Movement responsive apparatus.

摘要

Apparatus (40) is disclosed which is responsive to the movement of a movable element (22) for generating a plurality of electrically phase-displaced signals containing information indicative of the direction, speed and distance of movement of said movable element (22). The apparatus comprises a plurality of position-displaced electrically conductive coils (102) and a permanent magnet (116) mounted adjacent each of said coils (102) for producing a path of normally substantially constant magnetic flux adjacent each of said coils. A flux varying device (90) is coupled (86) to the movable element and is responsive to the movement of the movable element (22) for varying the level of the magnetic flux adjacent each of the coils (102) in dependence upon the direction, speed and distance of movement of the movable element, whereby the resultant electromotive force induced in each of the coils (102) defines the plurality of electrically phase-displaced signals.