Patent ID: 8035327
Filing Date: 2011-10-11
Classification: H02P

Abstract:
1. A motor drive unit comprising: a motor having a coil and a rotor; a rotor position detector configured to output signals on the basis of a position of a rotor; and a controller configured to drive the motor to a target position by using a first driving mode in which a state of energization of the coils of the motor is switched in accordance with outputs from the rotor position detector and a second driving mode in which a state of energization of the coils is switched on the basis of a predetermined time interval, wherein, the controller turns on the energization of the coils during a predetermined time under an energization condition at a completion of driving to the target position when the rotor position detector detects that the rotor position shifts from the target position after turning off the energization of the coils according to the completion of driving to the target position.