DC_PermanentMagnet
Permanent magnet DC machine
Library
Modelica/Electrical/Machines/BasicMachines/DCMachines
Description
Model of a DC Machine with permanent magnets.
Armature resistance and inductance are modeled directly after the armature pins, then using a AirGapDC model. Permanent magnet excitation is modelled by a constant equivalent excitation current feeding AirGapDC. The machine models take the following loss effects into account:
- heat losses in the temperature dependent armature 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 modelled.
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 speed | 1425 | rpm |
| nominal torque | 63.66 | Nm |
| nominal mechanical output | 9.5 | kW |
| efficiency | 95.0 | % |
| armature resistance | 0.05 | Ohm at reference temperature |
| reference temperature TaRef | 20 | °C |
| temperature coefficient alpha20a | 0 | 1/K |
| armature inductance | 0.0015 | H |
| armature nominal temperature TaNominal | 20 | °C |
| armature operational temperature TaOperational | 20 | °C |
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_TaOperational | TaOperational | Operational armature temperature | Scalar | |
mo_TpmOperational | TpmOperational | Operational temperature of permanent magnet | Scalar | |
mo_Jr | Jr | Rotor's moment of inertia | Scalar | |
mo_useSupport | useSupport | Enable / disable (=fixed stator) support | Number | 0 |
mo_Js | Js | Stator's moment of inertia | Scalar | |
mo_useThermalPort | useThermalPort | Enable / disable (=fixed temperatures) thermal port | Number | 0 |
mo_ViNominal | ViNominal | Nominal induced Voltage | Scalar | |
mo_psi_eNominal | psi_eNominal | Nominal magnetic flux | Scalar | |
mo_turnsRatio | turnsRatio | Ratio of armature turns over number of turns of the excitation winding | Scalar | |
mo_phiMechanical | phiMechanical | phiMechanical | Structure | |
mo_phiMechanical/fixed | fixed | Cell of scalars | true | |
mo_phiMechanical/start | start | Cell of scalars | ||
mo_wMechanical | wMechanical | wMechanical | Structure | |
mo_wMechanical/fixed | fixed | Cell of scalars | true | |
mo_wMechanical/start | start | Cell of scalars | ||
mo_ia | ia | ia | Structure | |
mo_ia/fixed | fixed | Cell of scalars | true | |
mo_ia/start | start | Cell of scalars |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_VaNominal | VaNominal | Nominal armature voltage | Scalar | |
mo_IaNominal | IaNominal | Nominal armature current (>0..Motor, <0..Generator) | Scalar | |
mo_wNominal | wNominal | Nominal speed | Scalar | |
mo_TaNominal | TaNominal | Nominal armature temperature | Scalar |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_Ra | Ra | Armature resistance at TRef | Scalar | |
mo_TaRef | TaRef | Reference temperature of armature resistance | Scalar | |
mo_alpha20a | alpha20a | Temperature coefficient of armature resistance | Scalar | |
mo_La | La | Armature inductance | Scalar |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_frictionParameters | frictionParameters | Friction loss parameter record | FromModelica('Modelica.Electrical.Machines.Losses.FrictionParameters') | |
mo_coreParameters | coreParameters | Armature core loss parameter record | FromModelica('Modelica.Electrical.Machines.Losses.CoreParameters') | |
mo_strayLoadParameters | strayLoadParameters | Stray load loss parameter record | FromModelica('Modelica.Electrical.Machines.Losses.StrayLoadParameters') | |
mo_brushParameters | brushParameters | Brush loss parameter record | FromModelica('Modelica.Electrical.Machines.Losses.BrushParameters') |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'tauElectrical' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
flange | implicit | Shaft | input | 1 |
pin_ap | implicit | Positive armature pin | input | 2 |
pin_an | implicit | Negative armature pin | output | 1 |
Port 4 | implicit | Support at which the reaction torque is acting | input | mo_useSupport |
Port 5 | implicit | input | mo_useThermalPort |