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 (1) and a plurality of magnetic poles arranged in the rotor core (1), wherein each magnetic pole comprises a first permanent magnet (2), second permanent magnets (3) and third permanent magnets (4); each first permanent magnet (2) is arranged at the central position of the corresponding magnetic pole on which the first permanent magnet is located; the second permanent magnets (3) are arranged at two sides of each first permanent magnet (2); each third permanent magnet (4) is arranged at one side, far away from the first permanent magnet (2), of the corresponding second permanent magnet (3); the coercivity of the first permanent magnets (2) is smaller than that of the second permanent magnets (3) and that of the third permanent magnets (4); and each third permanent magnet (4) is arranged on a q axis of the motor. According to the motor rotor, the magnetization and demagnetization difficulties can be effectively reduced, the adjustable flux range of the motor is increased, and the operating efficiency of the motor during magnetization control is improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular 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 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. When the motor is under field-increasing control, the operating efficiency of the motor will be reduced. Contents 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 mo...

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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