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General Information on AC Induction Motors
2.1 Definitions
ALA
ALA/2-14
The cantilever force diagrams in the motor Chapters show the cantilever force
F
Q
S
at various operating speeds
S
as a function of the bearing lifetime
The force diagrams and tables are only valid for standard drive shaft ends; for
non–standard drive shaft ends, dimensions are defined depending on the parti-
cular application, corresponding to the permissible force loads.
Please contact us for forces which go beyond these values.
Caution
!
S
For coupling and belt drives:
If you use mechanical transmission elements, which subject the shaft end
to a cantilever force, then you must ensure that the maximum limit values,
specified in the cantilever force diagrams, are not exceeded.
S
Only for belt drives (shaft heights 180 and 225):
For applications with extremely low cantilever force loads, it should be en-
sured that the motor shaft is subject to the minimum cantilever force speci-
fied in the diagrams. If cantilever forces are too low, this can cause the bea-
rings to roll in an undefined fashion, which can result in increased bearing
wear.
For applications with cantilever force loads, which are lower than the speci-
fied minimum cantilever forces (e.g. coupling drive), the bearing design
used for the belt drive may not be used.
For these applications, the induction motor must be ordered with a bearing
design for a coupling–type drive.
Note
S
The precise dimensioning of the cantilever forces at the shaft end must be
made in accordance with the belt manufacturer's guidelines.
only shaft height 132 (1PH7)
F
F
1QAS
QAS
F
3QAS
x+55 mm
+ max. 2000 N
F
1QAS
+ 1.1 F
F
2QAS
+ max. 2500 N
F
3QAS
Fig. 2-4
Point of application of cantilever forces at the motor shaft end
L
8000 h
h1
F
2QAS
x
1.5x
QAS
Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
11.00
09.00
F
F
F
1QAS
QAS
2QAS
x
x+55 mm
+ 0.9 F
F
1QAS
QAS
+ 1.1 F
F
2QAS
QAS
6SN1197–0AA20
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