The efficiency of an induction
heating system for a specific application depends on several factors: the
characteristics of the part itself, the design of the inductor, the capacity of
the power supply, and the amount of temperature change required for the
application.
The Characteristics of the Part
METAL OR PLASTIC
To begin with, induction heating
works straightforwardly just with conductive materials, ordinarily metals.
Plastics and other non-conductive materials can frequently be heated by
implication by first heating a conductive metal susceptor which exchanges heat
to the non-conductive material.
Attractive OR NON-MAGNETIC
It is less demanding to heat
attractive materials. Notwithstanding the heat incited by swirl streams,
attractive materials likewise deliver heat through what is known as the
hysteresis impact (depicted previously). This impact stops to happen at
temperatures over the "Curie" point - the temperature at which an
attractive material loses its attractive properties. The relative resistance of
attractive materials is appraised on a "penetrability" size of 100 to
500; while non-magnetics have a porousness of 1, attractive materials can have
a penetrability as high as 500.
THICK OR THIN
With conductive materials, around
85% of the heating impact happens at first glance or "skin" of the
part; the heating power reduces as the separation from the surface increases.So
little or meager parts by and large heat more rapidly than vast thick parts,
particularly if the bigger parts should be heated completely through.
Examination has demonstrated a
relationship between the frequency of the rotating current and the heating
profundity of entrance: the higher the frequency, the shallower the heating in
the part. Frequencies of 100 to 400 kHz deliver moderately high-vitality heat,
perfect for rapidly heating little parts or the surface/skin of bigger parts.
For profound, entering heat, longer heating cycles at lower frequencies of 5 to
30 kHz have been appeared to be best.
RESISTIVITY
In the event that you utilize
precisely the same procedure to heat two same size bits of steel and copper,
the outcomes will be entirely distinctive. Why? Steel – alongside carbon, tin
and tungsten – has high electrical resistivity. Since these metals emphatically
oppose the present stream, heat develops rapidly. Low resistivity metals, for
example, copper, metal and aluminum take more time to heat. Resistivity
increments with temperature, so an extremely hot bit of steel will be more
responsive to induction heating than a frosty piece.
Inductor Design
It is inside of the inductor that
the fluctuating attractive field required for induction heating is produced
through the stream of exchanging current. So inductor outline is a standout
amongst the most vital parts of the general framework. A very much planned
inductor gives the best possible heating example to your part and augments the
productivity of the induction heating power supply, while as yet permitting
simple insertion and evacuation of the part.
Power Supply Capacity
The measure of the induction
power supply required for heating a specific part can be effectively
ascertained. Initial, one must decide the amount of vitality should be
exchanged to the work-piece. This relies on upon the mass of the material being
heated, the particular heat of the material, and the ascent in temperature
required. Heat misfortunes from conduction, convection and radiation ought to
likewise be considered.
Level of Temperature Change Required
At last, the productivity of
induction heating for particular application relies on upon the measure of
temperature change required. An extensive variety of temperature changes can be
accomodated; as a dependable guideline, more induction heating power is for the
most part used to build the level of temperature change.
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