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电机空载时到了一定速度就开始有噪声（此时电流不稳定），继续提升速度到一定值，噪声又变小了。带载却完全没有问题。 载波就是默认的45K，如果把速度环PI参数调小，会有明显改善，可是响应变慢了，这无法接受，请教下TI的大神们，这该如何解决？
