Electric motor monitoring
In every industrial plant there are critical electric motors that must be [...]
In every industrial plant there are critical electric motors that should be monitored to be on the alert for potential problems that could interrupt production.
Failure modes
Vibrations in electrical machines can have a mechanical or electrical origin. Symptoms for diagnosing faults of electrical origin can be found in the vibration spectra or in the dynamic current or voltage signal of the motor in each phase. Problems of electrical origin detectable with vibration, current and voltage analysis techniques can be classified into six fault zones:
- Power quality problems, detectable by power test.
- Power circuit faults, detectable by standard tests and power test.
- Insulation defects, detectable by standard test, polarization index and step voltage test.
- Stator faults, detectable by standard test, rotor influence, power test and start-up test.
- Rotor failures, detectable by vibration analysis, standard test, rotor influence test, rotor evaluation and start-up test.
- Air gap defects, detectable by vibration analysis, standard test, rotor influence and eccentricity test.
More technical information here.
Monitoring systems
The recommended monitoring systems for electric motors are:
Equipment for offline measurements: Monitoring of failure mode parameters by means of periodic vibration paths with portable equipment.
Online monitoring systems: Continuous monitoring and diagnosis of vibration, voltage and current.
Related links:
- Electric motor diagnostic services.
- Course on predictive maintenance of electric motors.
- ROI analysis.
Contact our sales department at info@preditec.com to request a proposal for monitoring your machinery.
