电源缺相,熔断器熔断,开关或接触器接触不良,或者电动机内部断线等,都会使电动机缺相运行而烧坏电机。对于反复短时工作制的起重机械,当电动机缺相运行时,不会造成严重后果,再次起动时便易于发现,所以我国有关起重机设计规范没有阐述这个问题,这对于阻力负载的平移机构无疑是如此。但对于具 Power phase loss, fuse blown, switch or contactor poor contact, or motor internal disconnection, etc., will run the motor phase loss and burn the motor. For repeated short-time working system of lifting machinery, when the motor phase-out operation, will not cause serious consequences, it is easy to find again when starting, so our country crane design code does not elaborate on this issue, which is undoubtedly the translational load resistance mechanism That’s it. But for a