HELP on DC Generator (1 Viewer)

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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?
 

Attachments

well its either the one or the other, the generator or the voltage indicator, thry the indicator on a electric motor.
 

berkeman

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

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