Neat sketch of ‘Ajax Wyatt’ vertical core furnace:
Construction of ‘Ajax Wyatt’ vertical core furnace: Vertical core type induction heating furnace is nothing but transformer. It consists of following main parts:- Magnetic Core: Primary winding Secondary Winding: Refractory Wall Opening Cooling arrangement Tilting arrangement Control panel APFC
Working: It is based on principle of transformer. In this type of Induction heating primary winding is as usual which is wound around one limb of magnetic core but secondary winding is actually charge which is to be melted is kept in crucible. When AC Supply is given to primary winding current flows through primary winding which creates alternating flux in magnetic core this flux links to the secondary winding i.e. charge through magnetic core. Hence according to faraday’s law of electromagnetic induction emf will be induced in secondary winding that is in the charge. As charge forms a close circuit (secondary) heavy current flows through charge this current is responsible to produce heat in charge due to I2R losses. This heat is utilized to melt the charge. Where, R = Resistance of charge & I secondary current.