| 摘要 |
An improved fan useful for ventilating applications in motor vehicles features a modular structure, which facilitates quick replacement of any components likely to fail. A first module ( 110 ) is intended for permanent installation on the part that is to be cooled. A second module ( 110 ) is configured for quick engagement to and disengagement from the first module. The second module preferably comprises a hub ( 22; 362 ), an internal stator ( 60; 332 ) mounted on the hub, and one or more struts ( 74; 344 ) connecting the hub to a cylindrical casing part ( 76; 336 ) which surrounds but is spaced from the outside of the fan wheel ( 46; 348 ). The struts form a lattice ( 112 ) which can be easily grasped for swapping out the second module when repair or replacement becomes necessary. The fan has a Hall sensor ( 50 ) and a control circuit ( 156 ) which regulates fan speed according to PWM (Pulse Width Modulation) or DC voltage signals ( 164 ) supplied from outside and has means ( 186; 244 ) for generating a fault signal in the event of a fault state, and for sending the fault signal out on a control line ( 90 ).
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