WOLFRAM SYSTEMMODELER

DCSE_SinglePhase

Test example: DC with serial excitation starting with voltage ramp

Diagram

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 singlephase 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

tStart

Value: 0.1

Type: Time (s)

Description: Start of resistance ramp

tRamp

Value: 0.9

Type: Time (s)

Description: Resistance ramp

TLoad

Value: 63.66

Type: Torque (N·m)

Description: Nominal load torque

wLoad

Value: 1410 * 2 * Modelica.Constants.pi / 60

Type: AngularVelocity (rad/s)

Description: Nominal load speed

JLoad

Value: 0.15

Type: Inertia (kg·m²)

Description: Load's moment of inertia

dcseData

Value:

Type: DcSeriesExcitedData

Description:

Components (8)

dcse

Type: DC_SeriesExcited

Description:

ramp

Type: Ramp

Description:

constantVoltage

Type: SineVoltage

Description:

ground

Type: Ground

Description:

loadInertia

Type: Inertia

Description:

quadraticLoadTorque

Type: QuadraticSpeedDependentTorque

Description:

variableResistor

Type: VariableResistor

Description:

dcseData

Type: DcSeriesExcitedData

Description: