Demagnetizing apparatus and method

Details Demagnetizing apparatus and method Demagnetizing apparatus and method

1987-09-21

1989-06-27

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361147, 361149, B25B 1100

Patent

active

048435163

ABSTRACT:
A chuck and a power transformer having a pair of secondaries for applying continuous unidirectional DC to the chuck. A pair of control transformers each having a pair of secondaries related to respective ones of the power secondaries, for producing opposite polarities on the chuck. A timer operable through a maximum time interval for controlling the control transformers and thereby producing DC on the chuck of a level according to that time interval, and settable to lesser time intervals for producing DC of correspondingly lesser levels. Means for producing DC in each of oppositee polarities, and each throughout a corresponding time interval according to the setting of the timer. Oscillator means controlling the control transformers for thereby controlling the power transformer for producing DC of opposite polarities in a series of steps, and interposing resistances of successively greater values in the steps to reduce the charge on the chuck to zero at the last step. The oscillator has a predetermined, adjustable time interval of operation and operates independently of the timer.

REFERENCES:
patent: 3401313 (1968-09-01), Littwin
patent: 3428867 (1969-02-01), Becker
patent: 4633361 (1986-12-01), Ela et al.

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