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on video You don't need a coil for induction heating

 



The induction coil, or inductor, is the component of the system
induction heating system that determines the efficiency and output of heating the room. The complexity of the coils is
very variable, from a simple helical winding (solenoid), formed
of a certain number of coils of copper tube wound on
a mandrel, with precision machined coils of solid copper and
brazed.
The coil is used to transfer energy from the power supply
and from the induction head to the workpiece, creating an alternating electromagnetic field. This field in turn produces a current which
passes through the room "in mirror" with respect to the circulating current
in the coil. By overcoming the resistance of the part, the current
generates heat in it due to I²R losses.
A second principle is also at work when the piece
is made of a magnetic material such as carbon steel: the
hysteresis heating. The energy is then produced in the room
by the alternating magnetic field, which reverses the magnetic polarity in the workpiece. Hysteresis heating of the room does not
not exceed the temperature
of Curie (750 °C for steel), at which the permeability
magnetic of the material decreases to 1.


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