Patent ID: 6703738
Filing Date: 2004-03-09
Classification: H02K

Abstract:
An outer rotor type brushless motor comprising an outer rotor having permanent magnets fixed onto an inner periphery of a cup-like rotor yoke, a stator including a stator core having a plural of magnetic pole portions protruded on an outer periphery of an annular portion of said stator core and faced to said permanent magnets and coils wound on said magnetic pole portions, respectively, a cylindrical boss disposed on an inner periphery of said annular portion of said stator core, a rotational shaft extending along an axis of said boss and rotationally supported on said boss by a bearing with a leading end of said shaft having a center portion of said rotor yoke fixed thereto and a mounting plate fixed onto an outer periphery of said boss, said boss being formed of resin mold, an annular rising portion being formed on the side of an inner peripheral portion of said mounting plate so as to form at the top of said rising portions a face parallel to the face of said inner peripheral portion, said annular rising portion being integrally inserted into said boss so as to be fixed thereto when said boss is molded and said annular portion of said stator core being mounted on and fixed directly to said face at the top of said rising portion by screw.