Patent ID: 8726490
Filing Date: 2014-05-20
Classification: H02K,Y10T

Abstract:
1. A method of constructing a core with tapered pole pieces, comprising: winding an iron-based amorphous magnetic alloy ribbon concentrically to form a cylinder-shaped toroidal core, said core having an outside diameter, an inside diameter, a first flat side, a second flat side, an outer circumference and an inner circumference; heat-treating said cylinder-shaped toroidal core, with or without a magnetic field, at a temperature that is below a crystallization temperature of said ribbon to form a heat-treated core; impregnating said heat-treated core with a resin to form an impregnated core; machining said first flat side of said impregnated core to form a tapered surface so that said outer circumference is being machined to be shorter than said inner circumference, and said tapered surface is at a taper angle that is measured with respect to said first flat side; and machining said tapered surface to form a plurality of pole pieces, each of said plurality of pole pieces having a height that is measured on said inner circumference, an outer side diameter, and an inner side diameter, each of said plurality of pole pieces being separated in an alternating manner by a plurality of slots, and each of said plurality of slots having a slot width and a slot depth.