Patent ID: 8866421

Claim:
A motor drive controller to drive and control a motor that has a rotor and multi-phase coils inside the rotor, based on multiple rotational angle detectors that generate multiple sensor signals corresponding to different positions of the rotor; the motor drive controller comprising: a first phase detector to compare a respective one of multiple sensor signals with a paired sensor signal from the same rotational angle detector to detect phases of the rotor, and output a first phase information signal representing a first detected phase; a phase divider to divide the phases, detected by the first phase detector, into multiple predetermined phase intervals; a signal selector to select one of the respective multiple sensor signals from the multiple rotational angle detectors, in the multiple predetermined phase interval; and a second phase detector to detect whether the signal selected by the signal selector reaches a predetermined threshold level corresponding to a predetermined phase of the rotor, and output a second phase information signal representing a second detected phase different from the first detected phase.