Dynamic model for HEPM motors including the nonlinear magnetic characteristics

Hybrid excited permanent magnet synchronous motors represent a cutting-edge technology that combines the strengths of permanent magnets with the controllability of an wounded rotor motor. While this presents a unique opportunity for high-performance machines, it also presents a challenge in terms of modeling the current-to-flux-linkage characteristics due to the additional degree of freedom and nonlinearities arising from iron saturation and magnetic cross-couplings. Accurate dynamic models for hybrid excited machines require the inversion of the characteristics. A comprehensive review of state-of-the-art models is presented, and a novel current-based dynamic model that accounts for all magnetic cross-couplings is proposed. The proposed model not only surpasses existing models in terms of accuracy but also enables simulation of phenomena crucial for sensorless applications. The validity of the proposed model is rigorously established through experimental measurements on a prototype machine.