WOLFRAM SYSTEMMODELER

ForceCurrentBehaviour

Comparison of the force-current characteristics of both converter models with armature blocked at mid-position

Diagram

Wolfram Language

In[1]:=
SystemModel["Modelica.Magnetic.FluxTubes.Examples.MovingCoilActuator.ForceCurrentBehaviour"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Have a look at ConstantActuator and at PermeanceActuator for an explanation of both converter models.

Simulation of the force-current characteristics of both converter models with the armature blocked at mid-position x=0 reveals the difference between the two models. In the ConstantActuator, force is proportional to current. In the simple PermeanceActuator there is an additional non-linear force component that is due to the dependency of the inductance on the armature position. Comparison with FEA results validates the higher accuracy of the PermeanceActuator. In the FEA model, the relative permeability of the stator iron was set to mu_rFe=const.=1000 in order to avoid additional non-linear force components due to saturation. Simulate for 6 s and plot vs. current (e.g., iSensor.i)

    pmFixedPos.flange_b.f       // force of permeance model
    cFixedPos.flange_b.f        // force of converter constant model
    comparisonWithFEA.y[1]      // force of FEA model for comparison

Components (10)

pmGround

Type: Ground

pmActuator

Type: PermeanceActuator

Description: Moving coil actuator described with permeance model

pmFixedPos

Type: Fixed

Description: Fixed armature position

pmRampCurrent

Type: RampCurrent

Description: Ideal current source

cGround

Type: Ground

cFixedPos

Type: Fixed

Description: Fixed armature position

cRampCurrent

Type: RampCurrent

Description: Ideal current source

cActuator

Type: ConstantActuator

Description: Moving coil actuator described with converter constant

comparisonWithFEA

Type: CombiTable1Ds

Description: Column 1: current, col. 2: force; mu_rFe=const.=1000 in FEA model

iSensor

Type: CurrentSensor

Description: Input value for look-up table with FEA results