WOLFRAM SYSTEMMODELER

ArmatureStroke

Armature stroke of both moving coil actuator models after a voltage step at time t=0

Diagram

Wolfram Language

In[1]:=
Click for copyable input
SystemModel["Modelica.Magnetic.FluxTubes.Examples.MovingCoilActuator.ArmatureStroke"]
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 actuator models.

A voltage step at time t=0 is applied to both actuator models. In each model, the armature and an attached load mass perform a stroke between the two stoppers included in cActuator.armature and pmActuator.armature respectively. Simulate for 0.05 s and plot vs. time (same physical quantities together in a common diagram for comparison):

    cActuator.p.i                     // input current to converter constant model
    pmActuator.p.i                    // input current to permeance model
    cActuator.armature.flange_a.f     // actuator force of converter constant model
    pmActuator.armature.flange_a.f    // actuator force of permeance model
    cActuator.x                       // armature position of converter constant model
    pmActuator.x                      // armature position of permeance model
    cActuator.L                       // inductance of converter constant model
    pmActuator.L                      // inductance of permeance model

The initial current rise in both actuator models is due to the inductance of the actuator coil. After acceleration of the armature and the load, the current decreases due to the motion-induced back-emf. Bouncing occurs when the armatures of both models arrive at the stopper at maximum armature position. The bouncing is rather intense due to the absence of any kind of external friction in this simple example (apart from the nonlinear damping in the stopper elements). After decay of the bouncing, both actuators operate under conditions valid for a blocked armature.

Whereas the steady state current is the same in both models, the steady state actuator force is not due to the neglection of the non-linear force component in the converter constant model. Differences in the current rise of both models are due to the neglection of the coil inductance variation in the converter constant model.

Components (8)

pmGround

Type: Ground

Description:

pmSource

Type: StepVoltage

Description: Steady state current 1.5A

pmActuator

Type: PermeanceActuator

Description: Moving coil actuator described with permeance model

pmLoad

Type: Mass

Description: Load to be moved in addition to the armature mass

cGround

Type: Ground

Description:

cSource

Type: StepVoltage

Description: Steady state current 1.5A

cActuator

Type: ConstantActuator

Description: Moving coil actuator described with converter constant

cLoad

Type: Mass

Description: Load to be moved in addition to the armature mass