Help on DC TachoGenerator: Troubleshooting High/Low Voltage Issues

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SUMMARY

The discussion centers on troubleshooting a DC TachoGenerator that exhibits inconsistent voltage readings based on the direction of shaft rotation. When rotated clockwise (CW), a stable positive voltage is observed, while counterclockwise (CCW) rotation initially produces a negative voltage that gradually decreases to zero despite continued rotation. The issue may stem from either the TachoGenerator itself or the voltage indicator used in conjunction with an electric motor. Participants suggest examining the TachoGenerator's construction and utilizing an oscilloscope to analyze the output waveform for further diagnostics.

PREREQUISITES
  • Understanding of DC TachoGenerator operation
  • Familiarity with voltage measurement techniques
  • Basic knowledge of electric motor systems
  • Experience with oscilloscopes and waveform analysis
NEXT STEPS
  • Investigate the construction and working principles of DC TachoGenerators
  • Learn how to use an oscilloscope for output waveform analysis
  • Research common issues with voltage indicators in electric motor applications
  • Explore troubleshooting techniques for DC motor systems
USEFUL FOR

Engineers, technicians, and hobbyists working with DC TachoGenerators, electric motor systems, or anyone involved in troubleshooting voltage measurement issues in rotational devices.

dimitrive
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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?
 

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well its either the one or the other, the generator or the voltage indicator, thry the indicator on a electric motor.
 
Do you know how the "tachogenerator" is constructed? Have you looked at its output with an oscilloscope?
 

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