说明：  转速开环恒压频比控制的交流异步电机调速系统仿真，给出电机三相电压瞬时值、三相电流瞬时值、电磁转矩、转速等随时间变化的结果。研究生作业，调试通过。
(Speed open-loop constant voltage frequency ratio control of ac induction motor speed control system simulation, motor three-phase voltage instantaneous value is given, and three phase current instantaneous value, the electromagnetic torque, speed, etc. The result of the change over time. Graduate students homework, debugging through.)