Motor Selection For Asynchronous Ac Motors (Vfc) - SEW-Eurodrive MOVIDRIVE MDX61B System Manual
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9.5
Motor selection for asynchronous AC motors (VFC)
9.5.1
Voltage/frequency characteristic
The asynchronous motor follows a load-dependent voltage/frequency characteristic in
VFC operating mode. The continuous calculation of the motor model enables the full
motor torque to be utilized right down to the lowest speeds. This characteristic curve is
set by entering the nominal motor voltage and the nominal motor frequency in the
startup function. The setting determines the speed-dependent torque and power char-
acteristics of the asynchronous motor.
The following figure shows an example of the voltage/frequency characteristic curves
of an asynchronous AC motor 230/400 V, 50 Hz.
1 Star connection; 400 V, 50 Hz
2 Delta connection: 230 V, 50 Hz
The inverter output voltage V
inal supply voltage" input value in the startup function limits the rms value of the maxi-
mum output voltage. This restriction is used whenever the connected motor has a
lower rated voltage than the power supply of the inverter. Enter the maximum permit-
ted motor voltage. Furthermore, make sure that the "nominal supply voltage" input
value is less than or equal to the supply voltage of the inverter.
Motor selection for asynchronous AC motors (VFC)
V
1
400
230
2
0
0
50
is limited by the connected supply voltage. The "nom-
O
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