Siemens SINAMICS S120 Configuration Manual page 49
Synchronous motors
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- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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Maximum speed n
max
The maximum permissible operating speed n
permissible speed and the maximum permissible speed at the converter.
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
(e.g., limited by withstand voltage, maximum frequency).
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 change 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.
Torque constant k
(value for a 100 K average winding temperature rise)
T
Quotient obtained from the static torque and stall 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.
Synchronous Motors 1FK7
Configuration Manual, (PFK7S), Edition 12.2006, 6SN1197-0AD16-0BP1
.
max
max Inv
k
= M
/ I
T
0 (100 K)
0 (100 K)
The constant applies up to approx. 2 ∙ M
self-cooled motors
is the lesser of the maximum mechanically
max
. It is defined by the centrifugal
max mech
in the case of
0(60 K)
Electrical data
4.4 Definitions
max Inv
49
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