Patent ID: 6070317
Filing Date: 2000-06-06
Classification: H01F,Y10T

Abstract:
The method of making a quiet transformer cores, comprising the steps of:forming a transformer core in a stack of laminations, each lamination formed of thin, flat, laser cut segments made of steel having extremely high grain orientation;coating each segment with a layered organic coating thereon to insulate one lamination from another to reduce losses from conductivity from lamination to lamination includingfiring on a first layer by an oxidation process during heat treating of said steel andapplying a second layer of a glass-like material to stiffen the exterior surface of said steel and to lock the grains on the surface of said steel into position to minimize the effects of bending or sharp cutting said steel;controlling magnetostriction of said core by applying pressure to said stack;forming each lamination of said core with long gap joints between said segments; andforming said stack by 100% interleaving each lamination.