US 12,640,294 B2 · Method for producing laminates suitable for magnetic cores

Abstract

An oriented magnetic core lamination technique and a method of producing circular lamination cores. The method includes cutting rectangular strips with teeth pointing in a single direction (may not be the traverse or rolling direction) from the steel sheet plane, as opposed to directly punching circular laminates from the steel sheet with the teeth pointing in all directions. The strips are cut in such a way that the short side is aligned to the direction that has the best magnetic properties. The strips can then be bent into a donut or toroidal shape, either inwardly (with teeth pointing to the circle center) or outwardly (with teeth pointing out of the center) depending on the design of the lamination core. The direction with the best magnetic properties may be determined by non-destructive methods such as magnetic Barkhausen noise (MBN) analysis, x-ray diffraction (XRD), or electron backscatter diffraction (EBSD).

Claims18

Dependent claims

A method for producing laminates suitable for magnetic cores, said laminates being produced from steel sheets, the method comprising:

a) determining a preferred crystal direction on said steel sheets;
b) cutting strips from said steel sheets, said strips being suitable for manufacture of laminates having teeth such that said teeth are aligned in said preferred crystal direction;
c) executing steps d1)-d3) or steps e1)-e2);
wherein the steps d1)-d3) comprise:
d1) removing an excess material from said strips;
d2) forming a toroidal shape from said strips by bending said strips and joining ends of said strips to one another wherein the excess material removed in step d1) facilitates said bending;
d3) removing a further material from said toroidal shape to form the teeth, thereby resulting in said laminates having teeth;
and wherein the steps e1)-e2) comprise:
e1) removing a material from said strips to form teeth;
and
e2) bending said strips into said toroidal shape and joining ends of said strips to one another to thereby result in said laminates having teeth.

8 more elements

Dependencies are inferred from the claim text.

Method for producing laminates suitable for magnetic cores

Life of this patent

Method for producing laminates suitable for magnetic cores

Life of this patent

Abstract

Claims18