Brushless DC motor (BLDC) is widely used in various fields because of its good controllability, speed regulation performance, energy consumption and maintenance convenience. This paper first introduces the mathematical model of Brushless DC motor, and analyzes the technology of sensorless three stage starting and zero crossing commutation. The zero crossing point is determined by using the back EMF information,and the commutation time of the motor is determined according to the zero crossing information. An improved brushless DC motor sensorless control method based on the back EMF information is proposed. A brushless DC motor control platform based on STM32 is designed. The experiment results show that the control scheme achieves the effect of Holzer sensor brushless DC motor control scheme.
THE WORLD OF INVERTERS