• Complying with the maximum permissible speeds (refer to Chapter "Technical data and
characteristics")
• The bearing change intervals are reduced for unfavorable operating conditions, for example
– average speed > than the value specied in Table 4-16
– continuous operation at n
max
– Vibration and shock load
– Frequent reversing operation
Note
Replacing the motor bearings
When replacing the motor bearings, we also recommend that encoders with their own
bearings are also replaced.
The fatigue life and the grease consumption time are calculated, statistical values and
cannot be warranted.
Note
Axial bearing loads for vertical mounting
The increased axial loads imposed on the bearings on vertically mounted motors can
reduce the bearing lifetime by almost 50%. This applies to shaft heights 180 to 280 due
to the rotor weights.
Relubrication
In motors that can be relubricated, the bearing life can be extended by complying with xed
relubrication intervals.
Depending on the frame size, some restrictions have to be taken into account - e.g. vertical
mounting/shaft position.
It is possible to relubricate motors, shaft heights 180 and 225. A lubricating nipple is
optionally provided, Code K40.
Relubrication intervals
Relubrication intervals are specied:
• on the lubrication plate of the motor
• in the table "Relubrication intervals"
Note
Longer time periods between delivering and commissioning the motor
For longer periods of time (e.g. longer than 1 relubrication interval) between shipping and
commissioning the motor, the bearings must be lubricated. When relubricating, the shaft
must be rotated in order to distribute the grease around the bearings (for additional
information, see the Operating Instructions).
Mechanical properties
4.4Types of bearing
1PH8 SIMOTICS M main motors
92 Conguration Manual, 12/2022, A5E51895839A
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