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Castings for engine project

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  • ferrman1001
    I decided to do a quick restoration on the engine and cast a muffler for it, from there it grew to a total of 14 castings to complete the project. The
    Message 1 of 5 , Mar 20 10:48 PM
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      I decided to do a quick restoration on the engine and cast a muffler for it, from there it grew to a total of 14 castings to complete the project. The alternator was a washing machine motor. I counted 42 poles on the stator so I think it will generate a high enough frequency to make a cheap induction heater. Where I live they are easy to come by.

      Ernie
    • mict04
      Hi Ernie, This may seem like a silly question; how do you get this motor to do the high frequency for induction heater ? Michel
      Message 2 of 5 , Mar 22 1:16 PM
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        Hi Ernie,

        This may seem like a silly question; how do you get this motor to do the high frequency for induction heater ?

        Michel

        --- In hobbicast@yahoogroups.com, "ferrman1001" <ferrman1001@...> wrote:
        >
        > I decided to do a quick restoration on the engine and cast a muffler for it, from there it grew to a total of 14 castings to complete the project. The alternator was a washing machine motor. I counted 42 poles on the stator so I think it will generate a high enough frequency to make a cheap induction heater. Where I live they are easy to come by.
        >
        > Ernie
        >
      • ferrman1001
        Michael Glad you asked. Most motors have 2 or 4 poles and for them to generate a high frequency they have spin 50,000 rpm or more. This motor has 42 poles and
        Message 3 of 5 , Mar 22 10:55 PM
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          Michael

          Glad you asked. Most motors have 2 or 4 poles and for them to generate a high frequency they have spin 50,000 rpm or more. This motor has 42 poles and to generate 3000hz it would have to spin about 5000 rpm. Before solid state electronics came in motorgeneraters were used to achieve 3000hz.

          Ernie
        • Jim
          Is that frequency high enough for induction heating? I thought it had to be much higher than that. Jimferrman1001 wrote:
          Message 4 of 5 , Mar 23 4:53 AM
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            Is that frequency high enough for induction heating? I thought it had to be much higher than that.
            Jim

            ferrman1001 <ferrman1001@...> wrote:

            >Michael
            >
            >Glad you asked. Most motors have 2 or 4 poles and for them to generate a high frequency they have spin 50,000 rpm or more. This motor has 42 poles and to generate 3000hz it would have to spin about 5000 rpm. Before solid state electronics came in motorgeneraters were used to achieve 3000hz\�]��\]Y[��HY�[��Y��܈[�X�[ۈX][���H�Y�]Y��H]X�Y�\�[�] �����[O�������\��X[�L H �ٙ\��X[�L PXZ�˘��K�]I���ܛ�N�������B��[��[OH�\�^N��ۙH������� ��[��B�B�KK_�_
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          • tmoranwms
            We regularly use coreless induction heaters all the way down to 60Hz. These only work on huge steel pieces, where the work itself acts as a core to some
            Message 5 of 5 , Mar 25 12:27 PM
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              We regularly use coreless induction heaters all the way down to 60Hz. These only work on huge steel pieces, where the work itself acts as a core to some extent, and where the coil can be made with enough inductance (lots of turns around a large workpiece, lots of copper) that it has reasonable performance. Typical applications include billet heating, large melting furnaces, and coatings (think powder coating huge oil pipelines, fittings and whatnot).

              Frequencies of a few hundred Hz are typical for power levels over maybe 50kW, mostly for pipe heating and melting purposes (low frequencies penetrate deep into the melt, stirring it well). 10kHz and up is typically used for general purpose heating, brazing, heat treating, surface hardening, etc. Very high frequencies (100+ kHz) are typically used where very shallow surface hardening is necessary, for brazing, and on physically small parts (occasionally, frequencies up to 13.8MHz and beyond are used for very small parts).

              The highest design frequency I've heard of for a rotating generator is 100kHz:
              http://en.wikipedia.org/wiki/Alexanderson_alternator

              Electronic means are of course more available for most any frequency, and the only way for >100kHz.

              Tim

              --- In hobbicast@yahoogroups.com, Jim <jimmy163333@...> wrote:
              >
              > Is that frequency high enough for induction heating? I thought it had to be much higher than that.
              > Jim
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