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电机识别过程中电流波形是很好的正弦波,但是识别完成后电流波形不是正弦波



我用例程proj-lab2b  调试   电机识别过程中电流波形是很好的正弦波,识别完成后电流波形不是正弦波,如下

 

电机已经加载,相电流4A 。  

这是为什么?该怎么解决?