Principle Of Operation; Distinguishing Features - SKF TWIM 15 Instrucciones De Uso

2.1 Principle of operation

The TWIM 15 portable induction heater consists
of a high temperature resistant glass illed polymer
top plate with electromagnetic coils beneath it.
When the heater is switched on, electric current
runs through these coils, generating a luctuating
magnetic ield, but no heat on the top plate itself.
However, once you set an iron or stainless-steel
component on top, the magnetic ield induces many
smaller electric currents (Eddy currents) in the
component's metal.
Fig. 1 – Magnetic ield around bearing
Because iron is a poor conductor of electricity,
when all these small currents run through the iron,
much of the energy is converted into heat. Thus, on
an induction heating plate, the heat is not coming
from the top plate surface, but it is generated in the
component itself. This makes heating a lot more
eficient than other heating methods.
The drawback is that only components made from
iron will work with induction plates. Components
made of only copper or aluminum conduct electricity
too good to generate signiicant heat. Cast-iron and
stainless-steel work ine. A rule of thumb is: if a
magnet sticks to the component, the inductive plate
will heat it up. Nonetheless, small brass or copper
rings (such as shields or bearing cages), due to its
small mass, might heat much faster than the rest of
the bearing and a low power setting must be always
chosen.

2.2 Distinguishing features

• Portable:
Thanks to the medium frequency technology
used and the right choice of materials, the
heater is light weight. This, together with the
built-in handle, makes it portable to use it in
different locations or to easily store it in a locked
place.
• Innovative heating of bearings:
Thanks to the smart construction and operating
software of the heater, a low temperature
difference in between the inner ring and outer
ring of the bearing is achieved. This reduces the
internal tensions generated due to the excessive
thermal expansion of the inner ring compared
to the one of the outer ring.
• Versatile:
Thanks to the lat shape of the induction plate,
the user no longer must choose which yoke is
needed for every component. This increases
the number of different components that you
can heat up on the plate and at the same time
reduces the number of accessories needed.
• Quiet:
Due to the medium frequency technology the
heating of components does not make noise.
An LED indicates when the heater is heating,
even if you cannot hear it. A fan might be heard
after some use. This helps to cool down the
electronics.
• Power regulation:
Thanks to the different power settings, the
heater can heat up sensitive components at a
slower pace or other than bearings.
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