Siemens SIMOTICS S-1FT7 User Manual

Configuration
5.3 Dimensioning the gearbox
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
117
5.3
Dimensioning the gearbox
Overview
● Take into account the following influencing variables when configuring the gearbox:
– Accelerating torque
– Continuous torque
– Number of cycles
– Cycle type
– Permissible input speed
– Mounting position
– Torsional play
– Torsional stiffness
– Radial and axial forces
Note
For reversing operation for servo applications, worm gearboxes are only conditionally
suitable.
● Refer to the catalogs from the gearbox manufacturer for technical data.
● Suitable shaft and flange seals must be selected if gearbox oil is in contact with the motor
flange.
Dimensioning for S3 duty
When engineering geared drive systems you can use the motor characteristic without
reduction. In so doing, take into account the permissible maximum torque and the
permissible input speed of the gearbox.
M
Mot
= M
out
/ ( i ∙ η
G
)
Motor and gearbox are assigned as follows:
M
max, gear
≥ M
0 (100 K)
∙ i ∙ f
M
max, gear
Max. permissible drive torque
M
0 (100 K)
Motor static torque
i
Gear ratio
f
Additional factor f = f
1
∙ f
2
f
1
= 2
for motor accelerating torque
f
2
= 1
for ≤1000 gearbox switching cycles / h
f
2
> 1
for > 1000 switching cycles / h (see the gearbox catalog)
e. g.
f
2
= 1.5
for 3000 switching cycles / h
f
2
= 1.8
for 5000 switching cycles / h
f
2
= 2.0
for 8000 switching cycles / h

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English