Research On Servo Driver Of AC Permanent Magnet Synchronous Motor

Nearly three decades, along with the rapid development of supporting technologysuch as microelectronics, power electronics, sensor technology, motor manufacturingtechnology and advanced control theory, AC servo system whose main control object ispermanent magnet synchronous motor (PMSM) has taken the place of DC servo systemgradually. And it has been applied widely in industrial robots, CNC machine tools, andflexible manufacturing systems, packaging machinery, large scale integrated circuitmanufacturing, radar and other military weapons servo systems and aerospace industry.AC servo system is a complex nonlinear multi-coupled control system coveredMechanics, electronics, electromechanics and other major disciplines, and related to thecontrol of strong and weak electric. Research and development high-performance ACservo system has been one of the key technologies in modern machinery manufacturingindustry and military industries. Improving the capabilities of controller can greatlyimprove the performance of AC servo system. Currently, varieties of advanced controlstrategies and algorithms constantly emerged, and using these in AC servo system willimprove effectively the control performance of AC servo system.To provide the basis for the design of servo control system, mathematical models ofPMSM in the ABC and d-p coordinate system were established respectively in this paperfirstly. A simulation model of AC servo system based on space vector pulse widthmodulation (SVPWM) with the Matlab/Simulink software was created. To prove thevalidity of the model, PID control policy with the model was debugged and simulated.Because there are all kinds of disturbances in the operation process of permanentmagnet servo system, the theory of disturbance observer (DOB) was introduced to the ACservo system. Grounded on PID controller in AC servo system,DOB was applied inposition loop to improve Anti-interference ability of control system. Simulation resultsshowed that, after the DOB was joined in system, anti-disturbance ability and trackingaccuracy were enhanced.According to the control experience, a fuzzy adaptive PID controller was designedto timely regulate PID parameters to get satisfactory control effect. It combines with thecharacteristics of fuzzy control and adaptive control policy that they endow with betterrobustness, simple and practical design method, and do not require the system accuratemodel. The simulation represented that the controller can greatly improve trackingperformance and stability, for it can accurately reflect the error change and cancompensate for faults of fuzzy control when the errors became smaller and smaller.Finally, the basic situation of the permanent magnet AC servo driver was explored. Major works were discussed the calculation and design of the power driver circuit. Theseworks were ready for establishment of PMSM experimental platform.