Can someone simply explain to me the principle of eddy current/induction heating?
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Ok, si, yo te explico: los electrones que circulan por el inductor calentador están recorriendo el inductor de tubería de cobre de forma alterna (corriente AC), este movimiento provoca inducción en el metal introducido dentro de la bobina inductora, esta inducción crea corrientes eléctricas en el objeto metálico, estas corrientes tienen forma de anillos concéntricos, igual que si fueran anillos de metal o espiras en cortocircuito, dependiendo de la resistividad y el espesor del metal, habrá mayor o menor fricción por las corrientes, y en consecuencia mayor ó menor calor generado por la fricción de los electrones con el choque de los átomos del metal, efecto Joule. Si quieres calentar un metal muy conductor (cobre, aluminio, plata u oro) hazlo en planchas muy delgadas dentro de la bobina inductora, y aisladas unas otras, y paralelas al giro de las espiras del inductor calentador, colocadas las láminas como si llenaras un vaso de leche con galletas horizontales a la mesa. Saludos 🤗.
It works like a transformer. In a transformer two coils (windings) are wound around a ferrite core. AC power is connected to the primary side, which creates a magnetic field in the core, and that induces a current in the secondary side winding. They are very efficient, so it is near enough that the full amount of power (VA, or volts * amps) fed into the primary is available at the secondary. The main function of a transformer is to change the voltage level (e.g. 230V to 12V) and that is dependant on the ratio of the primary windings to the secondary windings around the core.
With the inductive heater the big coil you see is the primary and creates a field in its centre. If a ferrous object is placed in the coil center, it becomes a secondary except that the current is rotating inside the metal object. Since this is effectively a short circuit, it is a high current which produces heat in the ferrous metal. That is why it is not effective on aluminum etc.
Crude description, but it should suffice.