JP-2026074544-A - Rotating electric machine

Abstract

[Problem] To provide a rotating electric machine that can suppress the decrease in rotational efficiency. [Solution] The rotating electric machine 1 comprises a stator core 10, a rotor core 20, and a coil 30 composed of conductors 31. The stator core 10 has a plurality of teeth 11 arranged along the circumferential direction D2 of the stator core 10, and the teeth 11 have two end faces 12a, 12b spaced apart in the axial direction D3 of the stator core 10, and the conductor 31 is wound around the teeth 11 through the end faces 12a, 12b, and the coil 30 has a first point P located on one edge of the end faces 12a, 12b in the circumferential direction D2 and a second point Q located on the other edge of the end faces 12a, 12b in the circumferential direction D2, and at least a second portion 33 between the first point P and the second point Q extends in the radial direction D1 or substantially radial direction D5, and at least the second portion 33 is aligned with the second rotor portion 22 in the axial direction D3, and the coil 30 is not folded back in the radial direction D1 at the end faces 12a, 12b. [Selection Diagram] Figure 4

Inventors

• 藤田 康平

Assignees

• 株式会社豊田自動織機

Dates

Publication Date

20260507

Application Date

20241021

Claims (4)

1. A rotating electric machine comprising a stator core having an annular shape, a rotor core rotatably disposed relative to the stator core, and a coil made of conductive wires, The stator core has a plurality of teeth arranged along the circumferential direction of the stator core, The tooth portion has two end faces that are spaced apart in the axial direction of the stator core, The rotor core has a first rotor portion arranged radially with respect to the stator core, and a second rotor portion arranged axially with respect to the stator core. The aforementioned conductor is wound around the tooth portion, passing through the end face. The coil has a first point located on one circumferential edge of the end face and a second point located on the other circumferential edge of the end face. At least a portion between the first point and the second point extends in the radial or substantially radial direction, At least one portion of the above is aligned with the second rotor portion in the axial direction, The coil is a rotating electric machine in which the end face is not folded back in the radial direction.
2. The rotating electric machine according to claim 1, wherein at either of the two end faces, the coil has a first portion extending in the circumferential or substantially circumferential direction and a second portion extending in the radial or substantially radial direction.
3. The rotating electric machine according to claim 2, wherein the coil has the first portion and the second portion at the other of the two end faces.
4. The rotating electric machine according to claim 2, wherein the coil extends in the circumferential or substantially circumferential direction at the other of the two end faces.

Description

This invention relates to a rotating electric machine. For example, Patent Document 1 discloses a rotary electric motor (rotating electric machine). This rotary electric motor comprises a stator core, a rotor having a first rotor element arranged radially around the stator core and receiving magnetic force, and a second rotor element arranged axially around the stator core and receiving magnetic force, and a coil wound around the stator core such that magnetic flux penetrates radially from the end face of the stator core facing the first rotor element, and having a coil end portion that extends outward from the axial end face of the stator core. The coil end portion is curved radially and, when viewed from the axial direction, overlaps with the second rotor element. Japanese Patent Publication No. 2019-193485 This is a cross-sectional view showing a rotating electric machine according to the first embodiment of the present invention.This is a plan view showing a coil with one layer of wire wound around the teeth of the stator core, along with a portion of the stator core.This is a plan view showing a coil with multiple layers of wire wound around the teeth of the stator core, along with a portion of the stator core.This is an enlarged perspective view showing the stator core with one turn of coil wire wound around the teeth.This is an enlarged perspective view showing the state in which the coil wire is wound around the teeth of the stator core of a rotating electric machine according to a comparative example.This is an enlarged perspective view showing the state in which the coil wire is wound around the teeth of the stator core of the rotating electric machine according to the second embodiment by one turn. The embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, identical or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted. (First Embodiment) Figure 1 is a cross-sectional view showing a rotating electric machine 1 according to a first embodiment of the present invention. Figure 2 is a plan view showing a coil 30 in which a single layer of conductor wire 31 is wound around the teeth 11 of the stator core 10, together with a part of the stator core 10. The rotating electric machine 1 is, for example, a motor that rotates using a three-phase alternating current. In one example, the rotating electric machine 1 is a radial gap motor. The rotating electric machine 1 comprises a stator core 10, a rotor core 20, a coil 30, and a rotating shaft 40. The stator core 10 has an annular shape. Figure 1 shows a cross-section of the stator core 10 along the radial direction D1. The radial direction refers to the direction toward or away from the central axis L of the rotation axis 40, in a plane perpendicular to the central axis L of the rotation axis 40. The radial direction D1 may also be perpendicular to the central axis of the annular stator core 10. The "inside of radial direction D1" refers to the side facing the central axis L in radial direction D1. For example, the inside of radial direction D1 is the side of the rotation axis 40 relative to the stator core 10. The "outside of radial direction D1" refers to the side away from the central axis L in radial direction D1. For example, the outside of radial direction D1 is the side opposite the rotation axis 40 relative to the stator core 10. The circumferential direction refers to the direction along the axis centered on the central axis L of the rotation axis 40. The circumferential direction D2 may also be the direction along the axis centered on the central axis of the annular stator core 10. The axial direction refers to the direction along the central axis L of the rotation axis 40. The central axis L may be the central axis of the stator core 10 or the central axis of the rotor core 20. The radial direction D1, circumferential direction D2, and axial direction D3 are for illustrative purposes only and do not limit the position or orientation of the object. In the rotating electric machine 1, a rotating magnetic field is generated when current is applied to the stator, including the stator core 10. In the rotating electric machine 1, the rotor, including the rotor core 20, rotates due to the rotating magnetic field of the stator. As the rotor rotates, the rotating shaft 40 rotates. The rotating shaft 40 is, for example, cylindrical or rod-shaped. The rotating shaft 40 is rotatably supported in the housing (not shown) by bearings (not shown). The length of the rotating shaft 40 in the axial direction D3 is longer than the length of the rotor core 20 in the axial direction D3. The stator core 10 is housed inside the housing. For example, the stator core 10 is fixed to the inner surface of the housing. The stator core 10 is positioned radially outward from the rotation axis 40 by a distance D1. The stator core 10 is arranged to surround the rot