Parameter Description - Siemens SINAMICS V90 Operating Instructions Manual

Appendix
A.4 Motor selection
A.4.2

Parameter description

Torque
● Summit torque: It refers to the maximum torque required by a motor in operation, which is
generally less than 80% of the motor's maximum torque. When the torque is a negative
value, regenerative resistors may be needed.
● Moving torque and hold torque in standstill: It refers to the torque required by a motor in
long-term operation, which is generally less than 80% of the motor's rated torque. When
the torque is a negative value, regenerative resistors may be needed.
● Effective torque: It refers to the continuous effective load torque converted into the
equivalent value on the servo motor shaft, which is generally less than 80% of the motor's
rated torque.
Speed
Maximum speed: It refers to the motor's maximum speed in operation, which is generally
lower than the rated speed. When a motor operating at the maximum speed, pay attention to
its torque and temperature rise.
Inertia and inertia ratio
Inertia refers to the force required to keep a certain physical state. Inertia ratio indicates
dynamic response performance of motors. The smaller the inertia ratio is the better response
performance a motor has.
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SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2020, A5E37208830-008