Title:
CONTROL AND MONITORING ARRANGEMENTS FOR AN APERTURE CLOSURE MEMBER
Document Type and Number:
WIPO Patent Application WO2004084397
Kind Code:
A3
Abstract:
Current through a motor (18) is sensed at (26) to create a voltage which is amplified at (30). The amplifier (30) is followed by a high pass filter (38) and a low pass filter (46). This recovers commutator pulses from the motor current, rejecting mains ripple and higher frequency noise. Commutator pulses are counted at (58). 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.
Inventors:
GUNTON BRUCE STANLEY (GB)
Application Number:
PCT/GB2004/001216
Publication Date:
December 09, 2004
Filing Date:
March 19, 2004
Export Citation:
Assignee:
GUNTON BRUCE STANLEY (GB)
International Classes:
G01P3/48; H02H7/085; H02P7/28; E05F15/00; (IPC1-7): E05F15/00; G01P3/44; H02P7/28
Foreign References:
| US5132602A | 1992-07-21 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 0132, no. 77 (E - 778) 26 June 1989 (1989-06-26)
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