基于高频位置矫正法的永磁同步电机低速域抗扰动插值控制策略

High-Frequency-Position-Correction-Based Anti-Interference Interpolation Control Strategy of Permanent Magnet Synchronous Machine at Low Speed

在低精度编码器、低速域的永磁同步电机驱动系统中,位置插值算法可有效提高转子位置精度。当系统受到持续扰动时,插值位置会出现较大偏差,严重时会导致电机反转。为提高插值算法的抗扰动能力和驱动系统的稳定性,提出一种基于高频位置矫正的改进插值算法。通过短暂注入高频信号,电机高频模型精确地获得转子位置瞬时值,确保驱动系统在持续扰动下运行的稳定性。实验结果表明,该方法能够在持续扰动下得到准确的转子位置,进而提高插值算法的抗扰动性能。

In the driving system of permanent magnet synchronous machine(PMSM)with low-precision encoder and low-speed,the position interpolation algorithm can effectively improve the accuracy of rotor position.When the system is continuously disturbed,the interpolation position has a large deviation,and in severe cases,it will even cause the motor to reverse.In order to improve the anti-interference performance of the interpolation algorithm and the stability of the drive system,an improved interpolation algorithm based on high-frequency-position-correction was proposed,which accurately obtained the instantaneous value of the rotor position from the high-frequency model of the motor by short-term injection of high-frequency signals which ensured the stability of the drive system under continuous external disturbance.The experimental results show that the proposed method can obtain the precise rotor position under continuous disturbance and improve the anti-interference performance of the interpolation control algorithm.