| 摘要 |
The position sensor has a casing(1) and a disc casing(6) surrounding a common axis(2), either one of the casings(1,6) can enclose the other with an airgap(e) between their respective mutually opposite faces. The two casings are movable with respect to each other, by rotation(4) around the axis(2) and/or linearly(5) along the axis(2). One of the casings(1) has a magnet(7) with an axial revolution surface(8) having a axial variable diameter. The other casing(6) has a flux return ring fitted with at least two probes(9,10) separated from each other by an angular distance which is a function of the number of pole pairs of the magnet. A first probe(9) is fitted on the part of the disc(6) crossed by a return magnetic flux which is at a minimum when the magnet and the disc are at a reference angular position with respect to each other and being designed to supply a variable output signal which is a function of the mutual rotation of the two casings. A second probe(10) is fixed on the disc part crossed by the return magnetic flux which is at its maximum when the disc and magnet are in another angular reference position and is designed to supply a variable signal which is a function of the value of the airgap which itself varies as a function of the mutual axial position of the two casings. |
