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

Dibuat oleh

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.
Menengah
3 hours

Instruksi

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.

Material untuk langkah ini:

Kawat tembaga telanjang 10 AWGKawat tembaga telanjang 10 AWG1 meter

Alat yang dibutuhkan:

Set tangSet tang
Penggaris BajaPenggaris Baja
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.

Material untuk langkah ini:

Modul pemanas induksi ZVSModul pemanas induksi ZVS1 buah

Alat yang dibutuhkan:

Catu Daya Meja yang Dapat DiaturCatu Daya Meja yang Dapat Diatur
Kacamata Pengaman BeningKacamata Pengaman Bening
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.

Material untuk langkah ini:

Pelat Baja LunakPelat Baja Lunak1 buah
Lembaran baja nirkaratLembaran baja nirkarat1 buah
Lembaran aluminiumLembaran aluminium1 buah
Lembaran TembagaLembaran Tembaga1 buah
Set magnet neodimiumSet magnet neodimium1 set

Alat yang dibutuhkan:

Gunting sengGunting seng
Kikir LogamKikir Logam
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.

Alat yang dibutuhkan:

Termometer InframerahTermometer Inframerah
StopwatchStopwatch
Sarung tangan lasSarung tangan las
Set tangSet tang
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.

Alat yang dibutuhkan:

Wajan besi corWajan besi cor
Panci berdinding tinggiPanci berdinding tinggi
Set magnet neodimiumSet magnet neodimium
6

Skin depth and your results

Memuat 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.
Langkah 7 - Image 1

Bahan

7

Alat yang Diperlukan

12

Blueprint terkait

Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip

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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.

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