Rotation angle measurement apparatus
First Claim
1. A rotation angle information output apparatus comprising:
- a plurality of Hall elements;
a magnetic flux concentrator provided on magnetosensitive planes of the plurality of Hall elements;
a rotating magnet arranged in proximity to the magnetic flux concentrator to cover the magnetic flux concentrator in a planer view;
an angle information output unit configured to output a plurality of pieces of rotation angle information of the rotating magnet; and
a failure information output unit configured to output failure information in consideration of the plurality of pieces of rotation angle information when at least a part of the rotation angle information output apparatus has a failure.
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Abstract
A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle θ of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle θc of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.
21 Citations
9 Claims
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1. A rotation angle information output apparatus comprising:
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a plurality of Hall elements; a magnetic flux concentrator provided on magnetosensitive planes of the plurality of Hall elements; a rotating magnet arranged in proximity to the magnetic flux concentrator to cover the magnetic flux concentrator in a planer view; an angle information output unit configured to output a plurality of pieces of rotation angle information of the rotating magnet; and a failure information output unit configured to output failure information in consideration of the plurality of pieces of rotation angle information when at least a part of the rotation angle information output apparatus has a failure. - View Dependent Claims (2, 3)
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4. A rotation angle information output apparatus comprising:
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a plurality of Hall elements; a magnetic flux concentrator provided on magnetosensitive planes of the plurality of Hall elements; a rotating magnet arranged in proximity to the magnetic flux concentrator to cover the magnetic flux concentrator in a planer view; an angle information output unit configured to output rotation angle information of the rotating magnet; an amplitude information output unit configured to output a plurality of pieces of amplitude information representing the magnetic field strength from the rotating magnet; and a failure information output unit configured to output failure information in consideration of the plurality of pieces of amplitude information when at least a part of the rotation angle information output apparatus has a failure. - View Dependent Claims (5, 6)
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7. A rotation angle information output apparatus comprising:
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a plurality of Hall elements; a magnetic flux concentrator provided on magnetosensitive planes of the plurality of Hall elements; a rotating magnet arranged in proximity to the magnetic flux concentrator to cover the magnetic flux concentrator in a planer view; an angle information output unit configured to output a plurality of pieces of rotation angle information of the rotating magnet; an amplitude information output unit configured to output a plurality of pieces of amplitude information representing the magnetic field strength from the rotating magnet; and a failure information output unit configured to output failure information in consideration of the plurality of pieces of amplitude information when at least a part of the rotation angle information output apparatus has a failure. - View Dependent Claims (8, 9)
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Specification