UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Ophakathi
3 hours
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Ucingo lwethusi olungambozwanga 10 AWG1 imithaAmathuluzi adingekayo:
Isethi yodlawu
Irula Lensimbi2
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.
Izinto zokwakha zalesi sinyathelo:
Imojuli yokushisa nge-induction ye-ZVS1 ucezuAmathuluzi adingekayo:
Umthombo Kagesi Wasebhentshini Olungisekayo
Izibuko Zokuphepha Ezicwathile3
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.
Izinto zokwakha zalesi sinyathelo:
Ishidi Lensimbi Ethambile1 ucezu
Ishidi lensimbi engagqwali1 ucezu
Ushidi we-aluminium1 ucezu
Ishidi Lethusi1 ucezu
Isethi yezikhondlakhondla ze-neodymium1 isethiAmathuluzi adingekayo:
Isikeli sensimbi
Ifayela Lensimbi4
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.
Amathuluzi adingekayo:
Ithemomitha Ye-Infrared
Iwashi Lokumisa Isikhathi
Amagilavu okushiselaIsethi yodlawu5
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.
Amathuluzi adingekayo:
Ipani lensimbi ebunjiwe
Ibhodwe elinezindonga eziphakemeIsethi yezikhondlakhondla ze-neodymium6
6
Skin depth and your results
Skin depth and your results
Ilayisha incwadi ye-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.
Izinto
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Amathuluzi Adingekayo
12- Isibambeli
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- Amagilavu okushiselaikhomishini engu-10%Isibambeli
- Ipani lensimbi ebunjiweikhomishini engu-10%Isibambeli
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