Siemens SIMOTICS T-1FW3 Configuration Manual page 346

Appendix
A.1 Description of terms
Torque constant k (value for a 100 K average winding temperature rise)
T
Quotient obtained from the static torque and static current.
Calculation:
Note
This constant is not applicable when configuring the necessary rated and acceleration
currents (motor losses!).
The steady-state load and the frictional torques must also be included in the calculation.
Electrical time constant T
Quotient obtained from the rotating field inductance and winding resistance. T
Maximum speed n
max
The maximum permissible operating speed n
permissible speed and the maximum permissible speed at the converter.
Maximum torque M
max
Torque that is generated at the maximum permissible current.
The maximum torque is briefly available for high-speed operations (dynamic response to
quickly changing loads).
The maximum torque is limited by the closed-loop control parameters. If the current is
increased, then the rotor will be de-magnetized.
Max. current I
max, RMS
This current limit is only determined by the magnetic circuit. Even if this is briefly exceeded, it
can result in an irreversible de-magnetization of the magnetic material. Specification of the
RMS value of a sinusoidal current.
Maximum permissible speed (mechanical) n
The maximum mechanically permissible speed is n
forces and frictional forces in the bearing.
Maximum permissible speed at converter n
The maximum permissible speed during operation on a converter is n
calculated by means of the voltage induced in the motor and the voltage strength of the
converter.
344
k = M
T 0, 100K
el
max mech.
max Inv
/ I
0, 100K
is the lesser of the maximum mechanically
max
max mech
Configuration Manual, 08/2020, A5E46027705B AA
= L
el
. It is defined by the centrifugal
. This is
max Inv
1FW3 complete torque motors
/R
D ph