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need HD spindle motor driver

Discussion in 'Electronic Basics' started by Jim, Aug 16, 2008.

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  1. Jim

    Jim Guest

    I have a number of small spindle motors salvaged from old hard drives that
    have only 3 connections. As far as I can tell using my VOM, the 3 coils do
    NOT have a common ground connection......or at least I can't find one.

    Can someone describe how the 3 coils of this type of (brushless) motor are
    driven to make the motor run? I am familiar with HD motors having 4
    connections, and there are a number of handy DIP IC's to run this type of
    spindle motor, but is there an equivalent IC for use with these 3 coil HD
    motors?

    Thanks
    Jim
     
  2. Sjouke Burry

    Sjouke Burry Guest

    It is a 3 phase motor, feed them with some voltage approximating
    that, and it will turn, even if you use square waves, if each
    is shifted 1/3 period.
    The center point to which the 3 windings are connected, can be
    floating.

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