Quick response large current sensor using amorphous MI element resonant multivibrator
- Nagoya Univ. (Japan). Dept. of Electrical Engineering
A non-contact type small sized large current sensor for inverter controls was constructed utilizing the magneto-impedance (MI) effect of negative-magnetostrictive amorphous wires (CoSiB) of 5-mm length used as field sensing heads of a resonant type multivibrator sensor. The sensor head could be set close to a conductor bar by using a negative feedback circuit, which simultaneously improved linearity, dynamic range, frequency characteristics, temperature stability against 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 2,000 A at head angle of 80[degree] 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%/[degree]C FS variation up to 130 C.
- OSTI ID:
- 6653075
- Report Number(s):
- CONF-940629--
- Journal Information:
- IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Vol. 30:6Pt1; ISSN IEMGAQ; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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