| 摘要 |
An energization timing determination circuit corrects a shift contained in a position signal outputted from a position detecting means and supplies energization timing appropriate to drive a motor. A correction amount computation unit computes detection intervals obtained based on position signals outputted from filters, comparators, and a position detection unit during one cycle of electrical angle. The correction amount computation unit thereby determines the duty shift length alpha and phase shift length beta of the position signals. A control circuit corrects energization timing based on the position signals according to the detected shift lengths.
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