公开(公告)号：WO1987003738A1

公开(公告)日：1987-06-18

申请号：PCT/US1986002570

申请日：1986-12-02

Applicant: GENERAL ELECTRIC COMPANY

Inventor： GENERAL ELECTRIC COMPANY ,  BALLARD, Donald, Emerson ,  KLAPPER, Willi

IPC: H01F27/26

CPC classification number: H01F27/25 ,  H01F41/0226 ,  Y10T29/49073 ,  Y10T29/49078

Abstract: A first annular form (4) used for making a transformer core is wound from a strip of amorphous ferromagnetic material and is thereafter cut. The resulting laminations are then arranged in a second annular form (10) with distributed gap joints in region (17), each joint involving a plurality of superposed lamination. The second annular form (10) is then formed into a rectangular shape core and is then annealed. Then a bonding agent (26) is applied to the transverse edges of the laminations over a region of the core removed from the joints. The joints are then separated to open the core, allowing displacement of unbonded regions of the core. Thereafter, preformed coil structure (28) is inserted into the window of said open core to surround a portion of the core. Then the unbonded regions of the core are returned to their original positions to remake the joints.