Rolling Bearings - Siemens SIMOTICS XP 1MB5 Operating Instructions Manual

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.
For two pole motors, the fan impellers are unidirectional.
Surface cooling by relative movement of cooling air (option): Cooling method IC 418 according
to EN / IEC 60034-6
Enclosed machine, no fan, enclosure surface is cooled using an external cooling air flow. The
required air flow is available on request.
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

Rolling bearings

Rolling bearings are used to support the machine shaft and maintain its position in the fixed part
of the machine. One rolling bearing performs the function of a location bearing that transfers
axial and radial forces from the rotating machine shaft to the non-moving part of the machine.
The second rolling bearing is implemented as floating and support bearing in order to allow
thermal expansion inside the machine and transfer radial forces.
1MB5 shaft height 400/450
Operating Instructions, 04/2023, A5E52802354A
Description
3.3 Structure
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