Linear variable differential transformer for a device for varying the pitch of a helix.

摘要

The present invention relates to a set of linear variable differential transformer (60) intended to produce a feedback signal representing the pitch of a blade in a device for varying the pitch. & br / & this assembly is characterized in that it comprises a target (62) mounted on the fluid feed tube (50), movable in translation, so as to move in translation in conjunction with the tube (50), this target (62) is formed of a magnetically permeable material, and at least one set of coils (70a, 70b) disposed coaxially around the tube for supplying fluid (50), and extending axially on the extension of the travel of the target (62), this set of coils (70a, 70b) comprising a pair of secondary windings (72, 76), spaced apart axially and a primary winding (74) located centrally between the secondary windings are spaced apart (72, 76)