Study on Smooth Transition Performance of PMSM MTPA Control and WFC Based on Single Current Loop

作者：Lina Luo, Xiangyu Yang, Zhidong Wang, Zifan Zhang · 发表于：2025 International Conference on Low Carbon and Smart Energy (ICLCSE) · 年份：2025 · DOI：10.1109/iclcse66889.2025.11389285

When mode switching between Maximum Torque Per Ampere (MTPA) Control and Weakening Field Control (WFC), there is a problem of sudden changes in D-axis and Q-axis currents for Permanent Magnet Synchronous motors (PMSM) under the WFC strategy with single current regulator (SCR), which leads to the problem of torque fluctuations. This paper presents a smooth transition strategy based on weight distribution in the overlap zone. By establishing a multi-objective optimization model under voltage-current constraints, the critical conditions for mode switching are derived, the S-shaped weighting function is designed to achieve smooth transition of current commands. Matlab/Simulink simulation results show the proposed transition strategy can significantly reduce current and torque fluctuations in the transition zone, achieve a smooth transition and better dynamic response characteristics.