Motor control apparatus

Details Motor control apparatus Motor control apparatus

2008-07-08

2008-07-08

Ip, Paul (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Sound, supersonic vibration or mechanical vibration

C318S085000, C318S162000, C416S034000

Reexamination Certificate

active

07397211

ABSTRACT:
A motor control apparatus includes a first FG pattern for generating a first induced voltage attendant upon rotation of the rotor of a motor; a second FG pattern for generating a second induced voltage due to noise; a differential amplifier for differentially amplifying the first and second induced voltages, which are input thereto; and a motor speed control unit for controlling rotation of the motor so as to achieve synchronization between the output of the differential amplifier and a prescribed frequency signal.

REFERENCES:
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patent: 4438377 (1984-03-01), Sakai et al.
patent: 5209116 (1993-05-01), Okumura
patent: 5221185 (1993-06-01), Pla et al.
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patent: 6570350 (2003-05-01), Ohno et al.
patent: 6850023 (2005-02-01), Lau
patent: 2002/0044769 (2002-04-01), Ohno et al.
patent: 2002/0143450 (2002-10-01), Fujimoto et al.
patent: 2007/0075658 (2007-04-01), Ishikawa
patent: 11-299283 (1999-10-01), None

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