Modelica.Magnetic.FluxTubes.Sources

Information

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

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.

Parameters

Name	Description
V_m	Magnetic potential difference [A]

Connectors

Name	Description
port_p	Positive magnetic port
port_n	Negative magnetic port

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 of electromagnetic 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.

Connectors

Name	Description
port_p	Positive magnetic port
port_n	Negative magnetic port
V_m	Magnetic potential difference [A]

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.

Parameters

Name	Description
Phi	Magnetic flux [Wb]

Connectors

Name	Description
port_p	Positive magnetic port
port_n	Negative magnetic port

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.

Connectors

Name	Description
port_p	Positive magnetic port
port_n	Negative magnetic port
Phi	Magnetic flux [Wb]