Siemens SINAMICS S120 Configuration Manual page 103

Figure 5-4
Example: Motor without selector gearbox
For P = constant from n
greater than 1:4 is possible.
Same motor with selector gearbox:
For gearbox stage i
possible (n
1PH4 Induction Motors
Configuration Manual, (APH4S), 08/2008, 6SN1197-0AD64-0BP1
Note
1PH4 motors are only designed for stressing in accordance with the specifications (refer
to the radial force diagram and maximum torque).
When using force/torque reinforcing elements, e.g. a gearbox, the increased mechanical
stress (e.g. from heavy belt pre-tension forces) must be carried by appropriate reinforcing
elements. The system planner must take this into consideration. For a gearbox, that
means that increased belt pre-tension forces must be carried by the gearbox, for
example, and transferred to the machine.
For drive units which, for example, are mounted to the gearbox flange or gearbox
enclosure, the motors with type of construction IM B35 must be supported at the NDE
without subjecting the motor frame to any stress.
Speed-power diagram when using a two-stage selector gearbox to extend the constant
power speed range of main spindle drive motors
= 1500 rpm to n
N
= 4 and i
1
= 375 rpm to n
N'
= 6300 rpm a constant power control range
max
= 1 a constant power control range of greater than 1:16 is
2
= 6300 rpm).
max
Motor components
5.4 Gear
103