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Related Concept Videos

Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Updated: Dec 9, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Mechanical Fault Diagnostic in PMSM from Only One Current Measurement: A Tacholess Order Tracking Approach.

Abdallah Allouche1, Erik Etien2, Laurent Rambault2

  • 1LaSIE Laboratory UMR CNRS 7356, University of La Rochelle, 17042 la Rochelle, France.

Sensors (Basel, Switzerland)
|September 9, 2020
PubMed
Summary

This study introduces a novel mechanical fault diagnosis method for synchronous machines using just one current signal under variable speeds. The technique simplifies analysis and enables accurate fault detection even with limited measurements.

Keywords:
PMSM diagnosticmotor current analysisstatistical approachtacholess order trackingvariable speed

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Area of Science:

  • Electrical Engineering
  • Mechanical Engineering
  • Signal Processing

Background:

  • Mechanical fault diagnosis in synchronous machines is crucial for operational reliability.
  • Traditional methods often require multiple sensors or fixed operating speeds.
  • Variable speed operation complicates traditional fault diagnosis techniques.

Discussion:

  • The proposed methodology employs order tracking, sampling signals based on rotor angle for speed independence.
  • It uniquely estimates rotor position and rotational speed from a single current measurement.
  • This approach simplifies spectral analysis, making it suitable for variable speed conditions.

Key Insights:

  • A robust fault diagnosis protocol is developed using a statistical approach.
  • The method successfully overcomes the challenges of diagnosing faults at variable speeds with minimal sensor data.
  • Validation through simulations and experimental setups confirms the methodology's effectiveness.

Outlook:

  • Potential for enhanced predictive maintenance strategies in industrial synchronous machines.
  • Further research could explore application to other types of rotating machinery.
  • Integration with real-time monitoring systems for immediate fault alerts.