电动起重机械的驱动电动机要根据所需功率、最大转矩、接电持续率、起动等级、控制类型、速度变化范围、供电方式、保护等级、环境温度与使用地区海拔高度等因素进行选择。本文重点介绍起重机的起升、运行和回转三个主要机构确定所需功率、最大转矩和平均等效转矩的方法。 Electric hoist motor drive motor to be based on the required power, maximum torque, power continued rate, start level, type of control, speed range, power supply, protection level, ambient temperature and the use of altitude and other factors to choose. This article focuses on the crane’s lifting, running and turning the three main agencies to determine the required power, maximum torque and average equivalent torque method.