CN-122001110-A - Stator punching sheet, stator core, stator and permanent magnet synchronous motor

Abstract

The application discloses a stator punching sheet, a stator core, a stator and a permanent magnet synchronous motor, wherein the stator punching sheet comprises a plurality of stator teeth distributed along the circumferential direction and stator grooves formed by adjacent stator teeth, the stator grooves are provided with a plurality of stator teeth, each stator tooth comprises a main body tooth part and tooth shoes respectively connected to two sides of the inner end part of the main body tooth part, the two sides of the inner end wall of the main body tooth part are respectively provided with a sawtooth section, and the tooth shoes on the two sides of the inner end part of the main body tooth part are respectively provided with a magnetism isolating hole. The application is provided with the sawtooth section and the magnetism isolating hole, which can effectively reduce radial electromagnetic force generated by magnetic field harmonic wave of the motor, greatly reduce the possibility of deformation of the stator core, reduce ineffective harmonic content in an air gap, reduce torque fluctuation of the motor, optimize vibration noise, reduce magnetic density of the stator tooth shoe, reduce core loss and improve motor efficiency.

Inventors

• LUO WEN
• LIU XIANYI
• LI KUN

Assignees

• 珠海凌达压缩机有限公司

Dates

Publication Date

20260508

Application Date

20260303

Claims (10)

1. 1. The stator punching sheet is characterized by comprising a plurality of stator teeth distributed along the circumferential direction and stator grooves formed by adjacent stator teeth, wherein the stator grooves are formed by a plurality of stator teeth; The stator tooth comprises a main body tooth part and tooth boots respectively connected to two sides of the inner end part of the main body tooth part, saw tooth sections are respectively arranged on two side parts of the inner end wall of the main body tooth part, and magnetism isolating holes are respectively arranged on the tooth boots on two sides of the inner end part of the main body tooth part.
2. 2. The stator plate of claim 1, wherein the serrations of the serration segments form an included angle α,126 ° or more α or less than 136 °; The distance between the saw tooth tips of the saw tooth sections and the center of the stator punching sheet is R1, and the distance between the saw tooth bottoms of the saw tooth sections and the center of the stator punching sheet is R2, wherein R1 is less than R2, and R1/R2 is less than 0.995 and less than 0.978.
3. 3. The stator punching sheet according to claim 1, characterized in that the magnetism isolating holes on the tooth shoe comprise a first magnetism isolating hole and a second magnetism isolating hole, The first magnetism isolating hole is formed in the middle of the tooth boot, the second magnetism isolating hole is formed in the joint of the tooth boot and the main body tooth portion, and the size of the first magnetism isolating hole is larger than that of the second magnetism isolating hole.
4. 4. A stator punching sheet according to claim 3, wherein two of the second magnetism isolating holes on the tooth shoe are arranged at intervals; the first magnetism isolating holes and the second magnetism isolating holes are round holes, and the diameters of the first magnetism isolating holes are The diameter of the second magnetism isolating hole is Wherein, 0.45 is less than or equal to / ≤0.55。
5. 5. The stator lamination of claim 1, wherein two of the shoes on adjacent stator teeth in close proximity form a notch of the stator slot, the shoes being provided with semicircular grooves at the notch of the stator slot.
6. 6. The stator plate of claim 2 wherein the body teeth are formed with a plurality of flux guide slots adjacent each of the saw tooth segments.
7. 7. The stator compact according to claim 6, wherein the magnetic flux trimming slot is provided on the main body tooth at a position corresponding to a serration point of the serration section; The distance between the engagement point of the main body tooth part and the tooth shoe, which is far away from the center of the stator punching sheet, and the center of the stator punching sheet is R3, R2 is less than R3, the length range of the magnetic beam trimming groove is arranged at the position of 0.98< R2/R3 is less than 0.93, and the width of the magnetic beam trimming groove is less than the distance between two adjacent sawtooth tips of the sawtooth section.
8. 8. A stator core comprising a plurality of stator laminations as claimed in any one of claims 1 to 7.
9. 9. A stator comprising the stator core of claim 8.
10. 10. A permanent magnet synchronous motor comprising a stator according to claim 9.

Description

Stator punching sheet, stator core, stator and permanent magnet synchronous motor Technical Field The application relates to the technical field of motors, in particular to a stator punching sheet, a stator core, a stator and a permanent magnet synchronous motor. Background In a motor of a rotary direct current variable frequency compressor, a stator is used as a core for stably running or not, and the design of stator punching sheets is particularly important. The motor of the rotary DC variable frequency compressor usually adopts a DC brushless permanent magnet synchronous motor, the design of stator punching sheets adopted by the stator of the existing DC brushless permanent magnet synchronous motor is mostly simpler and unreasonable, so that a composite magnetic field of the combined action of a stator magnetic field and a rotor magnetic field can generate more useless harmonic waves, the larger harmonic wave content can directly generate certain torque pulsation and vibration noise, the power of the motor is increased, the efficiency is reduced, the radial electromagnetic force generated by the harmonic wave of the motor magnetic field is also larger, and when the acting force exceeds the deformation resistance (or long-term repeated action) of an iron core material, the elastic deformation and even the plastic deformation of the iron core are caused, and therefore, the stator iron core is easy to deform, and the operation safety of the motor is reduced. Disclosure of Invention The stator punching sheet is provided with the sawtooth sections and the magnetism isolating holes, so that radial electromagnetic force generated by magnetic field harmonic waves of the motor can be effectively reduced, the possibility of deformation of the stator core is greatly reduced, invalid harmonic content in an air gap can be reduced, torque fluctuation of the motor is reduced, vibration noise is optimized, meanwhile, magnetic density of stator tooth shoes is reduced, core loss is reduced, and motor efficiency is improved. In order to achieve the above object, in a first aspect, the present application provides a stator punching sheet, including a plurality of stator teeth distributed along a circumferential direction and stator slots formed by adjacent stator teeth, where the stator slots have a plurality of stator slots; The stator tooth comprises a main body tooth part and tooth boots respectively connected to two sides of the inner end part of the main body tooth part, saw tooth sections are respectively arranged on two side parts of the inner end wall of the main body tooth part, and magnetism isolating holes are respectively arranged on the tooth boots on two sides of the inner end part of the main body tooth part. In the implementation process of the technical scheme, the stator punching sheet is respectively provided with the sawtooth sections on the two side parts of the inner end wall of the main body tooth part of the stator tooth, so that the magnetic field distribution can be changed, the magnetic circuit is optimized, the harmonic frequency is increased, specific harmonic is restrained, and the tooth shoes on the two sides of the inner end part of the main body tooth part of the stator tooth are respectively provided with the magnetism isolating holes, so that the harmonic magnetic circuit can be effectively blocked, the harmonic magnetic field is weakened, the amplitude of radial force wave is restrained, the vibration noise is reduced, the frequency characteristic of force wave is optimized, the resonance risk is avoided, the motor applying the stator punching sheet can effectively reduce the radial electromagnetic force generated by the harmonic wave of the magnetic field of the motor, greatly reduce the possibility of deformation of a stator core, and also reduce the ineffective harmonic content in an air gap, reduce the torque fluctuation of the motor and optimize the vibration noise, and simultaneously reduce the magnetic density of the stator tooth shoes, reduce the core loss and improve the efficiency of the motor and the service performance of the motor. In the preferred embodiment of the application, the included angle formed by the sawteeth of the sawteeth section is alpha, and alpha is more than or equal to 126 degrees and less than or equal to 136 degrees; The distance between the saw tooth tips of the saw tooth sections and the center of the stator punching sheet is R1, and the distance between the saw tooth bottoms of the saw tooth sections and the center of the stator punching sheet is R2, wherein R1 is less than R2, and R1/R2 is less than 0.995 and less than 0.978. In the implementation process of the technical scheme, the design of the included angle formed by the sawteeth of the sawtooth section can optimize torque pulsation and cogging torque peak value when the motor operates, the design of the size of the sawteeth of the sawtooth section is quite reasonable, the phenomenon that the hi