Research On Permanent Magnet Synchronous Motor Dynamic Decoupling Control

Permanent magnet synchronous motor(PMSM) has the advantages of small volume,high power quality, efficiency and high power factor, easy maintenance and other characteristics, widely used in aerospace, servo control, robot, electric vehicle. Therefore,study on the control system of permanent magnet synchronous motor has attracted more and more attention. How to effectively control of PMSM has a positive impact on promoting social progress of science and technology, production efficiency, energy saving and emission reduction. Although vector control realize decoupling of the torque component of stator current and the excitation component, but in actual control system, the coupling effect between the motor d, q axis current, which will lead to a decrease in the stability of the system.Therefore, PMSM as the research object, around the permanent magnetic motor decoupling control system the following work has been done:(1) This paper first introduces the physical model of permanent magnet synchronous motor, and establishes the mathematical model of permanent magnet synchronous motor dq axis coordinate system through coordinate transformation, introduces the principle of vector control of permanent magnet synchronous motor.(2) The coupling effect on permanent magnet motor mathematical model are analyzed and studied several common dynamic decoupling strategy, Current feedback decoupling control through the feedback current coupled offset voltage model is simple in structure,conducive to the realization of the motor parameters vary, but poor robustness. In this paper,through the derivation of internal model decoupling device, design parameters for the adaptive internal model decoupling control system, can improve the internal control system robustness and immunity.(3) To deduce the maximum torque per ampere(MTPA) of PMSM control strategy.According to the function of the complicated relations between the stator current vector and the stator current optimum angle of curve fitting using least square method, the approximate solution.(4) On the basis of theoretical analysis, the PMSM control system of different decoupling controller based on MATLAB/Simulink simulation platform. In the parameter accuracy and error conditions, comparison of different motor state decoupling control system response. The simulation results show that parameter adaptive internal model system has good dynamic stability.