WOLFRAM SYSTEM MODELER

# DCSE_SinglePhase

Test example: DC with serial excitation starting with voltage ramp

# Wolfram Language

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`SystemModel["Modelica.Electrical.Machines.Examples.DCMachines.DCSE_SinglePhase"]`
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# Information

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

Test example: Series excited DC machine at single-phase AC voltage started with a series resistor
At sinusoidal source voltage, a series resistor limiting the armature current, is reduced according to a ramp, causing the DC machine to start, and accelerating inertias against load torque quadratic dependent on speed, finally reaching nominal speed.
Simulate for 2 seconds and plot (versus time):
• dcse.ia: armature current
• dcse.wMechanical: motor's speed
• dcse.tauElectrical: motor's torque
Default machine parameters of model DC_SeriesExcited are used.
Note:
Since both the field and the armature current are sinusoidal, the waveform of the torque is the square of sine. Due to the additional inductive voltage drops, output of the motor is lower, compared to the same motor (DCSE_Start) at DC voltage.

# Parameters (7)

Va Value: 100 Type: Voltage (V) Description: Actual armature voltage RMS Value: 0.1 Type: Time (s) Description: Start of resistance ramp Value: 0.9 Type: Time (s) Description: Resistance ramp Value: 63.66 Type: Torque (N⋅m) Description: Nominal load torque Value: 1410 * 2 * Modelica.Constants.pi / 60 Type: AngularVelocity (rad/s) Description: Nominal load speed Value: 0.15 Type: Inertia (kg⋅m²) Description: Load's moment of inertia Value: Type: DcSeriesExcitedData Description: DC machine data

# Components (8)

dcse Type: DC_SeriesExcited Description: Series excited linear DC machine Type: Ramp Description: Generate ramp signal Type: SineVoltage Description: Sine voltage source Type: Ground Description: Ground node Type: Inertia Description: 1D-rotational component with inertia Description: Quadratic dependency of torque versus speed Type: VariableResistor Description: Ideal linear electrical resistor with variable resistance Type: DcSeriesExcitedData Description: DC machine data