The external rotor concept differs from the conventional motor in that the rotor has been moved to the outside of the motor and the stator with the winding is situated on the inside. This arrangement allows direct cooling of the rotor as well as good stability, excellent speed control and greater inertia.

 

Centrifugal fans with backward curved blades
RB series

 


 

Centrifugal fans with forward curved blades
Single inlet - RF series

 


 

Centrifugal fans with forward curved blades
Double inlet - RF series

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