Download: Induction Electric Heating: Theory and Technology

Electric heating by electromagnetic induction: principle and technologies by Jean Callebaut, Laborelec.

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

1. Electromagnetic induction
2. The joule effect

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

The special feature of electromagnetic induction is to generate heat directly inside the material to be heated. This feature has many advantages compared to more standard heating methods, in particular the reduction of heating times and high yields, or the possibility of heating very locally.

The high power densities involved allow very rapid heating rates to be obtained.

Summary:

1 Introduction.

2 Physical Principles
2.1 Electromagnetic Induction 3
2.2 The Joule effect
2.3 Depth of Penetration

3 Induction Heating Plants 3.1 Generic Aspects
3.2 Power Supply and Generator
3.3 Inductors

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4 Properties of induction heating

4.1 Power Transfer: Simplified Calculation
4.2 Electrical efficiency
4.3 Power factor
4.4 Characteristics of induction heating

5 Industrial Applications
5.1 Induction Metal Fusion in Crucible Furnaces
5.2 Brazing
5.3 Induction hardening of steel

6 Conclusions

7 References and References

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