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

Creado por

Ed

22. septiembre 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

Instrucciones

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.

Materiales para este paso:

Hilo de cobre desnudo 10 AWGHilo de cobre desnudo 10 AWG1 metro

Herramientas necesarias:

Juego de alicatesJuego de alicates
Regla de aceroRegla de acero
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.

Materiales para este paso:

Módulo calentador por inducción ZVSMódulo calentador por inducción ZVS1 pieza

Herramientas necesarias:

Fuente de alimentación de banco ajustableFuente de alimentación de banco ajustable
Gafas de seguridad transparentesGafas de seguridad transparentes
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.

Materiales para este paso:

Chapa de acero dulceChapa de acero dulce1 pieza
Chapa de acero inoxidableChapa de acero inoxidable1 pieza
Chapa de aluminioChapa de aluminio1 pieza
Lámina de cobreLámina de cobre1 pieza
Juego de imanes de neodimioJuego de imanes de neodimio1 juego

Herramientas necesarias:

Tijeras de chapaTijeras de chapa
Lima para metalLima para metal
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.

Herramientas necesarias:

Termómetro infrarrojoTermómetro infrarrojo
CronómetroCronómetro
Guantes de soldadorGuantes de soldador
Juego de alicatesJuego de alicates
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.

Herramientas necesarias:

Sartén de hierro fundidoSartén de hierro fundido
Cazo altoCazo alto
Juego de imanes de neodimioJuego de imanes de neodimio
6

Skin depth and your results

Cargando el cuaderno de 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.
Paso 7 - Image 1

Materiales

7

Herramientas requeridas

12

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