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Induction Hob
Raymond M. Tucker · Public domain (expired patent)
Ed

Creato da

Ed

22. settembre 2026FI
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Induction Hob

The induction coil already published makes a changing magnetic field, and the induction motor uses one to drive currents in a rotor. The cooking rung uses the same trick to heat the pan itself: no element, no flame, and a cold top - the pan is the only thing that gets hot. **US 4,169,222**, "Induction cook-top system and control", Raymond M. Tucker, assigned to Rangaire, filed 26. July 1977, granted 25. September 1979: mains rectified to DC, switched into induction heating coils under a non-metallic top, with the power set by the switching. **A mains hob is never opened or built here.** You build a LOW-VOLTAGE induction heater from a 12–24 V module and measure which metals it can heat - which is exactly why some pans work on a hob and others do nothing.
Intermedio
3 hours

Istruzioni

1

Wind a work coil

Wind 6 turns of 10 AWG bare copper wire round a 60 mm former into a flat spiral, leaving 80 mm tails. Keep the turns evenly spaced and not touching.

Materiali per questo passaggio:

Filo di rame nudo 10 AWGFilo di rame nudo 10 AWG1 metro

Strumenti necessari:

Set di pinzeSet di pinze
Riga in acciaioRiga in acciaio
2

Power it safely

Bolt the coil to the ZVS module's terminals. Set the bench supply to 12 V with a 5 A limit; the module draws several amps and its transistors get hot. Never run it with no metal near the coil for more than a few seconds, and keep the supply under 24 V.

Materiali per questo passaggio:

Modulo riscaldatore a induzione ZVSModulo riscaldatore a induzione ZVS1 pezzo

Strumenti necessari:

Alimentatore da banco regolabileAlimentatore da banco regolabile
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
3

Cut six discs

Cut 40 mm discs from mild steel, stainless (both a magnetic and a non-magnetic grade if you have them), aluminium and copper, all the same thickness. Deburr the edges. Try a magnet on each and note which hold it.

Materiali per questo passaggio:

Lamiera di acciaio dolceLamiera di acciaio dolce1 pezzo
Lamiera di acciaio inossidabileLamiera di acciaio inossidabile1 pezzo
Lamiera di alluminioLamiera di alluminio1 pezzo
Lamiera di rameLamiera di rame1 pezzo
Set di magneti al neodimioSet di magneti al neodimio1 set

Strumenti necessari:

Cesoie da lattoniereCesoie da lattoniere
Lima per metalliLima per metalli
4

Sixty seconds each

Rest each disc on a ceramic tile 5 mm above the coil, note its starting temperature, run for 60 seconds at the same supply setting, and read it again. Lift hot discs with pliers and gloves; let the module cool between runs.

Strumenti necessari:

Termometro a infrarossiTermometro a infrarossi
CronometroCronometro
Guanti da saldatoreGuanti da saldatore
Set di pinzeSet di pinze
5

The same test on a real hob

If a commercial induction hob is to hand, put a cast-iron skillet on it, then an aluminium saucepan, and see which one it will even acknowledge. Then hold a magnet to each base.

Strumenti necessari:

Padella in ghisaPadella in ghisa
Casseruola altaCasseruola alta
Set di magneti al neodimioSet di magneti al neodimio
6

Skin depth and your results

Caricamento del notebook Jupyter…
7

History & Context

**What the patent specifies:** a cook-top with rectifier, gated semiconductor switches and induction heating coils beneath a non-metallic top, with the heat set by how the coils are switched. **Modern build (derived):** a low-voltage ZVS heater and metal discs. Induction reached kitchens slowly because the electronics were dear; efficiency into the pan is high and the top stays cool enough not to burn spills on. Its limits: the pan must be magnetic (so much old aluminium and copper cookware is useless), the electronics whine, and a pan smaller than the coil couples poorly.
Passo 7 - Image 1

Materiali

7

Strumenti richiesti

12

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