The Furukawa Electric Co., Ltd.

Tsuyoshi Nakamoto

Kazuhiko Matsuzaki

Kengo Tanaka

Fumihiko Abe

Dongzhi Jin

Kosuke Yamawaki

Masakazu Matsui

Takahiro Ueno

Tomotaka Watanabe

Hideharu Yonehara

Masahiro Hasegawa

Norihisa Shibayama

A rotation sensor includes a first rotor constituted by a magnetic material and having an outer face that has first conductive layers disposed in two levels as viewed in the direction of a rotation axis and second conductive layers disposed outwardly of and between the first conductive layers, a second rotor having metal members corresponding to the first conductive layers of the first rotor, and a stationary core having a stationary core body that accommodates therein two exciting coils that are spaced from each other in the direction of the rotation axis. The second rotor is disposed between the first rotor mounted to a first shaft and the stationary core fixed to a stationary member, and is mounted to a second shaft which is rotatable relative to the first shaft.

Rotation sensor mounted on a shaft

A displacement sensor comprising: a detecting portion including a coil arranged in such manner that a relative position to a magnetic response substance varies in correspondence to a displacement of an object to be measured; an oscillating circuit to supply an alternating-current signal with a prescribed frequency to the detecting portion; an externally attached circuit connected to the detecting portion; and a displacement detecting means to detect the displacement of the object to be measured based on an amount of phase variation of an impedance in the detecting portion and the externally attached circuit, wherein parameters of the externally attached circuit are set in such manner that the amount of the phase variation by the displacement becomes larger than the amount of the phase variation by temperature variation.

Displacement sensor having a phase variation of an impedance

Rotation sensor

The rotation sensor () has a cylindrical first rotor () made of an insulating magnetic material, having conductor layers () arranged circumferentially, the first rotor being attached to a rotating first shaft () at a predetermined axial position; a fixed core () having an exciting coil (), the core being fixed to a fixing member with a space secured in the axial direction with respect to the first shaft; a second rotor () having nonmagnetic metal bodies () arranged circumferentially to oppose the conductor layers respectively, the second rotor being attached to a second shaft located adjacent to and rotating relative to the first shaft () and being located between the first rotor () and the fixed core (); and oscillating device connected to the exciting coil (), the oscillating device transmitting an oscillation signal of a specific frequency. The rotation sensor has rotation guides () for guiding rotation of the first and second rotors () respectively with respect to the fixed core ().

Growing community of inventors

Tokyo, Japan

Tsuyoshi Nakamoto