Patent ID: 7548003

Claim:
An external rotor motor ( 12 ), comprising an internal stator ( 52 ); a stationary support part ( 18 ) supporting the stator; and an external rotor ( 49 ), cooperating with the internal stator ( 52 ), and mounted on bearings for rotation with respect to the stator, said rotor having a casing part ( 14 ) on whose inner side ( 28 ) is arranged a permanent-magnet arrangement ( 50 ) that coacts with the internal stator ( 52 ), a first side of said casing part ( 14 ) being supported by means of a first rolling bearing ( 24 ) on said stationary support part ( 18 ), said first bearing having an outer race ( 26 ) slidably arranged adjacent an inner surface ( 28 ) of said casing part ( 14 ) and having an inner race ( 38 ) fixed to said stationary support part ( 18 ); a second side of said casing part ( 14 ) being supported by means of a second rolling bearing ( 40 ) on said stationary support part ( 18 ), said second bearing having an outer race ( 42 ) nonslidably secured adjacent the inner surface ( 28 ) of said casing part ( 14 ) and having an inner race ( 38 ) fixed to said stationary support part ( 18 ); and wherein the outside diameter of the outer race ( 26 ) of said first rolling bearing is dimensioned such that the stationary support part ( 18 ), along with said internal stator ( 52 ) and said first rolling bearing ( 24 ) mounted thereon, fits into said casing part ( 14 ) for purposes of assembling said motor.