Rotor punching sheet, rotor iron core, motor and compressor

Abstract

The invention provides a rotor punching sheet, a rotor iron core, a motor and a compressor. The rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a first magnetic steel groove, and at least one side groove wall of the first magnetic steel groove is provided with a first through-flow groove group and two second through-flow groove sets which are communicated with the first magnetic steel groove. The two second through-flow groove sets are located at the two ends of the first through-flow groove set respectively and correspond to the two length ends of the magnetic steel, the first through-flow groove set comprises first through-flow grooves, the second through-flow groove sets comprise second through-flow grooves, and the through-flow area of the first through-flow grooves is smaller than that of the second through-flow grooves. The heat dissipation effect of the two ends of the magnetic steel is guaranteed, the temperature of the magnetic steel especially the two ends is reduced, the demagnetization resistance of the magnetic steel is improved, demagnetization of the magnetic steel is effectively prevented, the demagnetization resistance current is increased, meanwhile, the design margin of the motor rotor can be increased through improvement of the demagnetization resistance of the magnetic steel, and the stacking height of the motor rotor is reduced, so the design cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a rotor punch, a rotor iron core, a motor and a compressor. Background technique [0002] Most of the existing variable frequency compressor motors use permanent magnet synchronous motors, and the permanent magnets in the rotors used for excitation (generating permanent magnetic fields) are widely used in rare earth materials such as NdFeB. Demagnetization will occur under the current (high temperature or high current can cause demagnetization alone or at the same time, the higher the temperature of the magnetic steel, the smaller the current required), the demagnetization of the magnetic steel means the reduction of the residual magnetism of the magnetic steel itself, and the magnetic performance declines. The anti-demagnetization ability of magnetic steel directly affects the operating performance and reliability of motors and compressors. [0003] The ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the present invention provides a rotor punch, a rotor core, a motor, and a compressor, which can overcome the disadvantages in the related art that the ventilation holes on the rotor core cannot require heat dissipation of the magnet steel to cause demagnetization of the magnet steel

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