360 degree linear variable phase transformer

Details 360 degree linear variable phase transformer 360 degree linear variable phase transformer

G - Physics

01

B

336/39, 340/135.

G01B 7/00 (2006.01) G01D 5/20 (2006.01) G01D 5/22 (2006.01)

Patent

CA 1139394

ABSTRACT OF THE DISCLOSURE A linear variable phase transformer directly converts mechanical displace- ment information to phase information capable of varying fully over preferably more than a 120° period of a typical AC cycle and up to 360° 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.

314742

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