Vector control strategy of brushless DC motor and realization

LI Dongdong, PAN Haipeng, GU Minming

(Faculty of Mechanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China)

Abstract: Aiming at the problems of low efficiency, torque ripple and noise problem of brushless DC motor driven by traditional control method, the reasons for these phenomena were analyzed, a novel kind of sinusoidal wave drive strategy based on the vector control was proposed for BLDC and the brushless DC motor control system was developed. Inverter driving circuit, protection circuits for overvoltage as well as overcurrent and other hardware circuit were designed at the core of STM32F103VE controller. The results indicate that compared to sixstep commutation method, vector control can decrese the fluctuation of the commutation current by 52%, alleviate torque ripple and reduce running noise, which is quite suitable for equipments sensitive to running noise, such as air conditioner, kitchen ventilator. Thus, it has high application value.

Key words: vector control; brushless DC motor; rotor position; torque ripple