Diagnostically Oriented Experiments and Modelling of Switched Reluctance Motor Dynamic Eccentricity

Area of Science:

• Electrical Engineering
• Mechanical Engineering
• Motor Diagnostics

Background:

• Switched reluctance motors (SRMs) are increasingly used in demanding applications.
• Understanding motor behavior under fault conditions is crucial for reliability.
• Dynamic eccentricity is a common mechanical fault in rotating machinery.

Purpose of the Study:

• To compare experimental and modeling results for SRMs under normal and dynamic eccentricity fault conditions.
• To analyze the impact of dynamic rotor eccentricity on SRM phase current.
• To validate mathematical models against experimental data for fault diagnosis.

Main Methods:

• Experimental testing of an SRM on a test bench.
• Mathematical modeling using quasi-static and dynamic analysis of a 2D geometry model.
• Frequency domain analysis of phase current using Fast Fourier Transform (FFT).
• Time domain waveform comparison.

Main Results:

• Phase current is significantly affected by dynamic rotor eccentricity.
• Modeling results closely matched experimental data for both normal and faulty states.
• FFT analysis effectively identified fault-induced changes in the frequency spectrum of phase current.

Conclusions:

• The research provides a reliable method for diagnosing dynamic eccentricity faults in SRMs.
• Findings can enhance the maintenance and reliability of SRMs in special purpose vehicles, military, and industrial applications.
• Accurate modeling is essential for predicting and mitigating fault effects in SRMs.