CN-224218154-U - Stator and rotor structure of permanent magnet synchronous motor

Abstract

The application provides a stator and rotor structure of a permanent magnet synchronous motor, which comprises a rotor yoke, permanent magnets, a stator core, stator teeth and a stator winding, wherein the rotor yoke is of an annular structure, the permanent magnets are uniformly distributed on the inner wall of the rotor yoke in a ring-shaped structure and are positioned in the rotor yoke, the outer wall of the stator core is annularly provided with the outwardly protruding stator teeth, the tail ends of the stator teeth are provided with two auxiliary grooves, and the stator winding is arranged between the adjacent stator teeth. The application adopts the rectangular auxiliary groove and designs the permanent magnet as the cambered surface structure, thereby effectively improving the operation stability.

Inventors

• JING YAN
• ZHOU YANG

Assignees

• 苏州科德九天电子科技有限公司

Dates

Publication Date

20260508

Application Date

20250530

Claims (10)

1. 1. A stator-rotor structure of a permanent magnet synchronous motor, comprising: A rotor yoke having a ring-like structure; The permanent magnets are uniformly distributed on the inner wall of the rotor yoke in a ring manner; The stator iron core is in an annular structure, is positioned in the rotor yoke and keeps a concentric state with the rotor yoke, the outer side wall of the stator iron core is uniformly provided with outwardly protruding stator teeth, and the tail end of each stator tooth is provided with at least one auxiliary groove; and the stator windings are fixed in the stator slots in one-to-one correspondence with the stator slots.
2. 2. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein one surface of the permanent magnet is bonded to an inner wall of the rotor yoke.
3. 3. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the permanent magnet includes an upper arc surface and a lower arc surface, the upper arc surface and the lower arc surface being symmetrical about a center line of the permanent magnet.
4. 4. A stator and rotor structure of a permanent magnet synchronous motor according to claim 3, wherein an air-gap field waveform between the stator core and the permanent magnet has a sine shape.
5. 5. A stator and rotor structure of a permanent magnet synchronous motor according to claim 3, wherein the number of permanent magnets is 20, the radii of the upper and lower cambered surfaces are 40mm, the inner diameter of the rotor yoke is 80mm, and the outer diameter is 82mm.
6. 6. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the number ratio of the stator teeth to the permanent magnets is 9:10.
7. 7. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the stator teeth extend gradually outwards from the stator core, and the ends expand and stretch to two sides to form a T-shaped structure.
8. 8. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein each stator tooth is provided with two auxiliary grooves, and the two auxiliary grooves are symmetrically distributed relative to a center line of the stator tooth.
9. 9. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the auxiliary groove has a rectangular structure, a width of 0.5m and a depth of 1mm.
10. 10. The stator and rotor structure of a permanent magnet synchronous motor according to claim 1, wherein the stator winding is a fractional slot concentrated winding.

Description

Stator and rotor structure of permanent magnet synchronous motor Technical Field The application relates to the field of permanent magnet synchronous motors, in particular to a stator and rotor structure of a permanent magnet synchronous motor. Background The permanent magnet motor is widely applied to the fields of industrial driving, new energy automobiles and the like due to the advantages of high power density, high efficiency and the like. However, there are several key issues in the design of conventional permanent magnet motors that remain to be addressed. In the aspect of stator structural design, the prior art generally adopts a single physical slot structure, is limited by the matching relation of the stator slot number and the rotor pole number, and is difficult to effectively promote by the least common multiple. The defect causes longer cogging torque period and larger amplitude, so that obvious torque pulsation is generated in the running process of the motor, vibration noise is caused, and the control precision of the system is influenced. While some improvements have attempted to improve this problem by increasing the actual number of stator slots, they are limited by slot space utilization and manufacturing process, often resulting in material wastage or magnetic circuit saturation. On the other hand, the existing permanent magnet structural design has obvious technical bottlenecks. The conventional permanent magnet mostly adopts a flat-top or asymmetric cambered surface structure, and the design is easy to cause the distortion of the distribution of an air gap magnetic field and generate a higher harmonic component. Particularly in the process of attaching the permanent magnet to the surface of the stator core, the traditional design lacks effective modulation of magnetic field waveform, so that the sine of an air gap magnetic field is poor, and the torque fluctuation caused by the sine is severely restricted to the application performance of the motor in high-precision control occasions. In addition, the asymmetric pole structure can also cause unbalance of radial magnetic tension, further exacerbating mechanical vibration and affecting the service life of the bearing system. These inherent defects have become a major technical hurdle for restricting the development of permanent magnet motors to high stability and low noise. Disclosure of utility model Aiming at one of the defects in the prior art, the application aims to provide a stator and rotor structure of a permanent magnet synchronous motor. In a first aspect of the present application, there is provided a stator-rotor structure of a permanent magnet synchronous motor, comprising: A rotor yoke having a ring-like structure; The permanent magnets are uniformly distributed on the inner wall of the rotor yoke in a ring manner; the stator iron core is in an annular structure, is positioned in the rotor yoke and keeps a concentric state with the rotor yoke, the outer side wall of the stator iron core is uniformly distributed with outwardly protruding stator teeth, and the tail end of each stator tooth is provided with at least one auxiliary groove; and the stator windings are fixed in the stator slots in one-to-one correspondence with the stator slots. Optionally, one face of the permanent magnet is attached to an inner wall of the rotor yoke. Optionally, the permanent magnet includes an upper arc surface and a lower arc surface, and the upper arc surface and the lower arc surface are symmetrical about a center line of the permanent magnet. Optionally, the air-gap field waveform between the stator core and the permanent magnet has a sinusoidal shape. Optionally, the number of the permanent magnets is 20, the radii of the upper cambered surface and the lower cambered surface are 40mm, the inner diameter of the rotor yoke is 80mm, and the outer diameter is 82mm. Optionally, the ratio of the number of the stator teeth to the number of the permanent magnets is 9:10. Optionally, the stator teeth gradually extend outwards from the stator core, and the tail ends of the stator teeth are expanded and stretched to two sides to form a T-shaped structure. Optionally, each stator tooth is provided with two auxiliary grooves, and the two auxiliary grooves are symmetrically distributed relative to the central line of the stator tooth. Optionally, the auxiliary groove is of a rectangular structure, the width is 0.5m, and the depth is 1mm. Optionally, the stator winding is a fractional slot concentrated winding. The stator and rotor structure of the permanent magnet synchronous motor provided by the application adopts the technical means of adding the auxiliary groove, and brings the technical effect of improving the running stability of the motor. Other technical effects resulting from the additional features will be further elucidated in the respective embodiments. Drawings Other features, objects and advantages of the present application will become m