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AC MOTOR WIRING HELP??

Discussion in 'General Electronics' started by Jason, Sep 2, 2003.

  1. Jason

    Jason Guest

    I have a fan and motor i baught from an auction and need help wiring
    it. The info on the motor is as follows:

    Skurka Engineering Co.
    Motor, AC
    Volts 115
    Amps 0.5
    H.P. 1/50
    Phase 1
    HZ. 60
    R.P.M. 3300
    Cap. 4MFD

    There are three wires coming from the motor to a plug mounted on the
    fan body. Two of the wires are mounted to a fat pin: the white and
    green. The third wire is connected to the skinny pin: black. This is
    all the info I have on the motor/fan.
     
  2. Nirodac

    Nirodac Guest

    Is there a capacitor somewhere in the picture. The rating plate says it
    should be 4mfd.
    If I under stand your description of the wiring, two wires are connected
    together (white and green) and go to one side of the plug, and the black
    wire goes to the other side of the plug. In some countries, white is
    neutral and green is ground, these wires would go to separate connectors on
    a three prong plug. Green to a round connector and the white to a slightly
    wider flat connector. The black would then go to a slightly narrower flat
    connector. Back at the breaker panel the white and green wires would be
    connected together (usually). What's confusing me is the capacitor, it
    needs to be in the circuit somewhere, usually common to one of the power
    rails, and connected to an individual wire in the motor.

    Ray
     
  3. Jason

    Jason Guest

    I do not see a capacitor anywhere on the motor. The three wires are in
    one common rubber casing that come directly out of the side of the
    motor housing. The motor housing is a sealed, slightly finned (or
    ribbed), aluminum case held together with four screws. There could be
    a capacitor in there, I don't know. The three wires are connected to
    three pins, not two. All three wires are insulated from one another at
    the plug and though the rubber casing into the motor.The two larger
    pins are on the ends of the white and green wires. The third smaller
    pin is connected to the black wire. I am in the U.S.if this helps any.
    The fan is millitary suplus or out of an aircraft I think. The three
    pins are part of the male portion of what looks like a two piece
    circular plug. The same type used in aviation in some aplication. A
    quarter twist then pull apart kind. The plug size is the diameter of a
    nickle.($.05)I hope this helps discribe the wiring situation a little
    more clearly.
     
  4. Nirodac

    Nirodac Guest

    My guess is that a 4 mfd capacitor should be attached to two of the wires
    and that two of the wires should be attached to the 117 volts AC.
    One lead, is power only, one lead is capacitor only, and one lead is common
    to the capacitor and the power rail. Taking a big guess here, the smaller
    black wire is probably the capacitor only lead, the green and the white
    would then go to the power rail (the other end of the capacitor would be
    attached to either the white or the green lead). The capacitor is a special
    AC capacitor and would be rated at several hundred volts. You can get them
    at some appliance repair shops or motor repair shops.
    Aircraft used to use 400Hz for the frequency of the power. This reduced the
    size of coils, inductors, and motors.
    Because the rating plate said 117 volts 60 cycle, you should be able to plug
    it into a standard US outlet (once you figure out where the cap goes).
    If your unsure about plugging it into 117 VAC, place a 60 or 100 watt
    incandescent lamp in series with the motor, if the motor shorts out, the
    lamp will glow brightly (full brightness), but nothing will be damaged in
    the motor.

    Ray
     
  5. JeffM

    JeffM Guest

    I have a fan and motor...need help wiring it.
    Nice pictures & basics here:
    http://www.motorsanddrives.com/cowern/motorterms1.html

    You have to figure out how to get the Start capacitor
    in series with the Start winding for a boost on takeoff.
    If the Run winding and the Start winding have a common return,
    an ohmmeter with good resolution
    should let you find this mid-point.
     
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