Hitachi Cable, Inc.

Song Ouyang

Yukio Ikeda

Ryoichi Menju

Kouichi Sato

A magnetostrictive torque sensor having: a rotating shaft to rotate around a center axis, the rotating shaft having magnetostrictive characteristics; and a cylindrical magnetic core disposed at a predetermined distance on an outer periphery of the rotating shaft, the cylindrical magnetic core having a detection coil disposed on an inner periphery thereof to detect a torque applied to the rotating shaft. The detection coil is formed with a coil assembly to form a bridged circuit, and the coil assembly is formed with a flexible substrate coil disposed on a whole inner periphery of the magnetic core.

Magnetostrictive torque sensor

A magnetostrictive torque sensor comprises a rotary shaft rotating around its center axis and having a magnetostrictive characteristic and a cylindrical ferrite magnetic core disposed at a predetermined distance from the outer periphery of the rotary shaft and coaxially with the rotary shaft and having on its inner peripheral surface a coil serving to detect the strain of the rotary shaft and having an insulating cover. The cylindrical ferrite magnetic core has a pair of opposed coil-forming inner peripheral surfaces defined by dividing the inner peripheral surface into two parts along a plane including the center axis. The coil has, on the respective opposed paired inner peripheral surfaces, a first coil including a going-current coil and a returning-current coil disposed in the same position at an angle of +45&#xb0; to the center axis, adapted to flow a going current and a returning current in the same direction, and connected in series and a second coil including a going-current coil and a returning-current coil disposed in the same position at an angle of &#x2212;45&#xb0; to the center axis, crossing the first coil at right angles, adapted to flow a going current and a returning current in the same direction, and connected in series.

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Hitachi, Japan

Song Ouyang