voltage difference-based field-weakening control of double-rotor hybrid excitation axial flux switching permanent magnet motor

This paper investigates the operational performance of a novel double-rotor hybrid excitation axial flux switching permanent magnet (drhe-afspm) machine, combining the strengths of flux-switching machines and hybrid excitation synchronous machines. the study analyzes the machine’s structure and magnetic field adjustment principles, including inductance and flux linkage characteristics. a mathematical model is derived and a vector control-based drive system is established. the loading capacity of the drhe-afspm motor is examined at low speeds using an id = 0 control approach based on a stage control strategy. for high-speed operation, a field-weakening control strategy is implemented, with the field-weakening moment determined based on the voltage difference. simulations and experimental results demonstrate the drhe-afspm motor’s ability to fully utilize its torque with id = 0 control, highlighting its strong load capacity. compared to speed-based field-weakening control strategies, the voltage difference-based approach offers improved inverter output voltage utilization and a broader speed regulation range. these findings suggest that the drhe-afspm motor is a promising candidate for in-wheel motor applications in electric vehicles (evs).