Appendix
A.1 Description of terms
1FW3 complete torque motors
344 Configuration Manual, 08/2020, A5E46027705B AA
Torque constant k
T
(value for a 100 K average winding temperature rise)
Quotient obtained from the static torque and static current.
Note
This constant is not appli
cable when configuring the necessary rated and acceleration
currents (motor losses!).
-state load and the frictional torques must also be included in the calculation.
Electrical time constant T
el
Quotient obtained from the rotating field inductance and winding resistance. T
el
= L
D
/R
ph
Maximum speed n
max
The maximum permissible operating speed n
max
is the lesser of the maximum mechanically
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
max mech.
The maximum mechanically permissible speed is n
max mech
. It is defined by the centrifugal
forces and frictional forces in the bearing.
Maximum permissible speed at converter n
max Inv
The maximum permissible speed during operation on a converter is n
max Inv
. This is
calculated by means of the voltage induced in the motor and the voltage strength of the
converter.
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