Research On The Start-Up Method Of Sensorless Brushless DC Motor

Brushless DC motor due to its advantages such as high efficiency, low power consumption, small size, light weight, now is widely used in various fields. Brushless DC motor without position sensor due to overcoming the disadvantages arising from the installation of the position sensor, improved system reliability and broaden its applications.Sensorless brushless DC motor starting technology is always stress and difficulty for scholars at home and abroad. Therefore, it is necessary to study and to design a reliable and practical value of the startup method.First, introduce the background and significance of the study of brushless DC motor,combined with analysis of present research at home and abroad have started widely used several methods of, and the start of Sensorless brushless DC motor research emphases and difficulty;Secondly, we analyze the basic structure and working principle of brushless DC motor,was established on the basis of mathematical model of BLDCM and theory preparation for further modeling and simulation;Again, papers proposed has a based on pulse voltage injected of started method and to out has specific programme, focus research has started process of rotor positioning, and rotor of precise positioning and accelerated and the switch, to solution started Hou of synchronization switch problem, in since synchronization stage used based on line voltage poor value method of anti-potential had zero points detection method, and detailed analysis has applies this programme of PWM modulation way;Finally, through theoretical analysis based on the Maltab/Simulink model for simulation of BLDCM boot method, simulation and experimental verification of the proposed plans are feasible and experimental results showed that the start method effectively solves poor short-pulse method to speed up performance, noise problems, achieve Sensorless commutation of brushless DC motor’s acceleration and stability.