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Motor components and options
4.2 Options
4.2.3
Motors with planetary gearboxes
4.2.3.1
Properties
Overview
1FT703❑ to 1FT713☐ motors can be supplied complete with a planetary gearbox from the
factory (Siemens AG).
The gearboxes are flanged directly onto the drive end of the motors.
Benefits
● High efficiency; 1-stage: > 97 %, 2-stage: > 94 %
● Minimum torsional play; 1-stage: ≤ 4 arcmin, 2-stage: ≤ 6 arcmin
● Power transmission from the central sun wheel via planet wheels
● No shaft deflections in the planet wheel set due to symmetrical force distribution
● Very low moment of inertia and thus short acceleration times of the motors
● The gearboxes are connected to the motor shaft via an integrated clamping hub. This
requires a plain motor shaft extension. Shaft and flange accuracy tolerance N according
to DIN 42955 and vibration severity grade A according to EN 60034-14 are sufficient for
the connection. The motor flange is adapted by means of adapter plates.
● Output shaft of gearbox exactly coaxial with the motor
● The gearboxes are enclosed (seal between gearbox and motor) and filled with oil at the
factory. They are lubricated and sealed for their service life. The gearboxes are suitable
for all mounting positions.
● Degree of protection of gearbox: IP65
● Small dimensions
● Low weight
4.2.3.2
Selection and ordering data for the planetary gearboxes
The selection and ordering data for the gearboxes is provided in Chapter "SIMOTICS
Servomotors" in Catalog D 21.4
(https://support.industry.siemens.com/cs/document/109747019/) in the print version - or
online.
Note
When selecting the motor-gearbox combination, ensure that the maximum permissible
gearbox input speed is not exceeded. It must be greater than or equal to the maximum motor
speed.
At high switching frequencies, you must take into account the additional factor f
78
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
.
2
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