dc motors

Discussion in 'General Electronics Chat' started by macataq, Dec 15, 2007.

  1. macataq

    Thread Starter Member

    Sep 15, 2007
    11
    0
    hi
    i recently picked up a few permanent DC motors at a farm auction, (they grouped a bunch of them together with the one i actually wanted) and i would like to know how to go about testing them to find out the voltage/amperage of these motors since they have been painted and there are no labels or stampings any where on them. only + and -
    what equipment will i need to do this testing?
    any help would be appreciated.

    edit; here are pics

    http://img143.imagevenue.com/img.php?image=64372_motor_122_765lo.jpg
    http://img104.imagevenue.com/img.php?image=64371_motor_001_122_1063lo.jpg


    thanx

    Mac
     
  2. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    There is no specific equipment for that. Your option here is to test it with several voltages.

    Can you post detailed pictures of the motor, so we can see the type?
     
  3. macataq

    Thread Starter Member

    Sep 15, 2007
    11
    0
    hi thank you for responding
    i have tried to attached images,but they are too big.
    i erred in my previous post
    the terminals are not marked + and - , but rather A1 and A2
    with the A1 terminal also has "CW" (assuming this is clockwise)
    stamped on it. dont know if this helps, but the motor is 4.5" DIA and 6.5" long
    weighs 12. 25 lbs
    any advice or assisatance is appreciated.

    thanks again

    Mac
     
  4. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    It is going to be tough ask to determine the voltage and amperage ratings of any appliance
    even transformers. the ratings are determined by the insulation ad heat handling of the appliance.
    if u are having difficulty with uploading of images...try uploading them at a image hosting site and provide its link here.
    Some experienced members here may be able to guess the ratings if u can tell what application were they intended for originally.
     
  5. macataq

    Thread Starter Member

    Sep 15, 2007
    11
    0
    hi
    i have added pics, they seem to have went to my first post.
    i do not know the original application for these motors.

    thanx

    MAC
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    From the pictures, one can most definitely tell they are motors. Unfortunately, that's about all the pictures tell.

    I concur with Cumesoftware. Start with a small DC voltage and work your way up until the motor gets too warm. Then back up a notch and record the results.
     
  7. macataq

    Thread Starter Member

    Sep 15, 2007
    11
    0
    LOL Thing
    thanks, i guess i will have to do that. wish i had a variable dc p/s
    lugging batteries in and out of the house is a real pain.

    Mac
     
  8. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    Not the kind of DC motors I would expect to find. Probably these are starting motors that operate at 12VDC, but it is a wild guess.

    I need to add a few more points to that. This method is not very safe, as you may burn the motor by the means of an under voltage. To make sure, test it with a power supply capable of big currents (10A). If the motor rotates too slow or doesn't rotate at all, stop the test and increase the voltage.
     
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