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Precise current sensor by means of small-angle magnetization rotation using amorphous wire and its industrial application

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3 Author(s)
Yoshida, Y. ; Dept. of Electron. Control Eng., Kitakyushu Nat. Coll. of Technol., Japan ; Tayaoka, A. ; Takaoka, E.

The precise current sensor described consists of a detecting element of the magnetic field produced by the measuring current, a compensator, and a feedback coil. The alternating excitation current flows with a frequency of 250 kHz through the amorphous wire that is a part of the detecting element. The excitation current causes a rotating field in the amorphous wire in the circular direction. The second harmonic voltage e2f occurs in the sense coil wound around the wire. The measuring current, which is at right angles to the wire, affects the rotating field, so that the e2f induced in the sense coil varies. The compensator consists of high-gain operational amplifiers. The sensor's components are described in detail, and the results of tests on the sensor are presented

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Magnetics, IEEE Transactions on  (Volume:29 ,  Issue: 6 )