说明：  电动机直接转矩控制模型，采用直接转矩控制方法控制逆变器，设有速度输入接口，可调节速度的大小，可运行于牵引工况和再生制动工况。
(The direct torque control model of the motor. The direct torque control method is used to control the inverter, with speed input interface and adjustable speed. It can run in traction and regenerative braking.)