Patent ID: 7385389
Filing Date: 2008-06-10
Classification: G01D

Abstract:
1. An absolute rotary encoder, comprising: a shaft; a stator; a rotor having a bore passing through the center thereof to receive the shaft therein and arranged rotatably about the shaft and opposite the stator; a track group including tracks arranged concentrically on the rotor; a transmitting winding group arranged on the stator as capable of flux coupling with the track group; and a receiving winding group arranged on the stator as capable of flux coupling with the track group, wherein each track in the track group comprises a flux coupling winding that includes linear are portions having first and second radii and arranged alternately on the rotor and has the shape of a ring continuous about the shaft, wherein the track group includes at least two tracks having the linear are portions different in number from each other, wherein the transmitting winding group is located more outward than the innermost receiving winding among a plurality of receiving windings contained in the receiving winding group.