Abstract: A power source for induction heating of articles containing ferromagnetic particles. An arrangement including the article is exposed to an electromagnetic field at a first power level for a first predetermined period of time and, subsequently to an electromagnetic field at a second power level for a second predetermined period of time. In comparison to conventional power sources, the article may be exposed to an electromagnetic field for a longer period of time without damage.

Abstract: An induction heater for heating a portion of a load comprises a side entry coil driven by a source of alternating current, with a flux concentrator located at the coil opening. The coil produces a magnetic field in the region occupied by the flux concentrator and the heated portion of the load. The flux concentrator extends along the opening of the coil and is fabricated of high permeability, low loss material, such as nickel-zinc ferrite, so as to enhance the uniformity of the magnetic field generated within the coil. In the preferred application, heating produces a complete fluid block in a cable section within the coil without overheating or damaging the cable.