Rotor structure, motor and compressor

By setting long trumpet-shaped magnetic isolation holes in the rotor structure, the direction of the magnetic circuit and the distribution of the magnetic field are changed, the problem of large noise and vibration of the motor is solved, and the optimization of the motor vibration noise and performance is achieved.

CN115912706BActive Publication Date: 2025-09-19GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Application Number
CN202310006784.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-04
Publication Date
2025-09-19
Estimated Expiration
2043-01-04

AI Technical Summary

Technical Problem

In existing motors, the air gap magnetic flux density is trapezoidal due to the magnetic steel arrangement structure, and the harmonic content is high, resulting in large motor noise and vibration.

Method used

A rotor structure is designed. Permanent magnets are installed in multiple magnetic steel slots on the rotor core. Magnetic isolation holes are provided between the magnetic steel slots and the outer circle of the rotor core. The magnetic isolation holes are long and trumpet-shaped and symmetrically distributed, which changes the direction of the magnetic circuit and the magnetic field distribution, and reduces the harmonic content of the air gap magnetic density.

Benefits of technology

It effectively reduces the harmonic distortion rate of the motor, improves the sinusoidalization of the air gap magnetic density, reduces the vibration noise of the motor, and increases the reluctance torque and the weak magnetic speed range.

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Abstract

The present invention provides a rotor structure, a motor, and a compressor, wherein the rotor structure includes a rotor core, wherein a plurality of magnetic steel slots are provided on the rotor core along the circumference of the rotor core in a cross section thereof, wherein permanent magnets are installed in the magnetic steel slots, and a plurality of magnetic isolation holes are provided between the magnetic steel slots and the outer circle of the rotor core, wherein the plurality of magnetic isolation holes are symmetrically arranged about the d-axis, wherein the magnetic isolation holes have a first end facing the outer peripheral wall of the rotor core and a second end facing away from the outer peripheral wall of the rotor core, wherein the width of the second end of the magnetic isolation hole is greater than the width of the first end, and wherein the width of the first end of the plurality of magnetic isolation holes increases successively along the direction from the d-axis to the q-axis. According to the present invention, the defects of large noise and vibration in the motor in the prior art can be overcome, the direction of the magnetic circuit and the distribution of the magnetic field can be effectively changed, the air gap magnetic density can be sinusoidalized, and the harmonic content of the air gap magnetic density can be reduced.
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