The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 05, 2002
Filed:
Nov. 13, 2000
Applicant:
Inventors:
Assignee:
ABB Inc., Raleigh, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 3/04 ;
U.S. Cl.
CPC ...
H01F 3/04 ;
Abstract
There is disclosed a method of making transformer core laminates with bent corners from magnetic strip material having a predetermined thickness and power loss in the manufacture of a low-stress polyhedral core for a power transformer. The method includes mechanically bending corners in each laminate about predetermined bending lines while limiting the zone in each corner where the laminate is subject to plastic deformation to <5 times laminate thickness so that the specific power loss in the transformer core will equal that of the magnetic strip material except within the distance from the bending lines, where the power loss is higher due to plastic deformation of the magnetic strip material.