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Brushless DC motor has a simple structure , high reliability , high efficiency , easy maintenance and speed performance advantages. With microprocessor technology , power electronics , control theory, as well as low cost, high energy product materials development , is widely used in various fields . In this thesis, sensorless brushless DC motor starting methods and starting control conducted in-depth research . First, in the detailed description of the basic structure of brushless DC motor components and working principle , based on the analysis and comparison of a variety of sensor- starting method advantages and disadvantages. Combined with the characteristics of in-depth study of this issue short- pulse rotor positioning starting method detection principle , and make the method has been optimized and improved, and single-phase detection pulse rotor positioning starting method . Secondly, brushless DC motor ( referred BLDCM) mathematical model , based on the Matlab7.4 / Simulink simulation environment , and establish a dynamic process simulation model. Simulation results verify the theoretical pulse detection accuracy of positioning the rotor starting method for sensorless brushless DC motor starting method still provides a theoretical security research . Finally , the application of experimental development board based XC164 , according to single-phase detection pulse rotor positioning control start- law characteristics of the entire starting control for the corresponding software design, and presents experimental program flow , and the experimental data and the results of in-depth analysis through simulation results verify the correctness of the analysis .
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