Common-grounded BLDCM Drive System Based on FPGA

This paper proposed a kind of common-grounded brushless DC motor (BLDCM) drive system based on field programmed gate array (FPGA) control. The proposed system has two characteristics: one is that the former 60deg of every drive lag applies pulse width modulation (PWM) and the latter 60deg conducts constantly(PWM_ON modulation); the other is that there are no isolating optical couplers between control circuit and drive circuit. So the proposed system has some advantages such as reducing ripple of electromagnetic torque, simplifying drive circuit to reduce the delay of signals, and reducing the cost and bulk of drive system. A prototype is designed based on FPGA chip, and experimental results demonstrated the validity of relative theory.