电机旋转磁场中磁致伸缩导致的振动频率特性

Noise suppression is a key issue in the design and application phases of the motor. The vibration caused by magnetostriction effect occupy a large proportion in large motors. The electromagnetic mechanical coupling numerical model of the motor firstly was established in this paper, and the stress of silicon steel sheet of motor stator core was analyzed by numerical simulation. It was found that the distribution of magnetic density at the top and root of the stator teeth was relatively concentrated, and high stress resulted from the magnetic circuit steering and distortion. Then an experiment was designed to verify the simulation results, and the vibration of the stator of the motor was measured. It was found that the maximum low-frequency force wave is single power frequency wave. Under the same measurement conditions, the vibration on the core of the three-phase transformer is measured, and it was found that the transformer has a distinct single power frequency wave at the turn of the core magnetic circuit.