三相异步电动机的晶闸管软启动方法及设计

The Srart Method and Dsingn of 3-Phase Motor via the Thyristor

论述了利用移相晶闸管导通角变化三相异步电动机降压启动的固态启动器原理及设计。这种无触点软启动方式结构简单，性能好，调整容易，对于要求不高的风机、泵类负载非常适用。

The authors discuss the theory and design of the solid state starer of the 3-phase induction motor via controlling the trigger angle of the thyristor by phase shift to complete the step down start-up in this article. Comparing with the similar products, this system has the simple composition,excellent performance. high safety and is easy to be adjusted by using the soft start-up without contact. This system can be some value to the energy saving of the driver motors in the use of exhaust fans. pumps and so on.