Patent ID: 7051770

Claim:
A coil-winding method for forming a wire-wound coil unit, comprising the steps of: winding a first wire and a second wire simultaneously around a first layer position of a core so as to form a first turn, the first wire and the second wire being substantially parallel to each other; winding the first wire and the second wire simultaneously around the core to form a second turn, the first wire of the second turn being adjacent to the first turn, the first wire of the second turn being disposed on a section between the first wire and the second wire of the first turn in the first layer of the core such that the first wire of the second turn is disposed in a second layer of the core, the second wire of the second turn being wound directly around the core such that the second wire of the second turn is disposed in the first layer of the core; and winding the first wire and the second wire simultaneously around the core to form a third turn, the first wire of the third turn being disposed in the second layer and wound around a section between the second wire of the first turn and the second wire of the second turn in the first layer, the second wire of the third turn being wound directly around the core such that the second wire of the third turn is disposed in the first layer of the core.