Литейная печь из чугуна 2

Application Industry:

Aluminum, Iron, Steel, Copper & brass, Stainless steel. etc. 

What factors should customers pay special attention to when purchasing induction furnace?

1. Long-term stable working condition, why?

 A: From our experience, customers will have to pay a much higher maintenance cost when they

     only care about the price itself. 

2. Energy-saving, why?

 A: Power consumption is a large part of the production cost especially for foundry industry.

MF power supply selection reference

Medium frequency coreless induction melting furnace working principle

No core is provided in the coreless induction furnace. A crucible of more convenient shape can be employed.

In this case, also the charge to be melted is made the secondary of the transformer. The primary is wound over the crucible itself. The eddy currents produced in the charge not only heat it up but also  account for the stirring action. It is the basic coreless induction furnace principle. 

Iron laminations are provided outside the primary winding to create a low reluctance path for flux and also contain the stray field which may otherwise induce the heavy current in supporting steel structure. 

The frequency employed depends upon the size of the coreless induction furnace. For lower capacities of furnaces higher frequency of the order of 3000Hz are employed whereas for higher capacities frequencies are down to 600Hz. To reduce copper losses, hollow copper tubes are used in which cold water is circulated.

The operating power factor of such furnaces is very low (between 0.1 and 0.3). Therefore, static capacitors are used to improve the power factor of the installation. 

Since the power factor does not remain constant during the operation of the furnace, the capacitance in the circuit during heat cycle is varied to maintain power factor approximately unity. 

The coreless induction furnace is chiefly used for melting of steel and other ferrous metals. The capacities available vary from 250kg to about 20 tons. The initial cost is more as compared to arc furnace.

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