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3.3.2
Cooling and ventilation
The machines of this series are three-phase induction machines with a closed primary
(internal) cooling circuit and an open secondary cooling circuit (surface cooling). The surface
cooling varies depending on the version.
3.3.2.1
Machines with a fan
Self-ventilation (standard): Cooling method IC 411 according to EN / IEC 60034-6
Located at the ND end of the stator housing is an air intake cowl that guides the external air
on its way to the motor. The external air is drawn in through openings in the air intake cowl
and flows axially across the outer cooling ribs of the motor frame. The fan wheel for the
external flow of cooling air is attached to the machine shaft.
The fan wheels are bidirectional.
Check the cooling effect below rated speed in the case of frequent switching or braking – or
if the speed is controlled continually below the rated speed.
Forced ventilation (optional): Type of cooling IC 416 in accordance with EN / IEC 60034-6
Cooling that does not depend on the speed is achieved by means of a unit that is
independent of the motor operating state (forced ventilation). This unit is closed to the
outside by a fan cover. It has its own main drive with fan impeller which creates the cooling
air flow required for cooling the motor.
3.3.2.2
Machines without a fan (optional)
Cooling method IC 410
Surface cooling by free convection: Cooling method IC 410 according to EN / IEC 60034-6
Cooling method IC 418
Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
1MB1.33 Eagle Line shaft heights 71 ... 315
Operating Instructions, 08/2023, A5E52990459A
Description
3.3 Installation
33
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