关键词: 电流采样, 通道串扰, 永磁同步电机, 参数匹配

Abstract: Permanent magnet synchronous motors need to collect the actual current values and achieve current closedloop control through Clarke transform and Park transform,the accuracy of current sampling value is particularly important. When multi-channel ADC shares the sample and hold circuit for sampling, the channel crosstalk problem may occur, affecting the current sampling value, and then affecting the motor control effect. The introduces the multi-channel ADC sampling principle of PMSM controller, studies the influence of current sampling channel crosstalk on PMSM control, compares and analyzes the influence of different sampling frequency and holding period on current value,and finally selects the appropriate sampling parameters to reduce the influence of crosstalk of current sampling channel and improve the control stability of motor under low speed and small torque conditions.

Key words: current sampling,channel crosstalk,permanent magnet synchronous motors,parameter matching