connection coil 141 and the inner connection coil 142, which will be described later, and the thickness of the partition wall 131c. Set to the direction width.

  In the base plate assembly 130L, as shown in FIG. 6, each outer surface groove 137 of the base plate 131L has an outer diameter side through hole 132 and three clockwise separations from the outer diameter side through hole 132 when viewed from the front. The outer circumferential side hole 134 formed on the straight line L passing through the outer diameter side through hole 132 is curved and formed along an involute curve. However, of the plurality of outer surface grooves 137, twelve outer surface grooves 137 a extending toward the developing portion 131 a pass through the outer diameter side through hole 132 separated by three from the outer diameter side through hole 132 in the clockwise direction. After extending in an involute shape up to the straight line L, it is bent in the radial direction and connected to the connection terminal joint hole 139.

  Further, as shown in FIG. 7, each inner surface groove 138 of the base plate 131 </ b> L has an inner diameter side through hole 133 and a clockwise direction from the inner diameter side through hole 133 in the front view (counterclockwise as viewed from the FIG. 6 side). B) The outer peripheral side hole 134 formed on the straight line L passing through the inner diameter side through hole 133 separated by three is connected to be bent while avoiding the outer diameter side through hole 132. However, among the plurality of inner side surface grooves 138, twelve inner side surface grooves 138 a extending toward the developing portion 131 a are three in the clockwise direction from the inner diameter side through-hole 133 (counterclockwise as viewed from the side in FIG. 6). After being bent and extended in a similar manner up to a straight line L passing through the inner diameter side through hole 133 that is separated, it is bent in the radial direction and connected to the connection terminal joint hole 139.

  That is, as shown in FIG. 6, the outer diameter side through hole 132 and the inner diameter side through hole 133 that are spaced apart by six pieces in the clockwise direction (or counterclockwise direction) are formed by an outer surface groove 137 and an inner surface groove 138. They are connected via an outer peripheral side hole 134 that continues in common. The pair of outer side surface grooves 137a and inner side surface grooves 138a connected to the common connection terminal joint hole 139 includes an outer diameter side through hole 132 and an inner diameter side through hole that are separated by six in the clockwise direction (or counterclockwise direction). 133 is connected.

  In the base plate assembly 130R, each outer surface groove 137 of the base plate 131R has the same shape as each inner surface groove 138 of the above base plate 131L, and each inner surface groove 138 of the base plate 131R is the above described base plate 131L. Each outer surface groove 137 has the same shape.

  The connection coil 140 is formed in a plate shape using a conductive material such as copper, and is inserted into the outer connection coils 141 (141a, 141b) inserted into the outer side grooves 137, 137a and the inner side grooves 138, 138a, respectively. And the inner connection coil 142 (142a, 142b). The outer connection coil 141 referred to here is a connection coil 140 that is on the outer side in the axial direction of the stator 110 when the stator core assembly 120 and the base plate assembly 130 are assembled. The connecting coil 140 is the inner side of the stator 110 in the axial direction.

  As shown in FIG. 6, the outer connecting coil 141a is formed along an involute curve having the same shape as the outer surface groove 137, and coupling holes 143a and 143b are formed at both ends thereof. The coupling hole 143a has substantially the same diameter as the small-diameter portion 126a of the outer diameter side slot coil 126, and the coupling hole 143b connects the outer connection coil 141a and the inner connection coil 142a described later with reference to FIGS. It has a diameter substantially equal to the connection pin 145 shown in b). The outer connection coil 141b is formed to be curved in the same shape as the outer surface groove 137a, and a coupling hole 143a and a connection terminal hole 143c are formed at both ends thereof.

  As shown in FIG. 7, the inner connection coil 142a is formed along an involute curve having the same shape as the inner surface groove 138, and coupling holes 144a and 144b are formed at both ends thereof. The coupling hole 144 a has a diameter substantially equal to the small diameter portion 127 a of the inner diameter side slot coil 127, and the coupling hole 144 b has a diameter substantially equal to the connection pin 145. The inner connection coil 142b is formed to be curved in the same shape as the inner side surface groove 138a, and a coupling hole 144a and a connection terminal hole 144c are formed at both ends thereof.

  Therefore, except for the connection terminal joint hole 139 portion of the base plate 131L, the inner connection coil 142a and the outer connection coils 141a and 141b respectively connected to the outer diameter side slot coils 126 are formed along involute curves, The inner connection coils 142a and 142b and the outer connection coil 141a connected to the inner diameter side slot coil 127 are formed along the involute curve, and the inner diameter side through hole 133 is penetrated from the inner diameter side through hole 133 on the inner diameter side of the involute curve. It extends radially outward so as to bypass the hole 132.

  The outer connection coils 141a and 141b are inserted into the outer surface grooves 137 and 137a, respectively, and the inner connection coils 142a and 142b are inserted into the inner surface grooves 138 and 138a, respectively. Then, conductive connection pins 145 made of copper, aluminum, or the like are inserted into the outer peripheral side holes 134 to electrically connect the outer connection coil 141a and the inner connection coil 142a.

As a result, the coupling hole 143a of the outer connection coil 141a and the coupling hole 144a of the inner connection coil 142a, which are separated by six in the clockwise direction (or counterclockwise direction), are connected to the outer connection coil 141a, the connection pin 145, and Base plate assemblies 130L and 130R are configured in a state of being electrically connected via the inner connection coil 142a.
Instead of providing the connection pin 145 as in the present embodiment, a protrusion having the same shape as the connection pin 145 is integrally formed on one of the outer connection coil 141a and the inner connection coil 142a, and the outer connection coil 141a The outer connection coil 141a and the inner connection coil 142a may be electrically connected by being inserted into the coupling holes 143b and 144b provided on the other side of the inner connection coil 142a.

  The pair of base plate assemblies 130 </ b> L and 130 </ b> R configured in this manner are positioned and assembled at predetermined positions on both sides of the stator core assembly 120. As shown in FIG. 5, in the base plate assembly 130L disposed on one end surface 121a side (left side in the figure) of the stator core 121, the small diameter portion 126a of the outer diameter side slot coil 126 is connected to the outer connection coils 141a and 141b. In addition to being inserted into the hole 143a, the small-diameter portion 127a of the inner diameter side slot coil 127 is inserted into the coupling hole 144a of the inner connection coils 142a and 142b, and then caulked and fixed. That is, the outer connection coils 141a and 141b and the inner connection coils 142a and 142b connect the slot coils 125 of the same phase (for example, U phase) to form a transition portion of the coil 150.

  Further, in the base plate assembly 130R arranged on the other end surface 121b side (right side in the drawing) of the stator core 121, the small diameter portion 126a of the outer diameter side slot coil 126 is inserted into the coupling hole 144a of the inner connection coil 142a. At the same time, the small-diameter portion 127a of the inner diameter side slot coil 127 is inserted into the coupling hole 143a of the outer connection coil 141a and then caulked and fixed. That is, the outer connection coils 141a and 141b and the inner connection coils 142a and 142b connect the slot coils 125 of the same phase (for example, U phase) to form a transition portion of the coil 150.

  Therefore, with respect to the outer diameter side slot coil 126 and the inner diameter side slot coil 127 arranged in the same slot 123, the outer connection coil 141a connected on one end side (the left side in the figure) of the outer diameter side slot coil 126 is radially outward. The inner connection coil 142a that extends in the clockwise direction and is connected to the inner connection coil 142a having the same phase and connected to the other end side (the right side in the drawing) of the outer diameter side slot coil 126 is radially outward and It extends in the clockwise direction and is connected to the outer connection coil 141a having the same phase. Further, the inner connection coil connected on one end side (the left side in the figure) of the inner diameter side slot coil 127 extends radially outward and counterclockwise and is connected to the outer phase connection coil 141a of the same phase. The outer connection coil 141a connected on the other end side (the right side in the figure) of 127 extends radially outward and clockwise and is connected to the inner connection coil 142a of the same phase.

Thus, the stator 110 is configured by assembling a pair of base plate assemblies 130L and 130R on both sides of the stator core assembly 120, and the segmented coils 150 have two coil loops for each phase having the same structure. (U-phase coil 150U, V-phase coil 150V, and W-phase coil 150W) and two coil loops ( U- phase coil 150U, V- phase coil 150V, and W- phase coil 150W) each having the same structure Four coil loops are formed for each phase of the set. For example, in the four coil loops constituting the U-phase coil, two coil loops (U loop) are continuously wound in a clockwise direction, and two coil loops ( U loop) are continuously counterclockwise. Is waved. The outer-diameter side slot coil 126 and the inner-diameter side slot coil 127, which are disposed in one slot 123 and covered with an insulating material 128, are composed of a coil constituting a U loop and a coil constituting a U loop. Thus, the direction of current flow is the same. The other two phases are the same as the U phase. FIG. 8 is a perspective view showing a plurality of segmented (UVW phase) coils segmented from the stator for easy understanding.

[Cooling structure]
Subsequently, a refrigerant channel pipe which is an embodiment of the cooling structure for a rotating electrical machine of the present invention will be described with reference to FIGS. 9 to 11. FIG. 9 is a front view of the refrigerant flow channel 161. FIG. 10 is a diagram showing a positional relationship between the refrigerant flow path pipe 161 and the stator 110. FIG. 11 is a longitudinal sectional view of the refrigerant flow pipe 161 and the stator 110, and is a sectional view taken along the line DD of FIG.

  The refrigerant channel pipe 161 is formed in a substantially annular shape as a whole, and is aligned so that the center Ot of the refrigerant channel pipe 161 shown in FIG. 9 matches the axis of the stator 110. As shown in FIGS. 10 and 11, the refrigerant channel pipe 161 is provided on both outer sides in the axial direction of the stator 110 so as to face the outer end face in the axial direction. In other words, the refrigerant flow channel 161 is provided such that the virtual plane P in which the refrigerant flow channel 161 extends is substantially parallel to the end surfaces on both axial sides of the stator 110, and the center Ot is the axis of the stator 110. Is located on the virtual plane P so as to match.

  The center Ot of the refrigerant channel pipe 161 is the center when the refrigerant channel pipe 161 has an annular shape, and is the intersection of the major axis and the minor axis when the refrigerant channel pipe 161 is elliptical. If the flow path pipe 161 is distorted from an annular shape or an elliptical shape, the center thereof is the intersection of the center of the approximate circle or the major axis and the minor axis of the approximate ellipse.

  One end side of the hollow refrigerant channel pipe 161 extends in the radial direction to form a supply port 171 for a coolant such as cooling oil, and the other end side is closed to form a closed portion 173. The supply port 171 side of the refrigerant flow channel 161 protrudes from the outer periphery of the stator 110.

  A cross section perpendicular to the extending direction of the refrigerant flow pipe 161 (hereinafter referred to as “the pipe direction”) has a circular shape. That is, the outer peripheral surface of the refrigerant flow channel 161 is formed to have a curved shape when viewed in a cross section orthogonal to the pipe direction of the refrigerant flow channel 161. A plurality of openings 163 communicating with the inside of the pipe are provided on the outer peripheral surface of the refrigerant flow pipe 161 facing the stator 110 at positions shifted from each other along the pipe line direction. The plurality of openings 163 include openings having different angles with respect to the virtual plane P in which the refrigerant flow path pipe 161 extends when viewed in each cross section orthogonal to the pipe direction of the refrigerant flow path pipe 161. The refrigerant channel pipe 161 includes, for example, an opening 163b oriented toward the center Ot of the refrigerant channel pipe 161 with respect to the direction perpendicular to the virtual plane P, and the center of the refrigerant channel pipe 161 with respect to the vertical direction. An opening 163c facing away from Ot is provided along the pipe line direction. 12A is a cross-sectional view taken along line BB in FIG. 9, and FIG. 12B is a cross-sectional view taken along line CC in FIG. One of the two openings 163b and 163c is located at an angle θ1 with respect to the virtual plane P with respect to the intersection Od between the virtual plane P and the opening direction of the opening (shown in FIG. 12A). The other opening is a position that forms an angle θ2 with respect to the imaginary plane P around the intersection Od between the imaginary plane P and the opening direction of the opening. (A position on the side farther from the center Ot than the direction of the axis Q shown in FIG. 12B). The angle θ1 is an arbitrary angle of 0 ° <θ1 <90 °, and the angle θ2 is an arbitrary angle of 90 ° <θ2 <180 °.

  The refrigerant is supplied from the supply port 171 of the refrigerant channel pipe 161 by pressure from an oil pump or the like (not shown). The refrigerant supplied to the refrigerant channel pipe 161 fills the inside of the pipe, and one end of the refrigerant channel pipe 161 is closed by the closing portion 173, so that the refrigerant is ejected from each opening 163. As shown in FIG. 10, if the refrigerant flow pipe 161 is provided on the outer side in the axial direction of the stator 110, the base plate assemblies 130 </ b> L and 130 </ b> R of the stator 110 are injected from the opening 163 to the outer end surface in the axial direction. Refrigerant is sprayed. In this embodiment, since the directions of the plurality of openings 163b and 163c with respect to the stator 110 are different, the radial positions of the stator 110 to which the coolant is sprayed are different. FIG. 13 is a view showing a state in which the refrigerant is blown from the refrigerant flow pipe 161 to the axially outer end surface of the stator 110 of the rotating electrical machine of the present embodiment. As shown in FIG. 13, from the opening 163b, the refrigerant is injected toward the inner peripheral side of the axially outer end surface of the stator 110, and from the opening 163c provided at a position shifted from the opening along the pipe line direction. Is injected toward the outer peripheral side of the axially outer end face of the stator 110.

  Note that a rotor (not shown) is rotatably disposed on the inner diameter side of the stator 110 of the present embodiment. Therefore, the refrigerant injected into the stator 110 from the opening 163 located on the upper side in the vertical direction from the shaft of the rotating electrical machine is transmitted from the stator 110 to the upper portion of the rotor. In this case, the refrigerant also cools the upper part of the rotor. Moreover, some of the plurality of openings 163 may be formed toward the axially outer end surface of the rotor. In this case, the refrigerant is sprayed directly on the outer end face in the axial direction of the rotor.

  The refrigerant channel pipe 161 is attached to the inner wall of the case for housing the rotating electrical machine of the present embodiment or the base plate assembly 130L constituting the stator 110 via the fixture 167 shown in FIGS. It is attached to the wall surface of the base plate assembly 130R. In addition, the stator of the rotating electrical machine cooled by the refrigerant injected from the refrigerant flow pipe 161 is not limited to the stator 110 of the present embodiment shown in FIG. 1, but the pair of base plate assemblies 130 </ b> L and 130 </ b> R that constitute the stator 110. A stator in which another pair of base plate assemblies 230L and 230R in which a plurality of connection coils are arranged on base plates 231L and 231R having a diameter larger than that of the base plates 131L and 131R may be stacked on the inner side in the axial direction. FIG. 14 is a diagram illustrating a state in which the refrigerant is blown from the refrigerant flow pipe 161 to the axially outer end surface of the stator of the rotary electric machine according to another embodiment.

  As described above, in the present embodiment, when the refrigerant is supplied to the refrigerant flow channel 161 in a state where the center of the refrigerant flow channel 161 is aligned with the shaft of the rotating electrical machine of the present embodiment, The refrigerant is sprayed over substantially the entire circumference of the axially outer end surface of the rotating electrical machine. The plurality of openings 163 for ejecting the refrigerant provided on the outer peripheral surface of the refrigerant flow pipe 161 are opened at different angles from the inner diameter side to the outer diameter side of the axially outer end face of the opposing rotating electrical machine. For this reason, the refrigerant | coolant ejected from each opening 163 is sprayed at a different angle with respect to the different site | part of the axial direction outer side end surface of a rotary electric machine. As a result, the rotating electrical machine can be efficiently cooled.

  Moreover, since the outer peripheral surface of the refrigerant channel pipe 161 is formed to be on a curve when viewed in a cross section orthogonal to the pipe direction of the refrigerant channel pipe 161, the direction in which the refrigerant is injected is It can be easily changed by changing the circumferential phase on the outer peripheral surface where the opening 163 is formed (the angle with respect to the virtual plane P when viewed in each cross section orthogonal to the pipe line direction). For this reason, the opening which can inject a refrigerant | coolant with respect to the location which needs cooling of a rotary electric machine can be easily formed, suppressing complication of the structure of the refrigerant flow path pipe 161.

  Further, since the plurality of openings 163 include openings having different angles with respect to the virtual plane P when viewed in each cross section orthogonal to the pipe line direction, the plurality of openings are formed at the same position in the circumferential direction. Compared to the above, the strength of the refrigerant flow pipe 161 can be secured.

  Furthermore, in the present embodiment, the coolant can be directly sprayed at a different angle from the inner diameter side to the outer diameter side also on the axially outer end surface portion of the rotating electrical machine that is located vertically below the axis of the rotating electrical machine. . For this reason, it is possible to sufficiently cool a portion where the refrigerant does not reach by simply dropping the refrigerant onto the rotating electrical machine from above in the vertical direction. As a result, the stator 110 (particularly, the base plate assemblies 130L and 130R) or the rotor of the rotating electrical machine can be uniformly cooled. In general, the output and operating range of a rotating electrical machine are limited by the temperature of the part that is the maximum temperature of the rotating electrical machine, but if the rotating electrical machine can be uniformly cooled, the output and operating range of the rotating electrical machine can be expanded.

  In addition, as shown in FIG. 15, the refrigerant | coolant flow path pipe 161 may be provided between the two rotary electric machines 100a and 100b spaced apart in the axial direction in the case 181 in which a rotary electric machine etc. are accommodated. In this case, the refrigerant channel pipe 161 faces two axially outer end faces of the two rotating electric machines 100a and 100b facing each other, and a fitting for the refrigerant channel pipe 161 is provided on the convex portion 183 provided on the inner wall of the case 181. 167 is attached. The plurality of openings 163 described above are provided on the outer peripheral surface of the refrigerant flow pipe 161 facing the outer end surface in the axial direction of one rotating electric machine 100a, and the refrigerant flow facing the outer end surface in the axial direction of the other rotating electric machine 100b. Similarly, a plurality of openings 163 are provided on the outer peripheral surface of the road pipe 161. That is, the two rotating electrical machines 100a and 100b can be simultaneously cooled by one refrigerant flow channel pipe 161. For this reason, each rotary electric machine can be cooled efficiently, suppressing the number of refrigerant flow pipes 161 to the number of rotary electric machines. The two rotating electrical machines 100a and 100b are, for example, an electric motor and a generator.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
Moreover, in the said embodiment, although demonstrated as an example the refrigerant | coolant flow-path pipe | tube 161 formed in the substantially annular shape as a whole, as a cooling structure of a rotary electric machine, the lowermost part is not connected seeing from an axial direction. Or two semicircular refrigerant flow pipes divided into left and right when viewed from the axial direction may be used. Further, the cross section orthogonal to the pipe direction of the refrigerant flow pipe 161 is not limited to a circular shape, and may be an elliptical shape.
Further, an insulating cover may be disposed outside the pair of base plate assemblies 30L and 30R in the axial direction, or may be covered with a resin or the like.
In the above embodiment, as shown in FIG. 10, the refrigerant channel pipe 161 is provided such that the surface P along the refrigerant channel pipe 161 is substantially parallel to the end surfaces on both axial sides of the stator 110. However, as shown in FIG. 16, even if the refrigerant flow pipe 161 is provided in a state where the surface P along the refrigerant flow pipe 161 is inclined radially outward with respect to the axially outer end faces of the stator 110. good.
Further, in the above embodiment, as shown in FIG. 12, the plurality of openings 163 provided in the refrigerant flow channel pipe 161 have a refrigerant flow with respect to a direction perpendicular to the plane P along the refrigerant flow channel 161. Although it has been described that the opening 163b oriented toward the center Ot of the path pipe 161 and the opening 163c oriented away from the center Ot of the refrigerant flow path pipe 161 with respect to the vertical direction are included, the opening in the vertical direction is included. Further openings may be included.

  Note that the stator 10 of the present invention is not limited to the double slot type in which coils in the same phase are arranged in every two slots adjacent in the circumferential direction described above, and coils in each phase in each slot in the circumferential direction. May be a single slot type stator in which the coils are arranged or a triple slot type stator in which coils of the same phase are arranged in every three slots adjacent in the circumferential direction.

110 Stator 120 of rotating electric machine Stator core assembly 121 Stator core 123 Slot 125 Slot coil 126 Outer diameter side slot coil 127 Inner diameter side slot coil 128 Insulating material 130L, 130R Base plate assembly 131L, 131R Base plate 132 Outer diameter side through hole 133 Outer diameter side through hole 133 Hole 135 Outer side surface 136 Inner side surface 137, 137a Outer side surface groove 138, 138a Inner side surface groove 140 Connection coil 141, 141a, 141b Outer connection coil 142, 142a, 142b Inner connection coil 150 Coil 150U U-phase coil 150V V-phase coil 150W W Phase coil 161 Refrigerant flow channel pipe 163, 163b, 163c Opening

Claims (7)

A rotating electrical machine cooling structure having a stator and a rotor,
A refrigerant channel pipe provided so as to face the axially outer end surface of the rotating electrical machine,
The outer peripheral surface of the refrigerant channel tube is formed to have a curved shape when viewed in a cross section orthogonal to the pipe direction of the refrigerant channel tube,
In the outer peripheral surface, a plurality of openings communicating with the inside of the pipe are formed at positions facing the axially outer end surface of the rotating electrical machine,
The plurality of openings include openings having different angles with respect to a virtual plane in which the refrigerant flow pipe extends when viewed in each cross section orthogonal to the pipe direction of the refrigerant flow pipe. Cooling structure. The cooling structure for a rotating electrical machine according to claim 1,
The refrigerant channel pipe is a cooling structure for a rotating electrical machine that extends in a circumferential direction about the axis of the rotating electrical machine. A cooling structure for a rotating electrical machine according to claim 1 or 2,
The cooling mechanism for a rotating electrical machine, wherein the plurality of openings include a first opening that opens toward an inner peripheral side of the rotating electrical machine and a second opening that opens toward an outer peripheral side of the rotating electrical machine. A cooling structure for a rotating electrical machine according to any one of claims 1 to 3,
At least a part of the refrigerant channel tube viewed from the axial direction of the rotating electrical machine extends in the circumferential direction from one of the circumferences around the axis of the rotating electrical machine to the other,
The plurality of openings is a cooling structure for a rotating electrical machine formed at positions shifted from each other along a pipe direction of the refrigerant flow pipe. A cooling structure for a rotating electrical machine according to claim 4,
The cooling channel of the rotating electrical machine, wherein the refrigerant channel pipe extends in an annular shape along an axially outer end surface of the rotating electrical machine. A cooling structure for a rotating electrical machine according to any one of claims 1 to 5,
The coil of the stator is configured with a coil end by an assembly coil plate configured in two stages in the radial direction,
The plurality of openings include a cooling structure for a rotating electrical machine, including an opening that opens toward an inner diameter side coil plate and an opening that opens toward an outer diameter side coil plate. A cooling structure for a rotating electrical machine according to any one of claims 1 to 6,
The rotating electrical machine includes a first rotating electrical machine and a second rotating electrical machine disposed at positions spaced apart in the axial direction,
The refrigerant channel pipe is disposed between the first rotating electric machine and the second rotating electric machine,
The plurality of openings includes: an opening that opens toward an axially outer end surface of the first rotating electrical machine; and an opening that opens toward an axially outer end surface of the second rotating electrical machine. Cooling structure.

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