Patent ID: 7843306

Claim:
A transformer core comprising: a first pair of planar sub-parts ( 27 , 28 ) of magnetically permeable material that are joined together to form a rectangular core lamination ( 25 ) with a central rectangular opening ( 26 ) having four interior walls, one of said first pair of planar sub-parts ( 27 ) being C-shaped and forming an entirety of three of the four interior walls (a, b, c) of the central rectangular opening, said one sub-part having two contact faces ( 32 , 33 ) that contact the other of said pair of planar sub-parts, said contact faces extending obliquely relative to a centerline of said core lamination from two respective corners of the central rectangular opening to respective opposite peripheral side walls ( 35 , 36 ) of said core lamination, the other of said pair of planar sub-parts ( 28 ) forming the entire remaining one of the interior walls (d) of the central rectangular opening and having two contact faces ( 32 a , 33 a ) that contact respective said contact faces of said one sub-part ( 27 ), said contact faces of said other sub-part extending obliquely relative to a centerline of said core lamination from said two respective corners of the central rectangular opening to respective opposite peripheral side walls ( 35 , 36 ) of said core lamination; and a second pair of planar sub-parts ( 27 a , 28 a ) that are identical to said first pair of planar sub-parts and that are joined together to form a further said rectangular core lamination with a central rectangular opening, wherein said second pair of planar sub-parts are directly adjacent to said first pair of planar sub-parts with the central rectangular openings thereof in registration and said second pair of planar sub-parts rotated 180° relative to said first pair, and wherein a plurality of said adjacent first and second pairs of planar sub-parts are joined together to form said transformer core.