System and method for sensing angular position using ring magnet with sensor in flux return path
First Claim
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1. A system for outputting a signal representative of the angular position of a rotatable member, comprising:
- a ring magnet couplable to the rotatable member, the magnet defining magnetic flux lines, portions of the magnetic flux lines being main flux lines emanating away from the magnet and portions of the magnetic flux lines being return flux lines returning to the magnet; and
at least one magnetic field sensor disposed in at least one return flux line and outputting a signal representative of the angular position of the magnet.
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Abstract
A Hall effect sensor is positioned in the return lines of the magnetic flux of a ring magnet that is engaged with a rotating member the angular position of which is sought to be measured. The signal from the Hall sensor indicates the angular position of the rotating member.
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Citations
24 Claims
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1. A system for outputting a signal representative of the angular position of a rotatable member, comprising:
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a ring magnet couplable to the rotatable member, the magnet defining magnetic flux lines, portions of the magnetic flux lines being main flux lines emanating away from the magnet and portions of the magnetic flux lines being return flux lines returning to the magnet; and
at least one magnetic field sensor disposed in at least one return flux line and outputting a signal representative of the angular position of the magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining an angular position of a rotatable member, comprising:
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providing a disk-shaped magnet defining magnetic flux lines, portions of the magnetic flux lines being main flux lines and portions of the magnetic flux lines being return flux lines returning to the magnet;
sensing magnetic flux in at least one return flux line; and
outputting a signal representative of the angular position of the magnet, based on the sensing act. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An angular position sensing system, comprising:
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magnet means for generating a magnetic field; and
sensing means disposed in return flux lines generated by the magnet means for outputting a signal representative of an angular position. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification