Configuration Manual Synchronous Motors 1FK7 - Siemens ...

Gearboxes 5
5.1 Selecting/dimensioning gearboxes and important parameters/
quantities
5.1.1 Overview
• If the gearbox oil is in contact with the motor flange, then suitable shaft and flange seals
must be selected.
• Technical data should be taken from the Catalogs of the gearbox manufacturers.
• The following influencing parameters should be taken into consideration:
- Accelerating torque, continuous torque, number of cycles, cycle type, permissible input
speed, mounting position, torsional backlash, torsional stiffness, radial and axial forces.
- Worm gearboxes are only conditionally suitable for reversing operation with servo
applications
5.1.2 Dimensioning for S3 duty for natural cooling
When engineering geared drive systems you can use the motor characteristic without reduction.
Carefully observe the permissible maximum torque and the maximum permissible input
speed of the gearbox.
Mmot = Mout / (i • ηG )
The motor and gearbox are assigned as follows:
Mmax , gear ≥ M0(100K) • i • f
Mmax, gear Max. permissible output torque
M0(100K) Motor stall torque
I Gear ratio
f Supplementary factor
f = f1 • f2
f1 = 2 for motor accelerating torque
f2 = 1 for ≤1000 gearbox switching cycles
f2 > 1 for > 1000 switching cycles (refer to the Gearbox Catalog)
1FK7 Synchronous Motors
Configuration Manual (PFK7), 10/2005 Edition, 6SN1197-0AD06-0BP1 5-1