Patent Number: 8,508,161

Title: Drive apparatus

Abstract: A drive apparatus includes a magnet rotor having a plurality of magnetic poles that are magnetized, a stator having a magnetic pole portion that opposes each pole of the magnet rotor, a coil configured to excite the magnetic pole portion, a position detector configured to detect a position of the magnet rotor, a first driver configured to switch an electrification state of the coil in accordance with a preset time interval, a second driver configured to switch an electrification state of the coil in accordance with an output of the position detector, and a controller configured to select the first driver when the output of the position detector is less than a first threshold, and to select the second driver when the output of the position detector is equal to or larger than the first threshold.

Inventors: Kiyamura; Kousuke (Kawasaki, JP), Yasuda; Hiromu (Kawasaki, JP), Aoshima; Chikara (Zama, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: H02P 6/04 (20060101)

Expiration Date: 2021-08-13 0:00:00