What is the principle of electromagnetic heating?

Electromagnetic heating is widely used in our life, such as medical equipment steam sterilizer, injection molding machine, frying machine, tea processing equipment and so on. Although we often see it, many people don't know what the principle of electromagnetic heating is.

What is the principle of electromagnetic heating?

The principle of electromagnetic heating is that the components of electronic circuit board generate alternating magnetic field. When an iron-containing container is placed on it, alternating magnetic lines of force are cut on the surface of the container, and alternating current (eddy current) is generated in the metal part at the bottom of the container. Vortex makes the carriers at the bottom of the container move irregularly at high speed, and the carriers collide with atoms to generate heat energy. So as to achieve the effect of heating articles.

In the traditional heating industry, resistance wire and timely heating are widely used, but the thermal efficiency of this traditional heating method is relatively low. When the resistance wire and the timer are energized, it mainly generates heat by itself, and then transfers the heat to the barrel, thus achieving the effect of heating items. The maximum heat utilization rate of this thermal effect is only about 50%, and the other 50% heat is radiated into the air. The power loss of all traditional resistance wire heating methods is as high as more than 50%.

Through electromagnetic induction heating, the current generates a magnetic field, which makes the iron metal pipeline heat itself. Coupled with thermal insulation materials, the heat utilization rate is as high as over 95%, and the energy saving effect can reach over 50% in theory. However, considering that the energy conversion efficiency of different quality electromagnetic induction heating controllers is different, the energy saving effect of all electromagnetic heating can generally reach at least 30% and the highest can reach 70%.