The peculiarities of electromagnetic processes at induction heating of ferromagnetics by flat circular multiturn solenoid

The article presents the results of electromagnetic processes research in the induction heating system. The system of the induction heating consists of flat circular multiturn solenoid. It is located above the plane of thin-walled sheet non-magnetic metal. Calculation dependences have been got for the current induced in the sheet metal blank and the ratio of transformation. The ratio of transformation is determined as a relation of amplitudes of the exciting current and the current induced in the blank in the circle of radius. Maximum ratio of transformation is defined taking into account spreading of eddy currents over all the area of sheet-metal. Calculation dependances for the estimation of the thermal processes at heating ferromagnetics by a flat multiturn solenoid have been obtained. The definition of the «relative heating temperature» integrally takes into account the influence of the skin effect peculiarities on the temperature indices of induction heating, that is, not only the conductive but magnetic properties of the metal of the blank. This makes it possible to perform all the necessary numerical estimations of the characteristics of the processes in the «inductor‒sheet blank» system under consideration, taking into account the peculiarities stemming from field penetration processes during induction heating of thin-walled ferromagnetics