Device for the measurement of the angular position of a shaft, or similar

A method for contactless measurement of an angular position of a shaft, using a device for the measurement of the angular position of a shaft and a target, wherein said device for the measurement of the angular position of the shaft comprises a support upon which, firstly, a primary winding, and secondly at least two secondary windings in mutual phase opposition are configured, to form a first inductive positional sensor, comprising:

• configuring, on the exterior surface of the shaft, two helixes of opposing pitches, wherein the helixes are mutually spaced, within the range of angular measurement, at a predetermined distance which is a function of an estimated axial displacement of the shaft,
• providing the first inductive linear positional sensor,
• providing a second inductive linear positional sensor, wherein said second inductive positional sensor has at least two secondary windings in mutual phase opposition and arranged on the same support, opposite the secondary windings of the first inductive positional sensor with respect to a median line such that a motif is formed in each case on either side of said median line, wherein the primary winding encloses the secondary windings of the first inductive positional sensor and the second inductive positional sensor,
• arranging the first inductive positional sensor opposite a first helix, in order to deliver a signal which comprises, firstly, a representative component for longitudinal displacement of the shaft and, secondly, a representative component for the rotation thereof,
• arranging the second inductive positional sensor opposite the second helix, in order to deliver a signal which comprises, firstly, a representative component for the longitudinal displacement of the shaft and, secondly, a representative component for the rotation thereof, and
• determining the angular position of the shaft by a combination of signals delivered by the first positional sensor and by the second positional sensor in order to eliminate components which are representative of the translation of the shaft.