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DC Series Excited

Series excited linear DC machine  Description

The DC SeriesExcited (or DC Series Excited) component models a DC Machine with series excitation. Armature resistance and inductance are modeled directly after the armature pins, using an Air Gap DC model.

The following losses are modeled:

 • heat losses in the temperature dependent armature winding resistance
 • heat losses in the temperature dependent excitation winding resistance
 • brush losses in the armature circuit
 • friction losses
 • core losses (only eddy current losses, no hysteresis losses)
 • stray load losses

No saturation is modeled. Series excitation has to be connected by the user's external circuit. Connections

 Name Description Modelica ID $\mathrm{flange}$ Shaft flange ${\mathrm{pin}}_{\mathrm{an}}$ Negative armature pin pin_an ${\mathrm{pin}}_{\mathrm{ap}}$ Positive armature pin pin_ap ${\mathrm{pin}}_{\mathrm{en}}$ Negative series excitation pin pin_en ${\mathrm{pin}}_{\mathrm{ep}}$ Positive series excitation pin pin_ep $\mathrm{support}$ Support at which the reaction torque is acting support $\mathrm{thermalPort}$ Optional thermal port thermalPort Parameters General Parameters

 Name Default Units Description Modelica ID ${J}_{r}$ 0.15 $\mathrm{kg}{m}^{2}$ Rotor moment of inertia Jr ${J}_{s}$ ${J}_{r}$ $\mathrm{kg}{m}^{2}$ Stator moment of inertia Js ${T}_{a,\mathrm{oper}}$ 293.15 $K$ Operational armature temperature TaOperational ${T}_{e,\mathrm{oper}}$ 293.15 $K$ Operational series excitation temperature TeOperational Use Support Flange $\mathrm{false}$ True (checked) means enable stator support useSupport Use Thermal Port $\mathrm{false}$ True (checked) means thermal port is enabled useThermalPort Excitation Parameters

 Name Default Units Description Modelica ID ${\mathrm{\alpha }}_{e}$ $\frac{1}{K}$ Temperature coefficient of excitation resistance alpha20e ${L}_{e}$ $H$ Total field excitation inductance Le ${R}_{e}$ $\mathrm{\Omega }$ Warm field excitation resistance Re ${\mathrm{\sigma }}_{e}$ 0 Stray fraction of total excitation inductance sigmae ${T}_{e,\mathrm{ref}}$ $K$ Reference temperature of excitation resistance TeRef Brush Losses

 Name Default Units Description Modelica ID $V$ $0$ $V$ Total voltage drop of brushes, if ${i}_{\mathrm{brush}}>{I}_{\mathrm{linear}}$ V ${I}_{\mathrm{linear}}$ $0.01{I}_{{a}_{\mathrm{nom}}}$ $A$ Current indicating linear voltage region of brush voltage drop ILinear

See Brush for details of the brush loss model. Core Losses

 Name Default Units Description Modelica ID ${P}_{\mathrm{ref}}$ $0$ $W$ Reference rotor core losses PRef ${V}_{\mathrm{ref}}$ ${V}_{\mathrm{nom}}$ $V$ Reference RMS voltage VRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef

See Core for details of the core loss model. Friction Losses

 Name Default Units Description Modelica ID ${P}_{\mathrm{ref}}$ $0$ $W$ Reference friction losses PRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef ${p}_{\omega }$ $2$ $V$ Exponent of friction power_w

See Friction for details of the friction loss model. Name Default Units Description Modelica ID ${I}_{\mathrm{ref}}$ ${I}_{{a}_{\mathrm{nom}}}$ $W$ Reference RMS current IRef ${P}_{\mathrm{ref}}$ $0$ $W$ Reference friction losses PRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef ${p}_{\omega }$ $1$ $V$ Exponent of stray load loss power_w

See Stray Load for details of the stray load loss model. Nominal Parameters Parameters

 Name Default Units Description Modelica ID ${I}_{a,\mathrm{nom}}$ 100 $A$ Nominal armature current IaNominal ${\mathrm{\omega }}_{\mathrm{nom}}$ $47\mathrm{\pi }$ $\frac{\mathrm{rad}}{s}$ Nominal rotational speed wNominal ${T}_{a,\mathrm{nom}}$ 293.15 $K$ Nominal armature temperature TaNominal ${T}_{e,\mathrm{nom}}$ 293.15 $K$ Nominal series excitation temperature TeNominal ${V}_{a,\mathrm{nom}}$ 100 $V$ Nominal armature voltage VaNominal Nominal Resistances And Inductances Parameters

 Name Default Units Description Modelica ID ${\mathrm{\alpha }}_{a}$ 0 $\frac{1}{K}$ Temperature coefficient of armature resistance alpha20a ${L}_{a}$ 0.0015 $H$ Armature inductance La ${R}_{a}$ 0.05 $\mathrm{\Omega }$ Warm armature resistance Ra ${T}_{a,\mathrm{ref}}$ 293.15 $K$ Reference temperature of armature resistance TaRef Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.