电动机合闸后如不能起动，从故障现象来看，可以归纳为以下四种类型。故障不同，产生的原因和采取的措施也就各异。(1)合闸后电动机无任何动静。①电源不通。三相电机只要有两根线不通，单相电机只要有一根线不通，就会造成这类故障。因此，首先应检查电源是否断电，开关、保险 If the motor can not start after closing, from the point of view of the fault, can be summarized into the following four types. Different failures, the causes and the measures taken will be different. (1) motor without any movement after closing. ① power nowhere As long as three-phase three-phase motor barrier, single-phase motor as long as there is a line barrier, it will cause such failures. Therefore, first check whether the power is off, switch, insurance