# DC_ElectricalExcited

Electrical shunt/separate excited linear DC machine

# Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Model of a DC Machine with electrical shunt or separate excitation.
Armature resistance and inductance are modeled directly after the armature pins, then using a AirGapDC model.
The machine models take the following loss effects into account:

• 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)

No saturation is modelled.
Shunt or separate excitation is defined by the user's external circuit.
Default values for machine's parameters (a realistic example) are:

 stator's moment of inertia 0.29 kg.m2 rotor's moment of inertia 0.15 kg.m2 nominal armature voltage 100 V nominal armature current 100 A nominal torque 63.66 Nm nominal speed 1425 rpm nominal mechanical output 9.5 kW efficiency 95 % only armature efficiency 94.06 % including excitation armature resistance 0.05 Ohm at reference temperature reference temperature TaRef 20 °C temperature coefficient alpha20a 0 1/K armature inductance 0.0015 H nominal excitation voltage 100 V nominal excitation current 1 A excitation resistance 100 Ohm at reference temperature reference temperature TeRef 20 °C temperature coefficient alpha20e 0 1/K excitation inductance 1 H stray part of excitation inductance 0 armature nominal temperature TaNominal 20 °C armature operational temperature TaOperational 20 °C (shunt) excitation operational temperature TeOperational 20 °C
Armature resistance resp. inductance include resistance resp. inductance of commutating pole winding and compensation winding, if present.
Armature current does not cover excitation current of a shunt excitation; in this case total current drawn from the grid = armature current + excitation current.

# Parameters (24)

Jr Value: Type: Inertia (kg·m²) Description: Rotor's moment of inertia Value: false Type: Boolean Description: Enable / disable (=fixed stator) support Value: Jr Type: Inertia (kg·m²) Description: Stator's moment of inertia Value: false Type: Boolean Description: Enable / disable (=fixed temperatures) thermal port Value: Type: FrictionParameters Description: Friction loss parameter record Value: Type: Temperature (K) Description: Operational armature temperature Value: Type: Voltage (V) Description: Nominal armature voltage Value: Type: Current (A) Description: Nominal armature current (>0..Motor, <0..Generator) Value: Type: AngularVelocity (rad/s) Description: Nominal speed Value: Type: Temperature (K) Description: Nominal armature temperature Value: Type: Resistance (Ω) Description: Armature resistance at TRef Value: Type: Temperature (K) Description: Reference temperature of armature resistance Value: Type: LinearTemperatureCoefficient20 (¹/K) Description: Temperature coefficient of armature resistance Value: Type: Inductance (H) Description: Armature inductance Value: Type: CoreParameters Description: Armature core loss parameter record Value: Type: StrayLoadParameters Description: Stray load loss parameter record Value: Type: BrushParameters Description: Brush loss parameter record Value: Type: Current (A) Description: Nominal excitation current Value: Type: Resistance (Ω) Description: Field excitation resistance at TRef Value: Type: Temperature (K) Description: Reference temperature of excitation resistance Value: Type: LinearTemperatureCoefficient20 (¹/K) Description: Temperature coefficient of excitation resistance Value: Type: Inductance (H) Description: Total field excitation inductance Value: Type: Real Description: Stray fraction of total excitation inductance Value: Type: Temperature (K) Description: Operational (shunt) excitation temperature

# Outputs (9)

phiMechanical Default Value: flange.phi - internalSupport.phi Type: Angle (rad) Description: Mechanical angle of rotor against stator Default Value: der(phiMechanical) Type: AngularVelocity (rad/s) Description: Mechanical angular velocity of rotor against stator Default Value: inertiaRotor.flange_a.tau Type: Torque (N·m) Description: Electromagnetic torque Default Value: -flange.tau Type: Torque (N·m) Description: Shaft torque Type: PowerBalanceDCEE Description: Power balance Default Value: pin_ap.v - pin_an.v Type: Voltage (V) Description: Armature voltage Default Value: pin_ap.i Type: Current (A) Description: Armature current Default Value: pin_ep.v - pin_en.v Type: Voltage (V) Description: Field excitation voltage Default Value: pin_ep.i Type: Current (A) Description: Field excitation current

# Connectors (7)

flange Type: Flange_a Description: Shaft Type: Flange_a Description: Support at which the reaction torque is acting Type: PositivePin Description: Positive armature pin Type: NegativePin Description: Negative armature pin Type: ThermalPortDCEE Type: PositivePin Description: Positive excitation pin Type: NegativePin Description: Negative excitation pin

# Components (21)

frictionParameters Type: FrictionParameters Description: Friction loss parameter record Type: Inertia Type: Inertia Type: Fixed Type: Friction Type: CoreParameters Description: Armature core loss parameter record Type: StrayLoadParameters Description: Stray load loss parameter record Type: BrushParameters Description: Brush loss parameter record Type: PowerBalanceDCEE Description: Power balance Type: Resistor Type: InductorDC Type: Brush Type: Core Type: StrayLoad Type: ThermalAmbientDCEE Type: AirGapDC Type: Ground Type: CompoundDCExcitation Type: Ground Type: Resistor Type: InductorDC

# Used in Examples (1)

 DCEE_Start Modelica.Electrical.Machines.Examples.DCMachines Test example: DC with electrical excitation starting with voltage ramp

# Extended by (1)

 DC_ElectricalExcited Modelica.Electrical.Machines.BasicMachines.QuasiStationaryDCMachines Quasistationary electrical shunt/separate excited linear DC machine