(软启动器)是一种集电机软起动、软停车、轻载节能和多种保护功能于一体的新颖电机控制装置
(soft starter) is a new motor control device, which integrates soft start, soft stop, light load, energy saving and multiple protection functions
，国外称为Soft Starter。软启器采用三相反并联晶闸管作为调压器，将其接入电源和电动机定子之间。
It is called Soft Starter abroad. The soft starter adopts the three-phase anti parallel thyristor as the voltage regulator, and connects it between the power supply and the motor stator.
这种电路如三相全控桥式整流电路。使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐
This circuit, such as three-phase full controlled bridge rectifier circuit. When the soft starter is used to start the motor, the output voltage of the thyristor increases gradually
渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上，实现平滑启动，降低启动电流，避免
When the motor works at rated voltage, it can start smoothly, reduce the starting current and avoid the starting current
启动过流跳闸。待电机达到额定转数时，启动过程结束，软启动器自动用旁路接触器取代已完成任务的晶
Starting overcurrent trip. When the motor reaches the rated speed, the start process is finished, and the soft starter automatically replaces the finished crystal with the bypass contactor
