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vibrating DC motor

Discussion in 'Electrical Engineering' started by Guy S., Dec 14, 2005.

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  1. Guy S.

    Guy S. Guest

    I just bought a 1/2 hp dc motor to replaced a smaller one
    who was working well except it overheated after a while.
    the motor is driven by a KB scr drive.
    When free running everything seem well, it vibrate on start but pick up
    its speed and is eventually humming.
    when the work load is attached, there is a strong vibration shaking
    the whole thing.
    no matter what speed the pot is ajusted, it ring loudly.
    i tried another drive, also SCR drive, from another manufacturer and it
    seem even worst.
    i took the motor to the repair shop they put it on a test and
    everything is ok,
    they say there must be a match between some motor and some scr drives.
    well how to do that?
    i would like better to understand what is going on anr fis the mismatch
    by adding perhaps a condenser or a choke or a combination or modifying
    the brushes or what....

    can some one help me on this one?
     
  2. This is going to be a tough one to diagnose over the usenet.

    Its possible that the new, larger motor is stiffer, from a control
    systems point of view. The interaction between the speed control drive,
    the motor and the mechanical load might be operating nearer a resonant
    point.
     
  3. not i

    not i Guest

    Check the IR compensation setting on the controller.
     
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