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.

 

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.