modelDC_CompareCharacteristics
Test example: Compare torque-speed characteristic of DC motors
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
Test example: Compare characteristic of DC motors
The motors are started at nominal speed, then load is ramped down. Simulate for 6 seconds and plot dcxx.wMechanical (motor speed) versus dcxx.tauElectrical (motor torque).
Default machine parameters are used.
Note that the characteristics of permanent magnet and electrical excited dc machine (at nominal excitation) is identical, but speed of the series excited dc machine rises when load torque is lowered. Dynamic increase of speed is determined by the sum of inertias. Load torque of the series excited is not lowered to zero, otherwise speed would rise infinitely.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Voltage | Va | 100 | Actual armature voltage |
| SI.Voltage | Ve | 100 | Actual excitation voltage |
| SI.Torque | TLoad | 63.66 | Nominal load torque |
| SI.Time | tStart | 0.5 | Start of load torque ramp |
| SI.Time | tRamp | 5.0 | Load torque ramp |
| SI.Inertia | JLoad | 0.15 | Load's moment of inertia |
| Modelica.Electrical.Machines.Utilities.ParameterRecords.DcPermanentMagnetData | dcpmData | Parameters of permanent magnet dc machine | |
| Modelica.Electrical.Machines.Utilities.ParameterRecords.DcElectricalExcitedData | dceeData | Parameters of electrical excited dc machine | |
| Modelica.Electrical.Machines.Utilities.ParameterRecords.DcSeriesExcitedData | dcseData | Parameters of series excited dc machine |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Electrical.Analog.Sources.ConstantVoltage | armatureVoltage | ||
| Modelica.Electrical.Analog.Basic.Ground | groundArmature | ||
| Modelica.Electrical.Analog.Sources.ConstantVoltage | excitationVoltage | ||
| Modelica.Electrical.Analog.Basic.Ground | groundExcitation | ||
| Modelica.Electrical.Machines.BasicMachines.QuasiStaticDCMachines.DC_PermanentMagnet | dcpm | ||
| Modelica.Mechanics.Rotational.Components.Inertia | loadInertia1 | ||
| Modelica.Mechanics.Rotational.Sources.Torque | loadTorque1 | ||
| Modelica.Electrical.Machines.BasicMachines.QuasiStaticDCMachines.DC_ElectricalExcited | dcee | ||
| Modelica.Mechanics.Rotational.Components.Inertia | loadInertia2 | ||
| Modelica.Mechanics.Rotational.Sources.Torque | loadTorque2 | ||
| Modelica.Electrical.Machines.BasicMachines.QuasiStaticDCMachines.DC_SeriesExcited | dcse | ||
| Modelica.Mechanics.Rotational.Components.Inertia | loadInertia3 | ||
| Modelica.Mechanics.Rotational.Sources.Torque | loadTorque3 | ||
| Modelica.Blocks.Sources.Ramp | ramp | ||
| Blocks.Nonlinear.Limiter | limiter |