Process for fabricating transformer cores from amorphous magnetic allo - uses reels of alloy ribbon in continuous winding process followed by mechanical deformation at high temps. to give cores rectangular shape

摘要

Several reels of amorphous magnetic alloy ribbon are arranged, in circular symmetry about an axially mounted circular insulating transfer core former which can rotate on an axis with respect to the stationary reels. Three or more such transformer core-winding assemblies can be mounted on the same axis. The core is built up in successive layers in the rotation process. After winding, the circular core can be mounted on a rectangular framework consisting of four rectangular plates separated by threaded rods. The plates can be set in a rigid rectangle bearing against points on the internal surface of this core and putting it in tension against points on the internal surface of the core and putting it in tension. During controlled heat treatments at between 350 degrees C. and 410 degrees C. the core can be forced into a rectangular shape by the tension in the framework. Bobbins are wound on the core and fields of 10 to 20 Oersteds are created to establish the required magnetic orientation in the core material whilst the cores are again held at an elevated temperature.