Patent ID: 8008820
Filing Date: 2011-08-30
Classification: H02K

Abstract:
1. An inner-rotor-type motor comprising: a housing including a compartment; a stator received in the compartment, with an assembling hole arranged at an axial center of the stator and passing through the stator from a top to a bottom of the stator; a rotor including a shaft with one end thereof rotatably extending through the assembling hole of the stator, with at least one bearing being mounted around the shaft, wherein the at least one bearing is a ball bearing including an inner ring, an outer ring, two lateral covers respectively coupled with the inner and outer rings to form a compartment, and a plurality of balls sandwiched between the inner ring and the outer ring and received in the compartment, with a gap defined between the inner and outer ring; a permanent magnet fixed to an outer periphery of the shaft and beside the bearing, with the permanent magnet facing the stator; and at least one cover plate arranged between the permanent magnet and the at least one bearing, wherein the at least one cover plate extends over a center point of the gap defined between the inner and outer rings.