Magnetizing system

Details Magnetizing system Magnetizing system

1980-11-10

1982-11-16

Rubinson, G. Z.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361148, 335284, G01R 3312

Patent

active

043597653

ABSTRACT:
A magnetizing system including a FLIP-FLOP and an integrating circuit operative to control a conduction phase of a unidirectional thyristor through a gating circuit so as to supply to an iron-core coil an increasing magnetizing current from an AC source through the thyristor so as to magnetize a horseshoe steel member. When a comparator determines that the magnetization amount of the steel member, sensed by a Hall effect element, equals 1.2 to 1.3 times a reference amount, the magnetizing current is stopped. Similar components for effecting demagnetization are then operated in the same manner so as to demagnetize the steel member with an increasing unidirectional current opposite in sense to the magnetizing current or an increasing bidirectional current until the sensed magnetization amount equals the reference amount. At that time, the demagnetizing current is stopped.

REFERENCES:
patent: 2930944 (1960-03-01), Yonkers
patent: 4074197 (1978-02-01), Bader
patent: 4104591 (1978-08-01), Reuting
"Precision Magnetizer", Gibb et al., IBM Tech. Disclosure Bulletin, vol. 21, No. 11, Apr. 79.
"Handbook of Electrical Engineering", Electric Society of Japan, Apr. 1978, pp. 492-495.
"Manual of Electrical Measurements", J. Yamauchi, Nov. 1966, p. 441.

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