Centrifugal blowers and fans Axial fans

Technical introduction - EC
The external-rotor motor as EC motor,
illustrated on a backward curved centrifugal fan
Section of a centrifugal fan
Impeller flange
Integrated electronics
Stator winding
Stator sleeve with bearings
Stator lamination
Rotor with magnet
Impeller
The EC external-rotor motor is very compact
because of its integrated bearing system. This
motor installed inside the impeller results in a
very low-profile ventilation unit.
All rotating parts are directly fitted to one component
and dynamically balanced as such. This
guarantees low loads on the bearing system.
There is optimum heat transfer out of the motor
because of its exposure to the air flow inside
the impeller. This contributes to long motor life.
The electronics can be either integrated onto a
PCB inside the motor or can be ordered as
separate unit.
16