中文说明：文件中用matlab建立了关于异步电机的调速仿真模型，包括变频调速，矢量控制，串电阻调速，调压调速模型。
English Description：
In the document, Matlab is used to establish the speed control simulation model of asynchronous motor, including frequency conversion speed regulation, vector control, series resistance speed regulation and voltage regulation speed regulation model.