.Modelica.Electrical.Machines.BasicMachines.AsynchronousInductionMachines.AIM_SlipRing

Information

Model of a three phase asynchronous induction machine with slipring rotor.
Resistance and stray inductance of stator and rotor are modeled directly in stator respectively rotor phases, then using space phasor transformation and a stator-fixed AirGap model. The machine models take the following loss effects into account:

Default values for machine's parameters (a realistic example) are:

number of pole pairs p 2
stator's moment of inertia 0.29 kg.m2
rotor's moment of inertia 0.29 kg.m2
nominal frequency fNominal 50 Hz
nominal voltage per phase 100 V RMS
nominal current per phase 100 A RMS
nominal torque 161.4 Nm
nominal speed 1440.45 rpm
nominal mechanical output 24.346 kW
efficiency 92.7 %
power factor 0.875
stator resistance 0.03 Ohm per phase at reference temperature
reference temperature TsRef 20 °C
temperature coefficient alpha20s 0 1/K
rotor resistance 0.04 Ohm per phase at reference temperature
reference temperature TrRef 20 °C
temperature coefficient alpha20r 0 1/K
stator reactance Xs 3 Ohm per phase
rotor reactance Xr 3 Ohm per phase
total stray coefficient sigma 0.0667
turnsRatio 1 effective ratio of stator and rotor current
stator operational temperature TsOperational 20 °C
rotor operational temperature TrOperational 20 °C
These values give the following inductances:
stator stray inductance per phase Xs * (1 - sqrt(1-sigma))/(2*pi*fNominal)
rotor stray inductance Xr * (1 - sqrt(1-sigma))/(2*pi*fNominal)
main field inductance per phase sqrt(Xs*Xr * (1-sigma))/(2*pi*f)

Parameter turnsRatio could be obtained from the following relationship at standstill with open rotor circuit at nominal voltage and nominal frequency,
using the locked-rotor voltage VR, no-load stator current I0 and powerfactor PF0:
turnsRatio * VR = Vs - (Rs + j Xs,sigma) I0

Generated at 2020-06-05T07:38:22Z by OpenModelica 1.16.0~dev-420-gc007a39