Patent ID: 8561481
Filing Date: 2013-10-22
Classification: G01L

Abstract:
1. A stator assembly comprising: a stator holder; a first stator which includes a first body having a ring shape and a plurality of first teeth bent from an inner circumferential surface of the first body and spaced apart from each other, wherein the plurality of first teeth are coupled to an upper portion of the stator holder; a second stator which includes a second body having a ring shape and a plurality of second teeth bent from an inner circumferential surface of the second body and spaced apart from each other, wherein the plurality of second teeth are coupled to a lower portion of the stator holder, wherein the plurality of first teeth are alternately aligned with the plurality of second teeth; a plurality of protrusions making contact with both side surface of each of the plurality of first teeth, wherein the plurality of protrusions covers at least a portion of each of the plurality of first teeth.