Stator and rotating electric machine

Abstract

A stator (11) is provided with: a stator core (20) having teeth (23); a coil (40) wound around the teeth; a bus bar (71) electrically connected to the coil; a bus bar holder (60) that holds the bus bar; and a resin molded part (50) that covers the coil, the bus bar holder, and the bus bar together. The bus bar holder has a nip portion (61) disposed between the coil and the bus bar, and the thermal conductivity of the bus bar holder including the nip portion is lower than the thermal conductivity of the resin molded portion.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese Patent Application No. 2022-085338 filed on May 25, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0003] The invention relates to a stator and a rotating electric machine. Background Art

[0004] For example, the stator described in Patent Document 1 includes: a stator core having teeth; a coil wound around the teeth; and a bus bar electrically connected to the coil. In addition, the stator includes a mold resin that covers both the coil and the bus bar.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2010-268560

[0008] In the above-mentioned stator, when the temperature of the molded resin rises due to the heat generated by the busbar, the temperature difference between the coil and the molded resin may decrease. As a result, heat transfer from the coil to the molded resin may be slowed down, which may reduce the heat dissipation performance of the coil. Summary of the invention

[0009] An object of the present invention is to provide a stator and a rotating electrical machine capable of suppressing a decrease in heat dissipation performance of a coil.

[0010] In a first embodiment of the present invention, a stator comprises: a stator core having teeth; a coil wound around the teeth; a busbar electrically connected to the coil; a busbar holder holding the busbar; and a resin molded portion covering the coil, the busbar holder and the busbar together, the busbar holder having a clamping portion arranged between the coil and the busbar, and the thermal conductivity of the busbar holder including the clamping portion is lower than the thermal conductivity of the resin molded portion.

[0011] In a second embodiment of the present invention, a rotating electrical machine comprises a stator and a rotor opposite to the stator, wherein the stator comprises: a stator core having teeth; a coil wound around the teeth; a busbar electrically connected to the coil; a busbar holder that holds the busbar; and a resin molded portion that covers the coil, the busbar holder, and the busbar together, wherein the busbar holder has a clamping portion arranged between the coil and the busbar, and the thermal conductivity of the busbar holder including the clamping portion is lower than the thermal conductivity of the resin molded portion.

[0012] According to the above-mentioned stator and rotating electric machine, the heat of the busbar can be suppressed from being transferred to the coil peripheral part of the resin molded part by the clamping part of the busbar holder having a smaller thermal conductivity. Thus, the temperature rise at the coil peripheral part of the resin molded part can be suppressed. Therefore, by reducing the temperature difference between the coil and the resin molded part, the decrease in the heat transfer performance from the coil to the resin molded part can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description with reference to the attached drawings. These drawings are as follows:

[0014] Figure 1 It is a schematic diagram of a rotating electrical machine in the embodiment.

[0015] Figure 2 It is a three-dimensional view showing a stator of the same type partially in cross section.

[0016] Figure 3 It is a schematic cross-sectional view of a stator of the same type.

[0017] Figure 4 It is a schematic cross-sectional view of a stator according to a modified example.

[0018] Figure 5 It is a schematic cross-sectional view of a stator according to a modified example. DETAILED DESCRIPTION

[0019] Hereinafter, an embodiment of a stator and a rotating electrical machine will be described with reference to the accompanying drawings. In each of the drawings, for the convenience of description, a part of the structure may be exaggerated or simplified. In addition, the dimensional ratios of each part may be different in each drawing.

[0020] like Figure 1 As shown, the rotating electric machine 10 has a stator 11 and a rotor 12 facing the stator 11. The stator 11 is annular. The rotor 12 is arranged inside the stator 11. The rotor 12 has a rotating shaft 13. The rotor 12 and the stator 11 face each other in the radial direction, for example. The stator 11 is accommodated in a cylindrical housing 14. The stator 11 is accommodated in the housing 14, for example, by burn-in.

[0021] (Structure of stator 11)

[0022] like Figure 1 and Figure 2 As shown in FIG. 1 , the stator 11 includes a stator core 20, a bobbin 30, a coil 40, a resin molded portion 50, and a busbar holder 60. Figure 2 In FIG. 1 , a part of the resin mold portion 50 is shown in cross section.

[0023] The stator core 20 has a plurality of split cores 21 arranged annularly along the circumferential direction of the stator 11. The stator core 20 of the present embodiment has, for example, 12 split cores 21. Each split core 21 is made of, for example, a magnetic metal material. In the following description, the circumferential direction of the stator 11, the radial direction of the stator 11, and the axial direction of the stator 11 are referred to as "circumferential direction", "radial direction", and "axial direction", respectively.

[0024] Each split core 21 has a core back 22 and teeth 23 extending radially from the core back 22. The split cores 21 are arranged in the circumferential direction so that each core back 22 has an annular shape as a whole. Each tooth 23 extends radially.

[0025] In each core segment 21, the tooth 23 protrudes radially inward from the inner side surface of the core back 22, for example. The tip end of the tooth 23 faces the axis L1 of the stator 11. The base end of the tooth 23 is the radially outer end of the tooth 23.

[0026] like Figure 3 As shown, each split core 21 is formed of a plurality of core pieces 24 stacked in the axial direction. Each core piece 24 is made of, for example, an electromagnetic steel plate. Each core piece 24 is fixed to each other by, for example, bonding, riveting, laser welding, or the like.

[0027] like Figure 1 and Figure 2 As shown, in a state where the split cores 21 are arranged in an annular shape in the circumferential direction, the core backs 22 of the split cores 21 are arranged in an annular shape in the circumferential direction. Each core back 22 is in contact with the adjacent core backs 22 on both sides in the circumferential direction. The radial outer side surface of each core back 22 is in contact with the inner circumferential surface of the housing 14. The axial end surfaces of each core back 22 are located, for example, on the same plane perpendicular to the axis L1.

[0028] (Structure of bobbin 30)

[0029] A bobbin 30 is provided on each split core 21. For example, a plurality of bobbins 30 are provided corresponding to each of the plurality of split cores 21. The bobbin 30 has a tooth covering portion 31 covering the teeth 23. The coil 40 is wound around each tooth covering portion 31, for example. That is, the tooth covering portion 31 of the bobbin 30 is sandwiched between the split core 21 and the coil 40. Thus, the bobbin 30 electrically insulates the split core 21 from the coil 40. In addition, each split core 21, the bobbin 30, and the coil 40 constitute an integral component.

[0030] The bobbin 30 is made of an insulator such as a synthetic resin. As a material of the bobbin 30, for example, an epoxy resin or the like can be used. The bobbin 30 is molded, for example, with respect to the split core 21. That is, it is formed integrally with respect to the split core 21. Thus, the bobbin 30 can be in a state of being in close contact with the split core 21.

[0031] In addition, as a structure different from the structure of the present embodiment, for example, when a bobbin manufactured separately from the split core 21 is attached to the split core 21, there is a concern that a large gap will be generated between the split core 21 and the bobbin. In this regard, as shown in the present embodiment, by molding the bobbin 30 with respect to the split core 21, the gap between the split core 21 and the bobbin 30 can be eliminated or made extremely small.

[0032] like Figure 2 and Figure 3 As shown, in the tooth covering portion 31, a groove portion 32 extending in the radial direction is formed at a portion covering the axial end surface of the tooth 23. The groove portion 32 is formed, for example, at the circumferential center of the tooth covering portion 31. In addition, the groove portion 32 is formed, for example, from one end portion to the other end portion in the radial direction of the bobbin 30.

[0033] (Structure of Coil 40)

[0034] The coil 40 is formed into a three-phase connection of a U phase, a V phase, and a W phase. When power is supplied to the coil 40, the stator 11 generates a rotating magnetic field for driving the rotor 12 to rotate. The coil 40 is connected, for example, by a star connection having a neutral point. The busbar 71 buried inside the busbar holder 60 is electrically connected to the coil 40, for example, to function as a neutral point terminal. The busbar 71 is in a circular ring shape or an arc shape along the circumferential direction.

[0035] In addition, the stator 11 has a connection portion 72 that electrically connects the coils 40 to each other. The connection portion 72 is, for example, a transition wire that is a conductor that continues from the coil 40, or a busbar that is composed of a conductor that is separate from the conductor that constitutes the coil 40. In addition, in the drawings, a region where a plurality of connection portions 72 are arranged is illustrated as a connection portion 72. Figure 3 As shown, the coil 40 has a first coil end 41 as one end portion in the axial direction of the coil 40 and a second coil end 42 as the other end portion in the axial direction of the coil 40 .

[0036] (Structure of busbar holder 60)

[0037] like Figure 3 As shown, the busbar holder 60 holds the busbar 71. For example, the busbar 71 is embedded in the busbar holder 60 by insert molding. The busbar holder 60 is formed of, for example, a synthetic resin. As the material of the busbar holder 60, for example, epoxy resin or unsaturated polyester resin can be used.

[0038] The busbar holder 60 has a first covering portion 61, a second covering portion 62, and a third covering portion 63 that cover the busbar 71. The first covering portion 61 is clamped between the coil 40 and the busbar 71 in the axial direction. The first covering portion 61 covers the side of the busbar 71 that is opposite to the coil 40 in the axial direction. In the busbar holder 60, the first covering portion 61 is configured as a clamping portion arranged between the coil 40 and the busbar 71. The second covering portion 62 covers the side of the busbar 71 opposite to the first covering portion 61 in the axial direction. The third covering portion 63 covers both radial sides of the busbar 71. That is, in the cross section along the radial direction, the entire periphery of the busbar 71 is covered by the first covering portion 61, the second covering portion 62, and the third covering portion 63.

[0039] The busbar holder 60 and the busbar 71 are arranged on the axial side of the coil 40. For example, the busbar holder 60 and the busbar 71 are arranged near the first coil end 41 in the axial direction of the stator 11. The first covering portion 61 of the busbar holder 60 is arranged between the coil 40 and the busbar 71 in the axial direction. In addition, the first covering portion 61 is separated from the first coil end 41 in the axial direction.

[0040] The busbar holder 60 has a spacing portion 64 for maintaining the separation state between the first coil end 41 and the first covering portion 61. The spacing portion 64 extends from the first covering portion 61 and the third covering portion 63, for example. A plurality of spacing portions 64 are provided at equal intervals in the circumferential direction. The top end of each spacing portion 64 abuts against the bobbin 30 in the axial direction, for example. Thus, the spacing between the first covering portion 61 of the busbar holder 60 and the first coil end 41 is maintained.

[0041] The connection portion 72 is disposed on the opposite side of the first coil end 41 with respect to the busbar holder 60 in the axial direction. That is, the busbar holder 60 is located between the connection portion 72 and the first coil end 41 in the axial direction.

[0042] The stator 11 has a fixing band 73 that binds the connecting portion 72 and the busbar holder 60 relative to the first coil end 41. A plurality of fixing bands 73 are provided. The number of fixing bands 73 is, for example, the same as the number of coils 40. The fixing band 73 is provided in a manner that centrally surrounds the connecting portion 72, the busbar holder 60, and the first coil end 41 in a cross section along the radial direction. Thus, the busbar holder 60 and the connecting portion 72 are fixed relative to the coil 40 while the interval between the busbar holder 60 and the first coil end 41 is maintained by each spacing holding portion 64. In addition, for example, each fixing band 73 passes through the inner circumference of the coil 40 through the groove portion 32 of the corresponding bobbin 30.

[0043] (Structure of Resin Mold 50)

[0044] like Figure 2 and Figure 3As shown, the resin molded portion 50, for example, covers a plurality of coils 40, a busbar holder 60 including a busbar 71, and a connecting portion 72 all together. The resin molded portion 50 includes a first molded portion 51 covering the first coil end 41 and a second molded portion 52 covering the second coil end 42. The first molded portion 51 covers the first coil end 41, the busbar holder 60 including the busbar 71, the connecting portion 72, and each fixing band 73 all together. The first molded portion 51 covers both radial sides of the first coil end 41. In addition, the first molded portion 51 covers both radial sides of the busbar holder 60. In addition, the first molded portion 51 covers the axially outer side and both radial sides of the connecting portion 72. The second molded portion 52 covers the axially outer side and both radial sides of the second coil end 42.

[0045] like Figure 3 As shown, the first molded portion 51 has an intermediate portion 53 that enters between the first coil end 41 and the first covering portion 61 of the busbar holder 60. The intermediate portion 53 is in close contact with the first coil end 41 and the first covering portion 61, respectively.

[0046] The first molded portion 51 has a filling portion 54 that enters the groove portion 32. The filling portion 54 is sandwiched between the first coil end 41 and the teeth covering portion 31 of the bobbin 30. The filling portion 54 is in close contact with the surface of the groove portion 32 and the inner peripheral surface of the first coil end 41, respectively.

[0047] The outer peripheral surfaces of the first molded portion 51 and the second molded portion 52 are separated from the inner peripheral surface of the housing 14. Therefore, when the stator core 20 formed with the resin molded portion 50 is accommodated in the housing 14, the housing 14 can be prevented from interfering with the first molded portion 51 and the second molded portion 52.

[0048] like Figure 1 and Figure 2 As shown, the resin molded portion 50 has a third molded portion 55 that connects the first molded portion 51 and the second molded portion 52 by passing between the circumferentially adjacent teeth 23. The third molded portion 55 is filled between each of the plurality of teeth 23. The first molded portion 51 and the second molded portion 52 are connected to each other through the plurality of third molded portions 55.

[0049] In the stator 11, for example, an integral component including the split core 21, the bobbin 30, and the coil 40 is arranged in a ring shape. Then, the busbar holder 60 including the busbar 71 is arranged to face the first coil end 41. Then, each coil 40 is electrically connected to the busbar 71. Then, the busbar holder 60 and the connecting portion 72 are fixed to the first coil end 41 by the fixing band 73. Then, the resin molded portion 50 is molded so as to cover each coil 40, each bobbin 30, the busbar holder 60, and the connecting portion 72 together.

[0050] As the material of the resin mold part 50, for example, a material obtained by mixing epoxy resin or unsaturated polyester resin with alumina powder or the like can be used. The thermal conductivity of the resin mold part 50 is set to, for example, 2.0 (W / m·K) or more.

[0051] The thermal conductivity of the bus bar holder 60 including the first covering portion 61 is set to be lower than the thermal conductivity of the resin mold portion 50. In the present embodiment, the thermal conductivity of the bus bar holder 60 is set to be less than 2.0 (W / m·K).

[0052] In addition, the thermal conductivity of the bobbin 30 is set to be lower than the thermal conductivity of the resin molded portion 50. In the present embodiment, the thermal conductivity of the bobbin 30 is set to, for example, 1.0 (W / m·K) or less.

[0053] The operation of this embodiment will be described.

[0054] The rotor 12 rotates by interacting with the rotating magnetic field generated in the stator 11 by energizing each coil 40. At this time, the coil 40 generates heat by energizing. A portion of the heat of the coil 40 is released to the outside via the resin molded portion 50. As an example of a heat dissipation path, for example, a heat dissipation path from the coil 40 to the stator core 20 via the resin molded portion 50. Furthermore, the resin molded portion 50 is formed of a material having a higher thermal conductivity than the bobbin 30, thereby further improving the heat dissipation.

[0055] In addition, the busbar 71 generates heat by energizing each coil 40. The main part of the busbar 71 is buried inside the busbar holder 60. In addition, the thermal conductivity of the busbar holder 60 is set to be lower than that of the resin molded portion 50. The heat transfer from the busbar 71 to the resin molded portion 50 is inactivated by the busbar holder 60.

[0056] The effects of this embodiment will be described.

[0057] (1) The thermal conductivity of the busbar holder 60 is lower than that of the resin molded portion 50. According to this structure, the busbar holder 60 having a lower thermal conductivity can suppress the heat of the busbar 71 from being transferred to the coil peripheral portion of the resin molded portion 50. As a result, the temperature rise in the coil peripheral portion of the resin molded portion 50 can be suppressed. Therefore, by reducing the temperature difference between the coil 40 and the resin molded portion 50, the decrease in the heat transfer performance from the coil 40 to the resin molded portion 50 can be suppressed.

[0058] (2) The busbars 71 are embedded in the busbar holder 60 by insert molding. According to this configuration, the busbar holder 60 covering the busbars 71 can further appropriately inactivate heat transfer from the busbars 71 to the resin molded portion 50 .

[0059] (3) The busbar holder 60 and the busbars 71 are provided on the axial side of the coil 40. This configuration is advantageous in reducing the size of the stator 11 in the radial direction.

[0060] (4) The busbar holder 60 includes a first covering portion 61, a second covering portion 62, and a third covering portion 63. The first covering portion 61 covers the side of the busbar 71 that is opposite to the coil 40 in the axial direction. In the busbar holder 60, the first covering portion 61 is configured as a clamping portion arranged between the coil 40 and the busbar 71. The second covering portion 62 covers the side of the busbar 71 opposite to the first covering portion 61 in the axial direction. The third covering portion 63 covers both radial sides of the busbar 71. According to this structure, by including the busbar holder 60 including the first covering portion 61, the second covering portion 62, and the third covering portion 63, it is possible to further appropriately passivate the heat transfer from the busbar 71 to the resin molded portion 50.

[0061] (5) The first covering portion 61 of the busbar holder 60 and the coil 40 are arranged to be separated from each other. In addition, the resin molded portion 50 has an intermediate portion 53 that enters between the coil 40 and the first covering portion 61. According to this structure, the heat of the coil 40 can be dissipated to the intermediate portion 53 of the resin molded portion 50. The intermediate portion 53 is a part of the resin molded portion 50 and has a higher thermal conductivity than the busbar holder 60. Therefore, the heat of the coil 40 can be efficiently dissipated through the resin molded portion 50 including the intermediate portion 53.

[0062] (6) The busbar holder 60 includes the spacing portion 64 that maintains the coil 40 and the first covering portion 61 in a spaced state. With this configuration, the spacing portion 64 maintains the spacing between the coil 40 and the first covering portion 61, so that the intermediate portion 53 can be appropriately formed.

[0063] (7) The stator 11 has a connection portion 72 that electrically connects the plurality of coils 40. The resin molded portion 50 covers the coils 40, the busbar holder 60, and the connection portion 72. The busbar holder 60 including the first covering portion 61 is located between the connection portion 72 and the coils 40. According to this structure, the busbar holder 60 can suppress the heat of the connection portion 72 from being transferred to the coil peripheral portion of the resin molded portion 50.

[0064] (8) The stator 11 includes a fixing band 73 that binds the busbar holder 60 and the connecting portion 72 to the coil 40. According to this configuration, before the resin mold portion 50 is formed, the busbar holder 60 and the connecting portion 72 can be temporarily fixed to the coil 40 by the fixing band 73. Therefore, it is possible to suppress the positional displacement of the busbar holder 60 and the connecting portion 72 due to the filling pressure when the resin mold portion 50 is formed.

[0065] (Change Example)

[0066] The present embodiment can be implemented by being modified as follows. The present embodiment and the following modified examples can be implemented in combination with each other within the range that there is no technical contradiction.

[0067] like Figure 4 As shown, the resin molded portion 50 has a first portion 81 covering the coil 40 and a second portion 82 covering the busbar holder 60. The first portion 81 and the second portion 82 are formed of materials having different thermal conductivities. The first portion 81 covers the first coil end 41. The second portion 82 covers the busbar holder 60 and the connecting portion 72 together. The second portion 82 overlaps with the first portion 81 in the axial direction. The boundary between the first portion 81 and the second portion 82 is set between the first coil end 41 and the busbar holder 60. That is, the intermediate portion 53 clamped between the first coil end 41 and the busbar holder 60 is formed by a portion of the first portion 81 and a portion of the second portion 82. In addition, the first portion 81 includes a filling portion 54 that enters the groove portion 32.

[0068] exist Figure 4 In the structure shown, the thermal conductivity of the second portion 82 is greater than the thermal conductivity of the busbar holder 60 and smaller than the thermal conductivity of the first portion 81. According to this structure, the heat of the busbar 71 can be suppressed from being transferred to the first portion 81 covering the coil 40 by the busbar holder 60 and the second portion 82. As a result, the temperature rise in the first portion 81 of the resin molded portion 50 can be suppressed. Therefore, by reducing the temperature difference between the coil 40 and the first portion 81, the decrease in the heat transfer performance from the coil 40 to the first portion 81 can be suppressed. In addition, since the thermal conductivity of the second portion 82 is greater than the thermal conductivity of the busbar holder 60, the heat dissipation from the second portion 82 can be ensured. As a result, the deterioration of the heat dissipation performance of the resin molded portion 50 can be suppressed.

[0069] In addition, the second portion 82 of the resin molded portion 50 covers both the busbar holder 60 and the connecting portion 72. According to this structure, the heat of the connecting portion 72 can be prevented from being transferred to the first portion 81 covering the coil 40 by the second portion 82. Figure 4 In the example of FIG. 5 , a fixing belt 73 for binding the busbar holder 60 and the connecting portion 72 relative to the coil 40 may be provided.

[0070] like Figure 5 As shown, the busbar holder 60 including the busbar 71 may also be arranged radially with respect to the first coil end 41. According to such a structure, it is possible to contribute to the axial miniaturization of the stator 11. Figure 5In the example of , the busbar holder 60 is arranged radially outside the first coil end 41. The busbar holder 60 is configured to include a clamping portion 91 clamped between the first coil end 41 and the busbar 71 in the radial direction. The resin molded portion 50 covering the coil 40 and the busbar holder 60 has an intermediate portion 92 that enters between the first coil end 41 and the clamping portion 91. With such a structure, it is also possible to suppress the heat of the busbar 71 from being transferred to the coil peripheral portion of the resin molded portion 50 through the busbar holder 60 with a smaller thermal conductivity.

[0071] In addition, although Figure 5 In the example of FIG. 4 , the busbar holder 60 is arranged on the radially outer side of the first coil end 41 , but the present invention is not limited thereto. The busbar holder 60 may be arranged on the radially inner side of the first coil end 41 .

[0072] In addition, Figure 5 In the example of , a connection portion 72 for electrically connecting the coils 40 to each other may be provided in the resin molded portion 50. In this case, by arranging the connection portion 72 radially outward of the busbar holder 60, the busbar holder 60 is arranged between the connection portion 72 and the coil 40. Thus, the busbar holder 60 can suppress the heat of the connection portion 72 from being transferred to the coil peripheral portion of the resin molded portion 50.

[0073] In the above embodiment, the tip of the spacing portion 64 abuts against the bobbin 30 . Alternatively, for example, the tip of the spacing portion 64 abuts against the core back 22 of the stator core 20 .

[0074] In the above embodiment, the spacing holding portion 64 may be omitted from the busbar holder 60. In this case, for example, a column portion extending in the axial direction is formed on the bobbin 30. Furthermore, the top end of the column portion of the bobbin 30 may be configured to abut against the busbar holder 60. With such a structure, the separation state of the coil 40 and the busbar holder 60 can also be maintained by the column portion, and as a result, the intermediate portion 53 can be appropriately formed.

[0075] In the above embodiment, the busbar holder 60 and the connection portion 72 are bound to the coil 40 by the fixing band 73, but the present invention is not particularly limited thereto. For example, the busbar holder 60 and the connection portion 72 may be bound to the stator core 20 or the bobbin 30 by the fixing band 73.

[0076] The connection portion 72 may be provided inside the bus bar holder 60. Alternatively, the connection portion 72 may be provided outside the resin mold portion 50.

[0077] The busbar 71 is not limited to a structure buried inside the busbar holder 60. For example, the second cover portion 62 and the third cover portion 63 may be omitted from the busbar holder 60 of the above embodiment. In this case, the busbar holder 60 holds the busbar 71 only by the first cover portion 61. With such a structure, the first cover portion 61 can also suppress the heat of the busbar 71 from being transferred to the coil peripheral portion of the resin molded portion 50.

[0078] Although the bobbin 30 in the above embodiment is molded with respect to the stator core 20 , the present invention is not limited thereto, and for example, a structure in which a separately manufactured bobbin is attached to the stator core 20 may be adopted.

[0079] Alternatively, the outer peripheral surfaces of the first molded portion 51 and the second molded portion 52 may be in contact with the inner peripheral surface of the housing 14. This structure allows the heat of the first molded portion 51 and the second molded portion 52 to be appropriately transferred to the housing 14. As a result, the heat dissipation of the coil 40 can be further improved.

[0080] The numbers of the split cores 21 and the teeth 23 are not limited to those in the above-described embodiment, and may be appropriately changed according to the structure.

[0081] The stator core 20 is not limited to a structure formed of a plurality of split cores 21 , and may be formed of an integral member.

[0082] Alternatively, the rotor 12 and the stator 11 may be arranged opposite to each other in the axial direction.

[0083] The rotating electrical machine 10 of the above embodiment is an inner rotor type rotating electrical machine in which the rotor 12 is arranged on the inner circumference side of the stator 11 , but the present invention may also be applied to an outer rotor type rotating electrical machine in which the rotor is arranged on the outer circumference side of the stator.

[0084] The embodiments and modifications disclosed herein are illustrative in all aspects, and the present invention is not limited to these illustrative examples. That is, the scope of the present invention is as indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

[0085] (Note)

[0086] The features of the present invention are as follows.

[0087] [1] A stator comprises: a stator core (20) having teeth (23); a coil (40) wound around the teeth; a busbar (71) electrically connected to the coil; a busbar holder (60) holding the busbar; and a resin molded portion (50) covering the coil, the busbar holder and the busbar, the busbar holder having a clamping portion (61) arranged between the coil and the busbar, the thermal conductivity of the busbar holder including the clamping portion being lower than the thermal conductivity of the resin molded portion.

[0088] [2] According to the stator described in [1] above, the busbar is embedded in the busbar holder by insert molding.

[0089] [3] According to the stator described in [1] or [2], the busbar holder and the busbar are arranged on the side of the coil in the axial direction.

[0090] [4] According to the stator described in [3] above, the busbar retainer has: a first covering portion (61), which is the clamping portion covering the side of the busbar opposite to the coil in the axial direction; a second covering portion (62), which covers the side of the busbar opposite to the first covering portion in the axial direction; and a third covering portion (63), which covers both radial sides of the busbar.

[0091] [5] According to the stator described in any one of the above [1] to [4], the coil and the clamping portion are arranged separately from each other, and the resin molded portion has an intermediate portion (53) that enters between the coil and the clamping portion.

[0092] [6] According to the stator described in [5] above, the busbar holder has a spacing holding portion (64) that holds the coil and the clamping portion in a separated state.

[0093] [7] The stator according to any one of items [1] to [6] above also has a connecting portion (72) that electrically connects the plurality of coils to each other, the resin molded portion covers the coils, the busbar holder and the connecting portion, and the clamping portion of the busbar holder is located between the connecting portion and the coils.

[0094] [8] The stator according to any one of [1] to [7] above further comprises a fixing band (73) which binds the busbar holder relative to the coil or the stator core.

[0095] [9] According to the stator described in any one of the above [1] to [8], the resin molded portion has a first portion (81) covering the coil and a second portion (82) covering the busbar retainer, the first portion and the second portion are formed of materials with different thermal conductivities, and the thermal conductivity of the second portion is greater than the thermal conductivity of the busbar retainer and smaller than the thermal conductivity of the first portion.

[0096]

[10] The stator according to the above-mentioned [9] further comprises a connecting portion (72) which electrically connects the plurality of coils to each other, and the second portion of the resin molded portion covers both the busbar holder and the connecting portion.

[0097]

[11] A rotating electric machine (10) comprises a stator (11) and a rotor (12) opposite to the stator, wherein the stator comprises: a stator core (20) having teeth (23); a coil (40) wound around the teeth; a busbar (71) electrically connected to the coil; a busbar holder (60) holding the busbar; and a resin molded portion (50) covering the coil, the busbar holder and the busbar, the busbar holder having a clamping portion (61) arranged between the coil and the busbar, the thermal conductivity of the busbar holder including the clamping portion being lower than the thermal conductivity of the resin molded portion.

[0098] The present invention is described according to the embodiments, but it should be understood that the present invention is not limited to the embodiments and structures. The present invention also includes various modifications and variations within the equivalent range. In addition, although the present invention discloses various combinations and modes, other combinations and modes including only one element among these, or including the above elements or the following elements are all within the scope and thought of the present invention.

Claims

1. A stator, characterized in that: have: A stator core (20) having teeth (23); a coil (40) wound around the teeth; A busbar (71) electrically connected to the coil; a busbar holder (60) for holding the busbar; and a resin molded portion (50) which covers the coil, the busbar holder and the busbar together; The busbar holder has a clamping portion (61) arranged between the coil and the busbar. The busbar holder including the clamping portion has a thermal conductivity lower than a thermal conductivity of the resin mold portion.

2. The stator according to claim 1, characterized in that: The busbar is embedded in the busbar holder by insert molding.

3. The stator according to claim 1, characterized in that: The busbar holder and the busbar are provided on the side of the coil in the axial direction.

4. The stator according to claim 3, characterized in that: The busbar holder has: a first covering portion (61), the first covering portion being the clamping portion covering a side surface of the busbar that is opposite to the coil in the axial direction; a second covering portion (62) which covers the side of the busbar opposite to the first covering portion in the axial direction; as well as A third covering portion (63) covers both radial sides of the busbar.

5. The stator according to claim 1, characterized in that: The coil and the clamping portion are arranged separately from each other, The resin molded portion has an intermediate portion (53) that enters between the coil and the clamping portion.

6. The stator according to claim 5, characterized in that: The busbar holder has a spacing holding portion (64) for holding the coil and the clamping portion in a separated state.

7. The stator according to claim 1, characterized in that: It also includes a connecting portion (72) that electrically connects the plurality of coils. The resin molded portion covers the coil, the busbar holder, and the connecting portion together. The clamping portion of the busbar holder is located between the connecting portion and the coil.

8. The stator according to claim 1, characterized in that: A fixing band (73) is also provided, which binds the busbar holder relative to the coil or the stator core.

9. The stator according to claim 1, characterized in that: The resin molded portion has a first portion (81) covering the coil and a second portion (82) covering the busbar holder, The first portion and the second portion are formed of materials with different thermal conductivities. The thermal conductivity of the second portion is greater than the thermal conductivity of the busbar holder and smaller than the thermal conductivity of the first portion.

10. The stator according to claim 9, characterized in that It also includes a connecting portion (72) that electrically connects the plurality of coils. The second portion of the resin molded portion covers both the bus bar holder and the connecting portion.

11. A rotating electrical machine (10), comprising a stator (11) and a rotor (12) facing the stator, characterized in that: The stator has: A stator core (20) having teeth (23); a coil (40) wound around the teeth; A busbar (71) electrically connected to the coil; a busbar holder (60) for holding the busbar; and a resin molded portion (50) which covers the coil, the busbar holder and the busbar together; The busbar holder has a clamping portion (61) arranged between the coil and the busbar. The busbar holder including the clamping portion has a thermal conductivity lower than a thermal conductivity of the resin mold portion.

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