Rotary magnetic position sensor having pole differentiated magnets
AssigneeDelphi Technologies, Inc.
InventorClaudia Ramirez
Life of this patent
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Abstract
The present invention is a rotary magnetic position sensor having a pair of pole differentiated permanent magnets, wherein rotation of a magnetic field relative to a magnetosensitive device provides a varying output of the magnetosensitive device that varies sinusoidally with the angle of relative rotation. The magnetic pole differentiation is achieved by an external asymmetric geometrical feature of the magnets, as for example a wedge shape involving a pole face chamfer or a corner chamfer at a same polarity pole face.
Claims7
At least two permanent magnets, wherein each permanent magnet comprises a predetermed geometrical shape, said shape having a predetermined external asymmetric geometrical feature;
- wherein each magnet of said pair of permanent magnets is identical with respect to the other;
- and
- wherein said external asymmetric geometrical feature differentiates the north and south magnetic poles of each said magnet.
A rotary magnetic position sensor, comprising:
- a stator;
- at least one magnetosensitive device connected with said stator, said at least one magnetosensitive device having a sensing surface;
- a rotor mounted around said stator, wherein one of said stator and said rotor is rotatable about a rotation axis, wherein said sensing surface is oriented parallel to said axis of rotation;
- and
- a pair of permanent magnets attached to said rotor in diametric opposition to each other, wherein said magnets have opposite poles facing each other such as to provide a magnetic field passing through said at least one magnetosensitive device at an orientation normal to said axis of rotation, wherein the magnetic field is substantially uniform over an area at least as large as said sensor surface;
- and wherein each said magnet comprises:
- a predetermed geometrical shape, said shape having a predetermined external asymmetric geometrical feature;
- wherein each said magnet is identical with respect to the other;
- and
- wherein said external asymmetric geometrical feature differentiates the north and south magnetic poles of each said magnet.
A rotary magnetic position sensor, comprising:
- a stator;
- at least one magnetosensitive device connected with said stator, said at least one magnetosensitive device having a sensing surface;
- a rotor mounted around said stator, wherein one of said stator and said rotor is rotatable about a rotation axis, wherein said sensing surface is oriented parallel to said axis of rotation;
- and
- a pair of permanent magnets attached to said rotor in diametric opposition to each other, wherein said magnets have opposite poles facing each other such as to provide a magnetic field passing through said at least one magnetosensitive device at an orientation normal to said axis of rotation, wherein the magnetic field is substantially uniform over an area at least as large as said sensor surface;
- and wherein each said magnet comprises:
- a predetermed geometrical shape, said shape having a predetermined external asymmetric geometrical feature comprising a wedge shape involving a pole face chamfer, wherein each of said north and south poles has a respective pole face, and wherein the pole faces have different areas;
- wherein each said magnet is identical with respect to the other;
- and
- wherein said external asymmetric geometrical feature differentiates the north and south magnetic poles of each said magnet.
Dependencies are inferred from the claim text.