Closed loop MTPA control of interior permanent magnet synchronous motor
                                                         CAI Guoqing, YAO Wenxi, ZHANG Wei
                                    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the problem that the closedloop vector control system which is designed to work in maximum torque per ampere (MTPA) state below the base speed, may no longer satisfies the MTPA state when a step torque command or load is applied, the MTPA control and saturation limiting of controller of interior permanent magnet synchronous motor (IPMSM) were studied. The main cause is the saturation of current regulators, so a limiting strategy was proposed to optimize current track. On this basis, an improved MTPA control which take the daxis current loop as the MTPA correction loop was proposed. Matlab/Simulink simulation model was built, and the performance of the control scheme was carried out through the experimental platform based on TMS320F28335. The result indicate that when a step torque is applied, the given current of daxis is corrected according to the real current of qaxis, and the actual current trajectories in the dynamic process of the motor maintained near MTPA curve.

Key words: vector control; maximum torque per ampere control (MTPA); interior permanent magnet synchronous motor (IPMSM); limiting