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Brushless DC Motor Controller - Reverse Direction

Discussion in 'Electronic Basics' started by [email protected], Feb 18, 2007.

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  1. Guest

    Hi all,

    Can a brushless DC Motor Controller be used in reverse direction.
    Can it be supplied with an AC input and to generate a DC output... is
    that possible at all or am I being really silly !

    Radil
     
  2. Guest

    I have seen some forum discussion in which this happened.. but can I
    have an explanations of basics of how this Brushless motor controller
    actually works and is it possible that it can run the other way
     
  3. Jamie

    Jamie Guest

    Hmm.
    Brush less DC motors are actually AC motor's in nature.
    depending on the design, they usually have a Delta type
    stator. An optical position index array so that the drive
    and monitor it's position between fields.
    some have PM in the rotors, some don't.
    the controllers can actually fix lock the shaft if it
    wishes, due to the quaddr sensor array, it can act very
    smoothly move the shaft in any direction with in a degree
    of stability..
    they use these motors for long service life and synchronization
    with other moving parts of machines.
    The one's with the PM do get weak over the years due to the
    heat on the rotor breaking down the PM. when this happens, slipping
    starts to take place and timing is out of whack. what we do is increase
    the current in the fields to make up for it, which just adds to the
    problem because more heat them builds up. This last for a few months
    this way. then we finally get around to pulling the motor and sent it
    out for rebuild..
    These motors are not cheap, we 10 Hp Brush less motors that cost 12K
    each.
     
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