Demagnetizable electropermanent magnetic holder

Details Demagnetizable electropermanent magnetic holder Demagnetizable electropermanent magnetic holder

1997-09-29

1999-11-30

Fleming, Fritz

Electricity: electrical systems and devices

Demagnetizing systems and processes

361149, H01F 1300

Patent

active

059953586

ABSTRACT:
A holder having at least one magnetizable body surrounded by a coil is demagnetized by passing through the coil a succession of groups of pulses. The pulses of each group are of the same polarity and the polarity of each group of pulses is opposite that of the preceding group while the current of the pulses of each group is less than that of the pulses of the preceding group. Each group has 2 to 8 identical pulses and the pulses are formed by clipping an incoming alternating-current line voltage.

REFERENCES:
patent: 2632035 (1953-03-01), Jaeger
patent: 3086148 (1963-04-01), Soneki
patent: 4218722 (1980-08-01), Yoshizawa
patent: 4370693 (1983-01-01), McDonald et al.
patent: 4462059 (1984-07-01), Yamagami et al.
Degaussing electromagnetic articles by the phase control of AC power, J. Reed, Western Electric Technical Digest No. 33, Jan. 1974.

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