Modelica.Magnetic.FluxTubes.Sources

Information

This package contains sources of a magnetic potential difference or a magnetic flux:

Extends from Modelica.Icons.SourcesPackage (Icon for packages containing sources).

Package Content

Name	Description
ConstantMagneticPotentialDifference	Constant magnetomotive force
SignalMagneticPotentialDifference	Signal-controlled magnetomotive force
ConstantMagneticFlux	Source of constant magnetic flux
SignalMagneticFlux	Signal-controlled magnetic flux source

Modelica.Magnetic.FluxTubes.Sources.ConstantMagneticPotentialDifference

Information

Magnetic circuits under steady-state conditions, i.e., with stationary magnetic fields (change of magnetic flux dΦ/dt = 0) can be described with constant sources of a magnetic potential difference or magnetomotive force (mmf). Constant magnetic potential differences are imposed by

• coils with stationary current (di / dt = 0) and
• permanent magnets modelled with Thévenin's equivalent magnetic circuit.

For modelling of reluctance actuators with this source component it is assumed that the armature is fixed so that no motion-induced flux change dΦ/dt can occur.

Extends from Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary (Partial component with two magnetic ports p and n for textual programming).

Parameters

Type	Name	Default	Description
MagneticPotentialDifference	V_m		Magnetic potential differnce [A]

Connectors

Type	Name	Description
PositiveMagneticPort	port_p	Positive magnetic port
NegativeMagneticPort	port_n	Negative magnetic port

Modelica definition

model ConstantMagneticPotentialDifference 
  "Constant magnetomotive force"

  extends Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary;
  parameter SI.MagneticPotentialDifference V_m "Magnetic potential differnce";
  SI.MagneticFlux Phi "Magnetic flux from port_p to port_n";

equation 
  V_m = port_p.V_m - port_n.V_m;
  Phi = port_p.Phi;
  0 = port_p.Phi + port_n.Phi;

end ConstantMagneticPotentialDifference;

Modelica.Magnetic.FluxTubes.Sources.SignalMagneticPotentialDifference

Information

In electromagnetic devices, a change of a coil's magnetic flux linkage Ψ reacts on the electrical subsystem in that a voltage v is induced due to Faraday's law:

    v = - dΨ/dt

This reaction can possibly be neglected for

• modelling ofelectromagnetic actuators under quasi-stationary conditions (slow current change, slow armature motion),
• modelling of current-controlled electromagnetic actuators (ideal current source) and
• for system simulation where the system dynamics is not governed by an electromagnetic actuator, but by the surrounding subsystems.

In these cases, the magnetic potential difference or magnetomotive force imposed by a coil can easily be modelled with a signal-controlled source. Except for the neglected dynamics, steady-state actuator forces will be calculated properly in actuator models based on these sources.

Extends from Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary (Partial component with two magnetic ports p and n for textual programming).

Connectors

Type	Name	Description
PositiveMagneticPort	port_p	Positive magnetic port
NegativeMagneticPort	port_n	Negative magnetic port
input RealInput	V_m	Magnetic potential difference

Modelica definition

model SignalMagneticPotentialDifference 
  "Signal-controlled magnetomotive force"

  extends Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary;
  Modelica.Blocks.Interfaces.RealInput V_m "Magnetic potential difference";
  SI.MagneticFlux Phi "Magnetic flux from port_p to port_n";

equation 
  V_m = port_p.V_m - port_n.V_m;
  Phi = port_p.Phi;
  0 = port_p.Phi + port_n.Phi;
end SignalMagneticPotentialDifference;

Modelica.Magnetic.FluxTubes.Sources.ConstantMagneticFlux

Information

Sources of a constant magnetic flux are useful for modelling of permanent magnets with Norton's magnetic equivalent circuit.

Extends from Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary (Partial component with two magnetic ports p and n for textual programming).

Parameters

Type	Name	Default	Description
MagneticFlux	Phi	1	Magnetic flux [Wb]

Connectors

Type	Name	Description
PositiveMagneticPort	port_p	Positive magnetic port
NegativeMagneticPort	port_n	Negative magnetic port

Modelica definition

model ConstantMagneticFlux "Source of constant magnetic flux"

  extends Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary;
  parameter SI.MagneticFlux Phi = 1 "Magnetic flux";
  SI.MagneticPotentialDifference V_m 
    "Magnetic potential difference between both ports";

equation 
  V_m = port_p.V_m - port_n.V_m;
  Phi = port_p.Phi;
  0 = port_p.Phi + port_n.Phi;
end ConstantMagneticFlux;

Modelica.Magnetic.FluxTubes.Sources.SignalMagneticFlux

Information

This source of a magnetic flux is intended for test purposes, e.g., for simulation and subsequent plotting of a softmagnetic material's magnetisation characteristics if used together with a non-linear reluctance element.

Extends from Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary (Partial component with two magnetic ports p and n for textual programming).

Connectors

Type	Name	Description
PositiveMagneticPort	port_p	Positive magnetic port
NegativeMagneticPort	port_n	Negative magnetic port
input RealInput	Phi	Magnetic flux

Modelica definition

model SignalMagneticFlux "Signal-controlled magnetic flux source"

  extends Modelica.Magnetic.FluxTubes.Interfaces.PartialTwoPortsElementary;
  Modelica.Blocks.Interfaces.RealInput Phi "Magnetic flux";
  SI.MagneticPotentialDifference V_m 
    "Magnetic potential difference between both ports";

equation 
  V_m = port_p.V_m - port_n.V_m;
  Phi = port_p.Phi;
  0 = port_p.Phi + port_n.Phi;
end SignalMagneticFlux;