Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-09-17
1987-01-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324243, 340572, 361152, G08B 1324, G01R 3300
Patent
active
046349758
ABSTRACT:
Methods and apparatus for producing alternating electromagnetic fields for use in theft detection and surveillance systems include individual series-type electrical drive circuits for separately energizing each of the field-generating coil windings with maximum efficiency and control, and transformer-type coupling between the different field-generating coil drive circuits to effect balanced and equalized current flow in the different coil windings and thereby enhance both drive efficiency and field uniformity. Additionally, a current-sense winding provides for monitoring of field coil current flow, and for feedback control of the magnitude and/or frequency of the coil excitation drive. In a preferred embodiment, the fields are generated by at least two coils on each opposite side of the field, and the coils are separately energized through separate but commonly-coupled drive circuits.
REFERENCES:
patent: 3665449 (1972-05-01), Elder et al.
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3758849 (1973-09-01), Susman et al.
patent: 4300183 (1981-11-01), Richardson
patent: 4309697 (1982-01-01), Weaver
patent: 4467281 (1984-08-01), Davis et al.
patent: 4519066 (1985-05-01), Barrett, Jr. et al.
Cook, II James C.
Eccleston Larry
Goodrich, II Earl R.
Progressive Dynamics, Inc.
Strecker Gerard R.
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