This paper describes a new analytical model for the influence of rolling-element bearing faults on induction motor stator current. Bearing problems are one major cause drive failures. Their detection is possible by vibration monitoring characteristic frequencies. As it to detect other machine current, great interest exists in applying same method fault detection. After presentation existing model, detailed approach proposed. It based following two effects fault: 1. introduction particular...

We have developed a method to analyze in detail, translocation events providing novel and flexible tool for data analysis of nanopore experiments. Our program, called OpenNanopore, is based on the cumulative sums algorithm (CUSUM algorithm). This an abrupt change detection that provides fitting current blockages, allowing user easily identify different levels each event. detects using adaptive thresholds adapt low-frequency variations baseline. After event identification, our uses CUSUM fit...

A new method for voltage dips and swells analysis is presented in this paper.This based on the space vector representation complex plane zero-sequence voltage.Indeed, case of nonfaulted system voltages, follows a circle with radius equal to nominal voltage.It same shape balanced dips, but smaller radius.For unbalanced becomes an ellipse parameters depending phase(s) drop, dip magnitude phase angle shift.For not modified, though presents significant changes its can be used analysis.The are...

A high-throughput fabrication of sub-10 nm nanogap electrodes combined with solid-state nanopores is described. These devices should allow concomitant tunneling and ionic current detection translocating DNA molecules. We report the optimal parameters in terms dose, resist thickness, gap shape that easy reproduction process at wafer scale. The device noise voltage characterizations performed influence nanoelectrodes on identified. In some cases, rectification for connected or biased also...

Electrical impedance measurements provide useful information about the characteristics of a Li-ion battery. The classical method measurement consists performing electrochemical spectroscopy (EIS) that relies on offline records response battery to controlled current or voltage test signal. Although robust, it is considered as an expensive, complex, and very time-consuming method, particularly when used for embedded system where new whole set should be carried once tracked. To overcome these...

IIn this contribution, we apply our newly developed ball-milling operando platform, which combines Raman spectroscopy, thermal (IR) imaging, as well acoustic and high-speed optical video recordings, to the synthesis transformation of citric acid – isonicotinamide (1 : 2) cocrystal polymorphs in transparent PMMA jars. Particularly, demonstrate how Raman, temperature, data are complementary enable detect connect together chemical physical events happening during a time-resolved manner....

In this contribution, we apply our newly developed ball-milling operando platform, which combines Raman spectroscopy and thermal (IR) imaging, as well acoustic high-speed optical video recordings, to the synthesis transformation of citric acid–isonicotinamide (1:2) cocrystal polymorphs in transparent PMMA jars. Particularly, demonstrate how Raman, temperature, acoustic, data are complementary enable detection connection chemical physical events happening during a time-resolved manner....

This paper describes new models for the influence of rolling-element bearing faults on induction motor stator current. Bearing problems are one major cause drive failures. Their detection is possible by vibration monitoring characteristic frequencies. As it to detect other machine current, a great interest exists in applying same method fault detection. After presentation existing model, detailed approach proposed. It based two effects fault: introduction particular radial rotor movement and...

This paper shows the reliability of fault detection on electrical machines by analysis low frequency magnetic stray field. It is based our own experience about discretion naval propulsion machine. We try to apply techniques developed in previous works subject faults detection. In this we focus rotor defaults a synchronous generator (eccentricity and short-circuit rotor). Two kinds study are performed. The first one numerical. Firstly, an adapted finite elements method used compute field...

In this paper, we propose to perform early fault diagnosis using high-resolution spectral analysis of the stator current detect bearing faults in electrical induction machine. While most research works focus on mechanical vibration analysis, originality our work relies use methods modulations current. We present results obtained for real data inner and outer raceway defects made articially as well through on-site ageing. The show that proposed method yields better detection than classical...

In this article, a novel sensorless control for permanent magnet synchronous machine (PMSM) using its radiated acoustic noise is proposed in which high-frequency voltage signal superimposed upon the fundamental excitation and response to such studied. First, analytical equations describing field formation within airgap leading generation of radial forces are extensively investigated. next step, resulting harmonics waveform caused by injected signals predicted. Then it experimentally verified...

A new method is presented to identify and characterize voltage dips measurements from power quality survey. This based on the space vector transformation, which describes three system voltages by one complex variable - vector. Its representation in plane used classify dips. Indeed, for a not disturbed voltages, represents circle with radius equal nominal voltage. It follows same shape balanced dips, but smaller radius. For unbalanced this becomes an ellipse parameters depending phase(s)...

In this paper, a new approach for the analysis of three-phase electrical signals is considered. While most existing techniques are based on fixed transforms such as Clarke transform, paper investigates use data-driven called singular value decomposition (SVD). As compared to other transforms, shows that SVD has distinct advantage clearly separating contributions phasor configuration and signal instantaneous parameters. Under additive white Gaussian noise, also describes several algorithms...

This paper presents a DSP method that allows decomposing conducted electromagnetic interference (EMI) emissions from different sources in large power electronics systems. The estimation process is carried out by number of Wiener filters (WFs), which represent all converter states. These are determined initial commutation event conditions and propagation paths layout. Filters fed semiconductor switch voltage or current waveforms regarded as perturbation. EMI measured on the line impedance...

This article introduces an injectionless approach for acoustic-noise-based sensorless control of the permanent magnet synchronous machine. Replacing high-frequency injection, pulsewidth modulation (PWM) voltages are used as basis method implementation. The mathematical model PWM with considering deadtime effect is first presented. Then, its impact upon harmonics current, magnetic fields, and generated radial forces detailed. It experimentally verified that in presence deadtime, unlike...

Electrochemical impedance spectroscopy or ac methods are popularly used for the diagnosis of electrochemical generators (batteries fuel cell). It is now possible to acquire and quantitatively interpret experimental electrical impedances such systems, whose evolutions indirectly reflect modifications internal process. The scope these measurement identify frequency response function system under test by applying a small signal perturbation input, measuring corresponding response. Once...