中文说明：
基于Simulink的永磁同步电机的直接转矩控制的调速仿真，里面用S函数自建部分模块，加快了仿真速度。
English Description：
Speed regulation simulation of direct torque control of permanent magnet synchronous motor based on Simulink, which uses s function to build part of the module, to speed up the simulation speed