Patent ID: 8436705
Filing Date: 2013-05-07
Classification: G01D,H01F

Abstract:
1. A method of obtaining a magnetic encoder, comprising: providing an annular magnetic encoder body having a plurality of annular, unmagnetized magnetic encoder tracks integral therewith and juxtaposed relative to each other; (a) covering, when one of the plurality of magnetic encoder tracks is magnetized, the other track with a magnetic shielding mask; (b) rotating the annular magnetic encoder and magnetizing the one of the tracks by a magnetizing head, the magnetizing head comprising a magnetizing yoke and an exciting coil; and repeating (a) and (b) for each of the plurality of magnetic encoder tracks, whereby a magnetic encoder having a plurality of magnetized encoder tracks with different patterns of magnetic poles or the same patterns of magnetic poles, but being displaced in phase, is obtained.