Abstract：Compared with the sensorless control of PMSM with high-frequency injection, the IF control has the advantages of simple implementation, wide adaptation to motor, and no additional vibration and noise. However, the traditional IF control is only used as the low-speed starting strategy of PMSM and will not participate in the motor speed regulation process after starting. As a result, the permanent magnet motor started by traditional IF control can not realize full range speed regulation, limiting its popularization and application. Therefore, this paper proposes a full-speed domain sensorless control strategy based on improved IF control and effective flux method, which realizes the smooth switching between IF control and effective flux method under forward and reverse, and entry and exit conditions. By setting the given current as the torque reserve in the $\hat{d}$-axis (virtual d-axis), the problem of the zero-speed ride-through of the permanent magnet motor is solved. During the acceleration and deceleration of the motor, a speed transition zone based on hysteresis switching is set. When the motor is running in the transition zone, the effective flux linkage method is applied to realize closed-loop control, and the current reserve is made on the $\hat{d}$-axis to prepare for entering the IF control zone at any time. The proposed control strategy can realize the stable and smooth operation of the permanent magnet synchronous motor in full speed domain. The speed regulation effect in the full speed domain is similar to that of the high-frequency injection method. Finally, the effectiveness of the proposed method is verified by experiments on a three-phase permanent magnet synchronous motor drive platform.
付康壮, 刘计龙, 麦志勤, 牧雅璐, 李科峰. 改进型IF控制结合有效磁链法的永磁同步电机全速域无位置传感器控制策略[J]. 电工技术学报, 2022, 37(22): 5704-5716.
Fu Kangzhuang, Liu Jilong, Mai Zhiqin, Mu Yalu, Li Kefeng. A Full-Speed Domain Sensorless Control Strategy for Permanent Magnet Synchronous Motor Based on Improved IF Control and Effective Flux Method. Transactions of China Electrotechnical Society, 2022, 37(22): 5704-5716.
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