| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of errors in detecting rotation angles, even when the set position of a magnetic detection element is misaligned in the x-axis direction, by eliminating the decrease or increase of the magnetic flux density passing through the magnetic detection element due to the misalignment. SOLUTION: A flux projecting magnet 6 and a flux receiving magnet 7 are made up so that the thickness along the arc direction, when viewed from z-axis direction, is thick at the center of the arc B1 and thin at the ends of the arc B2. Therefore, the distances from the inner peripheral surfaces of the flux projecting magnet 6 and flux receiving magnet 7 to a Hall element 2 become gradually larger toward the ends B2. Even when the Hall element 2 is misaligned in the x-axis direction due to assembling errors, changes in the magnetic flux density passing through the Hall element 2 due to the misalignment can be lost by the flux projecting magnet 6 and the flux receiving magnet 7 which are made thinner in the misaligned direction, and the errors in detecting the rotation angles can be prevented. COPYRIGHT: (C)2009,JPO&INPIT
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