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    • 57. 发明公开
    • POSITION DETECTION DEVICE
    • US20240255539A1
    • 2024-08-01
    • US18419329
    • 2024-01-22
    • Proterial, Ltd.
    • Yohei SHIRAKAWAYoshiaki YANAGISAWA
    • G01P3/50B62D3/12G01R33/09
    • G01P3/505B62D3/12G01R33/091
    • A position detection device for detecting a position of a moving member moving forward and backward in a predetermined moving direction is provided with a detection object attached to the moving member, a substrate provided with an excitation coil for generating a magnetic field in an area including the detection object and a detection coil being interlinked with a magnetic flux of the magnetic field, a power supply unit for supplying an alternating current to the excitation coil, and a calculation unit that calculates the position of the moving member based on an output voltage of the detection coil. The detection coil is shaped as a combination of a pair of curved portions that are symmetrical across a symmetry axis parallel to the moving direction of the moving member. Each of the curved portions is shaped as a sinusoidal fundamental wave component superimposed with a harmonic component of a third or higher order multiplied by each of coefficients corresponding to the order. The coefficients are adjusted in such a manner that a peak value of a voltage induced in the detection coil changes sinusoidally when the detection object moves at a constant speed relative to the substrate while facing a part of the substrate.