PROCESS FOR PREPARING SURFACE-EXPANDED SPIRAL WIRE

摘要

The present invention relates to a method for manufacturing a surface-expanded helical wire and a surface-expanded helical wire manufactured by the method. According to the present invention, provided is a litz wire which is a copper wire twisting some strands of fine enamel coated wires in a certain pitch and is mainly used for a high frequency apparatus, to inhibit an increase of an AC impedance caused by a specific skin effect and a proximity effect of a high frequency, prevent an increase of the coil temperature by expanding the surface area, and enable an apparatus to have the high efficiency, small size, high energy, and high speed.