180VDC Motor

Discussion in 'General Electronics Chat' started by mike K, Jan 28, 2011.

  1. mike K

    Thread Starter New Member

    Jul 31, 2010
    6
    0
    I have a problem with a 1 H.P. Permanent magnet 180 VDC motor. It was installed on a 90 VDC drive. Is there any reason it would overheat and burnout the motor. It did and I dont know why.
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,795
    951
    one horsepower is approx. 750 watts of electric power.

    if the motor tries to give you 1 HP it must, by definition, use 750 watts of electric power.

    If the voltage is halved, then current must be doubled.

    180 volts at 4.167 amps is 750 watts.

    90 volts at 8.32 amps is 750 watts.

    The motor overheated due to excessive current flow. The wire which it was wound with was sized so that it could handle the 4 amps of current and not exceed its temperature rating.
     
  3. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    Same as above, but more specifically, it burnt out because you did not set up the current limit properly, and probably increased the fuse sizes when they blew.
     
  4. mike K

    Thread Starter New Member

    Jul 31, 2010
    6
    0
    It makes sense. The 90vdc motor has a 10.3 A rating, where the 180v has 5A. I suppose I could have set the currant limit to 5A but would have only developed 1/2 the horsepower.
     
  5. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
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    Better than zero as it does now. Live and Learn. I melted down a power transformer only last week because I fused for the drive at the request of production, realizing that the transformer was under rated.
     
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