Design And Implementation Of Sensorless BLDC Motor Control System Based On DSP

The Brushless DC motor(BLDCM) plays an important role in multifarious electric drive and position servo system due to its good characteristics of speed control,simple configuration,high efficiency and retained the DC motor excellent lnechanical properties.With the rapid development of modern industry,the requirement of the BLDCM performance is continuously increase.Because of the advantages of small size,interference immunity ability,Sensorless Brushless DC motor (Sensorless BLDCM) got a widely application.Therefore their control technologies become a hot spot of research in recent years.Based on achievements in scientific research about Sensorless BLDCM at home and abroad,this paper investigate the intelligent control system apply to Sensorless BLDCM which use digital signal processor(DSP) to control.The system focuses on Back-EMF rotor location detect method and double closed-loop double control strategy which are realized in the DSPThe main contents of the paper include the following aspects:Firstly,this paper introduces the academic background and current research situation on Sensorless BLDCM.According to the mathematical model,a Sensorless BLDCM system simulation platform was built using MATLAB / Simulink tools.This platform provides a reliable conclusion for the new control methods which used to control BLDCM.Secondly,because of the Sensorless BLDCM abolished the position sensor,so detecting the rotor position of Sensorless BLDCM becomes one of the key technologies of the motor control system.The paper explains the details of various Sensorless BLDCM rotor position detecting methods and their advantages and disadvantages,then gives the explanation and analysis of how to use the high-speed DSP processing capacity to complete Back-EMF rotor position detect.Thirdly,in order to enhance the performance of the Sensorless BLDCM speed control system,Fuzzy control and PID control are used to setup double closed-loop double strategy motor control system.The motor simulation shows that the strategy of Sensorless BLDCM control system is effectiveness and superiority.Finally,the hardware system is designed using TMS320LF2407A processor which is TI's production as the core.Under the hardware platform use C Programming language combined with assembly language to complete the control strategy coding.The results of the system test prove the effectiveness of the design.