CN-115250017-B - Stator

CN115250017BCN 115250017 BCN115250017 BCN 115250017BCN-115250017-B

Abstract

A stator (20) is provided with a stator core (21), wherein the stator core (21) is divided into an annular core back (25) and teeth (26) protruding from the inner peripheral side of the core back (25), and an end plate (22), and the end plate (22) is fastened and presses at least one end side in the axial direction of the core back (25) and the teeth (26).

Inventors

DEGUCHI JUN-ICHI

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260512
Application Date: 20220414
Priority Date: 20210428

Claims (1)

1. A stator, wherein: A stator core divided into an annular core back portion and teeth protruding from an inner peripheral side of the core back portion, and An end plate that is axially fastened and presses the core back and the teeth, The core back has a larger core loss than the teeth, The end plate is formed to have a step in which a surface of the end plate facing the stator core is formed of a facing surface that fastens and presses the core back and a facing surface that fastens and presses the teeth, and the facing surface of the end plate that fastens and presses the core back protrudes toward the stator core than the facing surface of the end plate that fastens and presses the teeth.

Description

Stator The present application claims priority from japanese patent application No.2021-075760, filed 28, 4, 2021, which is incorporated herein by reference in its entirety, including the specification, claims, drawings and abstract. Technical Field The present disclosure relates to a stator equipped with a stator core divided into a core back and teeth. Background The stator is a fixed part of a rotating electrical machine, and is provided with a stator core formed by stacking steel plates and a stator coil wound around the stator core. The stator core has an annular back yoke (core back) and teeth protruding from an inner peripheral side of the back yoke. The divided stator core (divided core) is configured by being divided into, for example, a back yoke and teeth. Japanese patent application laid-open publication No. 2019-068567 discloses a split core in which a plurality of recesses are provided along the inner periphery of an annular back yoke, and the base ends of teeth are fitted into the recesses of the back yoke. Disclosure of Invention However, the stator core is press-fitted and fixed to the casing of the rotating electric machine by press fitting or the like. At this time, by applying a radial pressurizing force generated by press-fitting to the stator core, in-plane stress is generated in the stator core, and the core loss of the stator core increases. In the stator core divided into the core back and the teeth, in-plane internal stress is generated in each of the core back and the teeth in a state where the stator core is fixed to the case by press-fitting, and the core loss of the stator core increases. Accordingly, the present disclosure provides a stator capable of suppressing core losses of the core back and teeth, respectively, in a stator core divided into the core back and the teeth. Means for solving the problems The stator according to the present disclosure is characterized by being provided with a stator core divided into an annular core back and teeth provided so as to protrude from the inner peripheral side of the core back, and an end plate that is fastened in the axial direction and presses the core back and the teeth. In the stator according to the present disclosure, preferably, the core back is larger in core loss than the teeth, and a face of the end plate that is fastened to and presses the core back protrudes toward the stator core than a face of the end plate that is fastened to and presses the teeth. In the stator according to the present disclosure, it is preferable that the core back portion has a larger core loss than the teeth, and the length of the core back portion in the axial direction before being fastened and pressed by the end plate is longer than the length of the teeth in the axial direction before being fastened and pressed by the end plate. ADVANTAGEOUS EFFECTS OF INVENTION According to the stator of the present disclosure, it is possible to suppress core losses of the core back and the teeth while generating out-of-plane stresses of the core back and the teeth of the stator core divided into the core back and the teeth, respectively. Drawings Fig. 1 is a schematic diagram showing a rotary electric machine according to an embodiment. Fig. 2 is a perspective view showing a stator as an example of the embodiment. Fig. 3 is a graph showing the relationship between in-plane stress and out-of-plane stress of the stator core and core loss. Fig. 4A is a perspective view showing a stator as another example of the embodiment. Fig. 4B is a cross-sectional view AA of fig. 4A. Fig. 5A is a perspective view showing a stator as another example of the embodiment. Fig. 5B is a sectional view of BB showing fig. 5A. Detailed Description The embodiments of the present disclosure will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, and the like are examples for easy understanding of the present disclosure, and may be appropriately changed according to the application, purpose, specification, and the like. A rotary electric machine 10 equipped with a stator 20 as an example of the embodiment will be described below with reference to fig. 1 and 2. Fig. 1 is a schematic diagram showing a rotary electric machine 10. Fig. 2 is a perspective view showing the stator core 21 of the stator 20. Next, the rotation shaft 11 of the rotary electric machine 10 will be described in terms of the circumferential direction and the radial direction in the axial direction. The rotating electrical machine 10 is a device equipped with a stator 20 according to the present disclosure. The rotating electrical machine 10 is mounted in an electric vehicle such as a hybrid vehicle or an electric vehicle. The rotating electrical machine 10 functions as an electric motor by means of electric power supplied from a battery (not shown) during power running, drives wheels of an electric vehicle, functions as a generator during braking, recov