rotating electrical machines

Abstract

To provide a rotary electric machine which can be miniaturized while sufficiently cooling a stator core, and a coil, etc.SOLUTION: A rotary electric machine comprises: a stator core having a slot for housing a coil; and a heat dissipation member arranged in the slot. The heat dissipation member comprises: a heat transfer part arranged between the stator core and the coil in the slot to extend in a direction of a rotational axis; and a heat dissipation part integrally formed with the heat transfer part. The heat dissipation part comprises at least one of a first heat dissipation part, a second dissipation part, and a third dissipation part. The first heat dissipation part extends in a radial direction of the stator core outside the slot to cover an end surface of the stator core orthogonal to the rotational axis. The second heat dissipation part extends on one side in a circumferential direction of the stator core outside the slot to cover the end surface of the stator core orthogonal to the rotational axis. The third heat dissipation part extends on the other side in the circumferential direction of the stator core outside the slot to cover the end surface of the stator core orthogonal to the rotational axis.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] Rotating electric machines such as motors and generators can sometimes be difficult to operate efficiently due to factors such as heat generated by coils during operation. For this reason, technologies for cooling the interior of rotating electric machines have been developed. Examples of such technologies include the motors disclosed in Patent Document 1 and Patent Document 2.

[0003] The motor disclosed in Patent Document 1 includes a heat dissipation layer that conducts heat generated in the coil to the outside. The motor disclosed in Patent Document 2 includes a stator core, an inner housing, an outer housing, and a thermally conductive sheet. The inner housing and the outer housing are arranged around the stator core and form a refrigerant passage through which a refrigerant flows. The thermally conductive sheet has a heat absorption portion that is arranged in contact with the stator core and a heat dissipation portion that is arranged in contact with the inner housing and the outer housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-319590 [Patent Document 2] Japanese Patent Application Publication No. 2018-113750 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the motor disclosed in Patent Document 1 has insufficient cooling performance because the heat dissipation layer is provided only between the coils, and the motor disclosed in Patent Document 2 has a thermally conductive sheet that extends parallel to the central axis from the inside to the outside of the slot, which results in an increase in size at least in the direction of the central axis.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotating electric machine that can be made smaller while still being able to sufficiently cool the stator core, coils, etc. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a rotating electric machine of the present invention includes a stator core having slots that accommodate coils, and a heat dissipation member disposed in the slots. The heat dissipation member is disposed within the slots between the stator core and the coils, and includes a heat transfer portion extending in the direction of the rotation axis, and a heat dissipation portion formed integrally with the heat transfer portion. The heat dissipation portion includes at least one of a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion. The first heat dissipation portion extends in the radial direction of the stator core outside the slots and covers an end face of the stator core perpendicular to the rotation axis. The second heat dissipation portion extends on one side of the circumferential direction of the stator core outside the slots and covers the end face of the stator core perpendicular to the rotation axis. The third heat dissipation portion extends on the other side of the circumferential direction of the stator core outside the slots and covers the end face of the stator core perpendicular to the rotation axis.

[0008] The rotating electric machine of the present invention may further include a first heat dissipation member disposed in a first slot and including the third heat dissipation portion, and a second heat dissipation member disposed in a second slot adjacent to the first slot on one circumferential side, and including the second heat dissipation portion. In this case, the third heat dissipation portion of the first heat dissipation member and the second heat dissipation portion of the second heat dissipation member include portions that overlap in the circumferential direction and are spaced apart in the direction of the rotation axis.

[0009] The rotating electric machine of the present invention may further include a first heat dissipation member disposed in a first slot and including the third heat dissipation portion, and a second heat dissipation member disposed in a second slot adjacent to the first slot on one circumferential side thereof and including the second heat dissipation portion. In this case, the third heat dissipation portion of the first heat dissipation member and the second heat dissipation portion of the second heat dissipation member include portions that do not overlap in the circumferential direction and are disposed at the same height in the direction of the rotation axis.

[0010] The first heat dissipation member may extend in a radial direction to an end of an end surface of the stator core that is perpendicular to the rotation axis.

[0011] Furthermore, at least one of the heat transfer portion, the first heat dissipation portion, the second heat dissipation portion, and the third heat dissipation portion may be made of a material having a higher thermal conductivity than the material constituting the stator core.

[0012] Furthermore, at least a portion of the surfaces of the first heat dissipation portion, the second heat dissipation portion, and the third heat dissipation portion that face the end face of the stator core perpendicular to the rotation axis may be in close contact with the end face of the stator core perpendicular to the rotation axis. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a rotating electric machine that can be made smaller while still being able to sufficiently cool the stator core, coils, etc. [Brief explanation of the drawings]

[0014] [Figure 1] 2 is a cross-sectional view showing an example of a stator core, a rotor, a shaft, and a heat dissipation portion of the motor according to the first embodiment. FIG. [Figure 2] 3 is a cross-sectional view showing an example of the internal structure of a slot formed in the stator core according to the first embodiment. FIG. [Figure 3] 3A to 3C are diagrams illustrating an example of a heat dissipation section and a structure around the heat dissipation section according to the first embodiment. [Figure 4]4A to 4C are diagrams illustrating an example of the positional relationship between a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion and an end face of a stator core according to the first embodiment. [Figure 5] 10A to 10C are diagrams illustrating examples of a stator core, a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion according to a second embodiment. [Figure 6] 10A to 10C are diagrams illustrating examples of a stator core, a heat transfer portion, a second heat dissipation portion, and a third heat dissipation portion according to a second embodiment. [Figure 7] 11A to 11C are diagrams illustrating examples of a stator core, a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion according to a third embodiment. [Figure 8] 10A and 10B are diagrams illustrating an example of a first heat dissipation section according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the first to fourth embodiments, a motor will be described as an example of a rotating electric machine. This motor is mounted on an electric vehicle, for example, to rotate the wheels of the electric vehicle. In the following description, an X-axis parallel to the rotation axis of the motor, a Y-axis perpendicular to the X-axis, and a Z-axis perpendicular to the X-axis and Y-axis are used. The X-axis, Y-axis, and Z-axis form a right-handed system. The Z-axis is parallel to the direction in which gravity is applied.

[0016] (First embodiment) 1 is a cross-sectional view showing an example of a stator core, a rotor, a shaft, and a heat dissipation portion of a motor according to a first embodiment. As shown in FIG. 1, the motor according to the first embodiment includes a stator 1a, a rotor 2, and a shaft 3.

[0017] The stator 1a is a cylindrical member into which the rotor 2 and shaft 3 are inserted. The rotor 2 is a cylindrical member that rotates around a rotation axis A that is parallel to the X-axis. The shaft 3 is a rod-shaped member that supports the rotor 2 in a manner that allows the rotor 2 to rotate around the rotation axis A.

[0018] Fig. 2 is a cross-sectional view showing an example of the internal structure of a slot formed in a stator core according to the first embodiment. The stator 1a includes a stator core 11a shown in Figs. 1 and 2, a coil 12 shown in Fig. 2, and a heat dissipation member 4a shown in Figs. 1 and 2.

[0019] The stator core 11a is a cylindrical member with multiple teeth and slots formed inside. The teeth are portions of the stator core 11a that extend toward the rotation axis A, and their longitudinal directions are parallel to the rotation axis A. The slots are spaces sandwiched between two adjacent teeth in the circumferential direction of a circle centered on a point on the rotation axis A and located on a plane parallel to the YZ plane.

[0020] 2, the coil 12 is housed inside the slot 110a. Coils are also housed inside slots other than the slot 110a. When current is applied to the coil 12 and the like, they generate a magnetic force that rotates the rotor 2 around the rotation axis A.

[0021] The heat dissipation member 4a is disposed in the slot 110a. The heat dissipation member 4a is made of a material with a higher thermal conductivity than the material constituting the stator core 11a, and has an insulating coating applied to its surface. Examples of materials constituting the heat dissipation member 4a include gold, silver, copper, aluminum, and graphite. The heat dissipation member 4a may also be made of the same material as the coil 12. For example, if the coil 12 is made of oxygen-free copper, the heat dissipation member 4a may also be made of oxygen-free copper. In this case, magnetic field disturbance caused by the heat dissipation member 4a is suppressed, and a decrease in energy conversion efficiency can be suppressed.

[0022] Examples of materials used for insulating coating include resin-based treatment solutions containing at least one of molybdenum disulfide and tungsten disulfide blended with resin varnish. Other examples of materials used for insulating coating include bisphenol A epoxy resin, cresol / novolac epoxy resin, or a mixture of aluminum-containing oxides. Other examples of materials used for insulating coating include coating solutions of alkali metal polyphosphates or alkali metal disilicates.

[0023] The heat dissipation member 4a includes the heat transfer portion 5 shown in FIG. 2 and the heat dissipation portion 6a shown in FIGS. 1 and 3. As shown in FIG. 2, the heat transfer portion 5 is disposed between the stator core 11a and the coil 12 within the slot 110a. Specifically, the cross-sectional shape of the heat transfer portion 5 taken along a plane perpendicular to the rotation axis A conforms to the cross-sectional shape of the inside of the slot 110a taken along the plane perpendicular to the rotation axis A. The cross-sectional shape of the heat transfer portion 5 taken along a plane perpendicular to the rotation axis A is uniform throughout the entire area along the rotation axis A. The heat transfer portion 5 is fabricated, for example, by bending the +Y direction side and the −Y direction side of a plate toward the +Z direction along a line parallel to the X axis. Preferably, the heat transfer portion 5 is disposed in all slots formed in the stator core 11a.

[0024] The heat transfer portion 5 is adhered to the inner wall of the slot 110a by an adhesive layer 71. The adhesive layer 71 is an adhesive layer formed between the slot 110a and the heat transfer portion 5. As shown in FIG. 2 , an adhesive layer 72, an insulating layer 8, and an adhesive layer 73 are formed between the heat transfer portion 5 and the coil 12. The adhesive layer 72 is an adhesive layer formed between the heat transfer portion 5 and the insulating layer 8 to bond the heat transfer portion 5 and the insulating layer 8. The insulating layer 8 is an insulating material layer formed to suppress the occurrence of a leakage current from the coil 12 to the stator core 11a. The adhesive layer 73 is an adhesive layer formed between the insulating layer 8 and the coil 12 to bond the insulating layer 8 and the coil 12.

[0025] It is preferable that the adhesive layer 71 has a thickness and is made of a material that does not impede the transfer of heat from the stator core 11a to the heat transfer portion 5. It is also preferable that the adhesive layer 72, the insulating layer 8, and the adhesive layer 73 all have a thickness and are made of a material that does not impede the transfer of heat from the coil 12 to the heat transfer portion 5.

[0026] 3 is a diagram illustrating an example of the heat dissipation portion and its surrounding structure according to the first embodiment. The heat dissipation portion 6a is formed integrally with the heat transfer portion 5, and includes a first heat dissipation portion 61a, a second heat dissipation portion 62a, and a third heat dissipation portion 63a exposed from an end surface 115a of the stator core 11a perpendicular to the rotation axis A.

[0027] The first heat dissipation portion 61a extends in the radial direction of the stator core 11a outside the slot 110a and covers an end face 115a of the stator core 11a that is perpendicular to the rotation axis A. The first heat dissipation portion 61a is produced, for example, by bending the end of the heat dissipation member 4a in the direction of the rotation axis A toward the -Z direction along a line parallel to the Y axis.

[0028] The second heat dissipation portion 62a extends outside the slots 110a on one circumferential side of the stator core 11a and covers an end face 115a of the stator core 11a that is perpendicular to the rotation axis A. The one circumferential side here refers to the clockwise side when the stator 1a is viewed from the +X direction. The second heat dissipation portion 62a is produced, for example, by bending the end of the heat dissipation member 4a in the direction of the rotation axis A toward the -Y direction along a line parallel to the Z axis.

[0029] The third heat dissipation portion 63a extends outside the slots 110a toward the other circumferential side of the stator core 11a and covers an end face 115a of the stator core 11a that is perpendicular to the rotation axis A. The other circumferential side here refers to the counterclockwise side when the stator 1a is viewed from the +X direction. The third heat dissipation portion 63a is produced, for example, by bending the end of the heat dissipation member 4a in the direction of the rotation axis A toward the +Y direction along a line parallel to the Z axis.

[0030] 4 is a diagram illustrating an example of the positional relationship between the first heat dissipation portion, the second heat dissipation portion, and the third heat dissipation portion and the end face of the stator core according to the first embodiment. As illustrated in FIG. 4, the entire surfaces of the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a facing the end face 115a of the stator core 11a are in close contact with the end face 115a of the stator core 11a. Specifically, the entire surface of the first heat dissipation portion 61a facing the −X direction is in close contact with the end face 115a of the stator core 11a. Similarly, the entire surface of the second heat dissipation portion 62a facing the −X direction is in close contact with the end face 115a of the stator core 11a. Furthermore, the entire surface of the third heat dissipation portion 63a facing the −X direction is in close contact with the end face 115a of the stator core 11a.

[0031] Next, heat conduction by the heat transfer unit 5 according to the first embodiment and heat dissipation by the first heat dissipation unit 61a, the second heat dissipation unit 62a, and the third heat dissipation unit 63a will be described. The heat transfer unit 5 absorbs heat from the stator core 11a or the coil 12 and transfers the heat to the first heat dissipation unit 61a, the second heat dissipation unit 62a, or the third heat dissipation unit 63a. The first heat dissipation unit 61a, the second heat dissipation unit 62a, and the third heat dissipation unit 63a all absorb heat from the stator core 11a or the heat transfer unit 5 and transfer the heat directly to a refrigerant, air, or the like present inside the motor. The refrigerant here is, for example, cooling oil for cooling each component of the motor according to the first embodiment. After absorbing heat from at least one of the first heat dissipation unit 61a, the second heat dissipation unit 62a, and the third heat dissipation unit 63a, for example, the refrigerant flows downward. The refrigerant is then collected, for example, in an oil pan or the like disposed below the stator core 11a, cooled by a cooling device, and supplied again to the motor by a pump, thereby cooling the stator core 11a, the coils 12, etc.

[0032] The motor according to the first embodiment has been described above. The motor according to the first embodiment includes a heat dissipation member 4a disposed in the slot 110a. The heat dissipation member 4a is disposed within the slot 110a between the stator core 11a and the coil 12, and includes a heat transfer portion 5 extending in the direction of the rotation axis A, and a heat dissipation portion 6a formed integrally with the heat transfer portion 5. The heat dissipation portion 6a includes a first heat dissipation portion 61a, a second heat dissipation portion 62a, and a third heat dissipation portion 63a. The first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a all protrude from the end face 115a of the stator core 11a to the outside of the stator core 11a.

[0033] As a result, in the motor according to the first embodiment, heat generated in the stator core 11a, the coils 12, etc. can be removed by the heat transfer portion 5, and the heat can be transferred directly from the first heat dissipation portion 61a, the second heat dissipation portion 62a, or the third heat dissipation portion 63a to the refrigerant, the air, etc. Therefore, in the motor according to the first embodiment, the stator core 11a, the coils 12, etc. can be sufficiently cooled.

[0034] The first heat dissipation portion 61a extends in the radial direction of the stator core 11a outside the slots 110a and covers the end face 115a of the stator core 11a perpendicular to the rotation axis A. The second heat dissipation portion 62a extends in one circumferential direction of the stator core 11a outside the slots 110a and covers the end face 115a of the stator core 11a perpendicular to the rotation axis A. The third heat dissipation portion 63a extends in the other circumferential direction of the stator core 11a outside the slots 110a and covers the end face 115a of the stator core 11a perpendicular to the rotation axis A. This reduces the dimension of the motor in the direction of the rotation axis A, enabling miniaturization.

[0035] Furthermore, in the motor according to the first embodiment, the heat transfer portion 5, the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a are made of a material having a higher thermal conductivity than the material constituting the stator core 11a. As a result, the motor according to the first embodiment can more efficiently remove heat from the stator core 11a or the coils 12 using the heat transfer portion 5, and more efficiently transfer the heat to a refrigerant, air, or the like using the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a.

[0036] Furthermore, in the motor according to the first embodiment, the entire surfaces of the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a that face the end face 115a of the stator core 11a are in close contact with the end face 115a of the stator core 11a. This allows the motor according to the first embodiment to more effectively remove heat from the stator core 11a using the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a and transfer the heat to a refrigerant, air, or the like.

[0037] In the first embodiment, the heat dissipation member 4a includes the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a. However, the present invention is not limited to this. The heat dissipation member 4a may include at least one of the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a. The shapes, dimensions, orientations, etc. of the first heat dissipation member, the second heat dissipation member, and the third heat dissipation member according to the first embodiment are not particularly limited. Furthermore, the motor according to the first embodiment can achieve the same effects as those described above even when the motor includes at least one of the first heat dissipation member, the second heat dissipation member, and the third heat dissipation member having any shape, dimensions, orientation, etc.

[0038] In the first embodiment, the heat transfer portion 5, the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a are made of a material with a higher thermal conductivity than the material constituting the stator core 11a. However, this is not limiting. At least one of the heat transfer portion 5, the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a may be made of a material with a thermal conductivity equal to or lower than the thermal conductivity of the material constituting the stator core 11a.

[0039] Furthermore, in the first embodiment, the entire surfaces of the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a facing the end face of the stator core 11a are in close contact with the end face of the stator core 11a. However, this is not limiting. In the first embodiment, it is sufficient that at least a portion of the surfaces of the first heat dissipation member, the second heat dissipation member, and the third heat dissipation member facing the end face of the stator core are in close contact with the end face of the stator core. Alternatively, in the first embodiment, the entire surfaces of the first heat dissipation portion 61a, the second heat dissipation portion 62a, and the third heat dissipation portion 63a facing the end face of the stator core 11a may be separated from the end face of the stator core 11a. Even with these configurations, the motor according to the first embodiment achieves the same effects as those described above.

[0040] Second Embodiment The motor according to the second embodiment includes a second heat dissipation portion and a third heat dissipation portion having structures different from those of the above-described embodiment. Therefore, the description of the second embodiment will focus on the differences from the above-described embodiment, and components similar to those in the above-described embodiment will be assigned the same reference numerals as those used in the above-described embodiment, and descriptions of content that overlaps with the above-described embodiment will be omitted as appropriate.

[0041] 5 is a diagram showing an example of a stator core, a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion according to the second embodiment. As shown in FIG. 5, the motor according to the second embodiment includes a stator core 11b, a first heat dissipation member 41b, and a second heat dissipation member 42b. The motor according to the second embodiment also includes a heat transfer portion 5.

[0042] Stator core 11b has teeth formed thereon that are smaller in circumferential dimension than the teeth formed on stator core 11a according to the first embodiment. On the other hand, stator core 11b has slots formed thereon that have the same shape and dimensions as the individual slots formed on stator core 11a according to the first embodiment.

[0043] The heat transfer portion 5 is the same as the heat transfer portion 5 described in the first embodiment. In the second embodiment, the heat transfer portion 5 is disposed in at least the first slot 111b and the second slot 112b. The second slot 112b is an example of a slot adjacent to the first slot 111b on one side in the circumferential direction. Specifically, the second slot 112b is an example of a slot located on the counterclockwise side of the first slot 111b in the circumferential direction. The first slot 111b is an example of a slot adjacent to the second slot 112b on the other side in the circumferential direction. Specifically, the first slot 111b is an example of a slot located on the clockwise side of the second slot 112b in the circumferential direction. Note that the heat transfer portion 5 is preferably disposed in all slots formed in the stator core 11b.

[0044] The first heat dissipation member 41b is an example of a heat dissipation member included in the motor according to the second embodiment, and is disposed in the first slot 111b. The first heat dissipation member 41b is formed integrally with the heat transfer portion 5 disposed in the first slot 111b.

[0045] 5, the first heat dissipation member 41b includes a heat dissipation portion 61b. As shown in FIG. 5, the heat dissipation portion 61b includes a first heat dissipation portion 611b, a second heat dissipation portion 621b, and a third heat dissipation portion 631b. The first heat dissipation portion 611b extends from the heat transfer portion 5 in the radial direction to cover the end face 115b of the stator core 11b. The second heat dissipation portion 621b extends from the heat transfer portion 5 in the clockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The third heat dissipation portion 631b extends from the heat transfer portion 5 in the counterclockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The first heat dissipation member 41b does not necessarily have to include at least one of the first heat dissipation portion 611b and the second heat dissipation portion 621b.

[0046] The second heat dissipation member 42b is an example of a heat dissipation member included in the motor according to the second embodiment, and is disposed in the second slot 112b. The second heat dissipation member 42b is formed integrally with the heat transfer portion 5 disposed in the second slot 112b.

[0047] 5, the second heat dissipation member 42b includes a heat dissipation portion 62b. As shown in FIG. 5, the heat dissipation portion 62b includes a first heat dissipation portion 612b, a second heat dissipation portion 622b, and a third heat dissipation portion 632b. The first heat dissipation portion 612b extends from the heat transfer portion 5 in the radial direction to cover the end face 115b of the stator core 11b. The second heat dissipation portion 622b extends from the heat transfer portion 5 in the clockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The third heat dissipation portion 632b extends from the heat transfer portion 5 in the counterclockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. Note that the second heat dissipation member 42b does not necessarily have to include at least one of the first heat dissipation portion 612b and the third heat dissipation portion 632b.

[0048] FIG. 6 is a diagram illustrating an example of a stator core, a heat transfer portion, a second heat dissipation portion, and a third heat dissipation portion according to the second embodiment. FIG. 6 illustrates an example of a stator core 11b, a heat transfer portion 5, a second heat dissipation portion 622b, and a third heat dissipation portion 631b viewed from the direction of the arrows in FIG. 5. As illustrated in FIG. 6, the third heat dissipation portion 631b and the second heat dissipation portion 622b overlap in the circumferential direction and include portions that are spaced apart in the direction of the rotation axis A. Note that, as illustrated in FIG. 6, the surfaces of the third heat dissipation portion 631b and the second heat dissipation portion 622b that face the end surface 115b of the stator core 11b are not in contact with the end surface 115b of the stator core 11b.

[0049] The motor according to the second embodiment has been described above. The motor according to the second embodiment includes third heat dissipation portion 631b and second heat dissipation portion 622b. Third heat dissipation portion 631b and second heat dissipation portion 622b overlap in the circumferential direction and include portions that are spaced apart in the direction of rotation axis A. This makes it possible to prevent a decrease in the heat dissipation effect of third heat dissipation portion 631b and second heat dissipation portion 622b, which would occur if third heat dissipation portion 631b and second heat dissipation portion 622b were in contact with each other and acted as heat sources.

[0050] In the second embodiment, it has been described that the third heat dissipation section 631b and the second heat dissipation section 622b have the structure shown in Figures 5 and 6, but other third heat dissipation sections and second heat dissipation sections may have a structure similar to the structure shown in Figures 5 and 6.

[0051] (Third embodiment) The motor according to the third embodiment includes a second heat dissipation portion and a third heat dissipation portion having structures different from those of the above-described embodiments. Therefore, the description of the third embodiment will focus on the differences from the above-described embodiments, and components similar to those in the above-described embodiments will be assigned the same reference numerals as those used in the above-described embodiments, and descriptions of content that overlaps with those in the above-described embodiments will be omitted as appropriate.

[0052] 7 is a diagram showing an example of a stator core, a first heat dissipation portion, a second heat dissipation portion, and a third heat dissipation portion according to the third embodiment. As shown in FIG. 7, the motor according to the third embodiment includes a stator core 11b, a first heat dissipation member 41c, and a second heat dissipation member 42c. The motor according to the third embodiment also includes a heat transfer portion 5.

[0053] The stator core 11b is similar to the stator core 11b according to the second embodiment. The heat transfer portions 5 are similar to those described in the above-described embodiments. In the third embodiment, the heat transfer portions 5 are disposed in at least the first slots 111b and the second slots 112b. The second slots 112b are an example of slots adjacent to the first slots 111b on one side in the circumferential direction. Specifically, the second slots 112b are an example of slots located counterclockwise from the first slots 111b in the circumferential direction. The first slots 111b are an example of slots adjacent to the second slots 112b on the other side in the circumferential direction. Specifically, the first slots 111b are an example of slots located clockwise from the second slots 112b in the circumferential direction. It is preferable that the heat transfer portions 5 be disposed in all slots formed in the stator core 11b.

[0054] The first heat dissipation member 41c is an example of a heat dissipation member included in the motor according to the third embodiment, and is disposed in the first slot 111b. The first heat dissipation member 41c is formed integrally with the heat transfer portion 5 disposed in the first slot 111b.

[0055] 7, the first heat dissipation member 41c includes a heat dissipation portion 61c. As shown in FIG. 7, the heat dissipation portion 61c includes a first heat dissipation portion 611b, a second heat dissipation portion 621b, and a third heat dissipation portion 631c. The first heat dissipation portion 611b extends from the heat transfer portion 5 in the radial direction to cover the end face 115b of the stator core 11b. The second heat dissipation portion 621b extends from the heat transfer portion 5 in the clockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The third heat dissipation portion 631c extends from the heat transfer portion 5 in the counterclockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The first heat dissipation member 41c does not necessarily have to include at least one of the first heat dissipation portion 611b and the second heat dissipation portion 621b.

[0056] The second heat dissipation member 42c is an example of a heat dissipation member included in the motor according to the third embodiment, and is disposed in the second slot 112b. The second heat dissipation member 42c is formed integrally with the heat transfer portion 5 disposed in the second slot 112b.

[0057] 7, the second heat dissipation member 42c includes a heat dissipation portion 62c. As shown in FIG. 7, the heat dissipation portion 62c includes a first heat dissipation portion 612b, a second heat dissipation portion 622b, and a third heat dissipation portion 632c. The first heat dissipation portion 612b extends from the heat transfer portion 5 in the radial direction to cover the end face 115b of the stator core 11b. The second heat dissipation portion 622b extends from the heat transfer portion 5 in the clockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. The third heat dissipation portion 632c extends from the heat transfer portion 5 in the counterclockwise direction in the circumferential direction to cover the end face 115b of the stator core 11b. Note that the second heat dissipation member 42c does not necessarily have to include at least one of the first heat dissipation portion 612b and the third heat dissipation portion 632c.

[0058] 7, third heat dissipation portion 631c and second heat dissipation portion 622b include portions that do not overlap in the circumferential direction and are disposed at the same height in the direction of rotation axis A. This structure is achieved by cutting the portion of third heat dissipation portion 631c that covers end face 115b of stator core 11b so that it does not come into contact with the portion of second heat dissipation portion 622b that covers end face 115b. Note that the surfaces of third heat dissipation portion 631c and second heat dissipation portion 622b that face end face 115b of stator core 11b do not come into contact with end face 115b of stator core 11b.

[0059] The motor according to the third embodiment has been described above. The motor according to the third embodiment includes a third heat dissipation portion 631c and a second heat dissipation portion 622b. Third heat dissipation portion 631c and second heat dissipation portion 622b do not overlap in the circumferential direction and include portions that are disposed at the same height in the direction of rotation axis A. This makes it possible to prevent a decrease in the heat dissipation effect of third heat dissipation portion 631c and second heat dissipation portion 622b, which would occur if third heat dissipation portion 631c and second heat dissipation portion 622b were in contact with each other and acted as heat sources.

[0060] In the third embodiment, it has been described that the third heat dissipation section 631c and the second heat dissipation section 622b have the structure shown in Figure 7, but other third heat dissipation sections and second heat dissipation sections may have a structure similar to the structure shown in Figure 7.

[0061] In the third embodiment, the third heat dissipation portion 631c is cut and therefore not in contact with the second heat dissipation portion 622b. However, the present invention is not limited to this. In In the motor according to the third embodiment, the second heat dissipation portion may be cut so that it is not in contact with the third heat dissipation portion, or in the motor according to the third embodiment, both the second heat dissipation portion and the third heat dissipation portion may be cut so that they are not in contact with each other.

[0062] (Fourth embodiment) The motor according to the fourth embodiment includes a first heat dissipation portion having a different structure from the above-described embodiments. Therefore, the description of the fourth embodiment will focus on the differences from the above-described embodiments, and the same components as those in the above-described embodiments will be assigned the same reference numerals as those used in the above-described embodiments, and descriptions of the same components as those in the above-described embodiments will be omitted as appropriate.

[0063] Fig. 8 is a diagram showing an example of a first heat dissipation portion according to the fourth embodiment. As shown in Fig. 8, the motor according to the fourth embodiment includes a stator core 11a and a heat dissipation member 4d. The motor according to the fourth embodiment also includes a heat transfer portion 5.

[0064] The stator core 11a is the same as the stator core 11a according to the first embodiment. The heat transfer portion 5 is the same as that described in the above embodiment, and is arranged along the slots 110a formed in the stator core 11a.

[0065] The heat dissipation member 4d includes a heat transfer portion 5 and a heat dissipation portion 6d shown in Fig. 8. As shown in Fig. 8, the heat dissipation portion 6d includes a first heat dissipation portion 61d, a second heat dissipation portion 62a, and a third heat dissipation portion 63a. As shown in Fig. 8, the first heat dissipation portion 61d extends in the radial direction to an end of the end face 115a of the stator core 11a.

[0066] The motor according to the fourth embodiment has been described above. The motor according to the fourth embodiment includes the first heat dissipation portion 61d that extends to the end of the end face 115a of the stator core 11a in the radial direction. As a result, the motor according to the fourth embodiment can more efficiently transfer heat to a refrigerant, air, etc. by using the first heat dissipation portion 61d, which has a larger area than the first heat dissipation portion 61a according to the first embodiment.

[0067] In the fourth embodiment, the first heat dissipation portion 61d extends to the end of the end face 115a of the stator core 11a in the radial direction, but is not limited thereto. For example, the first heat dissipation portion according to the fourth embodiment may extend to the side surface of the stator core 11a via the end of the end face 115a of the stator core 11a.

[0068] In the above-described embodiment, a motor is used as an example of a rotating electric machine, but the rotating electric machine according to the embodiment may be a generator that converts mechanical energy into electrical energy, instead of a motor that converts electrical energy into mechanical energy.

[0069] In the above-described embodiment, the first, second, and third heat dissipation sections are described as plates, but this is not limiting. That is, at least one of the first, second, and third heat dissipation sections does not necessarily have to be plate-shaped and may have any shape. For example, at least one of the first, second, and third heat dissipation sections may have an uneven surface to increase the surface area and more efficiently transfer heat to the refrigerant, air, etc. Alternatively, at least one of the first, second, and third heat dissipation sections may have heat dissipation fins or the like attached to the surface to increase the surface area and more efficiently transfer heat to the refrigerant, air, etc.

[0070] The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. In other words, the present invention includes embodiments in which various modifications, substitutions, design changes, etc. have been made based on the spirit of the present invention, and does not exclude these embodiments. [Explanation of symbols]

[0071] 4a, 4d...heat dissipation members 41b, 41c...first heat dissipation member 42b, 42c...second heat dissipation member 5...Heat transfer section 6a,61b,62b,61c,62c,6d...heat radiation part 61a, 611b, 612b, 61d… First exothermic section 62a, 621b, 622b… Second heat-generating section 63a, 631b, 632b, 631c, 632c… Third heat-generating section

Claims

1. a stator core having, as slots for accommodating coils, a first slot and a second slot adjacent to the first slot on one side in the circumferential direction within a plane having a center on a point on the rotation axis and perpendicular to the rotation axis; a first heat dissipation member disposed in the first slot; a second heat dissipation member disposed in the second slot, the first heat dissipation member is disposed within the slot between the stator core and the coil, and includes a heat transfer portion extending in the direction of the rotation axis, and is formed integrally with the heat transfer portion, and includes a first heat dissipation portion extending in a radial direction of the stator core outside the slot and covering an end face of the stator core perpendicular to the rotation axis, a second heat dissipation portion extending on one side of the circumferential direction of the stator core outside the slot and covering the end face of the stator core perpendicular to the rotation axis, and a third heat dissipation portion extending on the other side of the circumferential direction of the stator core outside the slot and covering the end face of the stator core perpendicular to the rotation axis, the second heat dissipation member includes the heat transfer portion, includes at least one of the first heat dissipation portion and the third heat dissipation portion, and includes the second heat dissipation portion, the third heat dissipation portion of the first heat dissipation member and the second heat dissipation portion of the second heat dissipation member overlap in the circumferential direction and include portions that are spaced apart in the direction of the rotation axis, Rotating electric motor.

2. The first heat dissipation portion extends in a radial direction to an end of an end surface of the stator core perpendicular to the rotation axis. The rotating electric machine according to claim 1 .

3. At least one of the heat transfer portion, the first heat dissipation portion, the second heat dissipation portion, and the third heat dissipation portion is made of a material having a higher thermal conductivity than a material constituting the stator core. The rotating electric machine according to claim 1 or 2.

4. At least a part of a surface of each of the first heat dissipation portion, the second heat dissipation portion, and the third heat dissipation portion facing an end face of the stator core perpendicular to the rotation axis is in close contact with the end face of the stator core perpendicular to the rotation axis. The rotating electric machine according to claim 1 or 2.

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