Need help wiring 3 speed motor to mains

Discussion in 'Technical Repair' started by accucore12, Nov 19, 2016.

  1. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    How do I connect this three speed motor directly to the electrical mains?


    [​IMG]


    [​IMG]


    The second image is the capacitor connected to the red and brown shown in the first image.

    There are 4 wires connected to the motor coloured white, yellow ,blue and black respectively. White wire has a high speed label. Yellow has a medium speed label and blue has a low speed label.



    I have no knowledge about motors. Hope someone can enlighten me on the

    (1)the type of motor that this is and

    (2)how to connect it directly to the electrical main
     
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    It is an induction motor. The connections are probably (at your own risk!) black to one mains wire and then one of the white, yellow or blue to the other mains wire, which one is connected determines the speed. If you try this, be sure to use a fuse 2A max to limit the volume of the bang if the motor is faulty or my guess at the connections is wrong.
     
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  3. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    Can someone confirm this?
     
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    Try Black to Live
    Any colour to Neutral for speed.

    Put a 2 or 3amp fuse in the live.
     
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  5. Ramussons

    Well-Known Member

    May 3, 2013
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    Maybe you can check the resistances between the 4 wires in a tabular form to be more sure...
    ------------------white-----yellow-----blue-----black
    white-------------0----------x-----------x---------x
    yellow ----------------------0-----------x---------x
    blue -------------------------------------0---------x
    black ----------------------------------------------0

    From these v
    values, one can be more sure.... (presuming that the same gauge wire is used for all windings.
     
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  6. debe

    AAC Fanatic!

    Sep 21, 2010
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    It looks to me like a typical Airconditioner 3 speed fan motor. This is the circuit of my airconditioner Red, yellow & white in this circuit are swiched individualy for each speed & black is common. CIRCUIT..jpg
     
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  7. Ramussons

    Well-Known Member

    May 3, 2013
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    Quite possible.
     
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  8. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    I tried but it does not work, I saw a small spark when trying it.
     
  9. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    The circuitry of the circuit board is not shown. Is there any circuit I can build from scratch to test it using my electrical mains 240v ac?
     
  10. Ramussons

    Well-Known Member

    May 3, 2013
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    129
    Put a 100 watt bulb in series and ignore the starting spark.
     
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  11. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    I measured the resistance using a multimeter after the sparking occurred.

    I kept one side of the multimeter probe to the black wire. The other probe give resistance values as follows(in ohms)
    White. 19.5
    Yellow 215
    Blue too high to be measured (above the 2000k ohm limit of my multimeter)

    The sparking occured when I connected the neautral of mains to the black wire and live of mains to to blue wire. Not sure if it might have affected the measurements.
     
  12. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    Can I use a resistor in place of the bulb and if so
    What value of resistor shd I use?
     
  13. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    ADDED NEW PHOTO
    This is the schematic from the manual of the fan which I salvage this motor from
    [​IMG]
     
  14. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    Did it blow the fuse?
    If not try one of the other speeds.
    It would be good if you can include the series lamp bulb.
     
  15. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    I used a 3A fuse and it seems to be still fine, continuity check still beeps across the fuse.
    In there any thing I can use in place of the bulb?
    I do not have a 100w bulb but I do have a lot of resistors and capacitors.
     
  16. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    A 100W 2.5Ω resistor?
    A 60/40W incandescent bulb?
     
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  17. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Is there a chance it was salvaged for a reason?;)
    Also those capacitors are known to fail, give the shaft a spin when you apply the power and see if it winds up.
    Although it is a PSC motor so it will most likely need a good cap.
    Max.
     
    Last edited: Nov 19, 2016
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  18. accucore12

    Thread Starter New Member

    Mar 15, 2013
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    Does polarity matters for motors? Is it possible that I connect the live and neutral connection in the opposite polarity?
     
  19. MaxHeadRoom

    Expert

    Jul 18, 2013
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    No.
    This one is AC only.
    Your appears to have blk as common.

    [​IMG]
    Max.
     
    Last edited: Nov 19, 2016
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