Permanent Magnet Synchronous Linear Motors Control System Based On Adaptive Observer

Permanent magnet synchronous linear motors (PMLSM) have wide range ofapplications in high-speed, high-precision equipment or systems. Relative to therotation motors, their control required more precisely. Therefore, an effective andreliable control method is necessary. In permanent magnet linear synchronous motorcontrol system, if the motor speed using mechanical sensors, it not only increases theinertia of the motor shaft, the motor size and cost, but also reduces the stability of thesystem. Thus, the sensorless control technology becomes attractive.In the several speed estimated methods of linear motor promoter, the adaptiveobserver method is a widely used method. The MRAS model includes a referencemodel and a adjustable contained identification parameters. It’s parameter identificationis based on the stability of the system, and this method ensures the asymptoticconvergence of the parameter estimates. Also, it has a good dynamic performance. Itsspeed adaptive law is derived by Popov ultra-stability theory stability theory.The control system using space vector control method. In this paper, themathematical model of the linear motor is derivated.And the implementation process ofvector control on permanent magnet synchronous linear motor is analyzed particularly.We also give the modules of control system in Matlab/Simulink. Based the simulationmodel, we compare the performance of counter EMF method and velocity estimationusing MRAS method. Through the results, we can verify the reliability of the speedsensorless control method.The core chip of the control system is TMS320F-2812of TI Company. TheSoftware development using DSP development environment CCS (Code ComposerStudio). In this paper, programs include SVPWM, PI regulator and drivers ofPhase-Shift FB ZVS DC-DC Convertor.