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Induction Motors: 110V vs 220V

Discussion in 'Electrical Engineering' started by – Colonel –, Jan 27, 2008.

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  1. I have a question for the engineers/scientists out there.

    I have a table saw with a 1.5hp induction motor (TEFC) that can be
    wired for either 110V or 220V. It's currently wired for 110V
    single-phase AC.

    I remember my father used to rewire his table saw's motor, changing it
    to 220V. He said he didn't think doing so gave it any more power; it
    just gave it more "snap" in getting started quickly.

    Here's my question: In an application where an induction motor was
    pushed close to its power limit (i..e., 1.5 horsepower) in a
    continuous-duty application, or even an intermittent-load situation,
    wouldn't wiring it to run on 220V be better than 110V if you were
    concerned about thermal overload?

    I don't entirely understand how an induction motor works, but it seems
    that if you double the voltage, you're going to cut the heat-producing
    amperage in half in the windings, and thus the motor will run "cooler"
    at the higher voltage.

    Am I anywhere close to correct here?

    Are there other/any advantages to wiring a table saw motor to run on
    220V as opposed to 110V?

    Thanks for any feedback.
     
  2. No. Most likely it has two windings which can be connected
    in parallel for 110V or series for 220V. It makes no
    difference to the motor.
    Yes, 220V will only draw half the current, which equates
    to only a quarter of the resistive losses in the supply
    wiring. This will mean the motor can draw a larger surge
    without losing so much of it in the supply wiring losses.
    Also, on a US 120-0-120V supply, you are balancing the
    load across both legs, rather than dragging it all from
    just one side, which might result in less noticable sags
    and spikes for other appliances (lighting in particular).
     
  3. OK, thank you, Andrew, for the info.
     
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