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In recent years, with the development of society and technology , more and more enterprises adopt the automatic doors , automatic doors for its reliable, convenient , safety features have been widely used in high - end residential and office and other occasions , automatic doors not only beautify the entrances environment , and energy-saving , dust, noise , and other functions , is also an important indicator of the intelligent buildings . The core of an automatic door automatic door control system , to determine the performance of the automatic doors , require automatic doors low noise , smooth running , with the rapid development of power electronics technology and micro- control technology and mature brushless DC motor has a small size , light weight , high efficiency , low noise and high reliability as the automatic door drive motor , permanent magnet brushless DC motor has great research value . Brushless DC motor (Brushless DC Motor, referred BLDCM) with built - in position sensor to control the object based on the ADI's blackfin series of the chip blackfin531 the brushless DC motor speed control system design . Speed ??control system blackfin531 chip design , system operation speed , high precision , the motor speed curve smoothing . The control system for brushless DC motor speed control , drive mode applications mainstream space vector pulse width modulation manner ( SVPWM ) , the application of state-of-the-art SVPWM implementation method , sliding mode control module to improve the utilization of DC voltage , less small torque ripple at low speeds . The articles derive the mathematical model of the brushless DC motor , and simulation based on SVPWM algorithm in Simulink . Finally, in MATLAB simulation of the PI control and sliding mode control . The paper proposes a brushless DC motor speed and current double closed-loop digital control program , current loop and speed loop complex programmable logic device (CPLD) achieved so the system blackfin531 core processor , the power circuit three-phase bridge drive ADI VisualDSP development tools on software programming , design control and drive circuits . Finally, on the basis of theoretical analysis , simulation experiments and analysis of experimental results , the sliding mode control with the traditional PI control speed curves were compared . The simulation results show the superiority of the sliding mode vector control .
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