Armature hole

Discussion in 'General Electronics Chat' started by banzai, Jul 25, 2014.

  1. banzai

    Thread Starter Member

    Jan 3, 2014
    71
    0
    Hi

    what is the purpose of these three holes on the armature ??

    [​IMG]

    The armature is from a universal motor used in a electric drill
     
  2. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    Metal removal for balancing armature.
     
    banzai likes this.
  3. tom_s

    Member

    Jun 27, 2014
    285
    333
    pedantic response :)

    rotor is wound soldered and epoxy applied, then sent to a balancing machine for a 'wheel' alignment. anything that spins and has a some mass needs to be balanced.
     
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