Based On Emf Zero Detection Of Brushless Dc Motor Control System Design And Research

Brushless DC Motor (Brushless DC Motor ab. BLDCM) is a new type of electrical-mechanical motor with the development of power electronics technology and new permanent magnetic materials. It has the general performance of AC motor and DC motor, so it was widely applied in all kinds of field. But its own existed problem of the torque ripple and accurate detection still needs further study.For brushless DC motor control system problems, the paper elaborated on its basic structure, working principle and mathematical model and established a set of DSP (TMS320L F2407A) as the core of the brushless DC motor dual closed-loop control system design program. System performance was optimized from both hardware and software aspects. It used a brushless DC motor ASIC TDA5142T to realize hardware start-up, and position detection used the hardware way of back-EMF zero crossing detection, in addition, the drive circuit, current detection circuit and the external circuit has been designed separately. At the same time we made full use of DSP control speed and flexible features, Speed regulator used self-tuning fuzzy PID control algorithm, to optimize the power circuit opening angle-off control.Use current regulation to limit the current amplitude by the use of hysteresis current way .Use Matlab / Simulink to establish BLDCM sensorless simulation system based on modular design idea. The simulation results showed that by using the position detection in this article and parameter self-tuning fuzzy PID control algorithm, the system had significantly improved torque ripple, the transition of speed became smooth, response time was quick, the system general performance had been optimized.