Patent ID: 8405329

Claim:
A motor drive controller for controlling rotation of a magnetic rotor of a motor by flowing periodic current through coils of plural phases, said motor drive controller comprising: a position detector configured to detect and output positional signals representing rotational positions of the magnetic rotor at first resolution; a position change detector configured to detect and output position change signals representing positional changes of the magnetic rotor at second resolution higher than the first resolution; a phase synchronizing circuit configured to generate and output first absolute phase information at third resolution based on the positional signals and position change signals, said phase synchronizing circuit generating and outputting second absolute phase information representing rotational positions of the magnetic rotor at fourth resolution higher than the third resolution in synchronism with the first absolute phase information; and a drive voltage signal outputting device configured to output a drive voltage signal for flowing the periodic current through the coils of the plural phases in accordance with the second absolute phase information.