Patent ID: 6060978
Filing Date: 2000-05-09
Classification: H01F

Abstract:
A magnetic assembly, comprising:a first series of substantially identical laminations, each made up of a thin sheet of ferrous material, and abutted against one another in aligned relation;the laminations of said first series including a first open area flanked by spaced, opposed, first surfaces;first stake locks holding said first series in assembled relation;a second series of substantially identical laminations, each made up of a thin sheet of ferrous material and abutted against one another in aligned relation;second stake locks holding said second series in assembled relation;the laminations of said second series being configured to be assembled to the laminations of said first series and defined therewith a closed loop of said ferrous material;the laminations of said second series having spaced, oppositely directed second surfaces configured to be complementary to a corresponding one of said first surfaces and abutting the same;the distance between one of said first and second surfaces, before assembly of said first series and said second series, being slightly less than the distance between the other of said first and second surfaces so that, upon assembly of said first series to one another and said second series, an interference fit exists between said first and second series at said first and second surfaces to hold said first and second series in assembled relation;a third series of substantially identical laminations, each made up of a thin sheet of ferrous material, and abutted against one another in aligned relation;the laminations of said third series including a second open area flanked by spaced, opposed, third surfaces;a fourth series of substantially identical laminations, each made up of a thin sheet of ferrous material and abutted against one another in aligned relation;the laminations of said fourth series being configured to be assembled to the laminations of said third series and define therewith a closed loop of said ferrous material;the laminations of said fourth series having spaced oppositely directed fourth surfaces configured to be complementary to a corresponding one of said third surfaces and abutting the same;a distance between one of said third and fourth surfaces, before assembly of said third series and said fourth series, being slightly less than a distance between the other of said third and fourth surfaces so that, upon assembly of said third series and said fourth series to one another, an interference fit exists between said third and fourth series at said third and fourth surfaces to hold said third and fourth series in assembled relation;means holding the laminations of said third series in abutting relation;means holding the laminations of said fourth series in abutting relation;the laminations of said third series having a different configuration than the laminations of said first series;the laminations of said second series having a different configuration than the laminations of said fourth series; andmeans assembling the assembled first and second series to the assembled third and fourth series with said first and second open areas aligned;said electrical winding at least partially occupying both said open areas;whereby said magnetic assembly comprises two closed loops off errous material, each of two series of laminations, with the laminations of one loop overlapping the laminations of the other loop to achieve a desired magnetic efficiency.