Troubleshooting Weak Stepping Motors | Tips for Maintaining Optimal Performance

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SUMMARY

The discussion centers on troubleshooting weak performance in 12 amp 1.8 degree stepping motors. Users report that despite checking bearings, windings, and insulation integrity, motors occasionally exhibit weakness. The primary suspect for this issue is the potential presence of shorted turns in the rotor, which can absorb significant energy without altering resistance readings. This highlights the importance of thorough diagnostics beyond standard checks to identify underlying magnetic issues.

PREREQUISITES
  • Understanding of stepping motor specifications, particularly 1.8 degree step angles.
  • Familiarity with electrical resistance measurements in motor windings.
  • Knowledge of rotor magnetism and its impact on motor performance.
  • Experience with motor disassembly and inspection techniques.
NEXT STEPS
  • Investigate methods for testing rotor magnetism in stepping motors.
  • Learn about the effects of shorted turns on motor performance and energy absorption.
  • Research advanced diagnostics for electric motors, focusing on electromagnetic analysis.
  • Explore maintenance techniques to prevent stepping motor performance degradation.
USEFUL FOR

Engineers, technicians, and maintenance professionals working with stepping motors, particularly those involved in troubleshooting and optimizing motor performance in industrial applications.

alhughes
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Where I work we have 12 amp 1.8 degree stepping motors, occasionaly a motor will go weak, we change motors and all is good, when i strip the motors to check, the bearings are fine, the windings are fine, correct resistance, no insulation breakdown to Earth or between windings, so what causes the weakness? the only thing I can't check is the magnetism of the rotor, any clues?
 
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A possibility is a single shorted turn or two. That can soak up a lot of energy but not change the resistance much.
 
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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