Household and industrial heaters operating on the principle of inductive heating appeared relatively recently, but quickly became a serious competitor to the old modifications with traditional heating elements. With a similar heating capacity, they consume less energy resources and are able to heat up the heating circuit faster, in addition, they can be operated in conjunction with a low-quality heat carrier. Using the skills of electrical installation, you can make an induction heating boiler yourself, and drawings, diagrams and installation descriptions will help you assemble the heater from available consumables.
"Induction" consists of a core, a toroidal winding, a high-frequency generator and auxiliary elements. The first acts as a heat exchanger: when heated, it gives off heat to water or other liquid flowing through the heater. The power wire is positioned around the core in such a way that eddy currents in the metal cause it to heat up. An element is made from a copper conductor of large cross-section.
The winding is connected to a high-frequency pulse generator, due to which a current of a given frequency is obtained. The process is controlled by an electronic unit that monitors the degree of heating and can, in the event of an emergency, turn off the device in an emergency. The heater is covered with heat-insulating material and an outer decorative shell. The housing protects the operator from burns and electrical injuries in the event of damage to the insulation.
Manufacturers produce 2 types of heating "induction heaters". The first received the SAV marking. The inductor of these devices is the primary winding. It perceives a current with a frequency of 50 Hz. System short-circuited pipes, filled with a coolant, is a secondary winding combined with a heat exchanger. The latter heats up when exposed to eddy currents. Due to the limited frequencies, heaters of this type are not made more powerful than 50 kW. Connect them to a one- and three-phase network.
The second type of electric boilers is VIN. Their heat exchanger is made of a ferromagnetic alloy capable of excellent magnetization reversal, causing strong heating. In addition, the current flowing into the winding is high frequency. This achieves greater efficiency and economy of the heater. Boilers of this type are manufactured with a capacity of up to 500 kW.
When installing the "induction coil" take into account that it can interfere with the operation of various household appliances. As a rule, an electric boiler is installed a few meters from them.
The principle of operation of the heater and other electric heaters is based on the ability of conductive materials to increase their temperature under the influence of eddy currents resulting from electromagnetic induction. The latter is created by a high-frequency alternating voltage passing through the primary turns of the apparatus, assembled into a coil.