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在工农业生产中,包括商办厂和企业,三相异步电动机的应用非常广泛,据估计它的安装台数占总安装台数的80％以上。由于三相异步电动机安装台数多,而且多数为中小型的,使用环境和维护条件比较差,它的故障在各种电动机故障中占第一位。三相异步电动机的故障有机械的、电气的等多种,其中最常见的是断相故障。所谓断相,就是电动机的三相供电电源中有一相断开、或电动机的三相绕组中有一相断开。据国内不完全的统计,在电动机损坏的总台数中,至少有50％是由于断相造成的,生产管理不善的
In industrial and agricultural production, including commercial plants and enterprises, the application of three-phase asynchronous motors is very extensive. It is estimated that the number of installed stations accounts for more than 80% of the total number of installed stations. Due to the large number of three-phase asynchronous motors installed, and the majority of them are small and medium-sized, the operating environment and maintenance conditions are relatively poor, and its failures account for the first place among various motor failures. Three-phase asynchronous motor failures are mechanical, electrical, and many other, the most common of which is phase failure. The so-called phase failure means that one phase of the three-phase power supply of the motor is disconnected, or that one phase of the three-phase winding of the motor is disconnected. According to incomplete domestic statistics, at least 50% of the total number of damaged motors is due to phase failure and poor production management.