Configuration
5.3 Output coupling
1FT2 synchronous motors for SINAMICS S120
Configuration Manual, 03/2021, A5E50645584B AA
65
Defining the motor
By varying, you can find the motor that satisfies the conditions of the operating mode (duty
cycle).
• Determine the motor current at base load. The calculation depends on the type of motor
(synchronous motor or induction motor) and the operating mode (duty cycle) used.
Note
When configuring according to duty cycle with constant ON duration with overload, the
overload current is calculated in relation to the required overload torque.
• Comply with the thermal limits of the motor.
• Configure the other properties of the motor through the available motor options.
5.3 Output coupling
Motor damage caused by rotating forces
Output couplings, especially stiff metal bellows-type couplings can exercise rotating forces
on the shaft. These forces can result in bearing motion and in turn damage the motor.
Rotating forces are not permissible.
To achieve optimum output characteristics, we recommend ROTEX
Ⓡ
GS couplings from the
KTR company.
The advantages of ROTEX
Ⓡ
GS couplings are as follows:
• 2 to 4x torsional stiffness of a belt gearbox
• No teeth meshing (when compared to a belt gearbox)
• Low moment of inertia
• Good closed-loop control response
KTR can provide support when selecting the coupling, see http://www.ktr.com
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