Patent ID: 7741750

Claim:
Apparatus, comprising: a stator defining a stator bore, the stator comprising a stator yoke having a stator yoke thickness, and a plurality of stator teeth, the teeth having a common length, with each of the stator teeth including a stator tooth center portion that extends from a stator tooth bottom portion proximal the yoke to a stator tooth tip portion, with adjacent stator teeth defining a stator slot between them, each stator slot having a stator slot bottom that extends along a stator slot bottom length, wherein the center portion has a stator tooth width that is less than or equal to one half the stator slot bottom length, the stator tooth width also being smaller than a stator slot opening width distance between adjacent stator tooth center portions, wherein a ratio of stator yoke thickness to stator tooth width is at least 5:1; and a rotor mounted in the bore to rotate.