摘  要：基于Matlab/Simulink构建了无位置传感器无刷直流电机双闭环调速系统的仿真模型。在模型中，通过建立 PWM的Matlab函数，可方便实现不同PWM调制模式对调速系统的控制。仿真结果表明，模型动态响应快，极易对比观察出不同PWM调制模式下转速、相电流、转距波形的变化情况，有助于为实际电机调速系统选择最佳的PWM调制模式。

Abstract:Peritoneal dialysis .is an important approach to the treatmen to frenal failure diseases.In this paper a system basing on TMS320LF2407A DSP and photoelectric sensor for controlling the valves of intelligent peritoneal dialysis instrument developed by authors is proposed.The system is used to control infuseing medication and letting waste of the dialysis.The system includes DSP controller, infrared sensor,stepping motor and its driver,code switch for controlling velocity of flow, peremptorily stopping button and so on.By the signal from the CPU,EV of the DSP uniting the code switch and the infrared sensor controls the stepping motor to open or close the valve.