As you know, when a metal body is placed in an alternating magnetic field, eddy current electric fields begin to appear inside the metal body. Eddy currents (Foucault currents) flowing in the metal body emit thermal energy, which leads to an increase in the temperature of the metal. This type of heating is called induction. If using a metal tube as the metal of the body with pumped water, it is easy to evaporate the water. The inductive steam generator is obtained.
To obtain induction heating it is necessary to create an electromagnetic field of a certain voltage and frequency. This can be done using an inductor. The steam generator inductor consists of a high — frequency transformer consisting of two windings-primary and secondary. The secondary winding is short-circuited and consists of a metal tube (inductance) and a set of capacitors (tanks). Structurally, the secondary winding is a parallel oscillating circuit, which has its own resonant frequency. By passing through the primary winding of the high-frequency transformer alternating voltage current and changing the frequency of the current, you can change the heating temperature of the metal tube, and therefore control the process of evaporation of water.
By changing the frequency of the current flowing through the primary winding of the high-frequency transformer and the capacity of the water pump, it is possible to set and obtain such physical quantities as: the amount of evaporated water per unit time, the temperature and the steam pressure at the output of the inductive steam generator.
Inductive steam generator is a reactive load for three-phase network. To reduce harmonic distortions caused by the reactive nature of the load, reduce the phase shift between the current from the network and the network voltage, reduce interference, reduce the impact on the network and increase the overall efficiency of the inductive steam generator power supply through the active power factor correction.
The used circuit solution allowed obtaining a power factor of 0.96 for each phase.