SKF TMBH 5 Instrucciones De Uso página 8

2.1 Principle of operation
The TMBH 5 portable induction heater consists
of a small graphite clamp embedded in a polymer
housing with electromagnetic coils beneath it.
When the heater is switched on, electric current
runs through these coils, generating a fluctuating
magnetic field, but no heat on the clamp itself.
However, once you set an iron or stainless-steel
component inside the clamp, the magnetic field
induces many smaller electric currents
(Eddy currents) in the component's metal.
Fig. 1 – Magnetic field 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,
around an induction heating clamp, the heat is not
coming from the clamp, but it is generated in the
component itself. This makes heating a lot more
efficient than other heating methods.
The drawback is that only components made from
iron will work with induction. Components made
of only copper or aluminum conduct electricity too
good to generate significant heat. Cast-iron and
stainless-steel work fine. A rule of thumb is: if a
magnet sticks to the component, the induction
heater 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.
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EN