Definitions Of The Electrical Data; Figure 2-5 Speed-Torque Characteristic For 1Fw4 Motors - Siemens HT-direct Operating Instructions Manual

2.7

Definitions of the electrical data

Torque-speed characteristic
The layout of the converter and of the motor determines the overload capacity of the motor-
converter system. You can find more detailed information on this in the SINAMICS catalogs.
The 1FW4 motors can be briefly overloaded up to 1.5 times the rated torque. The available
base load current of the converter is reduced by overload demands. This can require the
selection of a larger converter. The following limiting characteristics always apply for all
motor and SINAMICS converter module combinations.
M
:
M
max
M/M
M
:
N
S1-duty:
P = const. :
n
:
N
n/n
N
Figure 2-5
Voltage limiting characteristics
As the speed of the permanent-magnet rotor increases, the counter-voltage of the motor that
is induced in the terminals increases to the same degree. The difference between the DC
link voltage of the converter and the increasing motor counter-voltage can be used to apply
the current. This limits the magnitude of the current which can be applied at high speeds.
CAUTION
Damage to the insulation
Continuous duty above the S1 characteristic is not thermally permitted for the motor. The
insulation can get damaged. - Also see Figure "Rotation-to-speed characteristic of the
synchronous motors".
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
Torque
: Maximum torque
: Torque/rated torque
N
Rated torque
Continuous Duty
Constant power
Rated speed
: Speed/rated speed
Speed-torque characteristic for 1FW4 motors
Description, technical data
2.7 Definitions of the electrical data
29