Magnetizing current supply for magnetic particle inspection with

Details Magnetizing current supply for magnetic particle inspection with Magnetizing current supply for magnetic particle inspection with

1981-05-07

1984-04-17

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

324228, 363 87, 363129, G01N 2782, H02P 1324, H02M 7155

Patent

active

044437595

ABSTRACT:
Magnetizing current supplies are disclosed for supplying current for magnetizing parts in a magnetic particle inspection system, including SCR's connected in circuit with a three-phase voltage step-down transformer to accurately control the duration and magnitude of magnetizing current. In one type of supply, six SCR's are connected between magnetizing apparatus and terminals of three center tapped secondary windings of a three-phase voltage step-down transformer, the SCR's being operable to rectify current and also being connected to a phase control circuit which controls firing times of all SCR's to control the magnitude of the magnetizing current.

REFERENCES:
patent: 3134068 (1964-05-01), Feltman
patent: 3519913 (1970-07-01), Janecek
patent: 3611097 (1971-10-01), Joslyn
patent: 3825812 (1974-07-01), DeBuhr
patent: 4282569 (1981-08-01), Hardwick et al.
patent: 4348718 (1982-09-01), Vollrath
patent: 4351022 (1982-09-01), Dolland et al.

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