介绍了桥式起重机提升电动机在试车过程中出现的一个异常现象，并分析其试验过程，找出故障原因及解决办法。

An abnormal phenomenon during trial run of the bridge crane motor is introduced, the test procedure is analyzed, and the cause of fault and the solution have been found.

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绞车，起货机一种装有卷筒的固定的电动机驱动或手动的吊升机械，卷筒周围缠绕着与提升的重物相连的绳索。

A stationary motor-driven or hand-powered hoisting machine having a drum around which is wound a rope or chain attached to the load being lifted.

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首先对有对重的提升系统进行了力学分析，得出了加速阶段由于惯性的作用电动机必须提供的附加力矩。

Based on mechanics analysis of elevating system with balancing weight, the additional driving moment that the motor have to supply for accelerating a inertia load is obtained.

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