Patent ID: 7049718

Claim:
An external rotor motor ( 12 ), comprising an internal stator ( 52 ); a stationary support part ( 18 ) supporting the stator; an external rotor ( 49 ), cooperating with the internal stator ( 52 ), and journaled 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 control magnet ( 60 ), secured to the casing part ( 14 ), at least one galvanomagnetic rotor position sensor ( 62 ) associated therewith, in order to sense the rotational position of the casing part ( 14 ) relative to the support part ( 18 ); and a nonmagnetic spacer ( 58 ) arranged between the control magnet ( 60 ) and the permanent-magnet arrangement ( 50 ) of the external rotor ( 49 ).