How Does Induction Heating Work?

Induction heating is the process of heating an object (which is a conductor of electricity for example metal), by electromagnetic induction. And thus heat is produced as an act of the eddy currents that are induced in the conductor as a result of the varying electromagnetic field.

But how exactly induction heating is actually generated? How does eddy current is induced and how eddy current influences the generation of heat?

To answer these questions, one needs to look through the basics of electricity.

Let’s say there is an induction heater in place here. An induction heater consists of two main parts. The first part is an electromagnet. An electromagnet is a type of magnet where the magnetic field is produced by electric current. The magnetic popper type of an electromagnet stays as long as the electric current is flowing through it.

And the second key factor is an electronic oscillator. An electronic oscillator is nothing but an electronic circuit which produces a periodic electric signal.

With these two key factors in place, an induction heater could produce heat which can be used for various purposes.

In the induction heater, the electronic oscillator will pass high-frequency AC or alternating current through the electromagnet (the first component of the induction heater). Since the electric current is an alternating current, it will produce a rapidly alternating magnetic field. This field penetrates into the object and produces a current. This current is also known as eddy current.

Eddy current is produced when an electric conductor is moving inside a uniform magnetic field or the conductor is stationary but the magnetic field is changing.

This eddy current now will flow through the conductor. Since the conductor also has resistance, as current will pass through it, it will produce heat. And this is the induction heating.

 

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