A Novel Magnetization State Manipulation Strategy for Isolated Dual Three-Phase Variable Flux Memory Motor

The variable flux memory (VFM) motor can realize the online re-magnetization and demagnetization via d-axis armature current pulses. However, the corresponding pulse currents during magnetization state (MS) regulation lead to significant pulsating torque and speed fluctuations. In this paper, based on the segregated dual three-phase (DTP) VFM (DTP-VFM) motor, a new PM MS manipulation method based on step-by-step dual d-axis current pulses in single winding set, is proposed. The new method is compared with the traditional method based on dual-winding sets. The results reveal that the new step-by-step MS manipulation strategy is not only effective, but also exhibits enhanced pulsating torque and speed fluctuation suppression effect.