Indirect Core type Induction Furnace

Indirect core type induction furnace is based on the principle of Faraday’s law of mutual induction.

• There is a primary winding through which an AC current is passed. The secondary winding forms the walls of a metal container and the iron core links the primary as well as secondary winding.
• Heat produced due to induced current is transmitted to the charge by Radiation.
• This furnace is directly in competition with resistance oven.
• The portion LM of the magnetic circuit is made up of a special alloy and is kept inside the chamber of the furnace.
• This special alloy loose its magnetic properties at a particular temperature and the magnetic properties (at reach the critical temperature, the reluctance increases tends to decreasing the inductive effect to such an extent that the effect like cut off ) are regained when again this alloy cools down to the same temperature.
• The temperature of the furnace can be very effectively controlled by the LM of magnetic circuit as detachable and bars of different alloy having different critical temperature (varying between 400 ⁰C to 1000 C) are employed to have required amount of critical temperature.