Induction heating is a method to heat an electrically conductive object using the in the object present induced electric current. Induction heating is quick, contactless and flameless.
The principal is that with one or more coils a changing magnetic field is created. If an electrically conductive object is placed in this magnetic field, as result of the changing magnetic field, eddy currents arise in the object. Due to the Ohm resistance of the material of the object, power is dissipated in the material and heat is generated. How far the heat penetrates the object depends on the frequency of the magnetic field and the characteristics of the material. A big advance of induction heating is that it is a very well regulated and controllable process with a high yield, that it is safe, clean and quiet, and that it can be applied very locally.
Induction heaters, on the basis of the frequency of the magnetic field, can be divided up in three categories, low- middle- and high frequency, often shortened to respectively, LF, MF and HF. The choice of a specific frequency is strongly dependent on the application. An LF-heater, for example, as a result of the great penetration dept of its induced eddy currents, ensures smooth heating and is therefore extremely suitable for the assembly of components. For the disassembly of components, on the other hand, a MF-heater is better suited due to the lesser penetration depth. As a result, a bearing can for example be heated whilst the shaft on which this is mounted remains unheated. Because of this, only the bearing expands and can easily be removed from the shaft.
Induction heating can be used among others for the assembly and disassembly of crimp joints, such as for example:
- Bearings, gears and flanges, for example in train wheels, boilers or wind mills.
- The removal of attached components (for example nuts) in cars, trucks, cranes or production-installations.
Next to that it is useful for (pre-)heating:
- For the welding, soldering or hardening of metal surfaces
- To remove paint layers on metal surfaces such as automotive paint
HedoN is a worldwide expert in the area of induction heating. The technical expertise of HedoN encompasses thorough knowledge of contactless energy transmission by means of a magnetic field as well as of the technical principals regarding measurement and control that are necessary to arrange electronic systems in such a way that this is optimally achieved.
HedoN has already been developing products for induction heating for multiple customers since early 1990. Please visit the links underneath for a few examples of the developed products by HedoN.