介绍起重冶金电机S4工作制，不同负载持续率及不同起动次数时，确定其输出功率的试验方法。

This paper introduces duty type S4 of motor for crane and metallurgical applications and the test method to determine outputs of the motor at varied cyclic duration factor and starting times.

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高起动转矩圆柱转子电机，防护等级IP54，负载持续率及接电次数均能满足用户使用要求。

Cylindrical rotor motor with high starting moment is applied and its protection standard meets IP54 Specifications. The duty cycles and power frequencies are available for various USES of the hoist.

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