Troubleshooting Weak Stepping Motors | Tips for Maintaining Optimal Performance

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Weakness in stepping motors can occur despite intact bearings and windings, suggesting potential issues with rotor magnetism. A possible cause for the performance drop could be a shorted turn in the windings, which may absorb energy without significantly altering resistance. Regular maintenance and thorough inspections are essential for identifying underlying problems. Monitoring the motor's performance and conducting tests on rotor magnetism may help diagnose issues more effectively. Understanding these factors is crucial for maintaining optimal performance in stepping motors.
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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.
 

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