Patent ID: 9076580
Filing Date: 2015-07-07
Classification: H01F,H02J

Abstract:
1. A coil for forming an induced magnetic field, comprising: a first coil bundle formed of a first conducting wire wound in a first direction, the first coil bundle having an inner space of a prescribed inner width; a second coil bundle formed of a second conducting wire wound in a second direction, the second coil bundle having a prescribed outer width that is smaller than the inner width of the first coil bundle; a third coil bundle formed of a third conducting wire, wherein the third conducting wire of the third coil bundle is wound in the same direction as first conducting wire of the first coil bundle and in an opposite direction as the second conducting wire of the second coil bundle; and a connector that electrically connects the first conducting wire, the second conducting wire and the third conducting wire to each other, wherein the second coil bundle is provided in the inner space of the first coil bundle and the third coil bundle is provided in an inner space formed in the second coil bundle, wherein a first prescribed gap is provided between an inner surface of the first coil bundle and an outer surface of the second coil bundle, and a second prescribed gap is provided between an inner surface of the second coil bundle and an outer surface of the third coil bundle, and wherein a size of the first prescribed gap is proportional to a number of turns of the first and second coil bundles, and a size of the second prescribed gap is proportional to a number of turns of the second and third coil bundles.