Control System for a Novel Dual-Rotor Permanent Magnet Synchronous Reluctance Motor Considering Torque Superposition

This paper proposes a control system for a dual-rotor permanent magnet synchronous reluctance motor (PM-ynRM) considering torque superposition, wherein the maximum values of magnetic torque and reluctance torque of the investigated motor meet at the same current phase angle. Due to the magnetic circuit change of the dual PM-SynRM, an electrical angle scan scheme is used to find the spatial position of the main flux linkage and dq-axis of the motor, and the mathematical model of the dual-rotor PM-SynRM is built. Then the maximum torque per ampere (MTPA) current trajectory is obtained. Verified by simulation, the mathematical model is consistent with the finite element analysis (FEA) results within the error tolerance. The control system proposed in this paper reduces the current by 34.3% compared to the conventional control system when outputting the rated torque.