Iron piles / yokes

Iron piles or yokes are used for the return and direction of the magnetic flux outside the furnace coil. The iron piles are physically hold the furnace coil. The construction of large crucible induction furnaces would be impossible without these iron piles. Iron piles are used with operating frequencies of up to approx. 2,000 Hz. The loss performance is between 0.35 W/kg and 1.5 W/kg of iron. The iron piles are used with a minimum projection over the coil length/height of 100 mm or the distance between the melt and the coil diameter. The iron piles are very important in the design, and the dimensions depend on the magnetic load and the mechanical requirements with regard to stability. In the case of high electrical outputs and medium frequency, the iron piles are water-cooled. Iron piles of crucible furnaces are made of ungrained plate.