Study On The Permanent Magnet Synchronous Motor Backstepping Control Strategy And System Implement

Permanent magnet synchronous motor (PMSM) is a nonlinear ,structurevarying and multiple states object. The precise position control of PMSMis a more complicated problem due to the multi-input multi-output natureof the motor and the significant nonlinear coupling among its phase windingcurrents and the rotor velocity. In order to satisfy the high performancedemand, the backstepping method is proved almost the best by theory andsimulation among the developed and being studied nonlinear control method.Different with the traditional designs, some high performance servosystems of PMSM based on its nonlinear nature are developed. Firstly, thePMSM precision mathematical models are established based on the dqreference coordinates by strict analysis and calculation. The PMSM vectorcontrol system is studied by simulation to verify the validity of the PMSMmodel built. Secondly, the backstepping method is used to design a fullstate feedback controller assuming that all states of system can be measured.An adaptive backstepping controller is proposed to deal with variedparameters. Then under the conditions that only the position of the rotorcan be measured, the velocity and stator currents observer are designed,therefore an output feedback controller based on backstepping technologyis proposed. Simulations of the systems designed above are carried out tovalidate the performances. Lastly, based on dSPACE, the PMSM systemreal-time experimental platform has been established to testify thebackstepping control systems, which are studied as examples. The experimentresults show that the systems adopted the backstepping nonlinear controllercan achieve high precision servo performance.