Study on the Sensorless Control System of Brushless DC Motor
|School||Harbin University of Science and Technology|
|Course||Power Electronics and Power Drives|
|Keywords||Brushless DC Motor EMF Detection Phase shift compensation Matlab simulation|
The brushless DC motor Mechatronics Motor With advances in power electronics technology and the emergence of new permanent magnetic materials and the rapid development of a new type . With the brushless DC motors widely used in various fields , the advantage of the position sensor detection method has become increasingly evident . First, starting from the structure and working principle of a brushless DC motor , analysis summarizes the research status of the home and abroad sensorless brushless DC motor control technology . Around the key issues sensorless brushless DC motor control , by software , hardware and indirect access to reliable rotor position information , in-depth study of sensorless brushless DC motor control system . Brushless DC motivation while in-depth study of the \Second , the application Matlab7.1/Simulink brushless DC motor position sensor control system simulation , the system uses a double closed-loop control of speed, current speed loop and current loop PI regulator , the simulation results show that , this article design sensorless brushless DC motor system good static and dynamic characteristics , and thus provide a strong basis for the control scheme proposed in this paper . Designed the first-order RC low-pass filter , and back-EMF phase discriminator circuit and drive circuit , as well as other hardware circuit design , to build DSP main chip position sensor control system hardware experimental platform , and written in assembly language sensorless brushless DC motor control system software program . At the same time , the use of the \Finally , set up a sensorless brushless DC motor control system test platform , the entire motor control system related experiments , experimental results are given , and experimental analysis . The experiments show that the proposed and developed brushless DC motor without position sensor control system performance .