Stator

Abstract

To provide a stator capable of reducing eddy current loss while minimizing the number of parts to achieve minimization.SOLUTION: A stator includes: a stator core 11 in which slots 13 are formed between a plurality of teeth 12 arranged in a circumferential direction; segment coils 21, 22 having a plurality of connection parts 23 inserted into the slots 13 of the stator core 11 from both sides in an axial direction; and connection members 31 that connect the connection parts 23 of the segment coils 21, 22 within the slots 13, in which the connection members 31 contain a plurality of element wires 33 with insulating coating films inside.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a stator.

Background Art

[0002] Patent Document 1 discloses a rotating electrical machine stator having a stator core having a predetermined number of teeth arranged along the circumferential direction and a predetermined number of slots that are spaces between adjacent teeth, and a stator winding wound around the stator core, wherein a plurality of winding portions are arranged in the slots. In this stator, eddy current loss is reduced by using a collective conductor as the winding portion closest to the rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described stator that uses a collective conductor as the winding portion closest to the rotor, the number of parts increases, and miniaturization becomes difficult due to the increase in the number of parts.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a stator that can reduce eddy current loss while suppressing an increase in the number of parts and achieving miniaturization.

Means for Solving the Problems

[0006] To achieve the above object, the stator of the present invention includes a stator core in which slots are formed between a plurality of teeth arranged in the circumferential direction, and a segment coil having a plurality of connection portions inserted into the slots of the stator core from both axial sides. A connecting member that connects the connecting portions of the segment coils within the slot, is provided, The connecting member houses a plurality of stranded wires with insulating coatings inside.

[0007] According to the stator of this configuration, while suppressing an increase in the number of parts and achieving miniaturization, eddy current losses can be reduced by the plurality of stranded wires with insulating coatings housed inside the connecting member.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a stator that can suppress an increase in the number of parts and achieve miniaturization while reducing eddy current losses.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a stator 100 according to this embodiment. FIG. 2 is an exploded perspective view of segment coils 21, 22 and a connecting member 31.

[0011] As shown in FIGS. 1 and 2, the stator 100 according to this embodiment includes a stator core 11, segment coils 21, 22, and a connecting member 31.

[0012] The stator core 11 is formed in a substantially cylindrical shape. This stator core 11 is constituted, for example, by laminating a plurality of non-oriented electromagnetic steel sheets 11a formed in an annular shape by press working.

[0013] The stator core 11 has a plurality of teeth 12. These teeth 12 project toward the inner side in the radial direction, and the gap portions formed between the respective teeth 12 are slots 13.

[0014] The segment coils 21, 22 are formed by bending a plurality of rectangular wires which are conductors, and the surface of the rectangular wire is coated with an insulating coating made of, for example, an enamel resin or the like. These segment coils 21, 22 are formed in an annular shape and are assembled from both sides in the axial direction with respect to the stator core 11. The segments 21, 22 have a plurality of connection portions 23 formed of rectangular wires protruding on the assembly side to the stator core 11. For each segment 21, 22, the arrangement of the connection portions 23 arranged in the radial direction is arranged in the circumferential direction at the same pitch as the slots 13. Thereby, when the segment coils 21, 22 are assembled to the stator core 11, the connection portions 23 arranged in the radial direction are inserted into the slots 13 of the stator core 11 from both sides in the axial direction.

[0015] The connection member 31 is a member that connects the connection portions 23 of the segment coils 21, 22 inserted into the slots 13 of the stator core 11 from both sides in the axial direction within the slots 13.

[0016] FIG. 3 is a perspective view of a state before connection for explaining the connection between the connection portions 23 of the segment coils 21, 22 and the connection member 31. FIG. 4 is a perspective view of a connection state for explaining the connection between the connection portions 23 of the segment coils 21, 22 and the connection member 31.

[0017] As shown in FIGS. 3 and 4, the connecting member 31 that connects the connecting portions 23 of the segment coils 21 and 22 has a cylindrical portion 32 and a plurality of fine wires with insulating coatings 33. The cylindrical portion 32 is formed of a conductive metal material such as copper or a copper alloy, and is formed in a rectangular tube shape. The fine wires with insulating coatings 33 are accommodated inside the cylindrical portion 32 and are arranged at the center in the longitudinal direction. These fine wires with insulating coatings 33 are thin wires made of a conductive metal such as copper or a copper alloy, and are coated with an insulating coating. Note that the insulating coating is not limited to an organic material, and may be an inorganic material or an oxide.

[0018] At both ends of the cylindrical portion 32 of the connecting member 31, portions where the fine wires with insulating coatings 33 are not accommodated are formed as fitting recesses 34, and the connecting portions 23 of the segment coils 21 and 22 are fitted into these fitting recesses 34. Thereby, the connecting portions 23 of the segment coils 21 and 22 are connected by the connecting member 31.

[0019] The connecting portion 23 has a fitting end portion 24 whose tip side is exposed from the insulating coating, and by fitting this fitting end portion 24 into the fitting recess 34, it is connected to the connecting member 31. At the fitting end portion 24 of the connecting portion 23, each side surface 25 is a tapered surface 25a that gradually inclines toward the center toward the tip. Thereby, the tip portion of the fitting end portion 24 of the connecting portion 23 has a tapered shape that gradually narrows toward the tip. Thereby, when connecting the connecting portion 23 to the connecting member 31, the fitting end portion 24 is smoothly guided and fitted into the fitting recess 34.

[0020] To assemble the segment coils 21 and 22 to the stator core 11, first, the connecting member 31 is attached to the connecting portion 23 of either one of these segment coils 21 and 22.

[0021] Then, these segment coils 21 and 22 are assembled from both axial sides of the stator core 11, and the connection parts 23 of the respective segment coils 21 and 22 are inserted into the slots 13 of the stator core 11 from both axial sides. Thereafter, the segment coils 21 and 22 are pressed in the assembling direction to the stator core 11.

[0022] In this way, the other connection part 23 is connected to the connection member 31 attached to one of the connection parts 23 of the segment coils 21 and 22. Thereby, the connection parts 23 are connected to each other by the connection member 31. Then, by assembling the segment coils 21 and 22 to the stator core 11 and connecting the connection parts 23 by the connection member 31, the stator 100 is configured.

[0023] As described above, according to the stator 100 according to the present embodiment, the connection parts 23 of the segment coils 21 and 22 are connected within the slots 13 of the stator core 11 by the connection member 31 that houses a plurality of insulated stranded wires 32 therein. Thereby, while suppressing an increase in the number of parts and achieving miniaturization, the eddy current loss can be reduced by the plurality of insulated stranded wires 32 housed inside the connection member 31.

Description of Reference Numerals

[0024] 11 Stator core 12 Teeth 13 Slot 21, 22 Segment coils 23 Connection part 31 Connection member 33 Insulated stranded wire 100 Stator

Claims

【Claim 1】 A stator core having slots formed between a plurality of teeth arranged in the circumferential direction, A segment coil having a plurality of connection parts inserted into the slots of the stator core from both axial sides, A connection member for connecting the connection parts of the segment coil within the slots, Comprising: The connection member houses a plurality of stranded wires with insulating coatings inside, Stator.

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