Patent ID: 7188533
Filing Date: 2007-03-13
Classification: G01D,G01L

Abstract:
1. An apparatus for measuring the relative displacement between a first shaft and a second shaft, comprising: a first rotor assembly being coupled to the first shaft and being centered on an axis; at least one magnet having a magnetic field and being disposed on the first rotor assembly; a second rotor assembly being coupled to the second shaft, the first and second rotor assemblies being coaxial, the second rotor assembly having a first stator plate and a second stator plate, the first and second stator plates forming a gap and having a plurality of teeth extending in a direction radial of the axis, wherein the plurality of teeth of the first stator plate do not axially intersect with the plurality of teeth of the seconds stator plate; and, a sensing device disposed within the gap for sensing a magnetic flux of the magnetic field.