Patent ID: 8624540

Claim:
A driving apparatus comprising: a rotor on which different magnetic poles are magnetized alternately in a circumferential direction; a first coil configured to be energized to excite a first yoke; a second coil configured to be energized to excite a second yoke; a first detection unit configured to alternately detect the different magnetic poles of the rotor when the rotor is rotated, thereby outputting a signal; a second detection unit configured to alternately detect the different magnetic poles of the rotor when the rotor is rotated, thereby outputting a signal of a phase different from that of the signal which is output from the first detection unit; a time measurement unit configured to measure a first time from after the first detection unit detects a change of the magnetic pole of the rotor and measure a second time from after the second detection unit detects the change of the magnetic pole of the rotor; a correction value output unit configured to output correction values for correcting a difference between the signal which is output from the first detection unit when the first coil and the second coil are not energized and the signal which is output from the first detection unit when the first coil and the second coil are energized, and a difference between the signal which is output from the second detection unit when the first coil and the second coil are not energized and the signal which is output from the second detection unit when the first coil and the second coil are energized; and an energization control unit configured to switch an energization direction of the first coil on the basis of the first time which is measured by the time measurement unit and the correction value which is output from the correction value output unit and switch an energization direction of the second coil on the basis of the second time which is measured by the time measurement unit and the correction value which is output from the correction value output unit.