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Electric heating by electromagnetic induction: principle and technology by John Callebaut, Laborelec.

The principle of electromagnetic induction heating is based on two physical phenomena:

1. Electromagnetic induction
2. The Joule

Electromagnetic induction is a technique for heating electrically conductive materials (metals), frequently used for many thermal processes such as melting or heating of metals.

The electromagnetic induction has the characteristic of generating heat directly to the interior of the material to be heated. This feature has many advantages over methods of heating more standards, including reduced heating times and high yields, or the possibility to heat very locally.

High power densities into play possible to obtain very rapid heating rates.


1 Introduction.

2 Physical principles
Electromagnetic induction 2.1 3
2.2 The Joule
2.3 Penetration depth

3 heating systems induction 3.1 generic aspects
3.2 energy supply and generator
3.3 Inductors

4 properties of induction heating

4.1 Power transfer: simplified calculation
4.2 Electrical efficiency
4.3 Power Factor
4.4 induction heating Features

5 Industrial Applications
5.1 metal induction melting in the crucible furnaces
5.2 Brazing
5.3 hardening of steel by induction

6 Conclusions

7 references and bibliographies

More: induction heating

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