Patent ID: 8058766
Filing Date: 2011-11-15
Classification: H02K

Abstract:
1. A rotational motor comprising: A stator formed by a core member including a magnetic core portion extending in a radial direction of the rotational motor and formed into a fixed shape in every cross section thereof extending orthogonally relative to the radial direction, a coil wound around the magnetic core portion to form a plurality of layers and having a less winding number thereof at an uppermost layer winding portion of the plurality of layers than a winding number at a second layer winding portion provided at a lower side of the uppermost layer winding portion, and an engagement member provided at an outer side of the magnetic core portion in the radial direction and engaging with an end portion of the coil, wherein a gap is generated between windings of the coil at a predetermined position when the uppermost layer winding portion of the coil is wound in series with the second layer winding portion from an outer side to an inner side of the uppermost layer winding portion in the radial direction, and wherein the coil is wound to fill the gap when a winding position of the coil is returned from an innermost side to the outer side of the uppermost layer winding portion in the radial direction.