US-12620843-B2 - Stator and rotary electric machine

US12620843B2US 12620843 B2US12620843 B2US 12620843B2US-12620843-B2

Abstract

A stator includes a stator core, an insulator, and a coil. The stator core includes: a yoke having an annular shape; and teeth protruding from the yoke to the inside of the yoke. The insulator covers at least a part of the stator core. The insulator includes: a first face facing the coil wound around the teeth; and a second face facing the yoke. The first face is perpendicular to the protrusion direction of the teeth. The second face includes: a first perpendicular face perpendicular to the protrusion direction of the teeth; and a first inclined face inclined toward the first face with respect to the first perpendicular face. The yoke includes an inner circumferential face facing the second face.

Inventors

Kenta Suzuki
NORITAKA ASO
Toshiyuki Tamamura
Yuya MAEDA

Assignees

PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20220527
Priority Date: 20210618

Claims (8)

1 . A stator, comprising: a stator core including a yoke having an annular shape, and teeth protruding from the yoke to an inside of the yoke; a first insulator covering at least a first part of the stator core and a part of a first tooth of the teeth; a second insulator covering at least a second part of the stator core and a part of a second tooth of the teeth adjacent to the first tooth; a first coil disposed around the first tooth via the first insulator; and a second coil disposed around the second tooth via the second insulator, wherein each of the first insulator and the second insulator includes a first face facing a corresponding one of the first coil and second coil, and a second face facing the yoke, the first face being perpendicular to a protrusion direction of the teeth, the second face including a first perpendicular face perpendicular to the protrusion direction of the teeth, and a first inclined face inclined toward the first face with respect to the first perpendicular face, and wherein the yoke includes an inner circumferential face facing the second face, and the first insulator is directly adjacent to the second insulator.
2 . The stator according to claim 1 , wherein the inner circumferential face of the yoke includes: a second perpendicular face being perpendicular to the protrusion direction of the teeth and facing the first perpendicular face; and a second inclined face being inclined toward the second face of one of the first insulator and the second insulator with respect to the second perpendicular face and facing the first inclined face.
3 . The stator according to claim 2 , wherein the second inclined face of the yoke is a flat face.
4 . The stator according to claim 2 , wherein the second inclined face of the yoke includes a curved face.
5 . The stator according to claim 2 , wherein the yoke further includes an outer circumferential face opposite the inner circumferential face, at least a part of the outer circumferential face of the yoke is an arc-shaped face having an arc-shaped cross section perpendicular to an axial direction of the yoke, and the second inclined face of the yoke is a face in an arc shape, the face having a cross section perpendicular to the axial direction, the cross section being in a shape of an arc concentric with the arc-shaped face of the yoke.
6 . The stator according to claim 2 , wherein the stator core includes N slots (the N being an integer not less than 2) each being a space between the teeth circumferentially adjacent to each other, and an angle θ formed by the second inclined face with the second perpendicular face satisfies 0°<θ≤(180/N)°.
7 . The stator according to claim 1 , wherein each of the first coil and second coil is formed of a winding having a rectangular cross section.
8 . A rotary electric machine, comprising: the stator according to claim 1 ; and a rotor disposed inside the stator and configured to rotate with respect to the stator.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a U.S. national stage application of the PCT International Application No. PCT/JP2022/021828 filed on May 27, 2022, which claims the benefit of foreign priority of Japanese patent application No. 2021-101895 filed on Jun. 18, 2021, the contents all of which are incorporated herein by reference. BACKGROUND 1. Technical Field The present disclosure generally relates to a stator and a rotary electric machine. More specifically, the present disclosure relates to a stator including an insulator and a rotary electric machine including the stator. 2. Description of the Related Art Patent Literature 1 discloses an electric motor including: a rotor rotatable about a rotation axis; and a stator including a stator core and a winding wound around the stator core. Citation List Patent Literature 1: WO 2018/020631 SUMMARY For such electric motor described in Patent Literature 1, there has been a demand to substantially prevent a reduction of the torque of the electric motor due to the saturation of magnetic flux density (magnetic saturation) in the stator. In view of the above-mentioned circumstances, an object of the present disclosure is to provide a stator and a rotary electric machine including the stator, the stator being capable of reducing the possibility of a reduction of the torque of the rotary electric machine. A stator according to one aspect of the present disclosure includes a stator core, an insulator, and a coil. The stator core includes an annular-shaped yoke and teeth protruding from the yoke to the inside of the yoke. The insulator covers at least a part of the stator core. The coil is disposed around at least one of the teeth via the insulator. The insulator includes a first face facing the coil and a second face facing the yoke. The first face is perpendicular to the protrusion direction of the teeth. The second face includes: a first perpendicular face perpendicular to the protrusion direction of the teeth; and a first inclined face inclined toward the first face with respect to the first perpendicular face. The yoke includes an inner circumferential face facing the second face. The rotary electric machine according to one aspect of the present disclosure includes the stator and a rotor. The rotor is disposed inside the stator and configured to rotate with respect to the stator. According to the present disclosure, there can be provided a stator and a rotary electric machine including the stator, the stator being capable of reducing the possibility of a reduction of the torque of the rotary electric machine. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a rotary electric machine according to an embodiment. FIG. 2 is a partial cross-sectional view of a stator according to the embodiment. FIG. 3 is a plan view of a main part of a stator according to Modification 1. FIG. 4 is a plan view of a main part of a stator according to Modification 2. FIG. 5 is a partial cross-sectional view of a stator according to other modifications. DETAILED DESCRIPTIONS Rotary electric machine 1 according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the embodiment and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiment and the modifications. In embodiments other than the following embodiment and modifications, various changes may be made according to design requirements and other conditions within a scope that does not deviate from the technical concept of the present disclosure. Furthermore, the drawings described in the following embodiment are schematic diagrams, hence the size and thickness proportions of constituents in the drawings are not necessarily actual dimensional proportions. Furthermore, the following embodiments (including the modifications) may be suitably implemented in combination. (1) OUTLINE First, the outline of rotary electric machine 1 of the present embodiment will be described with reference to FIG. 1 and FIG. 2. FIG. 1 is a cross-sectional view of rotary electric machine 1 according to the embodiment. FIG. 2 is a partial cross-sectional view of stator 2 according to the embodiment. As illustrated in FIG. 1, rotary electric machine 1 includes: stator 2; and rotor 3 disposed inside stator 2 and configured to rotate with respect to stator 2. A gap is provided between stator 2 and rotor 3, and rotor 3 rotates about rotation axis A1 in a non-contact manner with stator 2. As illustrated in FIG. 1 and FIG. 2, stator 2 includes stator core 20, insulator 4, and coil 5. Stator core 20 includes annular-shaped yoke 21 and teeth 22 (twelve teeth in the present embodiment) protruding from yoke 21 to the inside of yoke 21. Insulator 4 covers at least a part of stator core 20. Coil 5 is disposed around at least one of teeth 22 via insulator 4. Here, as illustrated in FIG. 2, insul