Brushless DC motor and image pickup apparatus

Details Brushless DC motor and image pickup apparatus Brushless DC motor and image pickup apparatus

2009-01-30

2011-10-04

Ip, Paul (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400140, C318S565000, C359S824000

Reexamination Certificate

active

08030865

ABSTRACT:
A brushless DC motor configured to drive a driven member includes a rotor having a magnet, a stator having a coil configured to provide a rotational force to the magnet, a position detector configured to output a first signal that is periodic, in accordance with a rotating position of the rotor, a signal generator configured to generate a second signal by adding a lead angle to a phase of the first signal output from the position detector, an excitation switch configured to select an excitation to the coil in accordance with the second signal, and a phase change part configured to change the lead angle in accordance with at least one of a position and a moving direction of the driven member.

REFERENCES:
patent: 7436139 (2008-10-01), Maslov et al.
patent: 2004/0061470 (2004-04-01), Ito et al.
patent: 2004/0145330 (2004-07-01), Maslov et al.
patent: 1754305 (2006-03-01), None
patent: 06-067259 (1994-03-01), None
patent: 100643168 (2006-10-01), None
The above references were cited in a Sep. 3, 2010 Chinese Office Action, a copy of which is enclosed with English Translation, that issued in Chinese Patent Application No. 200910005597.8.
The above reference was cited in a Nov. 10, 2010 Korean Office Action, a copy of which is enclosed without an English Translation, that issued in Korean Patent Application No. 10-2009-0007847.

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