Patent ID: 7091639

Claim:
An external rotor motor, comprising: an inner stator ( 22 ) including a lamination stack ( 23 ) having a coating ( 76 ) at least partially covering it, said inner stator ( 22 ) being formed with an internal recess ( 36 ); an external rotor ( 42 ); a bearing support tube ( 38 ) having an inner side equipped with a bearing arrangement for journaling said external rotor, and having an outer side ( 98 ) to which said inner stator ( 22 ) is secured; an annular securing disk ( 20 ) made of a ferromagnetic material and secured in said coating ( 76 ) of said lamination stack ( 23 ), said disk being formed with projecting portions ( 34 ) extending radially inward, with respect to a central axis ( 101 ) of said bearing support tube ( 38 ) into said internal recess ( 36 ) of the inner stator ( 22 ), said projecting portions ( 34 ) having bent portions ( 34 ′) which engage as barbs into said outer side ( 98 ) of said bearing support tube ( 38 ), and tbereby prevent axial separation of said stator ( 22 ) from said bearing support tube ( 38 ); and wherein said beating support tube ( 38 ) has, on its exterior surface, a plurality of axially extending longitudinal guide grooves ( 102 ) into which said projecting portions ( 34 ) of said annular securing disk ( 20 ) engage, thereby defining and maintaining a predetermined angular orientation between said bearing support tube ( 38 ) and said stator ( 22 ).