Patent ID: 7786840

Claim:
A stack of two or more windings within a magnetic circuit, wherein each winding is comprised of a multiple-turn coil having a start lead and a finish lead, the multiple-turn coil extending either outward or inward from a center region; wherein a first turn of the coil is connected to the start lead and has a smallest perimeter from the center region and at least one subsequent turn of the coil has a progressively greater perimeter, such that the start lead passes over or under adjacent larger turns of the coil to extend to the exterior perimeter of the winding, or the finish lead passes over or under adjacent larger turns of the coil to extend to the interior of the winding; wherein the location of an extension of either the start lead or the finish lead of each winding of the stack are varied along the perimeter with respect to each adjacent winding of the stack, and the multiple-turn coil is substantially planar or conical in shape.