[Music]
welcome to this ansys innovation course
on multi-material inductors
in our last video
the overview video
we showed that the
three material toroidal inductor
should have higher inductance than
single material inductors
of the same size
because the material
with the highest permeability
is used for each ring that corresponds
to a different H-field range
in this video
we will verify the statement
by simulating in ansys maxwell
open aedt add a maxwell 3d design type
keep the solution type as magnetostatic
let's create the inductor geometry
first draw the core
click the cylinder command
draw four concentric cylinders
with the radii we previously designed
after drawing each cylinder
a window pops up that allows you to
specify center position
radius and height of the cylinder
specify the dimensions as shown
at any point
if you want to change the dimensions
you can double click on these
history tree elements
let's use boolean operations to create
rings from the created cylinders
select the geometry to subtract from
which is cylinder 4
and the geometry to remove
which is cylinder 3
click the subtract option
selecting this checkbox will keep copy of the
removed geometry
repeat the step by selecting
cylinder 3 and 2
do the same for cylinder 2 and 1
this time we uncheck the box to get a
hollow center
now let's create the coils
draw a single turn of a rectangular coil
by creating two boxes and use
subtraction operation
for creating one coil
then create five more coils
along the toroidal core
by selecting this coil
and clicking on duplicate around axis
specify the angle between each two coils
as 60 degree for symmetry and the total
number of duplicates
as six including the original one
now let's create coil terminals for
assigning exitations later
select all the coils
click modeler on the menu bar
then surface section
choose xy plane and click ok
you can see that several sheets are
created in the coils
and they're sectioned by the xy plane
click modeler boolean separate bodies
these sheets are now separated
so we can delete
one sheet to leave only one sheet as the
coil terminal
now let's assign materials
for both the core
and the winding
select the outer ring of the core
in the properties window
set the name to ring1
click on material value select edit
type ferrite click clone material
then we can create a custom material by
importing user-defined BH curve
to indicate the change of permeability
with H-field
change the material name to material1
choose nonlinear for relative permeability
click BH curve then click import dataset
select the BH curve data file
you created in advance
note that
the file extension has to be either
.bh or .tab
you can see the BH curve data is imported
and is plotted on the right hand side
then we can change the color
follow the same steps
for defining properties for the
remaining two rings
select all the coils change the name and
the color
and assign material as copper
now let's assign exitations
select all the coil terminals created
right click
select assign exitations
current
enter 10 amp
to enable impedance calculation
of the whole inductor
right click parameters assign matrix
select all the currents
in postprocessing
group all the currents and leave the
number of branches as one
that means no turns are in parallel
so all turns are in series
to create a solution region
click the region icon
select pad all directions similarly
and input 50 for percentage offset
to add a solution setup
right click analysis
add solution setup accept the default setup
and click ok
to ensure more accurate inductance
calculation for the materials with
non-linear permeability
click maxwell 3D on the menu bar
select design settings
under matrix/permeability computation tab
make sure incremental rather than
apparent is selected
make sure you validate the model before
you analyze it
once the analysis is complete go ahead
and view the inductance by
right clicking result solution data
select matrix and tick postprocessed
the inductance shows under group 1
copy and paste the design to create
single material toroidal inductors
for creating
single material toroidal inductors
change materials for all the three rings
to material1 in one design
material2 in another
and material3 in another design
and analyze
go ahead and view the inductance by
right clicking result solution data
similarly these are the inductance
values for the other two designs
from these results
we can say that a three material
toroidal inductor
will have higher inductance density than
single material toroidal inductors
in this case the three material inductor design
is made for a specific dc current of 10 amp
what if the dc current varies
from time to time
how do we select the dimension of each ring
for three-material inductor working at a
range of dc bias
we'll look at this scenario in our next video
by using
parametric analysis in ansys maxwell
thank you for watching this video
for more information on ansys maxwell
or any of our simulation tool
visit our ansys learning channel
ansys.com/courses today