US 5,398,403 AGranted

Method of making a transformer core comprising groups of amorphous steel strips wrapped about the core window

AssigneeGeneral Electric Company

InventorDavid R. Freeman

Life of this patent

Estimating the term…

Loading patent…

Abstract

This is a method for making a transformer core comprising superposed groups of amorphous steel strip wrapped about the core window, each group comprising an inner section and an outer section disposed in superposed relationship, and each section comprising many thin layers of amorphous steel strip. Each of the layers in a section has a length dimension measured between the transversely-extending edges of the layer located at opposite ends of the section. The layers in the inner section of a group have substantially equal lengths, and the layers in the outer section of said group have substantially equal lengths of a greater value than the lengths of the layers in the inner section. When the groups are wrapped about the core window, the following relationships are present. At one end of each group the transversely-extending edges of all the layers in said group are substantially aligned to form a smooth edge. At the other end of the group (i) the transversely-extending edges of the layers in the inner section are disposed to form a beveled edge for the inner section, (ii) the transversely-extending edges of the layers in the outer section are disposed to form a beveled edge for the outer section, and (iii) the beveled edge of the outer section overlaps the beveled edge of the inner section.

Claims5

Dependent claims

A method of making a transformer core comprising a window and superposed groups of amorphous steel strip wrapped about the window, each group comprising an inner section and an outer section disposed in superposed relationship, and each section comprising many thin layers of superposed amorphous steel strip, said method comprising:

(a) providing composite amorphous steel strip comprising many thin layers of amorphous steel strip,
(b) cutting said composite strip to detach therefrom a first multi-layer section of predetermined length,
(c) cutting said composite strip again to detach therefrom a second multi-layer section of substantially greater length than said predetermined length,
(d) stacking the two sections together (i) with their edges at one end of the two sections in substantial alignment to form a group having a relatively smooth edge at said one end and (ii) with the edges within each section substantially aligned at the other end of the two sections but with the edges of one section staggered with respect to the edges of the other section,
(e) wrapping said group about an arbor while maintaining the smooth-edge configuration at one end of said group and with the longer section located radially outward of the other section, thereby developing a beveled edge on each of the two sections, with the beveled edge on the outer section overlapping the beveled edge on the inner section.

2 more elements

Dependencies are inferred from the claim text.