Motor rotor and permanent magnet motor

Abstract

The invention provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor core and a plurality of magnetic poles arranged in the rotor core, each magnetic pole comprises a first permanent magnet, a second permanent magnet and a third permanent magnet, and the dimension relation of the first permanent magnet, the second permanent magnet and the third permanent magnet on the cross section of the rotor core meets m / 2>H1*Hcj1*L1 / [(H2*Hcj2*L2+1 / 2H3*Hcj2*L3)]>m / 10; wherein m is a multiple of the motor magnetism adjustment range, L1 is the length of the first permanent magnet, H1 is the width of the first permanent magnet, Hcj1 is the intrinsic coercive force of the first permanent magnet, L2 is the length of the second permanent magnet, H2 is the width of the second permanent magnet, Hcj2 is the intrinsic coercive force of the second permanent magnet, L3 is the length of the third permanent magnet, H3 is the width of the third permanent magnet, and Hcj3 is the intrinsic coercive force of the third permanent magnet. According to the motor rotor, the magnetizing and demagnetizing difficulty can be effectively reduced, the motor adjustment range is increased, andthe operation efficiency of the motor in magnetizing control is improved.

Description

Technical field [0001] The invention belongs to the technical field of motors, and specifically relates to a motor rotor and a permanent magnet motor. Background technique [0002] Traditional permanent magnet motors rely on permanent magnets to provide magnetic flux, but permanent magnets provide magnetic field fixation, 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 of high frequency and low frequency. 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. When the motor is in field increasing control, the operating efficiency of the motor will be reduced. Summary of the invention [0003] Therefore, the technical problem to be solved by the present invention is to provide a motor rotor and a permanent magnet motor,...

AI Technical Summary

Problems solved by technology

[0002] 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 of high frequency and low frequency

And when the power supply voltage is fixed, 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. When the motor is under field-increasing control, the operating efficiency of the motor will be reduced

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