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Single phase motor problem

Discussion in 'Electrical Engineering' started by Fred, Feb 10, 2004.

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  1. Fred

    Fred Guest

    I have an old single phase 110V 5.6amp 1/3HP 1200rpm induction motor
    that operates a scroll saw..The motor ran well in the past but now it won't
    start, it just sits there drawing current. If I spin the motor by quickly
    moving the belt it will start.

    It has capacitor start and the cap measures 84 mfd. I'm assuming the cap is
    OK because I can read the value with my capacitance meter.
    I can't read the cap rating printed on the cap clearly but it looks like its
    nominal rating of 72 mfd. Is this reasonable?

    Is there a centrifugal switch that switches out the capacitor when it starts

    Any other ideas what the problem could be?
  2. Fred

    Fred Guest

    Thanks for your reply
    I checked the rear of the motor and there is only the cover for the wire
    conections. Should I remove the rear of the motor itself which
    seems to contain the entire rear bearing assembly?
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