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DC Permanent Magnet

Permanent magnet DC machine

Description

The DC PermanentMagnet (or DC Permanent Magnet) component models a DC Machine with permanent magnets. Armature resistance and inductance are modeled directly after the armature pins, using an Air Gap DC model. Permanent magnet excitation is modeled by a constant equivalent excitation current feeding the air gap.

The following losses are modeled:

 • 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)

No saturation is modeled.

Connections

 Name Description Modelica ID $\mathrm{flange}$ Shaft flange $\mathrm{support}$ Support at which the reaction torque is acting support ${\mathrm{pin}}_{\mathrm{ap}}$ Positive armature pin pin_ap ${\mathrm{pin}}_{\mathrm{an}}$ Negative armature pin pin_an $\mathrm{thermalPort}$ Optional thermal port thermalPort

Parameters

General Parameters

 Name Default Units Description Modelica ID ${J}_{r}$ 0.15 $\mathrm{kg}{m}^{2}$ Rotor moment of inertia Jr ${J}_{s}$ ${J}_{r}$ $\mathrm{kg}{m}^{2}$ Stator moment of inertia Js ${T}_{a,\mathrm{oper}}$ 293.15 $K$ Operational armature temperature TaOperational Use Support Flange $\mathrm{false}$ True (checked) means enable stator support useSupport Use Thermal Port $\mathrm{false}$ True (checked) means thermal port is enabled useThermalPort

Brush Losses

 Name Default Units Description Modelica ID $V$ $0$ $V$ Total voltage drop of brushes, if ${i}_{\mathrm{brush}}>{I}_{\mathrm{linear}}$ V ${I}_{\mathrm{linear}}$ $0.01{I}_{{a}_{\mathrm{nom}}}$ $A$ Current indicating linear voltage region of brush voltage drop ILinear

See Brush for details of the brush loss model.

Core Losses

 Name Default Units Description Modelica ID ${P}_{\mathrm{ref}}$ $0$ $W$ Reference rotor core losses PRef ${V}_{\mathrm{ref}}$ ${V}_{\mathrm{nom}}$ $V$ Reference RMS voltage VRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef

See Core for details of the core loss model.

Friction Losses

 Name Default Units Description Modelica ID ${P}_{\mathrm{ref}}$ $0$ $W$ Reference friction losses PRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef ${p}_{\omega }$ $2$ $V$ Exponent of friction power_w

See Friction for details of the friction loss model.

 Name Default Units Description Modelica ID ${I}_{\mathrm{ref}}$ ${I}_{{a}_{\mathrm{nom}}}$ $W$ Reference RMS current IRef ${P}_{\mathrm{ref}}$ $0$ $W$ Reference friction losses PRef ${\omega }_{\mathrm{ref}}$ ${\omega }_{\mathrm{nom}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef ${p}_{\omega }$ $1$ $V$ Exponent of stray load loss power_w

Nominal Parameters Parameters

 Name Default Units Description Modelica ID ${I}_{a,\mathrm{nom}}$ 100 $A$ Nominal armature current IaNominal ${\mathrm{\omega }}_{\mathrm{nom}}$ $47.5\mathrm{\pi }$ $\frac{\mathrm{rad}}{s}$ Nominal rotational speed wNominal ${T}_{a,\mathrm{nom}}$ 293.15 $K$ Nominal armature temperature TaNominal ${V}_{a,\mathrm{nom}}$ 293.15 $V$ Nominal armature voltage VaNominal

Nominal Resistances And Inductances Parameters

 Name Default Units Description Modelica ID ${\mathrm{\alpha }}_{a}$ 0 $\frac{1}{K}$ Temperature coefficient of armature resistance alpha20a ${L}_{a}$ 0.0015 $H$ Armature inductance La ${R}_{a}$ 0.05 $\mathrm{\Omega }$ Warm armature resistance Ra ${T}_{a,\mathrm{ref}}$ 293.15 $K$ Reference temperature of armature resistance TaRef

 Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.