how does inductor heater work?

An induction heater works using the principles of electromagnetic induction to heat metal objects without direct contact. It's a fascinating mix of physics and practical engineering.

Here’s a clear breakdown of how it works:

🔄 Basic Principle

At its core, induction heating uses AC (alternating current) flowing through a coil to generate a rapidly changing magnetic field. When a metal object is placed inside or near this coil, the changing magnetic field induces eddy currents inside the metal. These eddy currents flow in loops within the conductive metal and create resistive (Joule) heating — basically, the metal heats itself up from within.

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🔧 Step-by-Step Working

1. High-Frequency AC is passed through a copper coil.

2. This creates a rapidly changing magnetic field around the coil.

3. When a conductive material (like iron or copper) is placed inside the coil:

   • The magnetic field induces eddy currents in the metal.

   • If the metal is magnetic (like iron), hysteresis losses also contribute to heating.

4. The resistance of the metal to these eddy currents converts electrical energy into heat, causing the metal to get very hot.

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🔥 Heating Methods