Permeance

Constant magnetic permeance: Φ = G_m·V_m.

  • magnetic
  • Modelica Standard Library
  • 2 ports
  • 1 parameter
BlockPermeanceKindpermeanceLibraryMagnetic

Description

A constant magnetic permeance, the reciprocal of reluctance: the flux through it is proportional to the magnetic potential difference across it.

Example

Magnetic circuits A 100-turn winding drives flux through an air gap and a core, next to magnetic sources and a variable reluctance.

1 VGroundR 1 ΩWinding 100 turnsCore fluxAir gapCoreMagnetic groundGap mmfmmf 100 AGround (mmf)R_m signalVariable reluctanceFlux (variable)Ground (variable)50 ASignal mmfGround (signal)Permeance 1 µWb/AFlux (permeance)Ground (permeance)Flux 1 mWbGround (flux)Reluctance 10⁶mmf acrossGround (reluctance)
In Gradara, select a Permeance block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:DC voltageStepGroundSine waveResistorReluctanceVariable reluctanceWindingMagnetic groundMMF sourceControlled MMF sourceFlux sourceFlux sensorMMF sensor

Ports

Conserving terminals 2

  • +port_pmagnetic

    Positive magnetic port. Flux entering port_p is counted as positive Φ.

  • −port_nmagnetic

    Negative magnetic port.

Parameters

  • PermeanceG_m0.000001 Wb/A

    ≥ 0

    Permeance, in Wb/A (H). Use a positive value.

Equations

Modelica
V_m = port_p.V_m − port_n.V_m
Φ = G_m · V_m, with Φ = port_p.Φ

Implementation

Modelica Standard Library 4.1.0Modelica.Magnetic.FluxTubes.Basic.ConstantPermeance
MSL documentation

Assumptions and limitations

  • Linear: no saturation, hysteresis, or eddy currents.

Tips

  • A winding of N turns on a permeance G_m has inductance N² · G_m.

See also

Select a block in Gradara and press F1 to open its page offline.