| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic induction type rotational position sensor capable of obtaining a sine wave output by simple constitution. SOLUTION: This sensor has a stator 101 arranged concentrically with a plurality of magnetic pole pins 2, a rotor 105 arranged opposedly under a coaxial condition to the stator 101, a primary side excitation coil 104 arranged in the stator 101, and a secondary side induction coil 103 arranged in the each magnetic pole pin 2. A cross-sectional shape of the each magnetic pole pin 2 is formed into a sector shape around the rotation center 105a of the rotor 105 as the center to change sine-wave-likely an overlap area S of a magnetic substance 106 in the rotor 105 and the each magnetic pole pin 2, in response to a rotation angle position of the rotor 105, and a sine-wave-like irregular patterns are formed in an inner circumferential edge of the magnetic substance in the rotor 105. The sine-wave-like output is obtained from the secondary side induction coil 103, because the overlap area S is changed sine-wave-likely. COPYRIGHT: (C)2005,JPO&NCIPI
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