Bearings - Siemens SIMOTICS-T 1FW68 Engineering Manual

Motor components and options
4.1 Motor components
● The closed-loop speed and position control requires that the encoder is integrated into
the mechanical structure with the highest possible stiffness and lowest possible vibration.
● Using the encoder as an angle measuring system for the machine precision requires that
the encoder is connected as close as possible to the process
In addition to selecting a suitable encoder, the performance of the machine axis is essentially
determined by the integration into the overall mechanical system.
As a consequence, a general recommendation for integrating the encoder cannot be given
for all encoder types.
To ensure that the encoder is optimally integrated into the mechanical system, Siemens
offers its Mechatronic Support service. For additional information, contact your local Siemens
office. You can find the "Technical Support" Internet link in Chapter "Introduction".
4.1.4

Bearings

Selecting the bearing
Segment motors are built-in motors for directly driven rotary or swivel axes. To set up a
complete drive unit, a bearing between the stator and rotor is required in addition to the
phase-angle encoder system.
Your choice of bearing is governed by the following factors:
● Geometric requirements (internal and external diameter)
● Speed
● Load (magnitude, direction)
● Rigidity (accuracy, pretension)
● Service life
The bearing is not included in the scope of delivery.
Bearing currents and static charging of the rotor
Depending on the design and properties of the bearing, the rotor may become statically
charged.
• Apply the corresponding remedial measures, e.g. insulated bearings or the appropriate
Note
Radial forces are generated between the stator and rotor. These must be taken into account
when you select the bearing, see also Chapter "Mounting".
74
WARNING
grounding.
1FW68 radial segment motors
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1