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Electric Motor Failure

Discussion in 'Do It Yourself (Not Computer-Related)' started by ED2747, Apr 7, 2008.

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  1. ED2747

    ED2747 Thread Starter

    Apr 7, 2008
    i Have A 1 Hp Capacitor Start Motor That When Energized Will Lock Up And Not Start. The Start Capacitor Has Been Replaced. It Operates A Sears 10" Table Saw And Is 30 Years Old And Has Been Stored, Inactive For Several Years. But Has Been Running Ok For About The Last Month. Rotating After Energizing Results In What I Believe To Be A Magnetic Lock And Hummimg Noise.
    I Intend To Disassemble But Don't Know What To Look For. Any Help Or Ideas Will Be Greatly Appreciated Thanks Ed2747
  2. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

    Nov 28, 2005
    First Name:
    Do you know if the motor has an internal centrifugal switch to disconnect the starter winding as it comes up to speed? An open switch would give you the humming and some shaft vibration.
  3. JohnWill

    JohnWill Retired Moderator

    Oct 19, 2002
    I suspect there is indeed a centrifugal switch in there, older motors frequently had them.
  4. john1


    Nov 25, 2000
    check the windings for continuity.
  5. Zeppfan


    Apr 19, 2006
    Capacitor start single phase motors have two sets of copper wire windings (Coils). One set is for starting the motor and the other is for running at full potential.

    Your motor would have a centrifugal switch in it to remove the start winding from the energy source after it had reached full speed. Then, the run winding keeps it running until the power is shut off.

    The bad news is that your start winding has experienced a short. It is probably cheaper to replace than repair.

    In order to repair it yourself, you would need a full compliment of electric motor repair items, like coated copper wire of the correct size(Circular mils), conductors, winding forms, varnish, bake ovens, and test equipment.
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