Patent ID: 7420362

Claim:
Sensor arrangement for the collection of stroke data for a movable element, in particular by an actuator movable through a control member, said arrangement comprising an active coil ( 18 . 1 ) located a distance from at least one passive coil ( 26 . 1 , 26 . 2 ) exhibiting coil arrangement ( 18 ); having a current supply ( 30 ); and a signal collector ( 29 ); and an axially movable rod-shaped sensor part ( 17 ) preferably formed from a magnetizable material, said rod-shaped sensor part axially moving back and forth the movable control member in connection therewith between end positions and having a long axis ending in a trailing edge ( 23 . 1 , 23 . 2 ); wherein a short-circuit element ( 23 , 23 . 0 ) is provided that is formed from an electrical-conductive material having a small Ohmic resistance, said short-circuit element extending so as to limit the direction of motion as defined by at least one of the given stroke-height (h) defined end position (I, II), and a trailing edge ( 23 . 1 , 23 . 2 , 23 . 3 ) wherein at least a short-circuit element ( 23 ) is enclosed by the active coil ( 18 . 1 ) and another trailing edge ( 23 . 1 , 23 . 2 , 23 . 3 ) of at least a short-circuit element ( 23 , 23 . 0 ) is at least partly covered by at least one passive coil ( 26 . 1 , 26 . 2 ) and the passive coil is activated upon reaching one of the end positions of a linear movement producing measuring signal.