| 摘要 |
PROBLEM TO BE SOLVED: To improve a detection accuracy for angles of rotation by improving an output characteristic linearity to angles of rotation of a rotation angle- detecting apparatus. SOLUTION: A stator core 25 is coaxially arranged to the side of an inner circumference of a rotor core 24 rotating integrally with an object to be detected. A permanent magnet 27 of a half loop is fixed inside a recessed part 26 formed to one side of the rotor core 24. The permanent magnet 27 is parallel magnetized so that lines of magnetic force inside the magnet become parallel to each other. A Hall IC 31 is set to a magnetic flux detection gap part 30 formed to a central part of the stator core 25 to detect a density of a magnetic flux passing the magnetic flux detection gap part 30. In this case, since the permanent magnet 27 is parallel magnetized, a range where the magnetic flux density of the magnetic flux detection gap part 30 changes linearly in accordance with an angle of rotation of the rotor core 24 is enlarged, and a linearity of an output characteristic of the Hall IC 31 to the angle of rotation is improved.
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