Rotary variable differential transformers

Details Rotary variable differential transformers Rotary variable differential transformers

1996-07-30

1997-12-23

Gellner, Michael L.

Inductor devices

Relatively movable coils

336132, 336133, 336134, 336135, H01F 2106

Patent

active

057011141

ABSTRACT:
A Rotary Variable Differential Transformer, having a short axial length, small diameter, and a wide angle, linear output range, is provided. The Rotary Variable Differential Transformer (RVDT) comprised of a housing, a hollow cylindrical coil form made of non-magnetic, non-conductive material, about which a first and second secondary coils, adjacent to each other, are circumferentially wound. A primary coil is circumferentially wound about a segment of said first secondary coil, and about a segment of said second secondary coil.
An elongated ferromagnetic core is disposed within the hollow coil form. The core is an axial section of a ferromagnetic cylinder which serves to couple said primary coil to said secondary coils.
The output voltage measured across said secondary coils terminals is indicative of the angular position of said ferromagnetic core relative to the coil form assembly.

REFERENCES:
patent: 3491321 (1970-01-01), Chass
patent: 3551866 (1970-12-01), Chass
patent: 3573693 (1971-04-01), Chass
patent: 3882436 (1975-05-01), Chass
patent: 4551699 (1985-11-01), de Jong et al.
patent: 4910488 (1990-03-01), Davis et al.

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