现象:某学生公寓一电梯通电后电机运转,电梯不动,且保险丝被烧;更换保险丝后电梯仍不动,且保险丝又被烧断。故障分析:显然此故障不属于电路的短路事故。此电梯是由三相异步电动机拖动的,其转轴通过联轴器与减速器的转轴相联,减速器的转轴又带动电 Phenomenon: When a student’s apartment is powered by an elevator, the motor runs, the elevator does not move, and the fuse is burned; the elevator still does not move after the fuse is replaced, and the fuse is blown again. Fault analysis: Obviously this fault does not belong to the circuit short-circuit accident. The elevator is driven by a three-phase asynchronous motor, its shaft is linked with the shaft of the reducer through the coupling, and the shaft of the reducer is driven by electricity.