Research And Application Of Permanent Magnet Synchronous Motor Control Algorithm Based On DSP

With the development of power electronic technology,microelectronics technology and permanent magnet materials,the permanent magnet synchronous motor is widely applied to much kinds of fields.With the improvement of the fast tracking performance requirements of the precision instrument for the position,speed and torque of the motor system,the traditional PI controller is difficult to meet these high performance servo requirements.In the light of the strongly coupled and seriously nonlinear properties of three-phase AC permanent magnet motor,in the current paper,the bounded output strategy and sliding mode variable structure control strategy based on Lyapunov function are studied and improved.Then,the above control algorithms are applied to the controller design process of three-phase permanent magnet synchronous motor speed loop.Moreover,the simulation and experiment are presented to illustrate the efficiency of the proposed result.The main work is as follows:1)The research background and significance about the three-phase AC permanent magnet synchronous motor were introduced simply and clearly.And the current situation at home and abroad of the synchronous motor control algorithm of three-phase permanent magnet was analyzed.Moreover,the characteristics and problems of the several commonly used algorithms were discussed.2)Two schemes about direct torque control and vector control were introduced.The vector control scheme based on id*=0 and SVPWM control technology are applied to build the three-phase AC permanent magnet synchronous motor model.3)Drawing lessons from the Brunovsky thought with state constraints and the research results of barrier Lyapunov control function,the output bounded theory of two order feedback nonlinear systems was applied to the two order mathematical model of motor system.According to the error switching condition and combining sliding mode variable structure control algorithm,the control law is designed.4)According to the continuous control law and the two order mathematical model of the motor,the sampling frequency is set up,and the system controller was designed based on the discrete Lyapunov control function and the sliding mode variable structure control strategy.Then,the simulation experiment was carried out to analyze the tracking performance,dynamic error variation and disturbance rejection of the motor control system.The simulation results show that the proposed method has better response performance and better overshoot than the PI control strategy.5)In the CCS5 development environment,with the use of DSP digital TMS28035 control chip,IPM intelligent control switch and its peripheral driving circuit,the three-phase permanent magnet synchronous motor control law was verified by experiments.Then,the results and data of experiments were analyzed in this paper.6)Through the analysis of experimental data,the experimental error was in a reasonable range.Thus,the feasibility of the control strategy based on discrete disturbance and the sliding mode variable structure is proved.In addition,the further research on the design of current loop controller was presented.7)Based on the results of barrier Lyapunov control function and sliding mode variable structure control strategy,this paper made two improvements:according to the continuous system obstacle Lyapunov control function and sliding mode variable structure control strategy,designing the of the controller of the discrete system barrier Lyapunov control function and sliding mode variable structure control strategy and doing the computer simulation;the controller which based on barrier Lyapunov control function and sliding mode variable structure control strategy was made into the practical application of control for permanent magnet synchronous motor.