In this article we will discuss about the design of core and coreless induction furnace. An improved form of core type furnace is Ajax-Wyatt vertical core type . ea1 ring induction type. CONSTRUCTION. OF FURNACE. The vertical-ring ioduction furnace makes use of the pat- sented Ajax-Wyatt heating element. VERTICAL CORE TYPE INDUCTION FURNACE Also known as AJAX-WYATT FURNACE. Vertical crucible is used for the charge. Bottom is usually V-shaped or .

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In direct induction heating, the eddy currents are produced within the material itself that is to be heated. The examples of direct induction heating are the high-frequency eddy current heating used for case hardening or tempering of various machine parts, annealing of steel strip indjction soldering. The core type induction furnace used for melting non-ferrous metals such as copper, zinc, brass. Coreless induction furnace used for preparing various high-grade steels also work on the same principle.

The example of indirect induction heating is the indirect induction oven which is preferred over resistance oven wuatt to its fine temperature control. It is used for the same purpose as the resistance oven. Moreover, inductuon the indirect induction heating method the eddy current are induced in the heating elements by electromagnetic induction which produces heat in heating elements.

The heat thus produced is transferred to the body to be heated by radiation. The figure shows a core type induction furnace.

Core type induction furnace is essentially a transformer with the charge of metal to be heated as single turn short circuited secondary and magnetically coupled to the primary winding by the iron core. The current flowing through the charge is very high may be of the order of several thousand amperes. From the figure, it is clear that the coupling is loose and leakage reactance is high hence the power factor is low.


To overcome this difficulty, core type induction furnace is operated at a very low frequency say 10 Hz.

The Ajax‐Wyatt or Vertical Ring Induction Furnace

The main disadvantage is that electromagnetic forces produce great turbulence of the molten metal which is useful to a certain point, but it becomes too severe unless the frequency is kept low. Another disadvantage of this furnace is that a crucible is of inconvenient shape from the metallurgical point of view. At the time of starting, a complete ring of metal must be present the crucible otherwise, the secondary circuit will remain open and heat will not be produced.

Yet another disadvantage is that it requires low frequency 10 Hz supply which requires frequency changer, which involves extra cost. On account of the above drawbacks mentioned above core type induction furnaces have been obsolete ajjax.

An improved form of core type induction furnace is Ajax Wyatt furnace. This furnace is very suitable for continuous operation and it can be operated on normal supply frequency i.

Induction Heating | Ajax Wyatt Furnace

The core is made of laminated steel and the secondary circuit is formed by the single turn of molten metal. Inductio charge is given from above and the molten metal is taken out through the spout. The stirring action is produced by the pinch effect which is proportional to the square of amp-turns.

Therefore, Ajax Wyatt vertical core furnace is very suitable for continuous operation. A proper arrangement is made for fitting the furnace to take out molten metal.


The power factor of the circuit is about 0. The melt is completed in about 1 to 2 hours for large sizes and in lesser time for smaller sizes.

Ajax Wyatt Vertical Core Furnace is used for melting and refining of non-ferrous metal like brass, copper and zinc.

Induction Heating | Ajax Wyatt Furnace – your electrical guide

Its efficiency is about 75 percent. Standard sizes of these furnaces are 60 — KW, single phase 50 Hz working at volts. Thanks for sharing this informative article. I would like to share it with https: In spite of the fact that, bobbins with amax has upgraded the creation and effectively embeddings the p. As a general rule all bobbins are having through-opening terminals, yet just picked littler center.

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AJAX furnace

The induction heating works on the transformer principle. It is also known as eddy current heating. The currents are induced by the principle of electromagnetic induction. The induction heating may be low frequency furnacs in the case of core type induction furnace or high frequency as the case with coreless induction furnaces.

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