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Electric Motor Diagnostics: Small Resistance Variations, Big Impact

When performing power‑circuit analysis on large electric motors, precision bridge measurements often reveal extremely low resistances—sometimes in the milliohm or even micro‑ohm range. These values are highly temperature‑sensitive, yet the relative imbalance between the three phases of a three‑phase induction motor should remain constant. A shift from a .08% to a .8% imbalance may appear minor, but it actually represents a 900% increase, underscoring the critical need for accurate baseline data for reliable trending and comparison.

For another example where a seemingly trivial detail uncovered a major issue, visit The Case of the Broken Bolt on the PDMA website.


Equipment Maintenance and Repair

  1. Electric Motor Testing Tip: Keep Test Leads Clean for Precise Resistance Measurements
  2. Essential Guide: Voltage vs. Resistance Measurements in Motor Troubleshooting
  3. Electric Motor Reliability Tip: Reduce Start‑Up Cycles to Protect Your Equipment
  4. Shaft Currents and Bearing Defects: Expert Solutions to Extend Electric Motor Life
  5. Preventing Rotor Bar Failure: Key Insights on Thermal Expansion and Stress
  6. Leveraging Spectral Band Alarms to Detect Anomalies in Electric Motors
  7. How to Test VFD‑Powered Motors with MCEMAX and Power Analysis
  8. Diagnosing Armature Defects in Running DC Motors: A Practical Guide
  9. Extending Motor Life: Expert Maintenance Tips
  10. Motor Troubleshooting Essentials: Thermal, Electrical, and Insulation Tests to Save Costs