Patent ID: 8310116
Filing Date: 2012-11-13
Classification: H02K,Y10T

Abstract:
1. A brushless motor comprising: a rotatable shaft; a rotor that is supported by the rotatable shaft to rotate integrally with the rotatable shaft; a centerpiece that includes a tubular support portion, which rotatably supports the rotatable shaft, and a plurality of outer protrusions, which radially outwardly protrude from the tubular support portion and are circumferentially arranged one after another; a stator that is located radially outward of the tubular support portion and is configured into an annular form, wherein the stator includes a plurality of primary protrusions, each of which radially inwardly protrudes from an inner peripheral portion of the stator in a radial direction of the stator and is placed at a circumferential center location between corresponding circumferentially adjacent two of the plurality of outer protrusions of the centerpiece in a circumferential direction of the stator; and a plurality of vibration dampers, each of which is radially placed between the stator and the tubular support portion of the centerpiece in the radial direction of the stator and is circumferentially placed between corresponding two of the plurality of outer protrusions of the centerpiece in the circumferential direction of the stator, wherein each of the plurality of vibration dampers is made of an elastomer material and includes: