Innovative Leaders in Bonded Magnet Technology
A Reference Guide on Product Development for
Injection Molded Magnets & Magnetic Assemblies
Is
an injection-molded magnet right
for my application?
Many
situations are perfect for injection molding a magnet. First
you must look at design inputs, energy product requirements,
environment and of course magnetic requirements. Design of
the magnet and its accompanying circuit is also very important
and must be considered early in the development stage to
obtain desirable results.
What
types of materials are available
for injection molded magnets?
Molding
compounds that range from low energy product ferrites to
high-energy product Neodymium Iron Boron (NdFeB). Other rare
earth elements can also be injection molded to meet your
magnetic requirements. These materials are often custom compounded,
without added costs, to meet your exact magnetic requirements.
What
types of polymer binders are used?
Many
binder systems can be used when injection molding magnets.
Typically a Nylon 6 or Nylon 12 is used. Other options include
PPS, EEA, or Heat Resistant Polyamides. When optimizing a
2nd or 3rd Operation in the molding process there is a very
large range of thermoplastics available to meet specific
requirements.
What
does an injection molded magnet offer
that other magnets
don’t?
This
type of magnet allows engineers to add unique features to
the magnet or magnet assembly that cannot be easily obtained
using ceramic or sintered magnets. Injection molded magnets
are far less brittle, offer tighter tolerances, and meet
magnetic requirements to a tighter tolerance.
What
type of design features can be realized
in an injection molded
magnet?
Design
features may be assembly keys, mechanical features, reduced
part weight and size, inserts, and unique magnet geometry.
You may also utilize the option to add a second or even third
injection molding process to capture multiple design requirements
in one magnetic solution!
What
type of tolerances can be held for an
injection-molded magnet?
Unlike
other magnets, injection molded magnets offer the potential
for tight tolerances. Because of the injection molding process
we can hold tolerance down to +/- .0005" (.01mm). With
this in mind you can easily see that tighter air gaps, precision
press fits and intricate details can be achieved with great
success.
What
type of equipment and tooling are needed
in order to make
my magnet?
A
typical magnet design will include one or two injection molding
tools (1st and/or 2nd OP), a magnetizing fixture and may
include a specific magnetic test fixture. The natures of
magnetic materials are very abrasive so only the best tool
steels available are used to decrease wear.
What
is the most important aspect of designing
a magnetic circuit
using an injection molded magnet?
Timing!
Early contact is very important to the overall performance
of your design. We can offer many potential cost savings
with an early appraisal of your design.
Why
choose Tengam Engineering, Inc?
In
the beginning we recognized that in order to develop a new
industry and meet the demands of our customers we must use
innovation. Along the way we took that innovation above and
beyond expectations in order to develop new designs, materials
and compounds. For over three decades Tengam has used innovation
to provide creative solutions for your magnets and magnetic
assemblies.