| 摘要 |
A fan has a fan housing ( 2 ) which is formed with a pot-shaped recess ( 4 ) and it has an external-rotor drive motor ( 103 ) having an internal stator ( 22 ) and an external rotor ( 34 ), separated from each other by an air gap ( 52 ). The internal stator ( 22 ) is mounted on a bearing support tube ( 24 ) which is connected to a base part ( 46 ). The arrangement of bearing support tube ( 24 ) and base part ( 46 ) form, together with the pot-shaped recess portion ( 4 ) of fan housing ( 2 ), a substantially fluid-tight annular space ( 54 ) enclosing the inner stator ( 22 ). A wall ( 56 ) defining this annular space ( 54 ) extends in the manner of a canned motor through the air gap ( 52 ) between inner stator ( 22 ) and external rotor ( 34 ).
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