Laser treatment of electrical steel
AssigneeArmco Inc.
InventorsGary L. Neiheisel, Jerry W. Schoen
Life of this patent
Estimating the term…
Abstract
A process is taught for improving the core loss of magnetic materials of the type having a plurality of magnetic domains and an insulative coating thereon. The insulative coating may be a mill glass, an applied coating, or both. The magnetic material is scanned by the beam of a laser across its rolling direction so as to subdivide the magnetic domains without damage to the insulative coating.
Claims26
A process for improving the core loss of magnetic materials of the type having a plurality of magnetic domains and an insulative coating thereon chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass, said process comprising the step of momentarily irradiating said magnetic materials having said insulative coating thereon with a continuous wave laser so as to subdivide said magnetic domains without damage to said insulative coating.
A magnetic material having a plurality of spaced parallel continuous wave laser-refined magnetic domains serving to reduce core loss, said magnetic material having said laser-refined magnetic domains also having an uninterrupted insulative coating thereon, said coating having been formed on said magnetic material prior to said laser refinement of said magnetic domains and having been chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass.
Dependencies are inferred from the claim text.