Patent ID: 7265685
Filing Date: 2007-09-04
Classification: G01D

Abstract:
1. An encoder for a rotary position sensor, including a multipolar magnetic ring driven into rotation around its axis (x), and provided on its circumference with magnetic poles of a given sign (P i ) alternately positioned with magnetic poles of an opposite sign (P i+1 ) so as to form at least one series of at least one pair of magnetic poles with a determined period (T i ), each said magnetic pole (P i ) of a given sign having a width I i and a magnetic polarization value M i , with each magnetic pole of opposite sign (P i+1 ) having a width I i+1 different from width I i and a magnetic polarization value M i+1 , the magnetic poles having a polarization (P i , P i+1 ) such that M i ×I i =M i+1 ×I i+1 .