US 7,321,229 B2
Inductive position sensors with secondary windings with increased or decreased number of turns
Jonathan Craig Tapson, Cape Town (South Africa)
Assigned to University of Cape Town, Cape Town (South Africa)
Filed on Feb. 21, 2006, as Appl. No. 11/358,905.
Application 11/358905 is a continuation of application No. PCT/ZA2004/000101, filed on Aug. 20, 2004.
Claims priority of provisional application 60/496554, filed on Aug. 20, 2003.
Prior Publication US 2006/0208725 A1, Sep. 21, 2006
Int. Cl. G01B 7/14 (2006.01)
U.S. Cl. 324—207.17  [324/207.24; 336/130; 340/870.36; 318/660] 12 Claims
OG exemplary drawing
 
1. A position sensor comprising:
a primary winding configured to generate a magnetic flux;
a first secondary winding comprising a number of turns which increases in one direction;
a second secondary winding comprising a number of turns which increases in an opposite direction to that of said first secondary winding;
said first secondary winding and said second secondary winding being subjected to a magnetic flux generated by said primary winding wherein voltages are induced in said first secondary winding and said second secondary winding; and,
an element movable with respect to said first secondary winding and said second secondary winding, wherein said element comprises a magnetic or conductive material and distorting, in its vicinity, said magnetic flux generated by said primary winding.