Induction Stove for Hysteresis Experiments...

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 snipped-for-privacy@gmail.com

Reply to
kzan1234
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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?

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Reply to
Hal Murray

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

Reply to
legg

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

Reply to
Robert Baer

Even if he were, it would take ages to collect a 'good quantity of rhino poop'. Very few rhinos left. (8-(

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Reply to
John Woodgate

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

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Reply to
Rene Tschaggelar

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

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Reply to
Rene Tschaggelar

This fellow is looking to measure the effect - heating, due to a cause - hysterisis, under the influence of a measurable alternating magnetic field in the material.

"Measuring Soft Ferrite Core Properties"

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"Testing Critical Characteristics of Soft Ferrite Materials for Power Applications"

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"Ferrite Property Measurement"

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As one is dependant on the other and temperature, being characteristic material properties, they all have to be measurable (and controlable to a certain degree) before meaningful results can be extracted.

In some cases, a simple substitution of material, with all other factors fixed, will tell you all you practically need to know, as the material is seldom otherwise a candidate for user-controlled 'variation'.

RL

Reply to
legg

You mean it can be estimated.

Might as well estimate the whole shebang, which probably makes the most sense if you really want to avoid the tedium of making calibrated measurements and can only alter the hystertic properties in question by buying something else, any road.

RL

Reply to
legg

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