Patent ID: 7053602
Filing Date: 2006-05-30
Classification: G01D

Abstract:
1. A rotation sensor for detecting an angle of rotation of a rotating member, comprising: a rotor mounted to the rotating member for rotation together therewith, said rotor having an annular element; a magnetic coil/core unit arranged opposite to said annular element and fixed to a fixing member, said magnetic coil/core unit including a core body, and an excitation coil for carrying an AC current and forming a magnetic circuit, wherein said annular element having a width varying along a circumferential direction of said rotor such that when said rotor is rotated, said annular element causes impedance of the exciting coil to change in accordance with a rotation angle of said rotor; and a detection device electrically connected to the exciting coil, for measuring a rotation angle of the rotating member based on change in the impedance of the exciting coil.