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Current control technique research on permanent magnet brushless motor of aviation

By studying the circuit equation in the process of commutations of brushless DC motor (BLDCM), the reason of phase current ripple is pointed out. The effect of phase current ripple to electromagnetic torque is analyzed. The deficiency of conventional current closed-loop control is studied. On the base of analysis a new current closed-loop control method is proposed. Phase current is inputted to PI controller which generates PWM signal to reduce its ripple. Finally, the relevant wave-forms are simulated in the Matlab environment. The simulation result shows that the new method can control phase current in real time, reduce the ripple of phase current and electromagnetic torque effectively, and improve the system efficiency.