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Revision as of 12:36, 5 September 2014 by Semafoor (talk | contribs) (Expand the cost estimation)
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Project InductionHeater
Status Initializing
Contact smeding, gori
Last Update 2014-09-05

Idea is to make a 3kW induction spool to smelt metals and heat steel for forging. For examples see :

Inverter circuit

Smeding had designed a circuit and made a BOM, see below:

Component cost
Bridge rectifier €2.56
switching transistor €22.92
Tank capacitors 20.50
DC link filter capacitor €23.14
Gate driver €7.06
Couple transformer Toroid €20 (est.)
Gate drive transormer toroid €3
Estimate for components killed (see below) €60
Total €160

Based on Smedings estimate Obviously, some parts may die a gruesome death during construction and testing. Worst case estimate is that the switching transistor and the driver will die twice, adding an amount of €60 to the BOM before we have a working machine.

Additional hardware

In addition to the inverter circuit, at least the following things are needed to make a working induction heater

Component cost Possible sources requirements
Coil € 15 ? Gas tubing, car brake tubing Copper. Sufficient copper area to handle the current. Sufficient inner area + diameter to allow for effective cooling
heat exchanger €15 ? Car junkyard Unsure how much heat needs to be removed and at what temperatures. Worst Case would be 3 kW. A car radiator is probably good (cheap, sufficient power and an integrated fan)
Pump €20 Possibly a pump from a domestic heater (CV). Buy for around €20 on Marktplaats Have to check whether or not normal sizes create sufficient flow through small diameter coil tubing
Electrical connections and wiring € 20 Battery connections form scrapped cars? How much current do we expect, and how long do the wires have to be? how do we connect these to the coil tubing (Earth blocks?
Tubes and other cooling connectors 15€
Total cost € 85 (incomplete)

Total cost

Inverter €160
Hardware €85
Total €245

Now we need financing. The current total is €245, and that isn't complete so far (although it may get close)


  • Gori: 50 euro
  • Flok: 10 euro
  • Walter: 50 евра
  • FooBar: €20
  • bertrik: €10
  • Semafoor: €20 (more if the project is better defined)