| 摘要 |
A position sensor coder of the type comprising a multipolar magnetic annulus (2) provided at its circumference with poles having polarities of opposite signs, the coder including at least one mark zone (Pi) presenting an angular width (Li) greater than the angular width of each of the alternating poles situated outside said zone around the circumference of the annulus, the coder being characterized in that said mark zone (Pi) comprises two adjacent singular poles (Ni, Si) presenting polarities of opposite signs and placed in the continuity of pole alternation in the annulus (2) and of angular width that is greater than the angular width of the poles lying outside the mark zone, the magnetization within the singular poles varying gradually in continuous manner between the two ends of the mark zone.
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