Asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities

Abstract

The invention relates to an asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities, and belongs to the field of permanent magnet motors. The asynchronous starting permanent magnet synchronous motor rotor comprises a rotating shaft, a starting cage, a rotor iron core and the permanent magnets, wherein 2p VVV-shaped permanent magnet slots encircling the rotating shaft are uniformly formed in the rotor iron core; a first permanent magnet and a second permanent magnet are arranged in a first V-shaped slot; a third permanent magnet and a fourth permanent magnet are arranged in a second V-shaped slot; a fifth permanent magnet and a sixth permanent magnet are arranged in a third V-shaped slot; and magnetism isolation slots are reserved between the permanent magnets. On the premise that the stable-state running performance is not reduced, the cost of an asynchronous starting permanent magnet synchronous motor is effectively reduced, and the no-load air gap magnetic density waveform sine distortion rate is reduced; harmonic waves are effectively suppressed; the efficiency of the motor is improved; the torque ripple is reduced; and the vibration noise is reduced.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors, in particular to an asynchronous start permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities. Background technique [0002] The asynchronous start permanent magnet synchronous motor using rare earth permanent magnet materials is expensive because of the high price of rare earth materials, which makes the cost of rare earth permanent magnet motors high, which is not conducive to market promotion; The gap flux density waveform is relatively close to a square wave, and due to the existence of the stator and rotor slots, a large number of harmonics are introduced into the no-load air gap flux density, resulting in increased harmonic losses, affecting motor efficiency, and increasing torque fluctuations , so that the output of the motor is not stable, which in turn increases the vibration and noise. Contents of the invention purpose o...

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Problems solved by technology

[0002] The asynchronous start permanent magnet synchronous motor using rare earth permanent magnet materials is expensive because of the high price of rare earth materials, which makes the cost of rare earth permanent magnet motors high, which is not conducive to market promotion; The gap flux density waveform is relatively close to a square wave, and due to the existence of the stator and rotor slots, a large number of harmonics are introduced into the no-load air gap flux density, resulting in increased harmonic losses, affecting motor efficiency, and increasing torque fluctuations , so that the output of the motor is not stable, thereby increasing the vibration and noise

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