Patent ID: 6925893
Filing Date: 2005-08-09
Classification: G01D,G01L

Abstract:
1. In a rotation sensor comprising a first rotor mounted to one of first and second shafts arranged for relative rotation, constituted by a magnetic material, and having an outer face thereof provided with one or more conductive layers; a second rotor mounted to the other of the first and second shafts and having one or more metal members corresponding to the one or more conductive layers of the first rotor; a stationary core fixed to a stationary member and having a stationary core body; and one or more exciting coils accommodated in the stationary core body, operable when supplied with an AC current, and having inductance thereof varying with a change in a relative rotation angle of the first and second rotors, the second rotor being disposed between the first rotor and the stationary core, the improvement comprising: an electrically conductive casing that receives and retains therein the stationary core, and a layer of air provided between said electrically conductive casing and said stationary core body.