Inductive position indicator with ferromagnetic core - has measurement winding with voltage deviations compensated by reference winding

摘要

The magnetic core is movable between a primary winding supplied with a.c. at least one secondary winding. Secondary voltage corresponds to the core position. At least one turn of one or several secondary winding is so mounted in the path of an air-gap in the core, that a variable area is produced in the air-gap. A homogeneous magnetic field, independent from the core position is generated in it, so that a magnetic flux corresponding to the above area is linked with the turn. A further secondary (reference) winding (6) is in parallel with the secondary winding (4, 5) consisting of at least one turn and acting as the measurement winding. An independent from the core position part (A') of the surface (A) surrounded by the winding is linked with the magnetic flux in the core (1) air-gap.