Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-08-09
1991-05-14
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
32420717, 336 87, 336134, G08B 2100
Patent
active
050159984
ABSTRACT:
A position sensor includes of two primary sense windings for establishing a forward or drive field, two secondary sense windings in which a voltage may be induced in the presence of the drive field, and at least one conductive screen capable of blocking the magnetic coupling between the primary and secondary sense windings. When the screen blocks the magnetic coupling between one pair of sense windings to the same extent that ti does between the other pair of sense windings, the sensor circuitry generates a marker signal to indicate the position of the screen.
REFERENCES:
patent: 3205485 (1965-09-01), Noltingk
patent: 4737698 (1988-04-01), McMullin et al.
Ellis George H.
Kirby James C.
Kollmorgen Corporation
Swann III Glen R.
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