The Position Control Based On Fuzzy Adaptive Setting PID For Linear Switch Reluctance Motor

In modern industrial production, straight line operation is needed in most advanced production process. In order to achieve linear motion, traditionally, the rotation movement of rotary motor could be converted into linear motion by transmission device.While, linear motor such as the linear switched reluctance motor(LSRM) is suitable for the linear motion with high frequency-reciprocating, as well as the position control system with requirement for high control accuracy. The motor has not been widely used for the reason that the mathematic model of LSRM is difficult to establish accurately with a torque ripple, therefore it is difficult to control the LSRM. While with the development of power electronic technology,switched reluctance motor with simple structure, perfect performance, has attracted universal attention by academic circles, more and more colleges and universities and research institutions began to research in recent years.In this paper, the control strategy of LSRM position control system is researched combining with the development of advanced control technology. This paper analyzes the basic structure and working principle of LSRM.Basic equation LSRM was deduced. The establishment of the mathematical model for LSRM is difficult to accurately with strong nonlinear characteristics.The author of this paper, design the system identification adaptive controller and fuzzy adaptive setting PID controller for LSRM position control system. LSRM position control system is discrete second order system,approximately. This paper adopts the method of system identification to estimate the discrete second order system parameters, then using pole assignment adaptive control. Fuzzy adaptive setting PID controller does not rely on the mathematical model of the object. The fuzzy setting adaptive setting PID controller is designed in the LSRM position control,with real-time adjustment of PID controller parameters to adapt to the change of the controlled object. dSPACE motion controlplatform in the paper, several control algorithm is realized. In the experiment,reference input signal square-wave signal is set with a amplitude of 20 mm, and frequency of 0.5 Hz.The results of experiment show that the fuzzy adaptive setting PID controller is obtained control accuracy within ±3 ?m. Furtherly, spring with 100 N/m of the stiffness coefficient as the load, the results of experiment show that the fuzzy adaptive setting PID with a strong ability to resist disturbance of the spring load.