Motor

Abstract

To provide a motor whose coil end portion can be connected to a bus bar terminal regardless of the position of an external connection terminal.SOLUTION: A motor includes a plurality of layers of busbar terminals overlapping in the axial direction. The busbar terminals are formed with external connection terminals and coil connection terminals. The coil end portions drawn from windings overlapping with the external connection terminals in the axial direction are connected to the coil connection terminals in a state where they are drawn out in the circumferential direction and formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Patent Document 1 discloses a motor in which a coil wound around a stator core is linearly extended in the axial direction of the motor and electrically connected to a bus bar terminal by welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-52492 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Patent Document 1, the coil cannot be connected to the bus bar terminal at a portion that overlaps with the external connection terminal in the axial direction of the motor.

[0005] The present invention has been made to solve the above problems, and has an object to provide a motor in which coil end portions can be connected to bus bar terminals regardless of the positions of the external connection terminals. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention is to The busbar terminals are provided in layers that overlap in the axial direction. The bus bar terminal is provided with an external connection terminal and a coil connection terminal, The present invention provides a motor in which a coil terminal portion drawn from a winding portion overlapping with the external connection terminal in the axial direction is connected to the coil connection terminal in a state in which the coil terminal portion is drawn out in a circumferential direction and formed. Effect of the Invention

[0007] According to this invention, the coil end portion can be connected to the bus bar terminal regardless of the position of the external connection terminal. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view showing the configuration of a stator unit in the motor of the present embodiment. [Diagram 2] FIG. 2 is a perspective view showing a configuration of a bus bar terminal provided in the bus bar unit. [Diagram 3] 11 is a perspective view illustrating a connection state between a coil and a bus bar terminal. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] FIG. 1 is a perspective view showing the configuration of a stator unit in a motor of this embodiment, and FIG. 2 is a perspective view showing the configuration of a bus bar terminal provided in a bus bar unit.

[0011] As shown in FIG. 1, the three-phase brushless motor as the motor of this embodiment includes a substantially cylindrical stator unit 10 surrounding a rotor unit (not shown), and a busbar unit 30 attached to an axial end of the stator unit 10. The axial direction corresponds to the direction of the motor's rotation shaft, and the circumferential direction corresponds to the direction around the motor's rotation shaft. The configuration of the motor body (stator unit) of the present disclosure is arbitrary, and is not limited to the configuration of the motor shown in this embodiment (number of phases, number of poles, connection state of coils, etc.). The use of the motor is also arbitrary, but the motor of this embodiment can be applied to a motor for power steering, as an example.

[0012] As shown in FIG. 1, the stator unit 10 comprises a plurality of stator cores 11 (12 poles in FIG. 1) arranged at equal angles in the circumferential direction, a plurality of coils 12 wound around the stator cores 11, and insulators 13A and 13B interposed between each of the stator cores 11 and the coils 12.

[0013] 1 and 2, the busbar unit 30 includes busbar terminals 31U, 31V, and 31W corresponding to the U phase, V phase, and W phase, respectively, and busbar terminals 32U, 32V, and 32W corresponding to the U phase, V phase, and W phase, respectively. For ease of explanation, insulating members provided on the busbar unit 30 and covering the busbar terminals 31U, 31V, 31W, 32U, 32V, and 32W are omitted from FIG. 1.

[0014] As shown in FIG. 2, the bus bar terminal 31U, the bus bar terminal 31V, and the bus bar terminal 31W form a plurality of layers overlapping in the axial direction.

[0015] The busbar terminal 31U is provided with an external connection terminal 31Ut to which a U-phase drive voltage is applied, and two coil connection terminals 31Ua and 31Ub to which the coil end portions 12A (see FIG. 3) are respectively connected. The busbar terminal 31V is provided with an external connection terminal 31Vt to which a V-phase drive voltage is applied, and two coil connection terminals 31Va and 31Vb to which the coil end portions 12A are respectively connected. The busbar terminal 31W is provided with an external connection terminal 31Wt to ​​which a W-phase drive voltage is applied, and two coil connection terminals 31Wa and 31Wb to which the coil end portions 12A are respectively connected.

[0016] As shown in FIG. 2, bus bar terminal 32U, bus bar terminal 32V, and bus bar terminal 32W form a plurality of layers overlapping in the axial direction.

[0017] The busbar terminal 32U is provided with an external connection terminal 32Ut to which a U-phase drive voltage is applied, and two coil connection terminals 32Ua and 32Ub to which the coil end portions 12A are respectively connected. The busbar terminal 32V is provided with an external connection terminal 32Vt to which a V-phase drive voltage is applied, and two coil connection terminals 32Va and 32Vb to which the coil end portions 12A are respectively connected. The busbar terminal 32W is provided with an external connection terminal 32Wt to ​​which a W-phase drive voltage is applied, and two coil connection terminals 32Wa and 32Wb to which the coil end portions 12A are respectively connected.

[0018] FIG. 3 is a diagram illustrating a connection state between the coil and the bus bar terminals.

[0019] The coil 12 shown in Fig. 3 has two winding portions 12B corresponding to the two stator cores 11, and two coil end portions 12A that are respectively drawn out from the two winding portions 12B and connected to bus bar terminals 31U and 31W. As shown in Fig. 3, this embodiment illustrates an alternate winding in which two stator cores 11 (Fig. 1) are arranged between two winding portions 12B. However, in the present invention, the arrangement of the winding portions is arbitrary and is not limited to the alternate winding.

[0020] 3, coil end portion 12A drawn out from winding portion 12B located on the right has portion 15 extended in the circumferential direction by forming. Furthermore, coil end portion 12A is bent in the axial direction from portion 15 by forming, and connected to coil connection terminal 31Ua by welding with the insulating coating of its tip portion removed.

[0021] As shown in Fig. 3, the winding portion 12B located on the right side in Fig. 3 is positioned so as to overlap with the external connection terminals 31Ut, 31Vt, and 31Wt in the axial direction, but the coil end portion 12A extends in the circumferential direction at the portion 15. This makes it possible to prevent the coil connection terminal 31Ua from approaching or interfering with the external connection terminals 31Ut, 31Vt, and 31Wt. This makes it possible to insert a welding torch toward the coil connection terminal 31Ua, for example, and thus makes it possible to manufacture a motor.

[0022] In contrast, if an attempt were made to connect coil end portion 12A, which extends linearly in the axial direction, to busbar terminal 31U without providing portion 15, the connection portion between coil end portion 12A and the busbar terminal would come close to or interfere with external connection terminals 31Ut, 31Vt, and 31Wt, making it impossible to connect coil end portion 12A to the busbar terminal.

[0023] In this embodiment, the coil end portion 12A having a circumferentially extending portion (a portion corresponding to portion 15) may be connected to any of the busbar terminal 31U, the busbar terminal 31V, and the busbar terminal 31W. However, as in the example shown in Fig. 3, when the coil end portion 12A is connected to the busbar terminal 31U that is the furthest from the stator unit 10 in the axial direction, a sufficient distance in the axial direction can be secured between the winding portion 12B and the busbar terminal 31U (coil connection terminal 31Ua). This makes it easier to form the coil end portion 12A, improving workability during motor manufacturing.

[0024] In addition, in this embodiment, the positional relationship between the winding portion 12B and the coil connection terminal 31Ua in the circumferential direction is also arbitrary. For example, the coil connection terminal 31Ua may be arranged at an interval in the circumferential direction with respect to the winding portion 12B that is equal to or greater than the arrangement interval of the adjacent stator cores 11. For example, in the example of FIG. 3, the coil connection terminal 31Ua can be arranged at a position that is 30° or more away from the right winding portion 12B in terms of an angle around the axis. In this way, by providing the coil connection terminal 31Ua at a position that is circumferentially away from the winding portion 12B, even if the winding portion 12B is arranged at a position that overlaps with the external connection terminals 31Ut, 31Vt, and 31Wt, a sufficient distance can be secured between the external connection terminals 31Ut, 31Vt, and 31Wt and the coil connection terminal 31Ua.

[0025] As described above, according to this embodiment, the coil end portions can be connected to the bus bar terminals regardless of the positions of the external connection terminals.

[0026] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included.

[0027] In addition, the following supplementary notes are disclosed regarding the above-mentioned embodiment of the present invention.

[0028] [Appendix 1] Equipped with multiple layers of busbar terminals (31U, 31V, 31W) that overlap in the axial direction, The bus bar terminals are formed with external connection terminals (31Ut, 31Vt, 31Wt) and coil connection terminals (31Ua), and a coil end portion (12A) pulled out from a winding portion (12B) that overlaps with the external connection terminals in the axial direction is connected to the coil connection terminals in a state formed so as to be pulled out in the circumferential direction.

[0029] According to the configuration described in Supplementary Note 1, since the coil end portions are formed so as to be drawn out in the circumferential direction, the distance between the external connection terminals and the coil connection terminals can be secured, and therefore the coil end portions can be easily connected to the coil connection terminals regardless of the positions of the external connection terminals.

[0030] [Appendix 2] The motor described in Appendix 1, wherein the coil connection terminal to which the coil end portion is connected is formed in a bus bar terminal (31U) among the multiple layers of bus bar terminals that is arranged farthest from the stator in the axial direction.

[0031] According to the configuration described in Supplementary Note 2, the distance between the winding portion of the coil and the coil connection terminal in the axial direction can be secured, which makes it possible to easily form the coil terminal portion.

[0032] [Appendix 3] 2. The motor described in claim 1, wherein the coil connection terminals are arranged circumferentially away from the winding portion at intervals equal to or greater than the interval between adjacent stator cores.

[0033] According to the configuration described in Supplementary Note 3, by providing the coil connection terminal at a position circumferentially spaced from the winding portion, a sufficient distance can be ensured between the external connection terminal and the coil connection terminal. [Explanation of symbols]

[0034] 12 Coils 12A coil terminal 12B Winding section 15 parts 31U, 31V, 31W Busbar Terminal 31Ua, 31Ub, 31Va, 31Vb, 31Wa, 31Wb Coil connection terminal 31Ut, 31Vt, 31Wt External connection terminals 32U, 32V, 32W Busbar Terminal 32Ua, 32Ub, 32Va, 32Vb, 32Wa, 32Wb Coil connection terminal 32Ut, 32Vt, 32Wt external connection terminals

Claims

1. The busbar terminals are provided in layers that overlap in the axial direction. The bus bar terminal is provided with an external connection terminal and a coil connection terminal, A motor in which a coil terminal portion drawn from a winding portion overlapping the external connection terminal in the axial direction is connected to the coil connection terminal in a state in which it is drawn out in a circumferential direction and formed.

2. 2. The motor according to claim 1, wherein the coil connection terminal to which the coil end portion is connected is formed on a bus bar terminal among the layers of bus bar terminals that is disposed farthest from the stator in the axial direction.

3. The motor according to claim 1 , wherein the coil connection terminals are arranged circumferentially spaced apart from the winding portions by an interval equal to or greater than an interval between adjacent stator cores.

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