Viewing 9 posts - 1 through 9 (of 9 total)
  • Anyone know anything about single phase capacitor start induction motors?
  • Premier Icon welshfarmer
    Subscriber

    My planer-thicknesser hasn’t been used for a number of years. Dragged it out today and it refused to start. It did turn slowly a couple of times and then ran but with no power at all. and then wouldn’t even start to turn. I removed the motor and it will start fine on the floor with zero load but even the slightest touch with your toe and it will fail to start spinning. Also noticed that when it does run it sometimes goes clockwise, and sometimes anticlockwise. Could it be that the capacitor has packed in, or will it be something in to the motor itself? Any ideas gratefully received.

    wf

    Premier Icon DickBarton
    Subscriber

    Something about 88mph…I think…

    Premier Icon eskay
    Subscriber

    High probability it is the cap, you should be able to get a replacement cheap enough online.

    Premier Icon jairaj
    Subscriber

    Not a clue about that but in the Hifi world usually if there is an electrolytic capacitor somewhere its to blame. Usually last for years and years but if you have Friday evening job I’ve seen them fail within 5 years.

    So replacing the cap might be a good shout?

    Premier Icon Cougar
    Subscriber

    in the Hifi world usually if there is an electrolytic capacitor somewhere its to blame

    Whatever the world, if the caps are of Noughties vintage then this is highly likely. There is a vast number of caps out there full of shit electrolyte thanks to a curious tale of industrial espionage.

    And if they’re much older than that, they tend to die of natural causes eventually anyway.

    TheBrick
    Member

    Some single phase motors have run capacitor as well as a start cap. Quite often with start caps gone the motor run ok but need a push start. Your symptoms sounds like run cap. If there is just one cap it’s probably a run / start cap combined. Whichever it is make sure you get one of the same farad rating. This is what produces the phase shift to give torque. The voltage is less important as long as it is as high as what it on there already.

    TheBrick
    Member

    P.s if it is only a start cap there is usually a relay that clicks off as the motor increases in speed.

    julians
    Member

    I had to replace the capacitor in the pump motor that I use to feed the shower. It was straightforward and cheap, I just bought another capacitor of the same spec from ebay.

    Premier Icon welshfarmer
    Subscriber

    All very helpful and reassuring. Thanks for all the comments peeps

    Ps bought new around 2002

Viewing 9 posts - 1 through 9 (of 9 total)

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