Study And Implementation Of Intelligent Control Technology Based On AC Position Servo System

In the ocean engineering design and scientific research, due to the more complicated environment and influence factors in nature, people need to simulate sea wave in a laboratory setting to accurately recreate the wave motion in order to facilitate experimental design. Wave machine is such a experimental facility to simulate sea wave. Most of the wave machine products made at home and abroad are based on hydraulically driving arrangements, which exist big flaws in respect of stability and accuracy. With the development of motion control technology and performance enhancement of servo system, more and more researchers put focus on research and development of the wave machine based on AC position servo system.As an important part of wave machine, the performance of the position servo system affects the accuracy, speed and reliability of the whole machine. Most of the position servo systems of wave machines work in open loop states, their feedback control of motors are only achieved by current loops and speed loops. So the motor encoder signal can be brought in motion controller to form a closed position loop, in which the advanced control algorithm can be used to improve the tracking accuracy of wave machine.This paper summarizes the components, characteristics and development tendency of AC servo position system, carries research on intelligent control algorithm aiming at the improvment of position control system's tracking accuracy. The paper takes the self-made motion control card and a Panasonic AC servo system as the motion controller and the controlled plant respectively. Analyses the structure of the motion control card and uses Windriver to develop PCI device driver in Windows XP operate system. Introduces the working principle of the motion control card and completes its feedback detection function. Get the simplified model of the object by neglecting the influence of the motor machinery inertia and electromagnetic inertia and simplifying the motor driver as a proportional element. Studies PID and Fuzzy parameter self-tuning PID control algorithms, which are simulated with MATLAB software, the simulation results show that the control effect with fuzzy PID is better than it with normal PID algorithm. Implements fuzzy PID with the FPGA chip in the motion control card by modular design method.The fuzzy PID controller consists of a fuzzy input module,a fuzzy control module and a PID module,offline look-up table is used to design the fuzzy control module to save FPGA resources and improve the computing rate.Simulates each module within the development environment of QuartusⅡ6.0,proving that its logic function and timing sequence comply with the design requirements. Adds forward error compensation according to the experimental test. The experiments shows that the fuzzy PID plus forward error compensation algorithm is validated, which improved the tracking accuracy of the half-closed loop position servo system.