Technical data and characteristics
6.1 Explanations of the formula abbreviations
1FW6 Built-in torque motors
162 Configuration Manual, 07/2017, 6SN1197-0AE00-0BP9
For the SINAMICS S120 drive system, as a result of the field weakening function, when the
"voltage limiting characteristic" is reached, then the voltage induced in the motor winding is
automatically compensated. As a consequence, the speed range of a motor can be
extended without requiring a larger power module. The operating points for field weakening
that can be reached when motoring, are located to the left or below the "voltage limiting
characteristic with field weakening" and to the right of the "voltage limiting characteristic".
Note
Above a certain speed, a Voltage Protection Module VPM is required; refer to the Chapter
"Configuring" and
"Data sheets and diagrams" regarding this topic.
Please note that as the speed increases, the rotor power loss also increases. This means
that additional measures must be taken to dissipate the rotor power loss.
The circle shown in the "Schematic description of the torque-speed diagram" diagram on the
torque axis designates the area/range around M
0
and M
0
*. In the detail view it is shown
zoomed in.
The motors described are multi-pin and have a sufficiently large thermal time constant. As a
consequence, torque M
0
can be reached, even at very low speeds.
The torque-speed diagrams for the motors can be found in Chapter "Data sheets and
diagrams."
For every frame size and active part length, the rotor power loss P
LV
is specified as a set of
characteristics "Rotor power loss with respect to speed" for the defined torque.
Figure 6-6 Rotor power loss speed diagram (example)
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