JP6627657B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electric machine used as a motor or a generator.

  A rotating electric machine used as a motor or a generator includes a rotor and a stator disposed around the rotor. The stator has a stator core and a stator coil, and the stator coil is formed by winding a coil wire around the stator core.

  By the way, when a current flows through the stator coil, the stator coil and the stator core generate heat. Such heat affects the magnetic flux generated in the rotating electric machine and lowers the efficiency of the rotating electric machine. Therefore, a rotating electric machine having a cooling structure for cooling the stator coil has been proposed.

  For example, in the rotating electric machine described in Patent Document 1, a coolant is supplied from above the outer periphery of the coil end portion to a coil end portion protruding from both ends in the axial direction of the stator to cool the stator coil. The refrigerant discharged to the coil end portion travels along the winding in the direction of gravity and flows while cooling the winding.

JP 2004-180376 A

  However, in the rotating electric machine described in Patent Literature 1, the winding direction of the coil is not taken into consideration, and insufficient cooling occurs at one of the base end and the tip of the stator coil forming the coil end portion, and the cooling effect is not sufficient. There has been a problem that uniformity occurs.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a rotating electric machine capable of uniformly cooling a coil end portion of a stator coil.

  The rotating electric machine of the present invention includes a rotor (30) rotatable around a rotating shaft (20) extending in a horizontal direction, a stator (40), and a coolant supply unit (50, 60, 70, 80). . Here, “horizontal” is not limited to “horizontal” in a strict sense, and has the same degree of range that is usually determined to be “horizontal” in light of common general knowledge in the technical field. If so, it is interpreted as “horizontal”.

  The stator includes a stator core (41) having a plurality of slots (43) facing the peripheral surface of the rotor, a stator coil (42) wound around the slots, and a coil end formed by projecting the stator coils in the axial direction of the stator core. (44, 45). The refrigerant supply unit is disposed above the coil end unit, and has a plurality of discharge ports (51, 52, 61, 62, 81, 82) for discharging refrigerant to the coil end unit.

The discharge port has a first discharge port (51, 61, 81) and a second discharge port (52, 62, 82) having different axial positions of the axis (L) of the rotating shaft, and forms a coil end portion. And a stator core (46, 47) extending in a direction intersecting with the axis and having an interval at which adjacent coil wires are arranged in a circumferential direction so that the refrigerant can flow to the lower coil in the gravity direction. When the side is the base end (461, 471) and the tip protruding from the stator core is the tip end (462, 472), one of the first discharge port and the second discharge port (51) is a base end. The stator coil (46), of which the base end is located above the tip in the vertical direction of gravity, is formed so as to discharge toward a portion closer to the base end, and one of the other discharge ends. The outlet (52) has a proximal end and a distal end Relative to the stator coil (47) which towards the tip is positioned above the gravity vertical direction than the proximal end, and is formed so as to discharge toward the site of the tip-sided. When a region including an axis and separated by a vertical plane (M) is defined as a first region (R1) and a second region (R2), one of the first and second discharge ports is the first region. Is formed only at one arbitrary axial position so as to discharge toward, and the other discharge port is formed only at one other axial position different from the arbitrary axial position so as to discharge toward the second region. Have been.

  According to the configuration of the present invention, the refrigerant discharged from any one of the first discharge port and the second discharge port to a portion near the base end of the stator coil moves from top to bottom in the direction of gravity, that is, The stator coil flows from the base end to the tip to cool the coil. On the other hand, the refrigerant discharged from the other one of the first discharge port and the second discharge port to the portion near the front end of the stator coil flows from top to bottom in the direction of gravity, that is, from the front end of the stator coil to the base end. To cool the coil.

  In this way, by disposing the first discharge port and the second discharge port at different axial positions and by allowing the refrigerant to flow through the entire coil end portion from the base end to the distal end of the coil end portion, uniformity is achieved. Cooling can be realized.

FIG. 2 is a cross-sectional view schematically illustrating the rotating electric machine according to the first embodiment of the present invention. It is a perspective view of the whole stator by a 1st embodiment. It is a top view of a stator. It is an enlarged view of a coil end part. It is a perspective view of the whole stator by a 2nd embodiment. It is an enlarged view of a coil end part by a comparative form.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
[Constitution]
The configuration of the first embodiment of the present invention will be described with reference to FIGS. The rotating electric machine 1 of the present embodiment is used, for example, as a motor for a vehicle, and includes a housing 10, a rotating shaft 20, a rotor 30, a stator 40, refrigerant pipes 50, 60, and the like, as shown in FIG. I have. In the following description, the right side in FIG. 1 is described as one side, and the left side is described as the other side.

  The housing 10 includes a pair of a bottomed cylindrical first housing member 11 and a second housing member 12. The first housing member 11 is arranged on the other side in the axial direction, and the second housing member 12 is arranged on one side in the axial direction. The housing 10 is formed by joining the openings of the housing members 11 and 12 together. The rotating shaft 20 is rotatably supported by the housing 10 via bearings 16 and 17 with the axis L aligned in the horizontal direction.

  The rotor 30 is fixed to the rotating shaft 20. A plurality of permanent magnets (not shown) are arranged on the outer periphery of the rotor 30 at a predetermined distance in the circumferential direction. These permanent magnets form a plurality of magnetic poles having different polarities alternately in the circumferential direction.

  The stator 40 is disposed outside the rotor 30 so as to face the rotor 30 in the radial direction. As shown in FIG. 2, the stator 40 has a stator core 41 and a stator coil 42. The stator core 41 is formed in a ring shape by a plurality of electromagnetic steel sheets stacked and fixed in the axial direction. On the inner peripheral side of the stator core 41, a plurality of slots 43 opened in the inner peripheral surface of the stator core 41 and penetrating in the axial direction are arranged at equal intervals in the circumferential direction.

  The stator coil 42 is wound around the stator core 41 with the ends of the plurality of conductor segments inserted into the slots 43 connected to one end of the stator core 41 in the axial direction. More specifically, it is configured by joining the ends on the open end side of a plurality of substantially U-shaped conductor segments by welding.

  A first coil end portion 44 is formed at the other axial end of the stator coil 42, and a second coil end portion 45 is formed at one axial end of the stator coil 42. The first coil end portion 44 is formed by laminating a plurality of turn portions of a conductor segment protruding from the other end surface of the stator core 41 in the radial direction of the stator core 41, and has a ring shape as a whole. The second coil end portion 45 has a plurality of welded joints of the conductor segments protruding from one end surface of the stator core 41 laminated in the radial direction of the stator core 41 to form an annular shape as a whole.

  FIG. 1 is referred to again. In the rotating electric machine 1, refrigerant pipes 50, 60 for cooling the coil end portions 44, 45 of the stator coil 42 are provided at positions above the coil end portions 44, 45 and overlap the axis L in plan view. I have. Each of the refrigerant pipes 50 and 60 corresponds to an example of a “refrigerant supply unit” described in the claims.

  The refrigerant pipes 50 and 60 are attached to the housing members 11 and 12, respectively, so as to communicate between the inside and the outside of the housing 10. The first refrigerant pipe 50 is inserted through the first housing member 11, and the tip is located above the first coil end portion 44. The second refrigerant pipe 60 is inserted through the second housing member 12, and the tip thereof is located above the second coil end 45.

  FIG. 3 is a view taken in the direction of the arrow III in FIG. The refrigerant pipes 50 and 60 have a shape obtained by dividing a cylindrical member in half in the axial direction, and allow a refrigerant to flow from a refrigerant storage tank (not shown). As shown in FIG. 3, a first discharge port 51 and a second discharge port 52 are formed to be open at the end of the first refrigerant pipe 50. 3, the left side is a first area R1, and the right side is a second area R2, in a region separated left and right by a vertical plane M including the axis L and extending vertically.

  First, the stator coil 42 forming the coil end portions 44 and 45 will be described. As shown in FIG. 4, the stator coil 42 forming the coil end portions 44 and 45 extends crossing the axis L and has a wavy shape. Here, attention is paid to the respective coils 46 and 47 forming the conductor segments. For example, when the stator 40 is viewed from the other side of the axis L, the first coil 46 located in the first region R1 on the left side in the circumferential direction from the apex position has a base end 461 and a base end 462 that are the same. Is higher. “Higher” means higher up in the vertical direction of gravity. Further, the stator core 41 side is a base end side, and a tip protruding from the stator core 41 is a front end side.

  On the other hand, in the second coil 47 located in the second region R2 on the right side in the circumferential direction from the vertex position, the distal end 472 is at a higher position between the base end 471 and the distal end 472. That is, which of the base ends 461, 471 and the front ends 462, 472 of the coils 46, 47 forming the conductor segment is located above the vertical direction of gravity differs between the first region R1 and the second region R2.

  The first discharge port 51 is formed at a position where the refrigerant is discharged to a position near the base end 461 of the first coil 46. The second discharge port 52 is formed at a position where the refrigerant is discharged to a position near the tip 472 of the second coil 47. In FIG. 4, the first coil end portion 44 has been described as an example, but the discharge ports 61 and 62 provided in the refrigerant pipe 60 for the second coil end portion 45 have the same configuration, and description thereof will be omitted.

  The rotating electric machine 1 is provided with a recovery unit (not shown) for recovering the liquid refrigerant discharged from the discharge ports 51, 52, 61, 62 and circulating the liquid refrigerant so as to be discharged again from the discharge ports 51, 52, 61, 62. Have been.

[Action]
Next, the operation of the rotating electric machine 1 configured as described above will be described. When the rotating electric machine 1 is started to operate by energizing the stator coil 42 of the stator 40, the rotating shaft 20 rotates with the rotation of the rotor 30, and a driving force is supplied from the rotating shaft 20 to other devices. . At this time, the stator coil 42 generates heat by energizing the stator coil 42. At the same time, the liquid refrigerant is discharged from the discharge ports 51, 52, 61, 62 to the coil end portions 44, 45. The discharged liquid refrigerant flows downward through the coils of the coil end portions 44 and 45, and cools the stator coil 42 that has generated heat by energization.

  Hereinafter, the flow of the refrigerant will be described using the first coil end portion 44 as an example. As shown in FIG. 4, the refrigerant dropped from the first discharge port 51 to a portion near the base end 461 of the first coil 46 flows from the base end 461 of the first coil 46 to the front end 462 as shown by an arrow A1. Run down. The refrigerant discharged from the first discharge port 51 naturally flows also to the base end of the coil adjacent to the left side in the circumferential direction, and similarly flows from the base end of the coil to the front end as shown by arrows A2 and A3. .

  The refrigerant dropped from the second discharge port 52 to a portion near the distal end 472 of the second coil 47 flows down from the distal end 472 of the second coil 47 to the proximal end 471 as shown by an arrow A4. The refrigerant discharged from the second discharge port 52 naturally flows to the distal end of the coil adjacent to the right side in the circumferential direction, and similarly flows from the distal end to the proximal end of the coil as shown by arrows A5 and A6.

[effect]
As described above, according to the rotating electric machine 1 of the present embodiment, the refrigerant dropped on the coil end portions 44 and 45 flows from the proximal end 461 to the distal end 462 in the coil 46 of the first region R1 to the second region R2. In the coil 47, the coil 47 flows from the distal end 472 to the proximal end 471 in the direction of gravity, while cooling the winding.

  For example, as shown in FIG. 6, as a comparative example, a case is considered where the first discharge port 91 and the second discharge port 92 are formed at the same position in the axial direction at a position near the tip of the coil. In this case, in the second region R2, the refrigerant flows from the distal end 472 of the coil 47 toward the base end 471 as shown by the arrow A7, but in the first region R1, the refrigerant flows toward the distal end 462 of the coil 46 as shown by the arrow A8. Only the refrigerant flows only. That is, as shown as a region S, insufficient cooling occurs on the base end 461 side of the coil end portion 44 in the first region R1.

  In this regard, according to the present embodiment, since the refrigerant flows through the entire coil end portions 44 and 45 of the first region R1 and the second region R2 separated by the vertical plane M, uniform cooling can be realized. it can. When the rotating electric machine 1 is mounted on a vehicle, the axis L of the rotating shaft 20 is shifted from the horizontal direction according to a traveling state such as traveling on a slope. However, the influence of the temporary inclination of the rotary shaft 20 is negligible within a general traveling range, and the coil end portions 44 and 45 can be cooled well.

<Second embodiment>
Next, a rotating electric machine according to a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The second embodiment is different from the rotary electric machine 1 of the first embodiment in that a gutter member 80 connected to a refrigerant pipe 70 is provided. Similarly to the first refrigerant pipe 50 of the first embodiment, the refrigerant pipe 70 is provided at a position above the first coil end portion 44 and overlapping the axis L in plan view. The refrigerant pipe 70 and the gutter member 80 correspond to an example of a “refrigerant supply unit” described in the claims.

  As shown in FIG. 5, the gutter member 80 is provided above and spaced apart from the first coil end portion 44 and has an arc shape that is upwardly convex so as to extend along the outer periphery of the first coil end portion 44. ing. The gutter member 80 is formed with a plurality of (three in this embodiment) first discharge ports 81 and a plurality of (three in this embodiment) second discharge ports 82. As in the first embodiment, the first discharge port 81 is formed at a position where the refrigerant is discharged to a position near the base end of the coil in the first region R1. The second discharge port 82 is formed at a position where the refrigerant is discharged to a portion of the second region R2 near the end of the coil.

  According to the present embodiment, the same effect as that of the first embodiment is obtained, and the refrigerant is discharged over a long distance in the circumferential direction by the gutter member 80. It is possible to reliably cool the end portion 44 as well. In FIG. 5, the refrigerant pipe 70 and the gutter member 80 are provided so as to correspond to the first coil end part 44, but the same refrigerant pipe and gutter member are provided in the second coil end part 45. Is also good.

<Other embodiments>
In the above embodiments, the discharge pipes 51, 52, 61, 62, 81, and 82 are provided in the refrigerant pipes 50, 60, and 70 and the gutter member 80. However, separate pipes may not be provided. For example, a coolant flow path penetrating the inside of the housing 10 may be formed in the housing 10, and a discharge port communicating with the coolant flow path and opening downward may be provided. In this case, the coolant passage formed in the housing 10 corresponds to a “coolant supply unit” described in the claims.

  In the first embodiment, the first refrigerant pipe 50 and the second refrigerant pipe 60 are formed of different members, but may be formed of one common pipe member extending in the axial direction. Also, the shape of each of the refrigerant pipes 50 and 60 may be various as long as it can supply the refrigerant.

  In the first embodiment, one refrigerant pipe 50, 60 is provided at a position overlapping the axis L in a plan view. In addition, a plurality of refrigerant pipes may be provided at a position not overlapping the axis L. .

  In the above embodiments, the first discharge ports 51 and 61 are formed so as to discharge to the coil 46 in the first region R1, and the second discharge ports 52 and 62 are formed so as to discharge to the coil 47 in the second region R2. The discharge ports 51, 52, 61, 62 may all be on the vertical plane M. Each of the discharge ports 51, 52, 61, 62 corresponds to a portion located above the coil forming the conductor segment in the vertical direction of gravity, and the first discharge ports 51, 61 and the second discharge port 52, It suffices if the axial positions of 62 are different.

  In each of the above embodiments, the stator coil 42 forming the coil end portions 44 and 45 has a wave shape. However, the shape is not limited to the wave shape and may be another shape such as a straight shape.

  The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Rotating electric machine 20 ... Rotating shaft 30 ... Rotor 40 ... Stator 41 ... Stator cores 42, 46, 47 ... Stator coil 43 ... Slot 44 ... 1st coil end Part 45: second coil end part 50: first refrigerant pipe (refrigerant supply part)
51, 61 1st discharge port 52, 62 2nd discharge port 60 2nd refrigerant pipe (refrigerant supply part)
R1 first region R2 second region L axis

Claims (3)

A rotor (30) rotatable about a rotation axis (20) extending in the horizontal direction;
A stator core (41) having a plurality of slots (43) facing the peripheral surface of the rotor, stator coils (42, 46, 47) wound around the slots, and the stator coils protruding in the axial direction of the stator core; A stator (40) having a coil end portion (44, 45) formed and disposed radially outside the rotor;
A refrigerant supply unit (50, 60, 70, 80) disposed above the coil end unit and having a plurality of discharge ports (51, 52, 61, 62, 81, 82) for discharging refrigerant to the coil end unit; When,
A rotating electric machine having
The discharge port has a first discharge port (51, 61, 81) and a second discharge port (52, 62, 82) having different axial positions of the axis (L) of the rotating shaft,
The stator coil which forms the coil end portion , extends in a direction intersecting the axis, and is arranged at an interval at which adjacent coil wires can flow refrigerant to a lower coil in a gravity direction in a circumferential direction. In (46, 47), when the stator core side is a base end (461, 471) and a tip protruding from the stator core is a front end (462, 472),
One of the discharge ports (51) of the first discharge port and the second discharge port is provided with respect to the stator coil (46) whose base end is located above the front end in the direction of gravity. It is formed so as to discharge toward the part near the base end,
The other discharge port (52) is formed so as to discharge toward the portion near the distal end with respect to the stator coil (47) whose distal end is located above the proximal end in the direction of gravity. ,
When a region including the axis and separated by a vertical surface (M) is defined as a first region (R1) and a second region (R2), with respect to the coil end portion protruding to one side in the axial direction, One of the first discharge port and the second discharge port is formed only at one arbitrary axial position so as to discharge toward the first region, and the other discharge port is directed toward the second region. A rotating electrical machine that is formed only at one other axial position different from the arbitrary axial position so as to perform discharge . The coolant supply unit, rotating electric machine according to claim 1 refrigerant Ru comprising piping (50, 60, 70) provided at a position overlapping with the axis in plan view at a distance above the coil end portion.   The said refrigerant supply part is provided with the said discharge opening, and is provided with the gutter member (80) formed so that it may extend along the circumference direction of the said coil end part in the axial direction one end side of the said rotating shaft. Item 3. The rotating electric machine according to item 2.

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