Control method for mono inverter dual parallel interior permanent magnet synchronous machine drive system

This paper proposes the novel control method for mono inverter dual parallel (MIDP) interior permanent magnet synchronous machine (IPMSMs) drive system. It includes maximum torque per ampere (MTPA) control method to elevate drive efficiency and active damping control method to alleviate inherent stability problem of MIDP motor drive system. Due to the combination of reluctance and electromagnetic torques, the d- and q- axis currents of IPMSM are coupled unlike those of induction and surface mounted permanent magnet machines. For this reason, MTPA and active damping control of MIDP IPMSM drive system are far more complex than those with non-salient motors. In this paper, model based mathematical analysis about MTPA and active damping control for MIDP IPMSM drive system are provided. Experimental results with two 1.6kW IPMSMs are presented to verify the proposed algorithm.