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HELP on DC Generator

  1. Feb 8, 2006 #1
    Hi
    I need a help. I do have a DC TachoGenerator whereby i can measure the DC voltage if the shaft rotates.
    The problem is:
    When I rotate the shaft at CW, I got a fixed plus voltage.But when i rotate to CCW, the voltage is minus but slowly later it decrease to zero. (even the shaft still rotating)
    Why?
     

    Attached Files:

  2. jcsd
  3. Feb 8, 2006 #2
    well its either the one or the other, the generator or the voltage indicator, thry the indicator on a electric motor.
     
  4. Feb 8, 2006 #3

    berkeman

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    Staff: Mentor

    Do you know how the "tachogenerator" is constructed? Have you looked at its output with an oscilloscope?
     
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