Motor rotor structure and permanent magnet motor

Abstract

The invention relates to the technical field of motors, in particular to a motor rotor structure. The motor rotor structure comprises a rotor iron core; a plurality of radial grooves are formed in a circumferential direction; a first magnetic isolation groove is formed between the two adjacent radial grooves; two permanent magnets with different coercive forces are installed in each radial groove;the two permanent magnets with the different coercive forces are distributed in a radial direction of the rotor iron core; the two permanent magnets with the different coercive forces are magnetizedin a tangential direction of the rotor iron core; a second magnetic isolation groove is formed between the two permanent magnets with the different coercive forces; when magnetization directions of the two permanent magnets with the different coercive forces are opposite, the rotor iron core is in a multi-magnetic-pole state; and when the magnetization directions of the two permanent magnets withthe different coercive forces are same, the rotor iron core is in a few-magnetic-pole state. The motor rotor structure can adjust an internal magnetic field according to an operating condition of a motor, so that the rotor iron core comprises the multi-magnetic-pole state and the few-magnetic-pole state, an efficient area of the motor is expanded, and the operation range of the motor is expanded.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a motor rotor structure and a permanent magnet motor. Background technique [0002] The permanent magnet synchronous motor with adjustable magnetic flux can adjust the strength of the internal magnetic field of the motor according to the load condition of the motor. Traditional permanent magnet motors rely on permanent magnets to provide magnetic flux, but permanent magnets provide a fixed magnetic field, and the internal magnetic field of the motor is difficult to adjust, making it difficult for permanent magnet motors to take into account the efficiency at high and low frequencies. And in the case of a fixed power supply voltage, the maximum operating frequency of the motor is limited. At present, most permanent magnet motors can only expand the operating range through field-weakening control, but field-weakening control has problems such as increasing the copper loss of the mo...

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a motor rotor structure and a permanent magnet motor for the problems of increased copper loss, reduced motor efficiency, and limited speed range when the traditional permanent magnet motor expands its operating range through field-weakening control.

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