Motor rotor and permanent magnet motor

Abstract

The invention provides a motor rotor and a permanent magnet motor. The motor rotor includes a rotor core (1) and a plurality of magnetic poles arranged in the rotor core (1). Each magnetic pole includes a first permanent magnet (2) and a second permanent magnet (3). A coercive force of the first permanent magnet (2) is higher than that of the second permanent magnet (3), and a first magnetic separation groove (4) for separating the first permanent magnet (2) and the second permanent magnet (3) and guiding the magnetic field trend is disposed between the first permanent magnet (2) and the second permanent magnet (3). According to the motor rotor, the magnetic steel magnetizing and demagnetizing difficulty can be effectively reduced, and the motor efficiency 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. [0003] At present, most of the shortcomings of the internal magnetic field of permanent magnet motors are difficult to adjust, which leads to the limitation of the maximum speed of the motor by the input DC bus voltage and other factors, and the difficulty of taking into account the efficiency of the low-speed and high-speed operating regions of the motor. During the opera...

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

[0003] At present, most of the shortcomings of the internal magnetic field of permanent magnet motors are difficult to adjust, which leads to the limitation of the maximum speed of the motor by the input DC bus voltage and other factors, and the difficulty of taking into account the efficiency of the low-speed and high-speed operating regions of the motor. During the operation of the motor, the low coercivity magnetic field Steel is affected by high coercive force magnetic steel, which will increase the difficulty of charging and demagnetizing low coercive force magnetic steel, and reduce the efficiency of the motor

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