Abstract:

A dual-stator hybrid excitation permanent magnet (DSHEPM) motor with consequent-pole rotor structure was used to investigate the effects of AC excitation current on the electromagnetic force and vibration characteristics of the hybrid excitation motor. The magnetic flux distribution and air-gap magnetic density under different excitation conditions were analyzed by 2-dimensional finite element method. The Maxwell stress tensor method was employed to calculate the radial electromagnetic force. The electromagnetic force was decomposed using the 2-dimensional Fourier transformation (2DFFT) method. The vibration characteristic of the DSHEPM motor was analyzed by the mode superposition method based on multi-physics model. The results show that the phase angle of the excitation current has a significant impact on the electromagnetic force harmonics and the electromagnetic vibration can be decreased through the flux-weakening control. The research will contribute to the vibration suppression and optimization of the DSHEPM motor.

Key words: hybrid excitation, permanent magnet motor, vibration, excitation current, magnetic field regulation