Initial Rotor Position Estimation for IPMSM Based on High Frequency Rotating Voltage Injection
Yang Jian1, Yang Shuying2, Li Haoyuan2, Zhang Xing2
1. Intelligent Manufacturing Institute Hefei University of Technology Hefei 230009 China; 2. School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China
Abstract：High frequency (HF) signal injection scheme is widely used to estimate the initial rotor position of interior permanent magnet synchronous motors (IPMSM). The accuracy of the estimated rotor position, however, may be degraded by the phase delay caused by pulse width modulation (PWM), digital filters in signal demodulation process and so on. To solve this problem, the main factors contributing to the estimation error are analyzed, and a unified compensation algorithm is proposed. In the compensation algorithm, the phase shift in the positive-sequence HF currents is extracted and used to compensate error in the estimated rotor position, improving the accuracy of estimation. In order to identify the rotor polarity, a method of the variation of saturated inductor based on the current closed loop control is proposed. In the polarity identification process, in order to keep the motor in static state, the current of q-axis is controlled to 0. By applying different d-axis currents, the corresponding inductance values are calculated and compared, and the polarity identification is achieved accordingly. The effectiveness of the proposed error compensation and polarity identification algorithm is confirmed through experiments.
杨健, 杨淑英, 李浩源, 张兴. 基于旋转高频电压注入的永磁同步电机转子初始位置辨识方法[J]. 电工技术学报, 2018, 33(15): 3547-3555.
Yang Jian, Yang Shuying, Li Haoyuan, Zhang Xing. Initial Rotor Position Estimation for IPMSM Based on High Frequency Rotating Voltage Injection. Transactions of China Electrotechnical Society, 2018, 33(15): 3547-3555.
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2018, Vol. 33 
