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三相异步电动机是起重机械上使用最为广泛的电动机。作为起重机械的驱动部件,起重机械大部分电气保护与电动机保护有关。根据起重机械相关标准和安全技术规范,电动机保护有关的电气保护主要有过热保护、过载(过流)保护、短路保护、超速保护、断错相保护、欠(过)电压保护、正反相接触器故障保护等,其本质都属于防止电动机出现故障或异常的保护。
Three-phase asynchronous motors are the most widely used motors for hoisting machinery. As the driving component of lifting appliances, most of the electrical protection of lifting appliances is related to motor protection. According to the relevant standards of hoisting machinery and safety technical specifications, the electric protection related to motor protection mainly includes overheat protection, overload (overcurrent) protection, short circuit protection, overspeed protection, fault protection phase protection, under (over)voltage protection, and positive inversion Contactor fault protection, etc., is essentially the protection against malfunction or abnormality of the motor.