关键词: 永磁同步电机, 增益误差, 偏移误差, 低通滤波器

Abstract:

The stator measurement accuracy of permanent magnet synchronous motor is a vital part to ensure that high performance motor control system.Stator current measurement will inevitably bring in scaling error and offset error, while current error will cause motor speed and torque ripple. The causes of the two errors and the influence on the closed-loop control system were analyzed and putting forward a kind of compensation algorithmwhich combine low-pass filterwithspeed error for error current compensation algorithm.Simulation and experimental results show that the offset error and scaling errorintroduced during the stator current measurement will periodically pulsate the motor speed and torque at f_e and 2f_e.The compensation algorithm proposed could effectively eliminate the harmonic components of the measured sub-current, suppress the speed and torque ripple caused by the current measurement error of the motor, and improve the steady state and dynamic performance of the permanent magnet synchronous motor speed control system.

Key words: permanent magnet synchronous motor, scaling error, offset error, low-pass filter