Communications: electrical – Digital comparator systems
Patent
1976-03-30
1979-01-02
Caldwell, Sr., John W.
Communications: electrical
Digital comparator systems
324208, 336 75, 336 79, 340199, G08C 1906
Patent
active
041329805
ABSTRACT:
A core with at least three elongated legs, at least one leg being centrally located among all the elongated legs, is joined at at least one end by a yoke portion connecting all the legs. The central leg or legs is wound with a magnet winding close to the yoke portion of the core, with which the core is excited with an alternating field. A short-circuiting ring structure, which may be in the form of an apertured plate, encircles at least the central leg or legs of the core and is movable in the direction of elongation of the core in accordance with the movement of a body the displacement of which is to be measured. The legs of the core may be bent in order to measure rotational or angular displacement. Movement of the short-circuiting ring along the length of the core varies the inductance of the coil in a predetermined manner, which may be a linear relation to displacement. A yoke and a winding may be provided at the other end in order to increase the sensitivity by a differential method of measurement.
REFERENCES:
patent: 1028851 (1912-06-01), Bard
patent: 3205485 (1965-09-01), Noltingk
patent: 3820094 (1974-06-01), Mouri et al.
patent: 3973191 (1976-08-01), Zabler
patent: 4013986 (1977-03-01), Weckenmann
Caldwell Sr. John W.
Groody James J.
Robert & Bosch GmbH
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