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Induction Stove for Hysteresis Experiments...

Discussion in 'General Electronics' started by [email protected], Feb 27, 2005.

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  1. 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
     
  2. legg

    legg Guest

    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
     
  3. Hal Murray

    Hal Murray Guest

    Heating through externally applied magnetic field is crude and
    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?
     
  4. Robert Baer

    Robert Baer Guest

    Absolutely!
    Collect a good quantity of Elephant or Rhino poop and make a fire for
    heating.
    ....sorry; you are not in the Africa flatlands...
     
  5. I read in sci.electronics.design that Robert Baer
    ..pas.earthlink.net>) about 'Induction Stove for Hysteresis
    Experiments...', on Mon, 28 Feb 2005:
    Even if he were, it would take ages to collect a 'good quantity of rhino
    poop'. Very few rhinos left. (8-(
     
  6. 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
     
  7. 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
     
  8. Genome

    Genome Guest

    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
     
  9. legg

    legg Guest

    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"
    http://www.tscinternational.com/tech4.pdf

    "Testing Critical Characteristics of Soft Ferrite Materials
    for Power Applications"
    http://www.tscinternational.com/tech7.doc

    "Ferrite Property Measurement"
    http://www.steward.com/pdfs/cores/ferrprop.pdf

    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
     
  10. Rich Grise

    Rich Grise Guest

    And even collecting elephant poop, you'd have to compete with the scarabs.

    Cheers!
    Rich
     
  11. legg

    legg Guest

    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
     
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