Siemens 1FT7 Configuration Manual page 242

Appendix
A.1 Description of terms
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 operating speed for operation at a converter is n
limited by withstand voltage, maximum frequency).
Maximum speed n
max
The maximum mechanically permissible operating speed n
mechanically permissible speed and the maximum permissible speed at the converter.
Mechanical time constant T
The mechanical time constant is obtained from the tangent at a theoretical ramp-up function
through the origin.
T
mech
J
mot
R
ph.
k
T
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.
Maximum torque (limited by converter) M
The maximum torque that can be applied (temporarily) for operation on the recommended
motor module.
NDE
Non-drive end = Non-drive end of the motor
Number of poles 2p
Number of magnetic north and south poles on the rotor. p is the number of pole pairs.
242
max conv
mech
= 3 ∙ R ∙ J /k [s]
T 2
ph mot
= Servomotor moment of inertia [kgm
= Phase resistance of the stator winding [Ohm]
= Torque constant [Nm/A]
max conv
.
max
max mech
]
2
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
. It is defined by the centrifugal
max conv
is the lesser of the maximum
max
1FT7 Synchronous Motors
(e.g.