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Wiring Up an AC Motor

Discussion in 'General Electronics' started by Kevin C., Feb 20, 2004.

  1. Kevin C.

    Kevin C. Guest

    I've recently acquired an 1/8 hp AC Motor which I'm trying to hook
    up to see if it is any good.

    The motor is a Dayton Model 3M292 Permanent Split Capacitor (PSC) motor.
    I know it works off of 110 VAC single phase and will pull 1.8 Amps (according
    to the specs). Unfortunately, I can't find any hookup schematics
    (it came with no manual of course).

    The motor has a large capacitor (I presume) which has two wires running
    into the case of the motor. From the case of the motor there are
    four wires to be connected to whatever is driving the motor. They are
    Black, Brown, Blue, and White.

    Two makes sense to me (hook it across a main and see it spin), but I don't
    know why there would be four wires.

    Can anyone with more knowledge of A/C motors give me a hand.

    Thanks,


    Kevin
     
  2. JeffM

    JeffM Guest

    The motor is a Dayton Model 3M292
    Dayton is Grainger's house brand.
    For information: http://www.grainger.com/
     
  3. Like Jeff mentioned Dayton is a brand of Grainger, and a Google search
    for Dayton 3M292 would have turned up this motor in the first few hits.

    So now that you know about the power of Google <g>, here's the relevent
    page:

    http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1611793355&ccitem=

    I was going to suggest the two sets of wires were for different speeds,
    but the specs show just one speed. It does say the motor is CW/CCW
    rotation. The location of the motor on the Grainger site suggest the
    motor is for central heating and air applications, and indeed, you'd
    want a reversible motor for this, to control the direction of the fan
    blade.

    Grainger might be able to provide a PDF of the connection diagram. You
    might ask.

    -- Gordon
    Author: Constructing Robot Bases,
    Robot Builder's Sourcebook, Robot Builder's Bonanza
     
  4. Wade Hassler

    Wade Hassler Guest

    The four wires allow the motor's rotation to be reversed: the main
    winding is connected to 120V with the same colors as the incoming
    line: white-to-white, black-to-black. The capacitor winding is
    connected across the line, too, but can be hooked up either way to
    reverse the spin.


    Look for a wiring diagram stamped into the stator-housing or on the
    underside of the little plate that covers the (laughably small) wiring
    compartment

    Check with an ohmmeter for two wires that read continuity: those are
    the main winding (the capacitor winding will real very high
    resistance.)

    Better yet:
    Talk to Grainger and get the real scoop on this motor. They're Ok
    about this, being a big distributor that wants customers to be happy
    and alive.
    Wade
     
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