所研究的软起动器具备四种起动方式：电压斜坡起动、限流起动、转速斜坡起动和分级变频起动。

It has four start mode: the ramp voltage start, the limit current start, the ramp speed start and the discrete frequency start.

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常用的异步电机软起动器采用线性斜坡降压的方式进行泵类负载的软停控制时，容易引起泵系统软停时的喘振现象。

The pump system using asynchronous motor and soft starter is subjected easily to surges when soft stopping control method is used with linear voltage falling.

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利用MATLAB搭建了高压异步电动机软起动控制的仿真模型，对限流和电压斜坡软起动控制方式分别进行仿真。

The simulation model of high voltage induction motors soft starting control is created by MATLAB. The soft starting control model of the current-limit start and the voltage-slope start are simulated.

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