Patent ID: 8760027

Claim:
A stator, comprising: an annular core-back portion; a plurality of teeth portions extending radially from a circumferential surface of the core-back portion; a plurality of insulators respectively mounted to the teeth portions; and a plurality of coils respectively mounted to the insulators; wherein each of the teeth portions includes a tip end and a base end, the tip end having a circumferential width equal to or smaller than a circumferential width of the base end and the tip end having an axial width equal to or smaller than an axial width of the base end; each of the insulators includes a tube portion arranged to accommodate each of the teeth portions, the tube portion including a first opening existing at the tip end of each of the teeth portions and a second opening existing at the base end of each of the teeth portions; and the first opening has an axial width smaller than an axial width of the second opening in a state that each of the insulators is removed from each of the teeth portions.