Induction Stove for Hysteresis Experiments...

Guest
Hi everyone,

I'm trying to use a commercially available induction stove used for
cooking to determine the hysteresis losses (power losses)in magnetic
structures when exposed to AC fields - I hear these stoves provide
frequencies in the 20-35 kHz range - however, I'm not really sure about
the field strengths of them (I've been using a coil of wire fed into a
scope to determine the relative magnitude of the field and frequency.)

Typically these stoves set up mostly eddy currents, but also create
hysteresis losses in large iron or stainless steel pots (they only
activate if they sense a magnetic material on it.)

I'd like to work with them and avoid building a very large induction
heater which will cost a lot and have to be water cooled because of the
current that they draw.

Any suggestions or advice would be really helpful!

Thanks.

Kyle
kzan1234@gmail.com
 
On 26 Feb 2005 20:51:01 -0800, kzan1234@gmail.com wrote:

Hi everyone,

I'm trying to use a commercially available induction stove used for
cooking to determine the hysteresis losses (power losses)in magnetic
structures when exposed to AC fields - I hear these stoves provide
frequencies in the 20-35 kHz range - however, I'm not really sure about
the field strengths of them (I've been using a coil of wire fed into a
scope to determine the relative magnitude of the field and frequency.)

Typically these stoves set up mostly eddy currents, but also create
hysteresis losses in large iron or stainless steel pots (they only
activate if they sense a magnetic material on it.)

I'd like to work with them and avoid building a very large induction
heater which will cost a lot and have to be water cooled because of the
current that they draw.
Click to expand...
You may be going about this a little bass-ackward.

Firstly, hysterisis is a material characteristic that would have to be
measured, applying a controlled field. These materials are available
in structures that make this fairly easy.

Then the losses resulting in the hysterisis measurement setup have to
be measured. Calorimetric methods are the least equipment-intensive.

Heating through externally applied magnetic field is crude and
uncontrollable.

RL
 
Heating through externally applied magnetic field is crude and
uncontrollable.
Click to expand...
Many years ago, it was a classic way to heat steel for things
like, well, heat treating. Pick the frequency for the depth of
heating.

Is there a modern replacement that's better?

--
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's. I hate spam.
 
Hal Murray wrote:

Heating through externally applied magnetic field is crude and
uncontrollable.


Many years ago, it was a classic way to heat steel for things
like, well, heat treating. Pick the frequency for the depth of
heating.

Is there a modern replacement that's better?

Absolutely!
Click to expand...
Collect a good quantity of Elephant or Rhino poop and make a fire for
heating.
....sorry; you are not in the Africa flatlands...
 
Hal Murray wrote:

Heating through externally applied magnetic field is crude and
uncontrollable.


Many years ago, it was a classic way to heat steel for things
like, well, heat treating. Pick the frequency for the depth of
heating.

Is there a modern replacement that's better?
Click to expand...
Perhaps a CO2 laser with an excitation depth of few um ?
The surface picks the heat very quickly and some percentage
is reflected from the boiling metal in whatever direction
making it necessary to cover the whole process.
For some applications perhaps.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
legg wrote:

On 26 Feb 2005 20:51:01 -0800, kzan1234@gmail.com wrote:

[induction heating]

Heating through externally applied magnetic field is crude and
uncontrollable.
Click to expand...
To the contrary actually.
The field geometry of the coil is known. The resonating coil
draws as much current as it can dump into the material.
At least to me it appears as controllable as a gaz torch.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:Uc4QxNCWxuICFww8@jmwa.demon.co.uk...
I read in sci.electronics.design that Robert Baer
robertbaer@earthlink.net> wrote (in <e8AUd.7589$MY6.2228@newsread1.news
.pas.earthlink.net>) about 'Induction Stove for Hysteresis
Experiments...', on Mon, 28 Feb 2005:
Hal Murray wrote:

Heating through externally applied magnetic field is crude and
uncontrollable.


Many years ago, it was a classic way to heat steel for things
like, well, heat treating. Pick the frequency for the depth of
heating.

Is there a modern replacement that's better?

Absolutely!
Collect a good quantity of Elephant or Rhino poop and make a fire for
heating.
...sorry; you are not in the Africa flatlands...

Even if he were, it would take ages to collect a 'good quantity of rhino
poop'. Very few rhinos left. (8-(
--
Regards, John Woodgate, OOO - Own Opinions Only.
Click to expand...
How about hippo poop...... ah, but they shit in the bath so you might spend
a long time waiting for it to dry out.

DNA
 
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