360 Degree linear variable phase transformer

Details 360 Degree linear variable phase transformer 360 Degree linear variable phase transformer

1977-11-02

1981-10-27

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

324208, 336 45, 336136, G08C 1906, H01F 2106

Patent

active

042976987

ABSTRACT:
A linear variable phase transformer directly converts mechanical displacement information to phase information capable of varying fully over preferably more than a 120.degree. period of a typical AC cycle and up to 360.degree. or more phase variation. Three or more linearly arranged primary windings produce respective AC magnetic fluxes that are phase separated by equal amounts over such full period. A core, which is movably positioned relative to the primary windings, receives and/or combines one or more of such fluxes to produce an output flux that induces in a secondary winding an output AC electrical signal having a phase corresponding to that of the output flux and, thus, the positional relationship of the core and the primary windings. The output AC electrical signal is a time-based signal that can be utilized directly in analog applications or readily demodulated for digital use. The use of anti-fringing primary windings to reduce fringe effects and an elongated core that has an apparent or effective length shorter than its actual physical length also are disclosed.

REFERENCES:
patent: 2911632 (1959-11-01), Levine
patent: 2988697 (1961-06-01), Hirsch
patent: 3017590 (1962-01-01), Chass
patent: 3138772 (1964-06-01), Persons
patent: 3456132 (1969-07-01), Dechelotte
patent: 3582924 (1971-01-01), Uemura
patent: 3663911 (1972-05-01), Chass
patent: 3683345 (1972-08-01), Faulkes et al.
patent: 4083237 (1978-04-01), Levesque
patent: 4134065 (1979-01-01), Bauer et al.
Fitzgerald, A. E.; Kingsley, Charles Jr.; Kusko, Alexander, Electric Machinery, Third Edition, New York, 1971, p. 6.

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