Apparatus for providing regulated direct current to magnetizing

Details Apparatus for providing regulated direct current to magnetizing Apparatus for providing regulated direct current to magnetizing

1975-12-08

1977-12-06

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

323 435R, 323 57, 324225, 361146, 324238, G05F 164

Patent

active

040619605

ABSTRACT:
An apparatus for providing regulated direct current to magnetizing coils of a non-destructive magnetic testing apparatus for detecting welding defects in pipe, which includes a variable output auto-transformer, a rectifying and filtering circuit, a meter relay for detecting direct current output magnitudes from the rectifying circuit at upper and lower bounds of a predetermined range required for proper operation of the testing apparatus, and a synchronous motor for adjusting the output of the variable transformer, in response to a control signal from the meter relay, until the direct current magnitude is within the predetermined range.

REFERENCES:
patent: 3011095 (1961-11-01), Kriechbaum
patent: 3039252 (1962-01-01), Guldemond et al.
patent: 3235788 (1966-02-01), Riebs
patent: 3345557 (1967-10-01), Perrins
patent: 3588684 (1971-06-01), Ridgeway
patent: 3753085 (1973-08-01), Morton et al.
patent: 3913007 (1975-10-01), Gilmore

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