樱花影视

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Faculty of Graduate Studies

Christian Espinoza

  • BSc (Escuela Superior Politécnica Del Litoral, 2007)

  • M.P.M.(Escuela Superior Politécnica Del Litoral, 2014)

Notice of the Final Oral Examination for the Degree of Master of Applied Science

Topic

Impact of Pulse Width Modulation Schemes In ii Eccentricity Fault Detection Using Current Signature Analysis

Department of Electrical and Computer Engineering

Date & location

  • Tuesday, December 16, 2025

  • 10:30 A.M.

  • Virtual Defence

Reviewers

Supervisory Committee

  • Dr. Ilamparithi Thirumarai Chelvan, Department of Electrical and Computer Engineering, 樱花影视 (Co-Supervisor)

  • Dr. Navneet Popli, Department of Electrical and Computer Engineering, UVic (Co-Supervisor) 

External Examiner

  • Dr. Jaya Prakash Champati, Department of Computer Science, 樱花影视 

Chair of Oral Examination

  • Dr. Catherine Costigan, Department of Psychology, UVic 

Abstract

Among various motor issues, eccentricity faults pose significant challenges, leading to vibrations, reduced efficiency, and potential failure if undetected. Motor Current Signature Analysis (MCSA) is a widely used technique for diagnosing such faults, particularly in line-fed motors. However, the effectiveness of MCSA based on the modulation scheme employed in inverter-driven setup is underexplored. This thesis addresses this gap by analyzing the impact of Sinusoidal Pulse Width Modulation (SPWM) and Selective Harmonic Elimination (SHE) on diagnosing eccentricity faults in three-phase synchronous motor drives.

The study involves a three-phase, 2 kW, 208 V, 1800 rpm synchronous motor driven by an inverter, which is controlled via a Raspberry Pi Pico2 microcontroller. Using Sinusoidal PWM (SPWM) and Selective Harmonic Elimination (SHE) modulation schemes, the research examines their influence on motor current signatures, focusing on harmonic distortion and the detectability of eccentricity faults. A comprehensive experimental setup is developed to analyze both healthy and fault-induced conditions with varying eccentricity levels. Current signals are processed through Fast Fourier Transform (FFT) to extract fault-relevant spectral features and assess the sensitivity of each modulation method. The results emphasize the differences in the frequency spectra produced by pulse-width modulation systems, uncovering unexpected behaviors and trends as eccentricity increases. They also demonstrate how much easier it is to observe the magnitude and growth of specific fault frequencies when the system is connected directly to the electrical grid, compared to when it operates under pulse modulation schemes.

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