model DamperCage "Squirrel Cage"
parameter Modelica.SIunits.Inductance Lrsigmad "Stray inductance in d-axis per phase translated to stator";
parameter Modelica.SIunits.Inductance Lrsigmaq "Stray inductance in q-axis per phase translated to stator";
parameter Modelica.SIunits.Resistance Rrd "Resistance in d-axis per phase translated to stator at T_ref";
parameter Modelica.SIunits.Resistance Rrq "Resistance in q-axis per phase translated to stator at T_ref";
parameter Modelica.SIunits.Temperature T_ref = 293.15 "Reference temperature of both resistances in d- and q-axis";
parameter Modelica.SIunits.LinearTemperatureCoefficient alpha = 0 "Temperature coefficient of both resistances in d- and q-axis at T_ref";
extends Modelica.Electrical.Analog.Interfaces.ConditionalHeatPort(T = T_ref);
Modelica.SIunits.Resistance Rrd_actual "Actual resistance = Rrd*(1 + alpha*(T_heatPort - T_ref))";
Modelica.SIunits.Resistance Rrq_actual "Actual resistance = Rrq*(1 + alpha*(T_heatPort - T_ref))";
Modelica.Blocks.Interfaces.RealOutput i[2](each final quantity = "ElectricCurrent", each final unit = "A") = -spacePhasor_r.i_ "Currents out from damper";
Modelica.Blocks.Interfaces.RealOutput lossPower(final quantity = "Power", final unit = "W") = LossPower "Damper losses";
Machines.Interfaces.SpacePhasor spacePhasor_r annotation (Placement(transformation(extent = {
{-110, 90},
{-90, 110}})));
equation
assert(Modelica.Constants.eps <= 1 + alpha * (T_heatPort - T_ref), "Temperature outside scope of model!");
0.666666666666667 * LossPower = Rrd_actual * spacePhasor_r.i_[1] * spacePhasor_r.i_[1] + Rrq_actual * spacePhasor_r.i_[2] * spacePhasor_r.i_[2];
Rrd_actual = Rrd * (1 + alpha * (T_heatPort - T_ref));
Rrq_actual = Rrq * (1 + alpha * (T_heatPort - T_ref));
spacePhasor_r.v_[1] = Rrd_actual * spacePhasor_r.i_[1] + Lrsigmad * der(spacePhasor_r.i_[1]);
spacePhasor_r.v_[2] = Rrq_actual * spacePhasor_r.i_[2] + Lrsigmaq * der(spacePhasor_r.i_[2]);
annotation (
Icon(
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Documentation(info = "<html>\n<p>\nModel of an asymmetrical damper cage in two axis.\n</p>\n<p>\nThe damper cage has an optional (conditional) HeatPort,\nwhich can be enabled or disabled by the Boolean parameter useHeatPort.\nTemperatures of both axis are the same, both losses are added.\nMaterial properties alpha can be set differently for both d- and q-axis,\nalthough reference temperature for both resistances is the same.\n</p>\n</html>"));
end DamperCage;