Patent ID: 8872453
Filing Date: 2014-10-28
Classification: H02P

Abstract:
1. 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 differential sensor signals corresponding to different positions of the rotor; the motor drive controller comprising: a signal amplifier-converter circuit to amplify and convert the differential sensor signals into single-ended sensor signals; a first phase detector to compare the multiple single-ended sensor signals with multiple predetermined threshold levels to detect phases of the rotor, and output a first phase information signal representing a first detected phase; a second phase detector to compare a respective one of the multiple single-ended sensor signals with another of the single-ended sensor signals from the different rotational detector via the signal amplifier-converter circuit to detect the phases of the rotor, and output a second phase information signal representing a second detected phase; a phase divider to divide the phases, detected by the second phase detector, into multiple predetermined phase intervals; a signal selector to select one of the respective multiple single-ended sensor signals from the signal amplifier-converter circuit in the multiple predetermined phase interval; and a third 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 third phase information signal representing a third detected phase different from the first detected phase and the second detected phase.