Motor

Abstract

The invention provides a motor capable of connecting a coil terminal part and a bus bar terminal regardless of the position of an external connection terminal. The motor includes a plurality of layers of bus bar terminals overlapping in the axial direction, an external connection terminal and a coil connection terminal are formed on the bus bar terminals, and a coil terminal portion led out from a winding portion overlapping with the external connection terminal in the axial direction is connected with the coil connection terminal in a state of being led out in the circumferential direction.

Description

Technical Field

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

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

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2021-52492 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in the structure disclosed in Patent Document 1, the coil cannot be connected to the bus terminal at a portion overlapping with the external connection terminal in the axial direction of the motor.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a motor in which a coil terminal portion can be connected to a bus terminal regardless of the position of an external connection terminal.

[0009] [Technical means to solve the problem]

[0010] In order to solve the above-mentioned problem, one aspect of the present invention provides a motor.

[0011] It includes multiple layers of busbar terminals overlapped in the axial direction.

[0012] The busbar terminal is formed with an external connection terminal and a coil connection terminal.

[0013] The coil terminal end portion led out from the winding portion overlapping the external connection terminal in the axial direction is connected to the coil connection terminal in a state formed so as to be led out in the circumferential direction.

[0014] [Effects of the Invention]

[0015] According to the present invention, the coil terminal portion can be connected to the bus bar terminal regardless of the position of the external connection terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view showing the structure of a stator unit in the motor of this embodiment.

[0017] Figure 2 It is a perspective view showing the structure of a bus bar terminal provided in a bus bar unit.

[0018] Figure 3 It is a perspective view illustrating a connection state between a coil and a bus terminal.

[0019] [Explanation of Symbols]

[0020] 12: Coil

[0021] 12A: Coil terminal

[0022] 12B: Winding part

[0023] 15: Location

[0024] 31U, 31V, 31W: Busbar terminals

[0025] 31Ua, 31Ub, 31Va, 31Vb, 31Wa, 31Wb: Coil connection terminals

[0026] 31Ut, 31Vt, 31Wt: External connection terminals

[0027] 32U, 32V, 32W: Busbar terminals

[0028] 32Ua, 32Ub, 32Va, 32Vb, 32Wa, 32Wb: Coil connection terminals

[0029] 32Ut, 32Vt, 32Wt: External connection terminals DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0031] Figure 1 is a perspective view showing the structure of a stator unit in the motor of this embodiment, Figure 2 It is a perspective view showing the structure of a bus bar terminal provided in a bus bar unit.

[0032] like Figure 1 As shown, the three-phase brushless motor as the motor of this embodiment includes: a stator unit 10 of a roughly cylindrical shape surrounding a rotor unit (not shown), and a busbar unit 30 installed at the axial end of the stator unit 10. In addition, the axial direction corresponds to the direction of the rotating shaft of the motor, and the circumferential direction corresponds to the direction around the rotating shaft of the motor. In addition, the structure of the motor body (stator unit) disclosed in the present invention is arbitrary and is not limited to the structure of the motor shown in this embodiment (the number of phases, the number of poles, the connection state of the coil, etc.). In addition, the use of the motor is also arbitrary, but as an example, the motor of this embodiment can be applied to a motor for power steering.

[0033] like Figure 1 As shown, the stator unit 10 includes: a plurality of (in Figure 1The invention comprises a stator core 11 (12 poles in the embodiment), a plurality of coils 12 wound on the stator core 11, and insulators 13A and 13B inserted between the stator core 11 and the coils 12, respectively.

[0034] like Figure 1 and Figure 2 As shown, the busbar unit 30 includes: busbar terminals 31U, 31V and 31W corresponding to the U phase, V phase and W phase, and busbar terminals 32U, 32V and 32W corresponding to the U phase, V phase and W phase, respectively. Figure 1 Illustration of an insulating member that is provided in the bus bar unit 30 and covers the bus bar terminals 31U, 31V, 31W, 32U, 32V, and 32W is omitted.

[0035] like Figure 2 As shown, the bus bar terminal 31U, the bus bar terminal 31V, and the bus bar terminal 31W constitute a plurality of layers stacked in the axial direction.

[0036] The bus terminal 31U is provided with an external connection terminal 31Ut to which a U-phase driving voltage is applied, and a coil terminal portion 12A (see FIG. 1 ) to which the external connection terminal 31Ut is connected. Figure 3 ) are formed with two coil connection terminals 31Ua and 31Ub. The bus terminal 31V is provided with an external connection terminal 31Vt to which a V-phase driving voltage is applied, and two coil connection terminals 31Va and 31Vb to which the coil terminal portions 12A are respectively connected. The bus terminal 31W is provided with an external connection terminal 31Wt to ​​which a W-phase driving voltage is applied, and two coil connection terminals 31Wa and 31Wb to which the coil terminal portions 12A are respectively connected.

[0037] like Figure 2 As shown, the bus bar terminals 32U, 32V, and 32W constitute a plurality of layers stacked in the axial direction.

[0038] In addition, the bus terminal 32U is provided with an external connection terminal 32Ut to which a U-phase driving voltage is applied, and two coil connection terminals 32Ua and 32Ub to which the coil terminal 12A is respectively connected. The bus terminal 32V is provided with an external connection terminal 32Vt to which a V-phase driving voltage is applied, and two coil connection terminals 32Va and 32Vb to which the coil terminal 12A is respectively connected. The bus terminal 32W is provided with an external connection terminal 32Wt to ​​which a W-phase driving voltage is applied, and two coil connection terminals 32Wa and 32Wb to which the coil terminal 12A is respectively connected.

[0039] Figure 3 This is a diagram illustrating a connection state between a coil and a bus terminal.

[0040] Figure 3 The coil 12 shown in the figure has two winding parts 12B corresponding to the two stator cores 11, and two coil terminal parts 12A respectively drawn from the two winding parts 12B and connected to the bus terminal 31U and the bus terminal 31W respectively. Figure 3 As shown, in this embodiment, two stator cores 11 ( Figure 1 ) two jumper windings. However, in the present invention, the configuration method of the winding portion is arbitrary and is not limited to two jumper windings.

[0041] exist Figure 3 In the embodiment, the coil terminal portion 12A extending from the winding portion 12B located on the right has a portion 15 extending in the circumferential direction by forming. Furthermore, the coil terminal portion 12A is bent axially from the portion 15 by forming, and is connected to the coil connection terminal 31Ua by welding in a state where the insulation coating of the front end portion is removed.

[0042] like Figure 3 As shown, in Figure 3 The winding portion 12B located on the right side in the middle is located at a position overlapping with the external connection terminals 31Ut, 31Vt, and 31Wt in the axial direction, but the coil terminal portion 12A extends in the circumferential direction at the portion 15. Therefore, it is possible to avoid the approach or interference between the coil connection terminal 31Ua and the external connection terminals 31Ut, 31Vt, and 31Wt. As a result, for example, a welding torch can be inserted into the coil connection terminal 31Ua, and the motor can be manufactured.

[0043] On the other hand, if the coil terminal 12A extending linearly in the axial direction is connected to the bus terminal 31U without providing the portion 15, the connection portion between the coil terminal 12A and the bus terminal approaches or interferes with the external connection terminal 31Ut, the external connection terminal 31Vt, and the external connection terminal 31Wt. Therefore, the coil terminal 12A cannot be connected to the bus terminal.

[0044] In this embodiment, the coil terminal portion 12A having a portion extending in the circumferential direction (a portion corresponding to the portion 15) can be connected to any one of the busbar terminal 31U, the busbar terminal 31V, and the busbar terminal 31W. Figure 3As shown in the example, when the coil terminal 12A is connected to the bus terminal 31U farthest from the stator unit 10 in the axial direction, a sufficient interval between the winding portion 12B and the bus terminal 31U (coil connection terminal 31Ua) in the axial direction can be ensured. Therefore, the coil terminal 12A can be easily formed, and the workability during motor manufacturing can be improved.

[0045] 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 to be separated from the winding portion 12B in the circumferential direction by a spacing greater than the spacing between adjacent stator cores 11. Figure 3 In the example, the coil connection terminal 31Ua can be provided at a position separated from the right winding portion 12B at an angle of 30° or more around the axis. In this way, by providing the coil connection terminal 31Ua at a position separated from the winding portion 12B in the circumferential direction, even if the winding portion 12B is arranged at a position overlapping with the external connection terminals 31Ut, 31Vt, and 31Wt, a sufficient distance can be ensured between the external connection terminals 31Ut, 31Vt, and 31Wt and the coil connection terminal 31Ua.

[0046] As described above, according to the present embodiment, the coil terminal portion can be connected to the bus bar terminal regardless of the position of the external connection terminal.

[0047] As mentioned above, although the embodiment of the present invention is described in detail with reference to the drawings, the specific structure is not limited to the embodiment, and also includes designs and the like within the scope that does not depart from the gist of the present invention.

[0048] In addition, regarding the above-mentioned embodiment of the present invention, the following supplementary notes are further disclosed.

[0049] [Note 1]

[0050] A motor comprises a plurality of bus terminals (31U, 31V, 31W) overlapping in an axial direction.

[0051] The bus terminal is formed with external connection terminals (31Ut, 31Vt, 31Wt) and a coil connection terminal (31Ua), and a coil terminal portion (12A) led out from a winding portion (12B) overlapping with the external connection terminal along the axial direction is connected to the coil connection terminal in a state formed to be led out along the circumferential direction.

[0052] According to the structure described in Supplementary Note 1, since the coil terminal portion is formed to be led out in the circumferential direction, the distance between the external connection terminal and the coil connection terminal can be ensured. Therefore, the coil terminal portion can be easily connected to the coil connection terminal regardless of the position of the external connection terminal.

[0053] [Note 2]

[0054] According to the motor of Supplementary Note 1, the coil connection terminal to which the coil terminal portion is connected is formed on a bus terminal (31U) arranged farthest from the stator in the axial direction among the multiple layers of bus terminals.

[0055] According to the structure 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 ensured. Therefore, the coil terminal portion can be easily formed.

[0056] [Note 3]

[0057] The motor according to Supplementary Note 1, wherein the coil connection terminals are arranged apart from the winding portion in the circumferential direction at an interval greater than an arrangement interval of adjacent stator cores.

[0058] According to the structure described in Supplementary Note 3, by providing the coil connection terminal at a position separated from the winding portion in the circumferential direction, a sufficient distance can be ensured between the external connection terminal and the coil connection terminal.

Claims

1. A motor comprising a plurality of bus terminals overlapped in an axial direction, The busbar terminal is formed with an external connection terminal and a coil connection terminal. The coil terminal end portion led out from the winding portion overlapping the external connection terminal in the axial direction is connected to the coil connection terminal in a state formed so as to be led out in the circumferential direction. 2 . The motor according to claim 1 , wherein the coil connection terminal to which the coil terminal end portion is connected is formed on a bus bar terminal that is disposed farthest from the stator in the axial direction among the plurality of bus bar terminals. 3 . The motor according to claim 1 , wherein the coil connection terminals are arranged apart from the winding portion in the circumferential direction at an interval equal to or greater than an arrangement interval of adjacent stator cores.

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