Permanent Magnet Synchronous Motor Direct Torque Control System Improvement

Permanent magnet synchronous motor control performance relative to othermotors is more advantageous, it has been applied in the social life of the morecommon, and our country is rich in rare earth resources, so it makes the study ofpermanent magnet synchronous motor control strategy more meaningful. Theapplication of direct torque control in asynchronous motor has been quitesuccessful. However, the application of direct torque control in permanentmagnet synchronous motor is put forward in recent years, as a result, and thisstrategy remains to be improved in order to improve the torque of permanentmagnet synchronous motor control performance. To solve above problems, thistopic selection of permanent magnet synchronous motor direct torque controlsystem to improve the research, paper through the analysis of permanent magnetsynchronous motor direct torque control strategy, in the Matlab/Simulinkplatform to improve the control strategy of simulation analysis.The article through the principle and the control strategy of PMSM DTC isanalyzed, based on the analysis results to improve the research, and in theMatlab/Simulink platform to improve the control strategy and simulationanalysis. This paper firstly gives a brief classification of permanent magnetsynchronous motor; this paper gives a brief introduction of its differentcharacteristics in different coordinate system, and sets up a mathematical modelof PMSM. On this basis, study on direct torque control (DTC) principles andimplementation methods and Matlab/Simulink down; build systems simulationmodels, Through the simulation model to analyze its feasibility anddisadvantages.To improve its shortcomings, through to research the technology andcontrol algorithms on space-vector pulse-width modulation(SVPWM), and builtit in the Matlab/Simulink simulation module, The simulation results show thatthe scheme can effectively reduce the torque and flux ripple. Again on the basisof the use of increased flux observer and stator resistance methods of compensating device for SVM-DTC scheme is improved, and the simulationverification, show the correctness and effectiveness of the improved method.Concludes with a brief introduction of no speed Sensor direct torquecontrol system are studied based on Model Reference Adaptive System(MRAS)speed identification for vector control strategy of principle and method, givenunder the Matlab/Simulink system simulation model and simulation.