公开(公告)号：US20240255539A1

公开(公告)日：2024-08-01

申请号：US18419329

申请日：2024-01-22

Applicant: Proterial, Ltd.

Inventor： Yohei SHIRAKAWA ,  Yoshiaki YANAGISAWA

IPC: G01P3/50 ,  B62D3/12 ,  G01R33/09

CPC classification number: G01P3/505 ,  B62D3/12 ,  G01R33/091

Abstract: 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.

公开(公告)号：US20240255317A1

公开(公告)日：2024-08-01

申请号：US18420840

申请日：2024-01-24

Applicant: Proterial, Ltd.

Inventor： Yohei SHIRAKAWA ,  Yuta SUGIYAMA ,  Naoki FUTAKUCHI ,  Yukio IKEDA ,  Yujiro TOMITA

IPC: G01D5/20

CPC classification number: G01D5/2053 ,  G01D2205/10

Abstract: A position detection device for detecting a position of a shaft moving forward and backward in an axial direction is provided with a detection object mounted on the shaft, a substrate disposed to face the detection object, an excitation coil that is mounted on the substrate and generates an AC magnetic field, a detection coil that is mounted on the substrate and arranged along the axial direction of the shaft and configured so that a magnitude of a voltage induced varies with a position of the detection object, and a sensor for detecting a physical quantity used to correct the position of the shaft by using a sensor coil configured by the excitation coil, the detection coil, or an other coil provided on the substrate.

公开(公告)号：US20240255316A1

公开(公告)日：2024-08-01

申请号：US18420288

申请日：2024-01-23

Applicant: Proterial, Ltd.

Inventor： Yohei SHIRAKAWA ,  Yoshiaki YANAGISAWA ,  Yoshitake AGEISHI ,  Yukio IKEDA ,  Masanori SAGAWA

IPC: G01D5/20 ,  B62D15/02

CPC classification number: G01D5/2053 ,  B62D15/0225

Abstract: 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 provided at 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, a calculation unit that calculates the position of the moving member based on an output voltage of the detection coil, and a magnetic field diffusion suppression member for suppressing a spread of a magnetic field generated by energization to the excitation coil.

公开(公告)号：US20240142277A1

公开(公告)日：2024-05-02

申请号：US18491352

申请日：2023-10-20

Applicant: Proterial, Ltd.

Inventor： Yohei SHIRAKAWA ,  Yuta SUGIYAMA ,  Yoshiaki YANAGISAWA ,  Yoshitake AGEISHI ,  Yukio IKEDA

IPC: G01D5/20

CPC classification number: G01D5/204

Abstract: A position detection device detects a position of a moving member moving backward and forward in a predetermined moving direction. The position detection device includes an exciting coil disposed along the moving member and extending in the moving direction, a detection coil that outputs a voltage corresponding to a position of a detection target portion moving with the moving member by means of a magnetic field generated by the exciting coil within a predetermined detection range in the moving direction, and a calculation unit that calculates the position of the moving member by the output voltage of the detection coil. The detection coil includes a pair of coil elements whose output voltage changes according to the position of the moving member, and phases of the output voltages of the pair of coil elements during movement of the moving member within the detection range differ from each other.

公开(公告)号：US20230251112A1

公开(公告)日：2023-08-10

申请号：US18107184

申请日：2023-02-08

Applicant: Proterial Ltd.

Inventor： Yohei SHIRAKAWA ,  Yuta SUGIYAMA ,  Yukio IKEDA

IPC: G01D5/20 ,  B62D15/02

CPC classification number: G01D5/204 ,  B62D15/0225

Abstract: A position detection device for detecting a position of a shaft moving forward and backward in an axial direction is provided with a detection object attached to the shaft, an excitation coil for generating an alternating magnetic field, and a detection coil arranged along an axial direction of the shaft. A magnitude of a voltage induced in the detection coil varies in accordance with a position of the detection object.