![]() ![]() ![]() ![]() The induced 'eddy' current intensity is greatest at the surface of the workpiece and decreases towards its center as a function of the ratio: thickness/skin depth. Almost invariably, power sources used for induction heating provide an alternating current to the induction coil, the choice of frequency being critical to the particular heating application. Electrical power supplied to the coil is thus converted to thermal power in the workpiece through the electromagnetic field, without physical electrical connection to the workpiece. The magnetic field is produced by a suitable arrangement of conductors, the induction coil, connected to a source which can provide the required time varying current in the coil. This effect, known as induction heating, is widely used in industries ranging from the production of optical glass fiber to the heating of 25 tonne steel slabs. When an electrically conductive body is placed in the region of a time varying magnetic field, electric currents are induced in the body causing thermal power generation in the body. ![]()
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