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  1. harry641

    If DC generator excited by AC

    I am testing DC traction motors which being supplied by two series Dc generators,when I am testing at High vlotage 1000 v 250 A most brushes start sparking If we suppose ARM,interpoles and brush boxes alignments are OK, you reckon it could be dc vlotage control board which exciting main DC...
  2. harry641

    If DC generator excited by AC

    If a DC generator excited by AC , you think will affect DC out put?

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