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induction motor basics

Discussion in 'Electronic Basics' started by ssylee, Mar 18, 2008.

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  1. ssylee

    ssylee Guest

    I saw on the nameplate of an induction motor that it contains two sets
    of voltage and current ratings. I'm wondering why that's the case. Any
    explanation of it would be very helpful as I am hard-pressed to find
    it on google. Thanks.
  2. Tim Wescott

    Tim Wescott Guest

    Were they off by a factor of two, or a factor of sqrt(3)?

    Many motors for industrial use can be wired for one of two different
    voltages on installation -- the most common that I know of is to equip
    each pole with two windings that you can connect in either series or
    parallel for, e.g., 220V or 440V service.

    It's also possible (but I don't know how common) to set up a motor to be
    connected in either 'Y' or delta configuration, which would give you a
    sqrt(3) difference.


    Tim Wescott
    Wescott Design Services

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  3. Was it something like 230/460 Volts and 122/61 Amps?
    That would be a dual-voltage motor.

    If different, how about being a bit more specific? For instance, give us the
    motor manufacturer and model number or at least how the data is displayed.

    I can't imagine what you tried searching for that yielded no information,
    but try induction+motor+nameplate. Lots of hits which explain nameplate
  4. Bob Woodward

    Bob Woodward Guest

    Irritating stupid f*** Chinese SPAMMER


  5. Install Newsproxy and use:

    * drop From:** to drop his crap on every newsgroup.

    -- is home to cowards and terrorists

    Add this line to your news proxy nfilter.dat file
    * drop Path:*!not-for-mail to drop all traffic.
  6. Bob Eld

    Bob Eld Guest

    It simply has double windings that can be wired in series for one voltage
    and in parallel for half the voltage. For example, 240 vs. 120 Volts. For
    half the voltage, the current would double.

    The winding connections can be found in the connection box on the motor or
    at one end of the motor depending on size. The leads are ether numbered or
    color coded and there should be a connection diagram, probably on the
    connection box cover plate or the motor name plate that shows how to connect
    for the two voltages.
  7. Jamie

    Jamie Guest

    So you can use it on either or voltage settings..
    It'll show you the wiring diagram you need to perform
    to set it.
    Low/high usually a 230/460 or near that ball park..
    the higher voltages take half the current than that
    of the lower voltage.
    Normally, this is found in AC 3 phase motors and maybe
    a DC shunt motor with 2 voltage fields."
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