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直流有刷电机运行电流检测

Other Parts Discussed in Thread: AMC1200

请问如何精确的测量直流有刷电机的运行电流,以前通过在电机回路上串联一个小电阻测量,但这样测的电流值一直变化,请问论坛里有没有好的测量方法咧.......