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Compensation of misalignment effect of hall sensors for BLDC motor drives

In this paper, a novel compensating method of the misalignment effect of hall sensors for brushless DC (BLDC) motor drives is proposed. The discrete Fourier transform (DFT) is applied to obtain the magnitude of the fundamental frequency component which is proportional to the interval between two adjacent hall-sensor signals, from which the relative misalignment error is identified. In addition, the back-electromotive force (BEMF) signals are used to compensate for the absolute misalignment error. The effectiveness of the proposed method is verified by the simulation and experimental results, where the torque ripples are decreased by 6.2% in experiment.