And welcome back!
and in the previous video,
we have completed the geometry creation
for the EM brake example
and in this video we are going to continue with
the next steps in the simulation process
and we are going to create a setup,
the excitation, the boundary conditions,
the analysis with a parametric analysis
and then view the various results
as we vary the airgap
and see what its effects are.
So, go ahead
launch the Ansys Electronics Desktop
again AEDT for short student version.
Open the EMB file that we saved from
the EMB example part 2
and notice in this model
that the core and the coil
are touching each other.
So, we need to add some space between them
and now we can do this by assigning
an insulating boundary condition
around the coil.
Go ahead and expand the model tree
and select the folder name solids
and select the coil.
Right mouse click on it
assign boundary > insulating.
Now the insulating boundary
in the magnetostatic 3D solver
is the only assigned
internal boundary condition
and this boundary only affects
the 3D conduction paths
and it acts as an insulating surface
to prevent the current flowing
from one conductor to another.
The default boundary condition in Maxwell
is tangential fields
and so what that means that the region must
be large enough to allow for fringing fields.
Now we don't need
any additional boundary conditions
for this model.
So, next we need to assign
the excitation to the coil.
The current excitation defines the total current
that goes through the selected cross-section
in ampere turns.
In this model, we have a closed coil.
So, we need to create a section in the coil
so that we can insert an excitation.
Select the coil right mouse click
edit > surface > section
and in that pop up window select the XZ plane
and click OK.
Go ahead select the created selection
under sheets.
Right mouse click
edit > boolean > separate bodies
and notice now that we have
two sections under the sheets
and we only need one.
Select one of the sections and press delete.
Go ahead and select the remaining section.
Right mouse click > Assign excitation > Current
and leave the name as current1.
Under the properties value write Amp*Turns.
Two variables here.
Now, this is going to allow us the parameterize
the number of turns and the current
that's flowing through each of these turns.
Go ahead select the type of stranded.
and you can also swap the direction of
the current
using the swap direction radio button.
and you can keep the any direction here
and go ahead click OK.
On the popup window for Amp, the variable
keep the unit type as current,
change the unit to Amps
and the value to 1.
Click ok.
and another popup window opens for Turns,
and change the unit type to None
and the value to 200.
Click OK.
You can always click the design name in that
project manager window
and you will view the defined variables
in the properties panel.
Now, when your in that properties panel
You can also double click
on any of the parameter values
to edit these variables.
So, we need to assign the force parameter
to the brake plate to calculate the force
that exerted by the electromagnetic core on it.
Go ahead and select the brake plate
right mouse click assign parameter > force.
and in that popup window,
keep the name as Force1
go ahead select the type as virtual.
and the Lorentz force is a J X B
type of force calculation and that only works for
selections of non-magnetic material objects
which are carrying currents.
Now, the virtual force calculation
uses a virtual work approach
on these surfaces on the selected objects.
So, therefore it works fast
when there is some sort of air gap surrounding
the selected objects or the assembly.
Click OK.
Under the draw tab
click on the create region icon.
in that popup window
choose “pad all directions similarly”,
enter 100 for the value column.
Click OK.
Right click on the analysis setup
select add solution setup
and in that solve setup popup window,
go ahead and keep the defaults, click OK.
So, now let's add a parametric setup.
Go ahead right mouse click
on the optimetrics folder add > parametric.
in the popup window select add.
Another popup window comes up,
choose the variable gap,
set linear step.
and let's be a little realistic here
and set up something that's practically possible
set up the sweep with the start value
0.2 millimeter, Stop at 1 millimeter,
make the step size 0.1 mm.
Click add, click OK.
Now select the table tab
next to the sweep definition
so the you can view the various gap variables.
Go to options tab
and select save fields and mesh
and this will save the fields for each iteration.
Click OK.
Go ahead right mouse click on the mesh
and select initial mesh settings.
In that popup window curved surface meshing
move to the cursor towards the left
say approximately 3
and we are doing this just to make sure
that the number of mesh elements
that are created is within the limit for the
student version.
If you have the full version
go ahead keep the default
and you can even make the
initial mesh setting finer.
In the simulation tab
click on validate
the big green check mark
to validate the design that you have the
necessary steps completed
and be sure there is no errors to be addressed.
So, this completes the model setup.
So, lets go and analyze the parametric design.
Go ahead expand optimetrics
under the design
right mouse click on the parametric set
choose analyze
and when the analysis is done
right mouse click on the results
create a magnetostatic report
rectangular plot.
Keep the solution as setup1 LastAdaptive,
go ahead change the parameter to Force1.
Choose the quantity as Force_mag
and click on new report.
Now, this plot is a force vs gap representation.
So, you can clearly see from this plot
that there is a drop in the force
acting on the brake plate
with the increase in the airgap.
So this sounds reasonable
as the airgap increases
the reluctance to the magnetic field increases
and hence the reduction in force.
and on the same way you can also
perform a parametric analysis with turns
and amp variables
and then view the variation
of the force versus turns,
amps and gap.
To view the field plot,
double click on that design name
to go back to the 3D modeler window.
Go ahead and expand the planes
under the history tree,
select global:XZ plane.
Right mouse click on the field overlays
select the fields > B > mag_B.
and when the pop up window comes up
select Mag_B under quantity and click done
and now you can see that
the magnetic flux density plot
on the planar cross section of the EMB plate.
You can also animate these fields
makes for nice visualization.
Right mouse click on the mag_B1
in the field overlays and select animate.
In the the popup window,
under swept variables
select the parametric setup
from the dropdown menu
and ParametricSetup1
and now you will see all the variations
of the ParametricSetup1 which is gap.
Click OK.
Now you see the variation of the flux density
in the core and the brake plate
with the change in that airgap variable
between them.
You can control the speed of the animation
as well
you can export the animation as a video file.
So, thank you for watchin this video
and in the next video we will see
how we can create a 2D version
in a few steps using this 3D model
and then compare the results between them.
Between Maxwell 2D and
the Maxwell 3D simulation.
What's the difference?
Go ahead visit courses.ansys.com
and watch our other video modules
on all of the Ansys simulation tools
as well as any related topics.