Compensation method for commutation torque ripple reduction of BLDC motor with misaligned hall sensors

Ideal Hall sensors installation interval is 120° electrical angle, however, the inevitable mechanical installation error may cause Hall signals delay or advance, aggravating seriously electromagnetic torque ripple. This paper presents a novel compensation method for commutation torque ripple reduction of Brushless DC motor (BLDC motor) with misaligned Hall sensors. First of all, by comparing phase current stable value with outgoing phase current detected at rising edge of the corresponding Hall signal, Hall sensors delayed or advanced installation is determined. And then, Hall sensors installation error angle can be obtained by deriving the relationship between three phase currents and error angle, which can be compensated by the optimal delayed angle for minimizing commutation torque ripple. At last, the simulation results verify the effectiveness of the theories and the feasibility of the proposed method.