LAUSR

This article proposes a novel dual magnetizing current controller for variable flux memory machines (VFMMs) aiming to mitigate the speed fluctuation during magnetization state manipulation. Firstly, the magnetizing properties of the investigated hybrid magnet synchronous memory machine (HMSMM) are tested and researched offline. The effect of amplitude and time duration of the magnetizing current pulse on its magnetizing capability is investigated. Secondly, based on the dynamic mathematical model, a q-axis current pulse is injected to compensate the torque fluctuation caused by the d-axis magnetizing current pulse, which forms a dual magnetizing current controller during magnetization state manipulation. Then, the experiments are carried out on the investigated HMSMM control system. The measured results of the transient performance on both remagnetization and demagnetization show that the proposed dual magnetizing current controller can significantly mitigate the speed fluctuation and has better transient performance than the conventional single magnetizing current method.