Research On The Control Of PMSM Based On Direct Torque And Sensorless

Direct torque control(DTC)of permanent magnet synchronous motor(PMSM)is used in both industrial and agricultural production and aeronautics and astronautics,with excellent dynamic performance.Based on the direct torque control system,in order to ensure excellent torque dynamic performance of PMSM as the premise and improve the servo performance of PMSM as the target,this paper study the related problems of PMSM-DTC,and optimization of the sensorless control,and the main research contents are as follows:Firstly,based on the PMSM model predictive torque control,this paper design of a new type of nonsingular fast terminal sliding mode speed regulator,to increase the robustness of the system.Furthermore,in order to reduce the torque ripple,this paper introduces the zero vectors to the torque control model and adds the delay compensation.Meanwhile through the establishment of the Simulink simulation,compared with the same parameters of PMSM with SVPWM-DTC,verify the feasibility of the proposed control system and its performance.Then,in order to solve the problem that the weight coefficient of evaluation function based on PMSM-MPTC cannot be determined;this paper derives the result through formula.Compared with the traditional evaluation function and determine the weight coefficient of experience,the simulation results verify the effectiveness and the feasibility of the evaluation function of weight coefficients.Besides,the traditional speed observer with model reference adaptive system(MRAS)was improved with nonsingular fast terminal sliding mode(NFTSM)technology.In this paper,a NFTSM-MRAS observer model is designed,which is combined with the model predictive torque control system.The simulation results show that the sensorless control system compared with the traditional speed estimation precision,the speed error and the rotor position are significantly improved.Finally,to let the TMS320F28335 DSP as the core processor,the software loop designed by C language,verify the model in prediction of torque control.Meanwhile,the DSP is added to the control system also called the hardware loop with real-time simulation,the experimental results verify the feasibility and effectiveness of the system.