Problem with understanding motor construction

Discussion in 'General Electronics Chat' started by Vlad Condrea, Apr 14, 2016.

  1. Vlad Condrea

    Thread Starter New Member

    Feb 27, 2016
    5
    1
    Hello guys,
    I'm a real beginer in electronics empire. I have a motor taken from an automatic garage door opener, and unfortunately I don't know what type of motor is this one. It has 4 wires coming out of the motor, I had no clue which is what, so I removed the cover to see where the cables lead.
    Please see attached images.
    Can you please tell me what type of motor is it, and where I can find more information about it ? IMG_20160414_200133_HDR.jpg IMG_20160414_200150_HDR.jpg IMG_20160414_200214_HDR.jpg IMG_20160414_200232_HDR.jpg
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,047
    The owner's manual can be a good place to start. If you're lucky the part number will then cross reference to a number of sources. For instance a Whirlpool dishwasher might share a motor with models from Kenmore and GE. Then you search around for the best price.

    Oh wait, you didn't say you were replacing it.
     
  3. Vlad Condrea

    Thread Starter New Member

    Feb 27, 2016
    5
    1
    Actually I don't want to replace it , I want to use it for other purposes. So I want to wire it correctly.
    To be honest with you, I have 2 of them, and I've burned the plate on one of them ))
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
    2,370
    Normally they are 1ph induction motors with identical fields making it easy to reverse, and the pic show a 50μf cap which could confirm it.
    Most garage door openers in N.A. are made by Chamberlain.
    Max.
     
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  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
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    This is the way it is normally done with two identical windings.
    [​IMG]
    Max.
     
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    looks to me like a universal motor, 6 wires, two sets of field coils(red, green) and a set of brushes (black,white), with a spring earth contact.


    Motor
     
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  7. Vlad Condrea

    Thread Starter New Member

    Feb 27, 2016
    5
    1
    Thank you very much guys, now I have a lot to learn and to read.
    Electronics is awesome !
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That is what I suspected at first, but the large value caps and the fact that a Universal motor is not a good choice for a garage door opener made me doubt it.
    If the OP confirms it has brushes, then it does point to Universal.;)
    Max.
     
  9. Vlad Condrea

    Thread Starter New Member

    Feb 27, 2016
    5
    1
    I suppose it has brushes, please take a look at the attached images.
    So that means that it is an universal motor ?
    IMG_20160414_211831.jpg
     
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  10. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
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    Pretty much confirms it.
    The series field windings are reversed with respect to the armature pair to reverse the motor.
    I assume all those caps are for suppression?
    Max.
     
  11. Vlad Condrea

    Thread Starter New Member

    Feb 27, 2016
    5
    1
    Here is one more image about the motor specs, I have only this, writen on it's gear box.
    Regarding the caps, the construction is like this : there is a plate(you can see the image attached in first message), the metalic cap was touching the plate, and this plate was connected to one pair of red and green wires. The other pair of red and green wires are coming outside the motor, as well as the black and white wires.
    I'm sorry I didn't mention all this information earlier.

    Kind regards,
    Vlad
     
  12. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    yep its a universal motor, with a plastic housing, hence the earth brush.
     
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  13. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
    2,370
    One thing to be aware of with a Universal motor, they are made to have some kind of load at all times when running, as they operate in a runaway condition when simply powered with no load.
    Load keeps the rpm within safe operating range.
    Max.
     
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