Electrical discharge scribing for improving core loss of grain-o

Details Electrical discharge scribing for improving core loss of grain-o Electrical discharge scribing for improving core loss of grain-o

1987-05-08

1988-08-30

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, 219121R, H01F 104

Patent

active

047674695

ABSTRACT:
A method and apparatus are provided for domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip by contacting the insulated steel surface to be scribed with a discharge electrode, providing a high voltage-low current and low voltage-high current to the electrode, moving the electrode across the steel while essentially maintaining contact therewith, and marking the steel with a plurality of indentations generally aligned across the steel surface by pulsing the high current to produce a plurality of electrical discharges.

REFERENCES:
patent: 3990923 (1976-11-01), Takashina et al.
patent: 4652316 (1987-03-01), Beckley
"Further Prospects for Grain-Oriented Silicon Steels", J. A. Salsgiver, Journal of Metals, vol. 38, No. 1, Jan. 1986, pp. 27-31.

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