A Seamless Magnetization State Transition Strategy for Variable Flux Machines Based on Direct Flux Vector Control

This paper proposes a control strategy for regulating the Magnetization State (MS) of Variable Flux Machines (VFMs) under load conditions, avoiding torque perturbations caused by the required high-amplitude magnetization current pulses. The proposed approach is implemented as a modification of a standard Direct Flux Vector Control (DFVC) scheme, adjusting the flux magnitude control law. MS manipulation is achieved through calibrated flux pulses derived from precomputed magnetization maps. The proposed control scheme is validated through simulation based on a prototype surface-PM Variable Flux Machine.