Patent ID: 9397527
Filing Date: 2016-07-19
CPC Classification: H02K

Claim Text:
1. A stator unit comprising: a plurality of teeth extending in a radial direction with respect to a central axis; an insulator that covers each of the plurality of teeth; and a coil that is defined by a conducting wire wound around the insulator; wherein when m is set to be an integer equal to 2 or more and n is set to be an integer larger than m+1, the coil includes: a first layer defined by a first turn to an m-th turn; and a second layer defined by an m+1-th turn to an n-th turn; a first turn to the m-th turn are sequentially wound around the insulator toward inside in the radial direction from outside in the radial direction; the m+1-th turn to the n-th turn are sequentially wound toward the outside in the radial direction from the inside in the radial direction; a distance between an m−1-th turn and the m-th turn is wider than each distance in the first turn to the m−1-th turn; the m+1-th turn is disposed between the m−1-th turn and the m-th turn; in a cross-section perpendicular or substantially perpendicular to the central axis and passing through the tooth, an angle between a line segment connecting respective centers of the m+1-th turn and the m−1-th turn and a line segment connecting respective centers of the m+1-th turn and the m-th turn is more than or equal to about 120° and less than about 180°; and a space is provided between the m+1-th turn and the insulator.