Control and monitoring arrangements for an aperture closure...

Details Control and monitoring arrangements for an aperture closure... Control and monitoring arrangements for an aperture closure...

2004-03-19

2009-12-15

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

C318S282000, C318S468000

Reexamination Certificate

active

07633253

ABSTRACT:
Current through a motor is sensed to create a voltage which is amplified. The amplifier is followed by a high pass filter and a low pass filter. This recovers commutator pulses from the motor current, rejecting mains ripple and higher frequency noise. Commutator pulses are counted. Other arrangements could be used for injecting pulses into the motor supply, for counting at a remote position. Various techniques are described for controlling the motor in accordance with the result of counting.

REFERENCES:
patent: 4338553 (1982-07-01), Scott, Jr.
patent: 4713591 (1987-12-01), McCloskey
patent: 5132602 (1992-07-01), Jorgensen et al.
patent: 6107765 (2000-08-01), Fitzgibbon et al.
patent: 2002/0101210 (2002-08-01), Boisvert et al.
patent: 2117538 (1983-10-01), None
patent: 2186392 (1987-08-01), None
patent: 2271863 (1994-04-01), None
Patent Abstracts of Japan, Publication No. 01064581, Published Mar. 10, 1989.

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