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下桥臂双电阻采样电流,能否通过U+V+W=0计算第三相电流?

Other Parts Discussed in Thread: DRV8323

看别人的代码,用DRV8323采两个下桥臂电流,然后通过U+V+W=0计算第三相电流,总感觉不对,根据基尔霍夫电流定律,电机三相输入电流之和等于0,但三个下桥臂的电流之和是不为0的,如何理解呢?