西门子产品6SE6440-2UD33-0EA1

6SE6440-2UD33-0EA1

6SE6440-2UD33-0EA1

万用表是一种常用的电测仪器，可以用于测量电路中的电压、电流、电阻等参数。下面是使用万用表测量三相电机好坏的步骤：

　　确认电机电源是否关闭，并断开电源。

　　测量电机的电阻：将万用表调至电阻档位，接上电机的三个绕组，分别测量三个绕组的电阻值。如果电阻值不相等，或者电阻值异常，可能表明电机有故障。

　　测量电机的电压：将万用表调至交流电压档位，将表笔分别接在电机的三个相线上，再接上电源，测量电机的电压值。如果三个相线的电压值不相等，或者电压值异常，可能表明电机有故障。

　　测量电机的电流：将万用表调至交流电流档位，将表笔分别接在电机的三个相线上，再接上电源，测量电机的电流值。如果三个相线的电流值不相等，或者电流值异常，可能表明电机有故障。

　　检查电机的转向：将万用表调至直流电压档位，将表笔分别接在电机的两个相线上，再接上电源，观察电机的旋转方向是否正确。如果电机转向不正确，可能表明电机有故障。

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