Design And Research Of Variable Structure Controller For PMSM

Controllers in every loop of the servo system is the key to the performance of thesystem, so the design of high performance controller usually takes parameter identificationand controller parameters adaptive control and other advanced control method. This papertakes permanent magnet synchronous motor (PMSM) as the control object, usesmathematical modeling and simulation analysis and other methods to design the servocontroller, especially has a research on the parameter identification and adaptive variablestructure control in speed loop.This thesis analyzes the mathematical model of permanent magnet synchronous motor,introduces some common control strategy, after this, based on the current loop and speedloop equivalent principle of PMSM and classical control theory, design the PI controllerfor all loops, in Matlab/Simulnk platform, built servo system simulation model, andaccording to the classical PI controller with PDFF controller simulation analysis, ananalysis of the performance and parameter sensitivity. Carry on a deep study on the designof servo system’s speed loop, use the method based on the motor motion equations toidentify the motor rotational inertia, and thus deduced real-time electromagnetic torque,according to the identified inertia the speed loop controller parameters are updated, theelectromagnetic torque is compensated. Because PDFF controller and PI controller have alot in common, parameters can be inherited, in the Matlab/Simulnk platform carry on thesimulation study, have a deep analysis to PDFF controller feedforward parameters effecton the performance of the servo system, the simulation results prove that the improvedservo system can change its control performance according to condition requirements, thesystem is more robust.