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This | [[File:Induction Heaters.jpg|thumb|200px|right|Induction Heaters]] | ||
'''Induction Heaters''' are used in several thermal processes such as heating of metals, forging, annealing, heat penetration, melting, and welding. | |||
==Induction Heating operating principle== | |||
Induction heating results from the direct application of two physical laws, the LENZ law and the JOULE effect: any electrically conductive material placed in a variable magnetic field (generated by an exciting winding called inductor) is the site of induced electric currents, called eddy currents. Due to the Joule effect (P =R x I² ), these currents dissipate heat in the material in which they appeared. | |||
In order to transfer a maximum amount of energy to the part to be treated, The heat generated in the material implies a quick response and a high efficiency. | |||
Several parameters must be taken into consideration: | |||
The respective positions of the inductors and the parts to be treated (coupling, respective lengths). | |||
The supply frequency and the skin effect which characterize the dispersion of the induced current throughout the part: the higher the frequency, the closer to the surface the induced currents will concentrate. This fundamental notion is determined by the penetration depth, also referred to as skin thickness. - simpfied formulae do = 503.3 (ρ/μr f)1/2 | |||
The magnetic (relative permeability μr ), electrical (resistivity ρ) and thermal (conductivity) properties of the parts to be heated, most of which vary in accordance with the temperature. | |||
The type of inductor (geometry, type of conductor, technology). | |||
==Features== | |||
*Heating speed linked to the possibility of obtaining very high power density, | |||
*Exact location of the heating effect thanks to the inductor design and an operating frequency perfectly adapted to the part to be heated, | |||
*The possibility to heat at very high temperatures with an efficiency practically independent of the temperature, | |||
*A process perfectly adapted to industrial medium-sized and mass production requirements | |||
*Easy automation of equipment, | |||
*Absence of thermal inertia (rapid start-up), | |||
*Repeatability of operations carried out, | |||
*Often extremely high heating efficiency, | |||
*Absence of pollution from the source of heating (cold source), | |||
*Good working conditions | |||
==Video== | |||
<youtube>Q6Zrnv4OtbU</youtube> | |||