FI series off grid solar inverter 24v 48v
When the eddy current flows in the metal block, a large amount of Joule heat is released. The alternating magnetic field is excited by the alternating current coil, so that the metal block placed in the alternating magnetic field generates eddy current and is heated. This is called induction heating. It is the principle based on the induction furnace for heating, melting and smelting metal. The unique advantage of induction heating is that it can be heated in a vacuum vessel without contact, so it can be used in processes such as the purification of semiconductor materials.
In the iron core of AC equipment such as transformers and AC motors, the eddy current caused by the alternating current in the coil leads to energy loss, which is called eddy current loss. Eddy current heating is harmful to electrical appliances, so the iron core is usually made of mutually insulated sheets (the sheet plane is parallel to the magnetic field lines) or thin strips (the direction of the thin strips is parallel to the magnetic field lines) to reduce the eddy current loss. In the medium and high frequency range of radio technology, iron powder or soft magnetic ferrite is often used as the magnetic core. When the alternating magnetic field causes eddy current in the iron core, if the alternating magnetic field generated by the eddy current can be ignored, the average eddy current loss power pe per unit volume in the iron core and the square of the frequency f, the magnetic induction The square of the large value B eddy current and the square of the thickness t of the sheet (or the radius r of the wire) are proportional to each other. Its calculation formula (in the international system of units) is
where ρ is the resistivity. It can be seen that the use of flakes or strips and the use of materials with higher resistivity can greatly reduce eddy current losses.
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