The goals of this paper are (1) to improve the effectiveness of IDDQ testing, and (2) to find the characteristic current signature for every defect class. Current signature analysis was performed for the IDDQ data collected on the Murphy test chip. A "total variance" method is proposed to reduce the test escape of IDDQ testing. Compared to the other three IDDQ testing methods, it has the lowest...

Director and Consultant with EM Diagnostics Ltd., in Alford, Aberdeenshire, Scotland, since August 2001. He has 42 years’ experience covering the installation, maintenance, design, performance, and condition monitoring of electrical drives. Professor Thomson has worked as electrician, R&D engineer, academic, and consultant. In 1990, he was appointed Professor at Robert Gordon University in Aber...

The ability to monitor the condition of an electrical machine has been a concern of industry for many years. Knowing when a machine requires maintenance allows users to perform the required maintenance at their convenience, rather than during costly unscheduled shutdowns. This need for improved industrial monitoring techniques has produced a number of studies on the detection of mechanical faul...

This paper focuses on experimental results to prove that motor current signature analysis (MCSA) can diagnose shorted turns in low voltage stator windings of 3-phase induction motors using LabVIEW. The diagnostic strategy is presented and variables that influence the diagnosis are discussed. Current spectra from motors with short-circuited turns (with and without short circuit current limiting ...

The gear faults are time-localized transient events so time-frequency analysis techniques (such as the Short-Time Fourier Transform, Wavelet Transform, motor current signature analysis) are widely used to deal with non-stationary and nonlinear signals. Newly developed signal processing techniques (such as empirical mode decomposition and Teager Kaiser Energy Operator) enabled the recognition of...

Failure of induction motors are a large concern due to its influence over industrial production. Motor current signature analysis (MCSA) is common practice in industry to find motor faults. This paper presents a new approach to detection and diagnosis of motor bearing faults based on induction motor stator current analysis. Tests were performed with three bearing conditions: baseline, outer rac...

Broken rotor bars in induction motors can be detected by monitoring any abnormality of the spectrum amplitudes at certain frequencies in the motor current spectrum. Broken rotor bar fault detection schemes should rely on multiple signatures in order to overcome or reduce the effect of any misinterpretation of the signatures that are obscured by factors such as measurement noises and different l...