Siemens SIMOTICS S-1FK2 - Page 160

Torque constant k
T
Quotient obtained from the static torque and stall current.
Calculation: k
T
= M
0
/ I
0
The constant applies up to approx. 2 ∙ M
0
in the case of non-ventilated
motors
Note
This constant is not applicable when con󹪝guring the necessary rated and acceleration currents
(motor losses!).
The steady-state load and the frictional torques must also be included in the calculation.
Maximum torque M
max
Torque that is generated at the maximum permissible current. The maximum torque is brie󹪞y
available for high-speed operations (dynamic response to quickly changing loads).
The maximum torque is limited by the closed-loop control parameters.
Maximum torque (limited by converter) M
max conv
The maximum torque that can be applied (temporarily) for operation on the recommended
motor module.
Max. current I
max
This current limit is only determined by the magnetic circuit. Even if this is brie󹪞y exceeded, it
can result in an irreversible de-magnetization of the magnetic material. Speci󹪝cation of the RMS
value of a sinusoidal current.
Maximum converter current I
max conv
RMS converter output current (per phase) that can be supplied temporarily by the
recommended motor module
Maximum speed n
max
The maximum mechanically permissible operating speed n
max
is the lesser of the maximum
mechanically permissible speed and the maximum permissible speed at the converter.
Maximum permissible speed (mechanical) n
max
.
The maximum mechanically permissible speed is n
max mech
. It is obtained from the centrifugal
forces and friction forces in the bearings.
Glossary
1FK2 Synchronous Motors for SINAMICS S120
158 Con󹪝guration Manual, 02/2022, A5E46927724B AD