Metal working – Method of mechanical manufacture – Electrical device making
Patent
1986-03-13
1988-05-03
Kozma, Thomas J.
Metal working
Method of mechanical manufacture
Electrical device making
29609, 336213, 336217, H01F 4102, H01F 2724
Patent
active
047410965
ABSTRACT:
A transformer core is made by winding a strip of ferromagnetic material, such as amorphous metal or silicon iron, on a winding mandrel to form a first annulus and cutting once through this annulus to create a plurality of individual laminations which are then assembled in packets about a nesting mandrel of a smaller diameter than the winding mandrel to form a second annulus. Each packet consist of a predetermined number of groups of laminations, with the ends of each lamination group lapping each other to form a lap joint. The lap joints of each packet are arranged in staggered positions to create a repeating step-lap joint pattern confined within a predetermined joint region. By decreasing the lap joint dimension and increasing the number of groups in successively assembled packets, the increase in build of the joint region over that of the remainder of the second annulus is minimized. The completed transformer core uniquely characterized by its variable lap joint dimension and the absence of short sheets.
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Ballard Donald E.
Lee Albert C.
Cahill R. A.
Freedman W.
General Electric Company
Kozma Thomas J.
Policinski H. J.
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