| 摘要 |
PROBLEM TO BE SOLVED: To improve the detection accuracy for angle of rotation. SOLUTION: Each of magnets 27 is fixed at a position facing a rotor core 24 in the radial direction thereof, and the magnets 27 are individually fixed so that the magnetic fields of the two magnets 27 repel each other inside the rotor core 24. The inner circumferential surface of the rotor core 24 is made to face the outer circumferential surface of a stator core 25 via a fine air gap, except for a portion near the magnets 27. In this arrangement, magnetic fluxes leaving the N poles of the magnets 27 return to the S poles of the magnets 27 in the path; the rotor core 24→the stator core 25→a magnetic detection gap part 29 (Hall IC 31)→the stator core 25 and→rotor core 24. As the rotor core 24 turns accompanying the rotation of an object to be detected, the density of the magnetic fluxes (the density of the magnetic fluxes interlinking to the Hall IC 31), passing through the magnetic detection gap part 29 of the stator core 25, varies according to the angle of rotation, and causes a change in the output of the Hall IC 31 according to the magnetic flux density.
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