Patent ID: 9431940
Filing Date: 2016-08-30
CPC Classification: G03G,H02P

Claim Text:
1. A motor control apparatus comprising: a supply unit configured to supply a current for excitation to a plurality of coils of a motor; a first detection unit configured to detect a physical quantity which varies depending on a change in inductance of at least one of the plurality of coils; a determination unit configured to determine a rotational position of a rotor of the motor based on the physical quantity detected by the first detection unit; a control unit configured to control the rotational position of the rotor of the motor based on a determination result by the determination unit, and a second detection unit configured to detect an induced voltage of each of the plurality of coils, wherein the determination unit is further configured to determine the rotational position of the rotor based on the physical quantity detected by the first detection unit when the rotor is at rest and when a rotational speed of the rotor is smaller than or equal to a predetermined value, and determine the rotational position of the rotor based on the induced voltage detected by the second detection unit when the rotational speed of the rotor is greater than the predetermined value.