Patent ID: 7830237
Filing Date: 2010-11-09
Classification: H01F

Abstract:
1. A transformer comprising: an iron core including a shaft; and a plurality of coil modules mounted around the shaft, wherein each of the plurality of coil modules being electrically conductive and having an insulating surface, wherein each of the plurality of coil modules including spiral, upper and lower coil sections and upper and lower ends electrically connected to each other via the spiral, upper and lower coil sections, wherein the spiral upper coil section including an upper, outer loop and a plurality of upper, inner loops received in and coplanar wherein the upper, outer loop and having diameters smaller than the upper, outer loop, wherein the spiral lower coil section including a lower, outer loop and a plurality of lower, inner loops received in and coplanar wherein the lower, outer loop and having diameters smaller than the lower, outer loop, wherein the plurality of upper, inner loops and the plurality of lower, inner loops including a common innermost loop, wherein the shaft of the iron core extending through the common innermost loop, wherein the upper end interconnected to the upper, outer loop, wherein the lower end interconnected to the lower, outer loop, wherein the spiral upper section superimposed on the spiral lower section to form a two-layer structure, wherein the lower end of an upper one of two adjacent coil modules interconnected to the upper end of a lower one of the two adjacent coil modules.