Optimal Efficiency Current Trajectory Control of Permanent Magnet Synchronous Motor Considering Cross Coupling and Magnetic Saturation

Abstract

This paper proposes a current trajectory control strategy to achieve maximum efficiency control while considering cross coupling and magnetic saturation effect. The controllable electrical loss can be minimized by the optimal control of the armature current vector which take cross coupling and magnetic saturation effect into account. The proposed method obtains the stator current amplitude which leads to optimal efficiency base on the loss model which considering cross coupling and magnetic saturation. Then the optimal efficiency control of interior permanent magnet synchronous machines (IPMSM) is realized by using the optimal stator current and current incremental vector adjustment module which calculate the d-q axis current reference by calculating the current increment. Two control strategies based on optimal efficiency current trajectory control (OECTC) and maximum torque per ampere (MTPA) are analyzed. The results of the simulation show that the proposed control strategy has well static and dynamic performance, and the efficiency is improved in the entire operating region of the machine.