Help Me Please. My Weller Soldering Station Has Gone Off.

[Xtrem]

Xtrem that's original idea, i must say that.
Induction heated tips!? ha!
I suppose you must act fast when soldering; because tip is getting cooler fast?

Imagine , you dont have cable cord hanging around, the handle is cold ,
you can solder everyvere , heat is very fast , i think its over 400 C in 10 sec.
im not novice in soldering , i have 3 magnastat , 2 are working , i never use these
again. ITS FOR YOU , TRY IT , you have the parts .

[kt315]

bad idea. buy this tester and measure EMF. inform us. https://aliexpress.ru/item/328623543...312.1578393212

[ivconic]

bad idea. buy this tester and measure EMF. inform us. https://aliexpress.ru/item/328623543...312.1578393212

The other day i dismantled few inductive cookers.
I posted the photos showing only upper side of coils.
I forgot to shoot and post lower side of coil setup and holder.
Plastic holder at the lower side is fed up with ferrite-lookalike plates, covering lower side.
Why the heck...?
I got explanation from more conversant friend; to direct EMF only to upper side!
So, inductive cooker is "irradiating" EMF mostly at upper side.
While at the lower side EMF is suppressed and weaken to possible limits.
Such instrument, KT; maybe can show us the relation of EMF strength and flux between upper and lower sides of inductive cooker coil.
Using the analogy; maybe search coils for detectors can be "directed" in similar fashion?
We all need good sensitivity and larger depths only from lower side of a coil, right?


Xtrem can cover his coil from all sides and prevent spreading of EMF and risking sensitive electronics on the bench.
Otherwise his soldering tool can be at the same time chip&memory erasing tool too, for the same price!

[Carl-NC]

Using the analogy; maybe search coils for detectors can be "directed" in similar fashion?

Halbach coils (and magnets) direct the field to one side. But do you want to swing a 5 kg coil?

[WM6]

I got explanation from more conversant friend; to direct EMF only to upper side!

Despite that there is even a Patent (US5070222A) that claim something your friend alike:

"..... at least one high permeability foil disposed so as to direct electromagnetic flux
generated by the induction producing element to the cooking location."

take in account location and design of such one foil (support plate), I think that according to the law of EM
physics such one change in EM flux direction by induction coil Ferrite plate support is not possible (It is not
designed as Transformer Ferrite core pots).

Such plate in on inductions cooker fact act in first line as EM flux absorber to prevent induction cooker to
cook himself out (to fry cooker inner steel parts) along with cooking food.

Patent related to this:

https://patents.google.com/patent/US4629843A/en

[ivconic]

Halbach coils (and magnets) direct the field to one side. But do you want to swing a 5 kg coil?

Is heavy, true.
But maybe really thin plates... or if possible coating from such material?
I've seen very thin "pots" made from such material, so is possible to mold with it.
Question is; is the thickness playing any role in overall efficiency?

[ivconic]

Despite that there is even a Patent (US5070222A) that claim something your friend alike:

"..... at least one high permeability foil disposed so as to direct electromagnetic flux
generated by the induction producing element to the cooking location."

take in account location and design of such one foil (support plate), I think that according to the law of EM
physics such one change in EM flux direction by induction coil Ferrite plate support is not possible (It is not
designed as Transformer Ferrite core pots).

Such plate in on inductions cooker fact act in first line as EM flux absorber to prevent induction cooker to
cook himself out (to fry cooker inner steel parts) along with cooking food.

Patent related to this:

https://patents.google.com/patent/US4629843A/en

Yes it is funny setup.
Induction cooker coil is placed just above and very close to pcb.
There are sensitive chips on pcb. One of them probably PWM controller.
There are no markings on several such chips that i saw so far, so i can't tell what are they.
But i suspect those are dedicated mcu's.
Also i saw eeprom on one pcb.
So is weird to place coil just above pcb, i was scratching my head upon that.
But than i spotted those plates and got the explanation.
It is fascinating to see the theory in real life practice, like that.

[ivconic]

On second though; those are not projected very well at all.
Dying rate is huge. Among all other possible house appliances ; induction cooker will die first.
One or two IGBTs are mounted along with rectifier bridge on the same Alu cooling plate, which is usually not large enough to provide proper cooling.
Under the whole setup there is tiny fan. Usually sucking the air into enclosure. I find those always pretty messy and greasy.
Also pcbs are having greasy areas. Fumes and other various products from cooking are sucked right into the enclosure and pcb is on direct hit from those.
Learning more on IGBT's nature; things becomes even more weird when you see such setup with massive and very strong current coil over the pcb and electronics on it.
Things becomes self explanatory now when you analyze these aspects...