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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.
Kati
3 hours
Maagizo
1
1
Wind a work coil
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.
Vifaa kwa hatua hii:
Waya wa shaba mtupu 10 AWG1 mitaZana zinazohitajika:
Seti ya makoleo
Rula ya chuma2
2
Power it safely
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.
Vifaa kwa hatua hii:
Moduli ya kupasha joto kwa uingizaji ZVS1 kipandeZana zinazohitajika:
Chanzo cha Umeme cha Meza Kinachorekebishwa
Miwani ya usalama iliyo wazi3
3
Cut six discs
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.
Vifaa kwa hatua hii:
Bati la Chuma Laini1 kipande
Bati la chuma cha pua1 kipande
Bamba la alumini1 kipande
Bamba la Shaba1 kipande
Seti ya sumaku za neodimiamu1 setiZana zinazohitajika:
Mkasi wa bati
Tupa ya chuma4
4
Sixty seconds each
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.
Zana zinazohitajika:
Kipimajoto cha infrared
Saa ya kupima muda
Glavu za kulehemuSeti ya makoleo5
5
The same test on a real hob
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.
Zana zinazohitajika:
Kikaango cha chuma cha kutupwa
Sufuria yenye kuta ndefuSeti ya sumaku za neodimiamu6
6
Skin depth and your results
Skin depth and your results
Inapakia daftari la Jupyter…
7
7
History & Context
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.
Vifaa
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Zana Zinazohitajika
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- Glavu za kulehemuKamisheni 10%Kishikilia Nafasi
- Kikaango cha chuma cha kutupwaKamisheni 10%Kishikilia Nafasi
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Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
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