Intelligent Control Of Valve Based On Switched Reluctance Motor

With the development of the industry, intelligent valve actuator has gained more and more popularity in the fields of chemical engineering,metallurgy and electric power. So it is significant to develop intelligent and digital valve control system which is suitable for production requirement.Because of its simple structure, flexible control, high reliability, good braking performance, sturdy and durable characteristic, switched reluctance motor which can efficiently operate in the quite wide range of speed, is suitable to be the actuator of the valve opening degree control system.This paper mainly studies the application of position servo system which is based on 4-phase 8/6 poles switched reluctance motor in the field of valve opening degree control system. At the same time, append host computer control function, remote control function, human-computer interaction function to this system, design controller hardware circuit which has two AVR MCU as its core.Firstly, according to the structure and working principle of SRM, establish its mathematical model, analyze and confirm the position signal detective method of SRM. Make the opening degree strategy for this system: use closed loop control which includes position loop, speed loop, current loop, accommodate the phase voltage though T/C2's PWM chopper output, then regulate current indirectly to control the speed. At the same time, use SRM's excellent braking performance, turn the veracious track of desire position into reality.Secondly, take two AVR MCU as its core, make full use of its hardware resource, design the hardware circuit of controller, use C to design modularization software program on the base of hardware. Use VB to compile host computer communication software.Finally, make the system debugging, the speed curve gained from experiment proves the feasibility of this control system.