Brushless DC motor control using digital PWM techniques

Residential and commercial appliances such as refrigerators and air conditioning systems have been using conventional motor drive technology. The machines in these applications typically have low efficiencies and high maintenance. Development of advanced motor drives has yielded increases in efficiency and reliability. A Brushless DC (BLDC) drives are known for higher efficiency, lower maintenance and higher cost This paper presents a simple digital pulse width modulation control technique for trapezoidal brushless DC (BLDC) motor drives. This digital control treats BLDC motor as a digital system and regulates speed with the help of two predefined state variables techniques, which makes the concept of controller extremely simple for design and implementation. This scheme reduces the cost and complexity of motor control hardware and in turn can boost the demand of BLDCM for mass production applications. The performance of the BLDC motor drive verified via simulations.