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  • JackShaft

    I have an old motor which I'm thinking of using as a jackshaft for a speed reducer. Do I need to do anything (other than unplug it) to avoid creating electrical or other problems? Thanks in advance for your thoughts. Shel

  • #2
    I believe it could turn into a generator but as long as there is no wires hanging out you should be OK. I take it it is a double shaft motor?

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    • #3
      if its an permanant magnet dc motor it will produce current, if so pull brushes if its an ac it shouldnt do anything. hmm wild thought if its an pm dc motor put a resistor and a proper sized switch and you have a braking system! pigpen

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      • #4
        An AC motor WILL also produce current....All motors will if driven. However, unlike a DC motor it won't produce as much power, but still enough to get your attention.

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        • #5
          whats exciting it? residual magnatism? pigpen

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          • #6
            Adgo,

            Incorrect, an AC motor will NOT generate unless excited as pigpen implies. If there is a small residual magnetic field there may be some generation, but it will be very small. Now a PM DC motor.... watch out

            Robin
            Robin

            Happily working on my second million Gave up on the first

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            • #7
              Incorrect Some AC motor designs can generate power with no excitation.

              A couple capacitors need to be added...

              Residual magnitisim will work...
              This example will not power another motor but works well with resistive loads:

              http://www.qsl.net/ns8o/Induction_Generator.html
              Last edited by Bguns; 03-04-2010, 02:51 AM.

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              • #8
                Adgo, Bguns...

                I stand corrected...

                Robin
                Robin

                Happily working on my second million Gave up on the first

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                • #9
                  Originally posted by rdfeil
                  Adgo, Bguns...

                  I stand corrected...

                  Robin
                  Really? I sit when I type.

                  Steve

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