Research on Speed Control of Machine Tool Spindle Driven by Hydraulic Motor Based on PID
The control accuracy of the traditional PID controller is not high because the spindle system of hydraulic motor-driven machine tool has time-varying parameters and higher non-linearity.Aiming at the speed control problem of the hydraulic motor-driven machine tool spindle system,the fuzzy self-tuning PID controller is adopted to realize the effective control of the spindle sys-tem and the control effect is simulated and verified in this paper.The model diagram of spindle system is constructed,and the mathematical model of spindle system is established.For the parameters of traditional PID controller,the fuzzy controller is used for real-time tuning and the fuzzy self-tuning PID controller is developed.Finally,MATLAB is used to simulate the spindle sys-tem.At the same time,the results are compared and analyzed with the traditional PID controller.The simulation results show that the spindle speed overshoot of the fuzzy self-tuning PID controller is smaller,and has faster response time,higher tracking accu-racy.The system energy consumption is reduced by about 20％;even if it is subjected to larger random interference,the fuzzy self-tuning PID controller can quickly eliminate the interference and keep the spindle speed of the machine tool in a controlled state.The dynamic stability and anti-interference ability of the spindle system can be effectively improved by using of the fuzzy self-tun-ing PID controller.
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