Patent ID: 7126451
Filing Date: 2006-10-24
Classification: H01F,Y10T

Abstract:
1. A process for the preparation of a coil for an electric appliance by winding an electric conductor having a rectangular cross section such that small sides of the cross section corresponds with the direction of the coil axis of the coil to helically superpose the conductor, comprising the steps of: providing electrically conductive plural strip-shaped coil fragments; butting ends of the coil fragments to each other and beam welding the ends to form plural one-turn coils having notches whose locations differs from one another, each of the one-turn coils having a ring-shape provided with a beginning end and a terminal end divided by the notch; and superposing the one-turn coils on one another while shifting the locations of the notches little by little in order so that the terminal and beginning ends of the one-turn coils adjacent to each other are in contact with each other to weld or braze the terminal and beginning ends, whereby the one-turn coils are spirally bonded.