Abstract: A method for improving the magnetic properties of a core fabricated from at least one strip of amorphous metal wound about itself to form adjacent laminations in the shape or a closed loop is disclosed. In accordance with the method, a force in tension of predetermined strength is applied to the loop from the innermost lamination of the loop outwardly. While this tensile force is being applied, the loop is annealed simultaneously and subjected to a magnetic field of predetermined strength.

Abstract: A plurality of separate blanks or punchings can be continually processed by first cutting the strips into the dimensions needed for core punchings prior to thermal and magnetic annealing. Thereafter the cut punchings can be fed into the annealing line a conveyor in the sequence of one after another in series, alternatively side-by-side in parallel. The punchings will be flattened with rollers or a press during the stage of heating from room temperature to approximately 300.degree. C. The molten metals adhering to the laser-cut edges or burrs from the mechanical shear can be mechanically removed at this point by brushing. The strips may then be thermally and magnetically annealed in the soaking area. In one embodiment, the temperature may be 400.degree. C. .+-.20.degree. C. for 2605-S2 Metglas material and 360.degree. C. .+-.10.degree. C. for 2605S-C Metglas material with a field of 10 Oe in a non-oxidizing environment.

Abstract: A method of constructing a magnetic core from groups of amorphous metal laminations, with the groups being defined by flattening sheets which are interspersed in a stack of amorphous laminations during a magnetic stress-relief anneal cycle. The stack of laminations is compressed with a pressure of at least about 4 psi, but not enough pressure to metallurgically bond adjacent laminations. The compression step is applied to the stack of laminations at least during the time the stack is at the elevated soaking temperature of the stress-relief anneal cycle. The flattened laminations are used to construct a magnetic core having an improved space factor and reduced sensitivity to core clamping pressures.

Abstract: A method for treating cast amorphous metal strip material. The method comprises heating a cast amorphous metal strip to a temperature of approximately 250.degree. in a non-oxidizing atmosphere, thereafter removing the cast amorphous strip from that atmosphere, and applying a tensile force to the strip material to eliminate elastic buckling therefrom.

Abstract: An electrical inductive apparatus such as a transformer including a magnetic core and an associated electrical coil is disclosed herein along with various methods of assembling the coil around the core. In each of the various embodiments disclosed, the core itself is one which is initially formed from a continuous strip or strips of amorphous material formed to provide a closed loop which is thereafter annealed but before its coil is assembled thereto. Various techniques are disclosed for winding the coil around a corresponding section of the core.

Abstract: A magnetic core including a plurality of layers of laminations formed from a magnetic strip material wherein at least two side leg and two yoke laminations are assembled around a core window to form four outer corners. Each of the side leg and yoke laminations have had one end thereof sheared diagonally with respect to the longitudinal dimension of the strip material. The other half of this one end is sheared substantially perpendicular to the strip material's longitudinal dimension. In each layer, the ends of the side leg and yoke laminations form two joints that are half straight and half diagonal. The ends of the side leg and yoke laminations in each layer form a step pattern about the outer corners of the core with the joints between the side leg and yoke laminations in one layer overlapping the joints between the side leg and yoke laminations in the next adjacent layer. A series of lap joints is thus formed in step relation.

Abstract: An electrical transformer having an electrical winding and a magnetic core having two parallel magnetic circuits having unequal mean lengths. The shorter of the parallel magnetic circuits is constructed of a magnetic material which exhibits a lower loss characteristic than the magnetic material used in the longer of the parallel magnetic circuits, at like levels of induction.