Rotating Electric Machine

Abstract

To provide a rotary electric machine capable of securing an insulation property between rotor coils and rotor salient poles by insulation members while restricting increase in physical constitution of the rotor coils.SOLUTION: Provided is a rotary electric machine that includes a rotor arranged so as to be opposed to a stator and rotating together with a rotation shaft. The rotor has: a rotor core with a plurality of rotor salient poles and slots formed between adjacent rotor salient poles; and rotor coils wound around the rotor salient poles via insulation members through the slots. Each rotor coil has: a slot coil part located in the slot; and a coil end part protruded from an axial end surface of the rotor core. Each insulation member has: a slot insulation part provided between the slot coil part and the rotor salient pole in the circumferential direction of the rotor core; and an end insulation part provided between the coil end part and the rotor salient pole in the axial direction of the rotor core. The slot insulation part and the end insulation part are integrated.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 describes a wound field type rotating electric machine that includes a rotor that is arranged opposite a stator and rotates together with a rotating shaft, the rotor having a plurality of rotor salient poles, a rotor core in which slots are formed between adjacent rotor salient poles, and a rotor coil that passes through the slots and is wound around the salient poles, and the field winding is attached to the salient poles of the rotor core via insulating winding frames that are attached in pairs to both axial ends of the rotor core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-162212 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is necessary to provide insulation between the rotor coil, which is the field winding, and the salient poles of the rotor core at both the coil end portions and inside the slots. However, there is room for improvement in order to ensure insulation while keeping the size of the rotor coil down.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a rotating electric machine that can reduce the size of the rotor coil while ensuring insulation between the rotor coil and the rotor salient poles using insulating members. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the present invention provides a rotating electric machine that includes a rotor that is arranged opposite a stator and rotates together with a rotating shaft, the rotor having a rotor core in which a plurality of salient rotor poles and slots are formed between adjacent salient rotor poles, and a rotor coil that passes through the slots and is wound around the salient rotor poles via an insulating member, the rotor coil having a slot coil portion located inside the slot and a coil end portion that protrudes beyond the axial end face of the rotor core, the insulating member having a slot insulation portion provided between the slot coil portion and the salient rotor pole in the circumferential direction of the rotor core, and an end insulation portion provided between the coil end portion and the salient rotor pole in the axial direction of the rotor core, and the slot insulation portion and the end insulation portion are integral.

[0007] As a result, in the rotating electric machine of the present invention, since the slot insulation portion and the end insulation portion of the insulating member are integrated, there is no overlap or seam between the slot insulation portion and the end insulation portion, so that the size of the rotor coil can be reduced while the insulation member ensures insulation between the rotor coil and the rotor salient poles.

[0008] In the above, the insulating member may have a first flange-shaped portion provided radially outward of the coil end portion and integral with the end insulating portion.

[0009] This allows the first brim-shaped portion to ensure insulation between the coil end portion and the rotor salient pole on the radial outside of the rotor, and also prevents the coil end portion from becoming misaligned due to centrifugal force when the rotor rotates.

[0010] In the above, the insulating member may have a second flange-shaped portion that is provided radially inside the coil end portion and is integral with the end insulating portion.

[0011] This makes it possible to ensure insulation between the coil end portions and the rotor salient poles on the radially inner side of the rotor by the second flange-shaped portions. Effect of the Invention

[0012] The rotating electric machine of the present invention has an insulating member in which the slot insulating portion and the end insulating portion are integrated, so that there are no overlaps or seams between the slot insulating portion and the end insulating portion, thereby achieving the effect of reducing the size of the rotor coil while ensuring insulation between the rotor coil and the rotor salient poles by the insulating member. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a rotating electric machine according to an embodiment, as viewed from an axial direction. [Diagram 2] FIG. 2 is a cross-sectional view of the rotor shown in FIG. 1 taken along line AA. [Diagram 3] FIG. 3 is a cross-sectional view of the rotor shown in FIG. 2 taken along line BB. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An embodiment of a rotating electric machine 1 according to the present invention will be described below. Note that the present invention is not limited to this embodiment.

[0015] Fig. 1 is a diagram showing a schematic configuration of a rotating electric machine 1 according to an embodiment as viewed from the axial direction. Fig. 2 is a cross-sectional view of a rotor 20 shown in Fig. 1 taken along line AA. Fig. 3 is a cross-sectional view of the rotor 20 shown in Fig. 2 taken along line BB.

[0016] The rotating electric machine 1 according to the embodiment is a three-phase synchronous rotating electric machine including a stator 10, a rotor 20, and the like.

[0017] The stator 10 is composed of a stator core 12, a plurality of teeth 14 arranged in the circumferential direction of the stator core 12, and a stator coil 16 wound multiple times around the teeth 14. Although only a portion of the stator 10 is shown in Fig. 1, the stator 10 is annular and is provided so as to surround the entire circumference of the rotor 20.

[0018] The stator core 12 is an annular magnetic member having a plurality of teeth 14 arranged on the inner periphery side thereof. The stator core 12 is formed by laminating a plurality of electromagnetic steel sheets having a predetermined shape.

[0019] The stator coil 16 includes a three-phase winding consisting of a U-phase winding, a V-phase winding, and a W-phase winding. Each phase winding is wound around a predetermined tooth 14 in sequence, passing through slots 18, which are spaces between adjacent teeth 14, in accordance with a predetermined distributed winding arrangement method. The windings of the stator coil 16 wound around the teeth 14 are arranged in the circumferential direction of the stator core 12 in the order of U-phase winding, V-phase winding, and W-phase winding, making one revolution.

[0020] The rotor 20 is composed of a rotor core 22, a plurality of salient rotor poles 24 arranged along the circumferential direction of the rotor core 22, a rotor coil 26 wound around the salient rotor poles 24, an insulating member 40, and the like.

[0021] The rotor core 22 is an annular magnetic member having a plurality of rotor salient poles 24 arranged on the outer periphery and a shaft hole in the center to which the rotating shaft 30 is fixed. The rotor core 22 is formed by laminating a plurality of electromagnetic steel sheets of a predetermined shape.

[0022] The rotor coil 26 is a field winding wound around the salient rotor poles 24 via an insulating member 40. The rotor coil 26 passes through the inside of a slot 28 formed between adjacent salient rotor poles 24 and is wound around the salient rotor poles 24 with a predetermined number of turns. The rotor coil 26 is wound around the salient rotor poles 24 in a state where it protrudes beyond the rotor core 22 on both sides in the axial direction. The rotor coil 26 has a slot coil portion 261 located inside the slot 28 and a coil end portion 262 protruding outward in the axial direction beyond the rotor core 22. In this embodiment, the "axial direction" refers to the direction in which the axis of the shaft 30 extends (the longitudinal direction of the shaft 30).

[0023] The insulating member 40 has a slot insulating portion 401 provided between the slot coil portion 261 and the salient rotor pole 24 (rotor core 22) in the circumferential direction of the rotor core 22, and an end insulating portion 402 provided between the coil end portion 262 and the salient rotor pole 24 (rotor core 22) in the axial direction of the rotor core 22. The slot insulating portion 401 and the end insulating portion 402 are integrally formed.

[0024] Here, for example, if the slot insulating portion 401 and the end insulating portion 402 are provided separately in the insulating member 40, a gap may be formed at the joint between the slot insulating portion 401 and the end insulating portion 402, which may reduce the insulation properties. Also, if the slot insulating portion 401 and the end insulating portion 402 are configured to overlap each other so that no gap is formed at the joint between the slot insulating portion 401 and the end insulating portion 402, the rotor coil 26 will be larger in size in the portion where the rotor coil 26 is wound around the salient rotor pole 24 through the overlapping portion between the slot insulating portion 401 and the end insulating portion 402 than in the portion where the rotor coil 26 is wound around the salient rotor pole 24 through only the slot insulating portion 401 or only the end insulating portion 402. On the other hand, if the number of turns of the rotor coil 26 around the rotor salient pole 24 is reduced so as to prevent the size of the rotor coil 26 from increasing at the portion where the rotor coil 26 is wound around the rotor salient pole 24 through the overlapping portion between the slot insulation portion 401 and the end insulation portion 402, this may lead to a reduction in torque.

[0025] In contrast, in the rotating electric machine 1 according to the embodiment, the slot insulating portions 401 and the end insulating portions 402 of the insulating member 40 are integrally formed, so there are no overlaps or seams between the slot insulating portions 401 and the end insulating portions 402. Therefore, in the rotating electric machine 1 according to the embodiment, the insulation between the rotor coil 26 and the salient rotor poles 24 (rotor core 22) can be ensured by the insulating member 40 while keeping the size of the rotor coil 26 small.

[0026] Further, the slot insulating portion 401 and the end insulating portion 402 in the insulating member 40 have a first flange-shaped portion 410 provided adjacent to the slot coil portion 261 and the coil end portion 262 on the radial outer side of the slot coil portion 261 and the coil end portion 262, and a second flange-shaped portion 420 provided adjacent to the slot coil portion 261 and the coil end portion 262 on the radial inner side of the slot coil portion 261 and the coil end portion 262. The first flange-shaped portion 410 and the second flange-shaped portion 420 are molded integrally with the slot insulating portion 401 and the end insulating portion 402, respectively. As a result, the insulation between the slot insulating portion 401 and the coil end portion 262 and the rotor salient pole 24 (rotor core 22) in the radial direction of the rotor 20 can be ensured by the first flange-shaped portion 410 and the second flange-shaped portion 420.

[0027] In addition, in the rotating electric machine 1 according to the embodiment, the first flange-shaped portion 410 is provided adjacent to the slot coil portion 261 and the coil end portion 262 on the radially outer side of the slot coil portion 261 and the coil end portion 262. Therefore, even if a centrifugal force is applied to the slot coil portion 261 and the coil end portion 262 in the radially outward direction during rotation of the rotor 20, the slot coil portion 261 and the coil end portion 262 come into contact with the first flange-shaped portion 410, and the radially outward movement is restricted. This makes it possible to suppress the occurrence of positional deviation of the rotor coil 26 due to the centrifugal force during rotation of the rotor 20. In particular, since the coil end portion 262 protrudes outward in the axial direction from the rotor salient pole 24 (rotor core 22), the first flange-shaped portion 410 can effectively suppress positional deviation of the coil end portion 262 due to the centrifugal force. [Explanation of symbols]

[0028] 1 Rotating Electric Machine 10 Stator 12 Stator core 14 Teeth 16 Stator coil 18 Slots 20 Rotors 22 Rotor core 24 rotor salient pole 26 Rotor coil 28 Slots 30 Shaft 40 Insulating materials 261 Slot coil section 262 Coil end 401 Slot insulation 402 End insulation part 410 First flange-shaped portion 420 Second flange-shaped portion

Claims

[Claim 1] A rotor is disposed opposite the stator and rotates together with the rotary shaft, the rotor is a rotating electric machine having a rotor core with a plurality of salient rotor poles and slots formed between adjacent salient rotor poles, and a rotor coil wound around the salient rotor poles through the slots with an insulating member interposed therebetween, The rotor coil has a slot coil portion located inside the slot and a coil end portion protruding beyond an axial end face of the rotor core, the insulating member has a slot insulating portion provided between the slot coil portion and the rotor salient pole in the circumferential direction of the rotor core, and an end insulating portion provided between the coil end portion and the rotor salient pole in the axial direction of the rotor core, the slot insulating portion and the end insulating portion being integral with each other, the insulating member has a first flange-shaped portion provided radially outward of the slot coil portion and the coil end portion and integral with the slot insulating portion and the end insulating portion, and a second flange-shaped portion provided radially inward of the slot coil portion and the coil end portion and integral with the slot insulating portion and the end insulating portion, the first flange-shaped portion is provided between the slot coil portion and the rotor salient pole on a radially outer side of the rotor core in contact with the rotor salient pole, the second flange-shaped portion is provided between the slot coil portion and the rotor salient pole on a radially inner side of the rotor core in contact with the rotor salient pole; A rotating electric machine characterized by:

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