说明：  直流PWM-M 可逆调速系统的仿真模模型在直流PWM-M系统主电路模型基础上增加了转速调节器ASR 和电流调节器ACR ，ASR 和ACR 都采用带输出限幅的PI 调节器。
(Reversible DC PWM-M model simulation mode speed control system in the main circuit of the base model DC PWM-M system adds speed regulator ASR and current regulator ACR, ASR and ACR are used with output limiter PI regulator.)