Quick response large current sensor using amorphous MI element resonant multivibrator

Author

Inada, K. ; Mohri, K. ; Inuzuka, K.

Author_Institution

Dept. of Electr. Eng., Nagoya Univ., Japan

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4623

Lastpage

4625

Abstract

A non-contact type small sized large current sensor for inverter controls was constructed utilizing the magnetoimpedance (MI) effect of negative-magnetostrictive amorphous wires (CoSiB) of 5-mm length used as field sensing heads of a resonant type of multivibrator sensor. The sensor head could be set close to a conductor bar by using a negative feedback circuit, which simultaneously improved linearity, dynamic frequency characteristics, temperature stability, temperature variations, and signal-to-noise ratio. Experimental results for detection of DC and AC currents up to 500 A at 25 mm distance (40 Oe) and 2000 A at head angle of 80°C with the cut-off frequency of 300 kHz showed good linearity with less than 0.5% FS non-linearity and temperature stability with less than 0.01%/°C FS variation up to 130°C

Keywords

amorphous magnetic materials; boron alloys; cobalt alloys; electric current measurement; induction motor drives; machine control; magnetic sensors; magnetostrictive devices; multivibrators; silicon alloys; 130 C; 2000 A; 300 kHz; 5 mm; 500 A; AC current detection; CoSiB; DC current detection; cut-off frequency; dynamic frequency characteristics; field sensing heads; induction motor secondary current sensor; inverter control; inverter drive power electronics; large current sensor; linearity; magnetoimpedance effect; negative feedback circuit; negative-magnetostrictive amorphous wires; noncontact type; quick response; resonant multivibrator sensor; signal-to-noise ratio; temperature stability; temperature variations; Amorphous magnetic materials; Amorphous materials; Inverters; Linearity; Magnetic heads; Magnetic resonance; Magnetic sensors; Sensor phenomena and characterization; Size control; Temperature sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334169

Filename

334169