JP2020065378A - Rotary electric machine and vehicle having rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of uniformly receiving cooling oil into a stator, and a vehicle having the rotary electric machine.SOLUTION: A rotary electric machine 11 has receiving ports 30 receiving oil into a stator 12 from an outside of the stator 12, an annular circumferential direction passage 31 connected to the receiving ports 30 and extending in a circumferential direction of the stator 12, and a plurality of axial direction passages 32 connected to the circumferential direction passage 31 and extending in an axial direction of the stator 12. A cross sectional area of a connection portion 33 from the circumferential direction passage 31 to a plurality of axial direction passages 32 becomes larger as it separates from the receiving port 30 in the circumferential direction of the stator 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electric machine and a vehicle including the rotating electric machine.

The hybrid vehicle is equipped with an engine (internal combustion engine) and a traveling motor as traveling power sources, and realizes highly efficient traveling by appropriately using both or one of them. For example, by using the engine exclusively when cruising on a highway or the like, and by using both the engine and the traveling motor when accelerating or climbing a hill, good fuel economy and high running performance are achieved. ing.
In a hybrid vehicle having a generator and an electric motor, cooling of the stator side coil is performed by dripping a refrigerant such as ATF (Automatic Transmission Fluid) that also serves as gear lubrication of the transmission onto the stator side coil of the generator and the electric motor. Is being done.

  Patent Document 1 describes an oil-cooled motor in which oil is guided to an ejection port through an oil passage formed inside the magnetic pole core, and the ejection port is opened on the inner surface of the coil of the core. The oil-cooled motor described in Patent Document 1 has a plurality of ejection ports, the oil passage is arranged in the circumferential direction, and the oil branched from the circumferential direction is guided to the plurality of ejection ports. .

JP, 2009-240113, A

  In the oil-cooled motor described in Patent Document 1, a plurality of cooling holes are formed in the stator in order to improve the cooling performance of the motor. However, if a plurality of cooling holes are opened in the circumferential direction with respect to one inflow port, the inflow amount of each cooling hole will not be uniform. If the inflow rate is not uniform, the bottleneck will be where the flow rate is the lowest, that is, where the temperature is the highest. The operation of the motor will be adjusted to the temperature there.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a rotating electric machine and a vehicle including the rotating electric machine that can uniformly insert the cooling oil into the stator.

  In order to solve the above problems, the rotating electric machine according to claim 1 includes a rotor and a stator, and the stator is connected to an intake port for taking oil from the outside of the stator into the inside of the stator, and the intake port. An annular first oil passage extending in the circumferential direction of the stator and a plurality of second oil passages connected to the first oil passage and extending in the axial direction of the stator are formed. In the rotating electrical machine, the connecting portion from the first oil passage to the plurality of second oil passages has a cross-sectional area that increases as the distance from the intake port in the circumferential direction of the stator increases.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle provided with the rotary electric machine and the rotary electric machine which can put cooling oil uniformly in a stator can be provided.

It is a perspective view of the rotary electric machine which concerns on one Embodiment of this invention. It is a cross-sectional view of a central portion of the rotary electric machine according to the above embodiment. FIG. 3 is a right-side cross-sectional view of the rotary electric machine shown in FIG. 2. It is a perspective view which stored the rotary electric machine concerning the above-mentioned embodiment in the housing. It is a side view which removes the housing of the rotary electric machine which concerns on the said embodiment, and exposes the winding of a stator. It is a figure explaining the cross-sectional area of the connection part of the stator of the rotary electric machine which concerns on the said embodiment, (a) is a figure which expands and represents the periphery of the stator with which the rotary electric machine shown in FIG. 2 is shown, (b) is a connection part. And (c) is an explanatory view for sequentially enlarging the cross-sectional area of the oil passage of the connection portion.

Hereinafter, a rotary electric machine according to an embodiment of the present invention and a vehicle including the rotary electric machine will be described in detail with reference to the drawings as appropriate. In each drawing, common parts are denoted by the same reference numerals, and redundant description will be omitted. Further, the size and shape of the members may be schematically or modified or exaggerated for convenience of description.
(Embodiment)
FIG. 1 is a perspective view of a rotary electric machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the central portion of the rotary electric machine 11 shown in FIG. FIG. 3 is a right-hand cross-sectional view of the rotary electric machine 11 shown in FIG. FIG. 4 is a perspective view of the rotary electric machine 11 shown in FIG. 1 housed in a housing 40 (case). FIG. 5 is a side view showing the winding of the stator by removing the housing of the rotary electric machine 11 shown in FIG.
The rotary electric machine 11 according to the present embodiment is, for example, a thin motor mounted on a hybrid vehicle (vehicle).

As shown in FIG. 1, a rotary electric machine 11 according to the present embodiment is arranged such that an annular stator 12 having a stator core 21 and windings provided on the stator core 21, and an inner peripheral surface of the stator 12 face each other with a gap therebetween. And an annular rotor (not shown).
As shown in FIGS. 4 and 5, the stator 12 is fixed (press fitted) to the inner wall of the inner peripheral surface 40 a of the housing 40. As shown in FIG. 5, the housing 40 is provided with an inflow hole 41 to which cooling oil is supplied from a pump (not shown) through a refrigerant supply pipe (not shown).

As shown in FIG. 1, the stator 12 includes a stator core 21 formed in a cylindrical shape as a whole, and a plurality of magnetic pole core portions 22 extending radially inward from the outer peripheral portion of the stator core 21 in a toothed manner. A plurality of slots 23 defined by the formation of the magnetic pole core portion 22, a stator coil 24 (winding) wound around the magnetic pole core portion 22 and accommodated in the plurality of slots 22, and a space of the stator coil 24. The heat transfer member 25 that is inserted into the housing 40 to release heat from the stator coil 24 to the housing 40, the annular coil cover 26 that covers the axial end of the stator coil 24 and its crossing portion, and the heat transfer member 25. 11, a snap ring 27 (see FIG. 4) that is pressed in the radial direction.
The stator core 21 is configured, for example, by stacking a plurality of annular electromagnetic steel plates in the axial direction.

  As shown in FIG. 4, the heat transfer member 25 includes a first surface portion 251, a second surface portion 252 facing the first surface portion 251, and a curved surface portion that connects the first surface portion 251 and the second surface portion 252 in a semicircular shape. 253, and a protruding portion 254 provided at one end of the curved surface portion 253 in the length direction and protruding from the end portions of the first surface portion 251 and the second surface portion 252.

<Oil passage>
As shown in FIGS. 1 and 2, a first intake port 30a and a second intake port 30b for taking cooling oil from the outside of the stator 12 into the inside of the stator 12 through the inflow hole 41 of the housing 40 are provided on the outer periphery of the stator 12. (In this embodiment, the stator 12 has two openings, an upper portion and a lower portion).
The first intake port 30a and the second intake port 30b are collectively referred to as the intake port 30. As shown in FIGS. 1 and 2, the intake port 30 is formed by a groove portion that extends in the circumferential direction on the outer peripheral portion of the stator 12.

As shown in FIG. 5, in the stator 12, an annular circumferential oil passage 31 (first oil passage), which is connected to the intake port 30 and extends in the circumferential direction of the stator 12, and a circumferential oil passage. 31 and a plurality of axial oil passages 32 (second oil passages) that extend in the axial direction of the stator 12 and oil passage openings connected from the circumferential oil passage 31 to the plurality of axial oil passages 32. And a connection portion 33 that becomes In the plurality of axial oil passages 32, the cross-sectional area of the connection portion 33 (opening) connected from the circumferential oil passage 31 to the axial oil passage 32 increases as the distance from the intake 30 in the circumferential direction of the stator 12 increases ( Details will be given later).
The circumferential oil passage 31 is composed of a groove formed on the outer circumference of the stator 12. However, other oil passage forming methods are possible. For example, the groove may be formed in the inner wall surface of the cylindrical portion 40a of the housing 40.

It should be noted that the cooling oil sent to the plurality of axial oil passages 32 branches radially inward from the axial oil passages 32 and extends into the magnetic pole core portion 22 in a radial oil passage (not shown). From there, it branches to the left and right (both) and reaches the jet oil passage (not shown). Each of the jet oil passages opens on a side wall of the magnetic pole core portion 22 and serves as a jet port (not shown).
A stator coil 24 is wound around each magnetic pole core portion 22, and there is a predetermined gap between the stator coil 24 and the opening (jet port) of the jet oil passage, and the cooling oil flows from each jet port. It flows out and out of the gap between the stator coil 24 and the magnetic pole core portion 22.

[Structure of stator 12]
<Arrangement of connection part 33>
The configuration of the stator 12 will be described in more detail.
As shown in FIGS. 1 and 5, the rotary electric machine 11 has an intake port 30 for introducing oil into the stator 12, and an annular circumferential direction that is connected to the intake port 30 and extends in the circumferential direction of the stator 12. A channel 31 (first oil passage), a plurality of axial passages 32 (second oil passages) connected to the circumferential passage 31 and extending in the axial direction of the stator 12, and a circumferential oil passage. A connecting portion 33 (hereinafter, referred to as a “connecting portion 33”) that serves as an oil passage (opening to the axial passage 32) connected from 31 to the plurality of axial oil passages 32.
As shown in FIGS. 2 and 3, the plurality of connecting portions 33 are configured such that the cross-sectional area S thereof increases as the distance from the intake 30 increases in the circumferential direction of the stator 12.

More specifically, as shown in FIG. 3, the connection part 33 ₁ closest to the first intake port 30a, the connection part 33 ₂ closest to the first intake port 30a, ..., The connection part 33 _(further away from the first intake port 30a _{). n)} is arranged, and the cross-sectional area S of the oil passage of the connection portions 33 ₁ , 33 ₂ , ..., 33 _(n) is changed to S ₍₁₎ , S ₍₂₎ , ..., S _(n) and the intake port. The larger the distance from 30 in the circumferential direction of the stator 12, the larger. However, n is the number of outlets between the oil inlets.

Similarly, the connection part 33 ₁ closest to the second intake port 30 b, the connection part 33 ₂ next closest to the second intake port 30 b, the connection part 33 _(n) farthest from the second intake port 30 a are arranged, and the connection part 33 _{1, 33} 2, ..., the cross-sectional area S of the oil passage _{33 (n), S (1} ), S (2), ..., and _{S (n),} away from the inlet 30 in the circumferential direction of the stator 12 In accordance with the above, it is gradually increased.

  A boundary is provided at an intermediate point of the circumferential flow path 31 between the first intake port 30a and the second intake port 30b, and the cross-sectional area of the connection part 33 on the boundary part or closest to the boundary part is The largest.

<Cross-sectional area S of connecting portion 33>
Connecting portion 33, connecting portions _{33 1, 33 2, ...,} 33 (n-1), 33 in the order of _(n), the cross-sectional area of the oil passage (opening into the axial channels 32) _{S (1), S (2)} , ..., S _(n-1) , S _(n) are configured to be large. 2 and 3, assuming that the number of outlets between the two inlets 30, that is, the first inlet 30a and the second inlet 30b is n, the cross-sectional area S is expressed by the following equation (1). It is represented by.

S ₍₁₎ ≤ S ₍₂₎ , ..., ≤ S _{(n / 2)} ... (1)

Next, a specific method of sequentially increasing the cross-sectional area S will be described.
FIG. 6 is a diagram for explaining the cross-sectional area S of the connecting portion 33, FIG. 6 (a) is an enlarged view showing the periphery of the stator 12 provided in the rotating electric machine 11 shown in FIG. 2, and FIG. 6 (b) is FIG. 6C is an enlarged view of the connecting portion 33, and FIG. 6C is an explanatory view in which the cross-sectional area S of the oil passage of the connecting portion 33 is sequentially enlarged.

  As shown in FIG. 5, the circumferential oil passage 31 (first oil passage) is arranged in the circumferential direction of the stator 12, and the axial passage 32 (second oil passage) is in the axial direction of the stator 12. It is arranged in the oil passage 32. In addition, the axial oil passage 32 is a radial oil passage (not shown) extending into the magnetic pole core portion 22 (see FIG. 1), and further branched left and right (both) from there to a jet outlet oil passage (not shown). ). Therefore, the connecting portion 33, which is an oil passage connected from the circumferential oil passage 31 to the plurality of axial oil passages 32, corresponds to the arrangement position and the number of the stator coils 24. That is, each connecting portion 33 is limited above the stator coil 24 (on the outer peripheral side) and by the width of the base portion of the stator coil 24. Under this condition, as shown in FIG. 6B, when enlarging the cross-sectional area S of the oil passage of the connecting portion 33, the width of the oil passage of the connecting portion 33 is fixed and the height is increased. As described above, the method of fixing the width and increasing only the height has an advantage that the number of manufacturing steps does not increase and the processing is easy.

  However, any configuration may be used as long as the cross-sectional area S is changed according to the above equation (1). For example, (1) changing the "width" in addition to the "height", (2) adding a rectangular or dome-shaped groove for changing the cross-sectional area S to the connecting portion 33, (3) connecting portion 33 There is a method in which the upper part (outer peripheral side) of the is formed into a dome shape and its R is changed.

Hereinafter, a method of cooling the stator 12 of the rotary electric machine 11 configured as described above will be described.
As shown in FIG. 5, the cooling oil is supplied from the pump (not shown) to the inflow hole 41 of the housing 40 through the refrigerant supply pipe (not shown).
The cooling oil that has flowed in from the inflow hole 41 of the housing 40 flows inward from the first intake port 30a and the second intake port 30b provided on the outer periphery of the stator 12, as shown by the arrow a in FIG.

  The first intake port 30a and the second intake port 30b are connected to an annular circumferential oil passage 31 (first oil passage) extending in the circumferential direction of the stator 12. The cooling oil that has flowed into the first intake port 30a and the second intake port 30b flows in the first intake port 30a in the circumferential direction of the stator 12 by the circumferential oil passage 31, as shown by the arrow b in FIG. And it is sent to the position farthest from the second intake port 30b. The circumferential oil passage 31 is connected to the axial oil passage 32 extending in the axial direction through each connection portion 33. As shown by the arrow c in FIGS. 4 and 5, the cooling oil that has passed through the circumferential oil passage 31 is axially distributed through the connection portion 33.

  As described above, the connecting portion 33 is configured such that the cross-sectional area S increases as the distance from the intake 30 in the circumferential direction of the stator 12 increases. With this configuration, the inflow amount of the cooling oil flowing into the axial oil passage 32 through the connection portion 33 close to the intake port 30 and the inflow of the cooling oil flowing into the axial oil passage 32 through the connection portion 33 separated from the intake port 30. The amount is almost uniform. Since the flow rate of the cooling oil flowing into each axial oil passage 32 is substantially uniform, the temperature of the cooling oil of each stator coil 24 facing each axial oil passage 32 is also uniform. Therefore, conventionally, it is possible to avoid a bottleneck where the flow rate is the smallest, that is, where the temperature is the highest, and it is possible to improve the cooling performance of the entire rotary electric machine 11.

  The cooling oil sent to each axial oil passage 32 branches radially inward from the axial oil passage 32 and extends into the magnetic pole core portion 22 in a radial oil passage (not shown). It branches to (both) and reaches the jet oil passage (not shown). Each of the jet oil passages opens on a side wall of the magnetic pole core portion 22 and serves as a jet port (not shown). The ejection port oil passages are opened to the side walls of the magnetic pole core portion 22 to serve as ejection ports. The cooling oil flows out from each of the ejection ports, flows out from the gap between the stator coil 24 and the magnetic pole core portion 22, and can cool the stator 12 and the rotary electric machine 11 including the stator 12.

  As described above, the rotary electric machine 11 according to the present embodiment is connected to the intake port 30 for introducing oil from the outside of the stator 12 into the stator 12, and is connected to the intake port 30 and extends in the circumferential direction of the stator 12. An annular circumferential flow passage 31 and a plurality of axial flow passages 32 that are connected to the circumferential flow passage 31 and extend in the axial direction of the stator 12 are provided. The connecting portion 33 to the flow path 32 has a cross-sectional area that increases as the distance from the inlet 30 increases in the circumferential direction of the stator 12.

  With this configuration, the cooling oil can be uniformly introduced into the stator 12 from any hole on the outer peripheral surface of the stator 12. Conventionally, it is possible to avoid the bottleneck portion where the flow rate is the smallest, and it is possible to improve the cooling performance of the entire rotary electric machine 11.

  Further, in the present embodiment, the connecting portion 33 increases the cross-sectional area by increasing the height with increasing distance from the intake port 30 in the circumferential direction of the stator 12. Thereby, the cooling oil can be uniformly introduced into the stator 12 through any of the holes on the outer peripheral surface of the stator 12, and the cooling performance of the entire rotary electric machine 11 can be improved.

  In addition, in the present embodiment, the intake port 30 has a first intake port 30a and a second intake port 30b, and the second intake port 30b is of the stator 12 with respect to the first intake port 30a. It is arranged on the opposite side in the radial direction. Thereby, the cooling oil can be uniformly introduced into the stator 12 through any of the holes on the outer peripheral surface of the stator 12, and the cooling performance of the entire rotary electric machine 11 can be improved.

  Further, in the present embodiment, a boundary portion is provided at an intermediate point of the circumferential flow path 31 between the first intake port 30a and the second intake port 30b, and is located on the boundary part or closest to the boundary part. The cross-sectional area of the connecting portion 33 is the largest. Thereby, the cooling oil can be uniformly introduced into the stator 12 through any of the holes on the outer peripheral surface of the stator 12, and the cooling performance of the entire rotary electric machine 11 can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents of this specification.
Further, the rotary electric machine 11 according to the present invention may be a hybrid vehicle, an electric vehicle that does not have an engine and uses only a motor as a drive source, or a fuel cell vehicle.

11 rotating electric machine 12 stator 21 stator core 22 magnetic pole core part 23 slot 24 stator coil (winding)
25 heat transfer member 26 coil cover 27 snap ring 30 intake port 30a first intake port 30b second intake port 31 circumferential oil passage (first oil passage)
32 axial oil passage (second oil passage)
_{33,33 1, 33 2, ...,} 33 (n-1), 33 (n) connecting portion 40 housing (case)
41 Inflow hole

Claims (5)

With rotor and stator,
The stator has an intake port for taking oil from the outside of the stator into the inside of the stator,
An annular first oil passage connected to the intake port and extending in the circumferential direction of the stator,
A plurality of second oil passages connected to the first oil passage and extending in the axial direction of the stator are formed,
The rotating electrical machine according to claim 1, wherein the connecting portion from the first oil passage to the plurality of second oil passages has a cross-sectional area that increases with increasing distance from the intake port in the circumferential direction of the stator.   The rotating electrical machine according to claim 1, wherein the connecting portion increases the height as the distance from the inlet increases in the circumferential direction of the stator, thereby increasing the cross-sectional area.   The intake port has a first intake port and a second intake port, and the second intake port is arranged on the opposite side of the stator in the radial direction with respect to the first intake port. The rotating electrical machine according to claim 1 or 2, wherein:   A boundary part is provided at the intermediate point of the first oil passage between the first intake port and the second intake port, and a disconnection of the connection part on the boundary part or closest to the boundary part. The rotary electric machine according to claim 1, which has the largest area. A vehicle equipped with a rotating electric machine comprising the rotating electric machine according to any one of claims 1 to 4 as a drive source.

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