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

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Ed

22. september 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.
Miðlungs
3 hours

Leiðbeiningar

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.

Efni fyrir þetta skref:

Ber koparvír 10 AWGBer koparvír 10 AWG1 metri

Nauðsynleg verkfæri:

TangasettTangasett
StálreglustikaStálreglustika
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.

Efni fyrir þetta skref:

ZVS span-hitunareiningZVS span-hitunareining1 stykki

Nauðsynleg verkfæri:

Stillanlegur aflgjafi fyrir vinnubekkStillanlegur aflgjafi fyrir vinnubekk
Tær öryggisglerauguTær öryggisgleraugu
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.

Efni fyrir þetta skref:

Plata úr mjúku stáliPlata úr mjúku stáli1 stykki
Plata úr ryðfríu stáliPlata úr ryðfríu stáli1 stykki
ÁlplataÁlplata1 stykki
KoparplataKoparplata1 stykki
Neodym-seglasettNeodym-seglasett1 sett

Nauðsynleg verkfæri:

PlötuklippurPlötuklippur
MálmþjölMálmþjöl
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.

Nauðsynleg verkfæri:

Innrauður hitamælirInnrauður hitamælir
SkeiðklukkaSkeiðklukka
SuðuhanskarSuðuhanskar
TangasettTangasett
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.

Nauðsynleg verkfæri:

SteypujárnspannaSteypujárnspanna
Háhliða potturHáhliða pottur
Neodym-seglasettNeodym-seglasett
6

Skin depth and your results

Hleð Jupyter-vinnubók…
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.
Skref 7 - Image 1

Efni

7

Nauðsynleg verkfæri

12

Tengd Blueprint

Þessi blueprint deila þekkingu — tækni, efni eða meginreglur

The Induction Coil

The Induction Coil

eftir VoltSE

Rafeindatækni

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Tesla Induction Motor

Tesla Induction Motor

eftir VoltSE

TÆKNI

45
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CC0 opinbert ríki

Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.

Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.

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