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大多数起重机械选用的电动机工作接电持续率是25%,而我国起重及冶金用YZR系列三相异步电动机的设计是以满足冶金机械的使用要求为主,以S,40%为基准工作制。在起重机设计中,如果按S_325%工作制选用YZR系列电动机,其功率可以满足要求,但是过载能力T_M不能满足起重机设计的要求,势必选大机座型号,引起浪费。以YZR225M-6型电动机为例,该型号电动机在S_340%工作制时
Most of the lifting machinery used in the motor working continuous power rate is 25%, while China’s lifting and metallurgy with YZR series three-phase asynchronous motor design is to meet the requirements of the use of metallurgical machinery based on S, 40% as a benchmark Work system. In the crane design, if the work system according to S_325% YZR series motor selection, the power to meet the requirements, but the overload capacity T_M can not meet the requirements of crane design, is bound to choose a large base model, causing waste. To YZR225M-6-type motor, for example, the model motor S_340% work in the system