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传统的笼型异步电动机的起动分为直接启动和降压启动。一般来说,大容量电机很少采用直接启动,因为这势必要增加供电变压器的容量和线路设备的投资。对于中大容量异步电动机来说,采用降压启动是一种切实可行的方法,如串电阻(或电抗器)启动、星–三角(Y-×)降压启动、自耦变压器降压启动等,但是传统的降压启动方式却有一些难以克服的缺点。该文介绍了异步电机使用软启动器的原因、QB42系列软启动器的基本工作原理和性能特点以及使用要点,并通过实例分析了QB42系列软启动器在南钢2×220 m2烧结改造项目胶带机的应用控制情况。
The traditional cage induction motor start-up is divided into direct start and step-down start. In general, high-capacity motors are rarely used for direct start-ups because of the need to increase the capacity of the supply transformers and the investment in line equipment. For large capacity asynchronous motors, the use of step-down start-up is a viable approach, such as the string resistor (or reactor) start, star delta (Y- ×) step-down start, autotransformer buck start , But the traditional buck start-up methods have some insurmountable shortcomings. This paper introduces the reason of induction motor using soft starter, QB42 series of soft starter basic working principle and performance characteristics and the use of key points, and through an example of the QB42 series soft starter in Nangang 2 × 220 m2 sintering project adhesive tape Machine application control situation.