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How Does Induction Heating Work？
A source of high frequency electricity is used to drive a large alternating current through a coil.This coil is know as the work coil.See the picture opposite.The passage of current through this coil generates a very intense and rapidly changing magnetic field in the space within the workcoil.The workpiece to be heated is placed within this intense alternating magnetic field.Depending on the nature of the workpiece material,a number of things happen.The alternating magnetic field induces a current flow in the conductive workpiece.The arrangement of the work coil is like the primary where electrical energy is fed in,and the workpiece is like a single turn secondary that is short-circuited.This causes tremendous currents to flow through the workpiece.These are known as eddy currents. In addition to this,the high frequency used in induction heating applications gives rise to a phenomenon called skin effect.This skin effect forces the alternating current to flow in a thin layer towards the surface of the workpiece.The skin effect increase the effective resistance of the metal to the passage of the large current.Therefore it greatly increase the heating effect caused by the current induced in the workpiece.(Although the heating due to eddy currents is desirable in this application,it is interesting to note that transformers.Laminated transformer cores,powdered iron cores and ferrites are all used to prevent eddy currents from flowing inside transformer cores.Inside a transformer the passage of eddy currents is highly undesirable because it causes heating of the magnetic core and represents power that is wasted.
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