A primary coil with a larger number of turns and a secondary coil with a smaller number of turns are mounted on the same core. The ratio of the input to the output voltage is equal to the ratio of the turns of the coil while the energy remains the same. Therefore, the secondary coil generates a large current under low voltage conditions. For an induction heater, the bearing is a short-circuited, single-turn secondary coil that passes a large current at a lower AC voltage, thus generating a large amount of heat. The heater itself and the yoke remain at normal temperature. Since this heating method can induce current, the bearing will be magnetized. It is important to ensure that the bearing is demagnetized in the future so that it does not attract metal chips during operation. The FAG induction heater has an automatic degaussing function .
It is the use of metal to generate eddy currents in an alternating magnetic field to heat itself, and is usually used in metal heat treatment. The principle is that when a thicker metal is in an alternating magnetic field, current is generated due to electromagnetic induction. When a thicker metal produces an electric current, the current will form a spiral flow path inside the metal, so that the heat generated by the current flow is absorbed by the metal itself, which causes the metal to heat up quickly.