The Research On Servo Control System For AC PMSM Based On DSP

AC permanent magnet synchronous servo drive system is widely used in so many fields such asNC machine, household appliances, robots engineering and aeronautics and astronautics. With thedevelopment of electrical-electronical and micro processer technology, permanent magnetsynchronous digital servo system based on DSP has become the develop trend for the performance inrealizing control strategy of high capability and advanced control arithmetic.In this paper, the actuality and relevant technology of servo were introduced and the futuredirection was prospected. A mathematical model of permanent magnet synchronous electromotorwas established in dq0coordinate system based on which effect factors in low speed were analyzed.The main task of the subject is to design a digital AC servo drive which does well in practice.The control object of the drive is a permanent magnet synchronous electromotor according to thestrategy of vector control. The hardware system contains power system, aptitude power system andDSP port system. Three closed loop of the controller, namely electricity, speed and displacement,were designed. The improvement of PI control in electricity was illustrated by frequency analyzed.In speed loop, a Parameter self-tuning fuzzy-PID control method was proposed. Good performancein speed control removed the conflict between overshoot and celerity, and the adaptability,robustness and stability of the system were improved significantly by the new control drive. Theoperation to realize the SVPWM arithmetic was also introduced.The simulation models of all teaches in the AC permanent magnet synchronous servo drivesystem were constructed in Matlab/Simulink, according to which the feasibility was validated andthe control parameters were defined. Test for the whole system was carried out both in hardware flatbased on the servo drive and software flat based on DSP developing tool and results suggested thatthe drive provides favorable performance in control accuracy and dynamic response which settled animportant technical foundation for the future research.