Minimum Copper Loss Control of Three-Phase Four-Leg PMSM Servo Systems Considering High Resistance Connection

Due to the high power density, the three-phase four-leg permanent-magnet synchronous machine (PMSM) system is considered to be competitive for aerospace servo applications. In this article, the copper loss under various impedance conditions is obviously reduced and the system operation is restored under the condition of high-resistance connection (HRC). Four closed-loop forms of three-phase voltage control are adopted to solve the problem of redundancy and ensure the consistency of performance in the pre-fault and post- fault operations.