In this work, a real-time problem of inaccurate rotor zero position information of PMSM caused by faulty encoder is rectified and the smooth operation of vector-controlled PMSM drive is obtained. The rotor zero position information is given by the index signal of the encoder. It should provide one pulse in each mechanical revolution of the rotor, which denotes the zero position of the rotor. Due to unwanted pulse problem in the faulty encoder, index signal provides undesired multiple pulses at zero position, which gives wrong information of rotor position and thus the performance of PMSM degrades. For such situation, an algorithm is proposed to eliminate the faulty unwanted zero position signal of the encoder and give a precise rotor position. To verify the efficacy of the proposed algorithm, it is tested in a PMSM drive with constant torque angle vector control technique. The motor is operated at different speeds in both clockwise and counter-clockwise directions, and the obtained results show the perfect utility of the proposed scheme.

本工作纠正了因编码器故障导致永磁同步电机转子零位信息不准确的实时问题，实现了矢量控制永磁同步电机驱动器的平稳运行。转子零位置信息由编码器的索引信号给出。它应在转子每机械旋转一圈时提供一个脉冲，表示转子的零位置。由于故障编码器中存在不需要的脉冲问题，索引信号在零位置处提供不需要的多个脉冲，这给出了错误的转子位置信息，从而降低了 PMSM 的性能。针对这种情况，提出了一种算法来消除编码器错误的不需要的零位置信号并给出精确的转子位置。为了验证所提出算法的有效性，它在采用恒扭矩角矢量控制技术的 PMSM 驱动器中进行了测试。电机在顺时针和逆时针方向上以不同的速度运行，获得的结果表明了该方案的完美实用性。