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电流波形不一样



我用proj-lab2b例程识别电机后 加载 相最大电流4A

 电机一      2对极3000转 24v电机 电流波形是正弦波如下图

 电机二   4对极3000转24v电机 电流电流波形如下

两台电机运转都很平滑,两台电机的反电势波形都是正弦波(我是两台电机对拖的)。为什么电机二的电流不是正弦波?请老师指点迷津