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电机电流与电源电流

我用drv 8301 rev d 驱动无刷电机,请问电机电流和电源输入部分的电流是不是相等?它们之间应该是什么关系呢?如果我的电源输入部分电流只有2A,是不是不能驱动8A的无刷电机输出额定扭矩?这两个电流之间有什么联系?谢谢!