请问一下我做永磁机无速度控制时，程序中估计的速度经过低通滤波之后就始终跟不上面板给定的速度，例如给定400rpm，电机只能转到300rpm,而且转速上升得明显慢了。但是程序中改为编码器测的实际速度时就跟得上。请指教谢谢！
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