Patent ID: 6495811
Filing Date: 2002-12-17
Classification: H05B

Abstract:
Induction heating device having a hollow cylindrical body made of electrically conductive material, at least one primary induction coil and at least one actively controlled auxiliary induction coil, the at least.one primary induction coil and the at least one auxiliary induction coil being arranged in and around the cavity of the cylindrical body in such a way that, by means of the at least one primary induction coil, a first magnetic field can be produced in the cylindrical body and, by means of the at least one auxiliary induction coil, a second magnetic field can be produced in the cylindrical body, wherein the at least one auxiliary induction coil, and the at least one primary induction coil can be operated in such a way that the second magnetic field, at least in one region of the cylindrical body, counteracts the first magnetic field in such a way that the second magnetic field specifically weakens the first magnetic field to maintain a substantially uniform temperature profile on an outer surface of the cylindrical body.