Abstract: Electrical apparatus includes electrical coil means formed of multiple turns of enamel-covered electrical wire axially mounted on a core of magnetic material in electromagnetic energy coupling relationship therewith, and a relatively flat flexible electrical cable containing a plurality of spaced parallel conductors extending between the cable ends contains a loop shaped portion extending about an axis of said core over an arcuate distance greater than 180 degrees.

Abstract: An improved inductive device such as a transformer of the type containing a closed magnetic core, typically formed of magnetic laminations, with at least one coil-receiving core window and an electrical coil winding mounted on a core leg fitting through the core window, said coil being of a multilayer precision wound bobbinless construction in which the coil side to which a winding start lead extends faces an adjacent core leg, the improvement therein wherein the first turn of the first layer of the coil winding is interleaved between two turns of an overlying layer of winding turns and wherein the last turn of said first layer is also interleaved between two other turns of said overlying layer, whereby the spacing between the coil and magnetic iron core elements is increased to enhance electrical insulation.

Abstract: Electrical apparatus includes electrical coil means formed of multiple turns of enamel-covered electrical wire axially mounted on a core of magnetic material in electromagnetic energy coupling relationship therewith, and a relatively flat flexible electrical cable containing a plurality of spaced parallel conductors extending between the cable ends contains a loop shaped portion extending about an axis of said core over an arcuate distance greater than 180 degrees.