Javier A. Rosero

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The latest advances in electric and electronic aircraft technologies from the point of view of an "all-elect~ric" aircraft are presented herein. Specifically, we describe the concept of a "More Electric Aircraft" (MEA), which involves removing the need for on-engine hydraulic power generation and bleed air off-takes, and the increasing use of power(More)
This paper presents and analyzes a method for shortcircuit fault detection in a permanent-magnet synchronous motor (PMSM). The study includes steady-state condition and speed transients in motor operation. The stator current is decomposed by empirical mode decomposition (EMD), which generates a set of intrinsic mode functions (IMFs). Quadratic(More)
This paper presents a new approach for the current acquisition system in motor fault detection applications. This paper includes the study, design, and implementation of a Rogowskicoil current sensor without the integrator circuit that is typically used. The circuit includes an autotuning block able to adjust to different motor speeds. Equalizing the(More)
In this work the voltage distribution in transformers windings is calculated using equivalent circuit with constants elements that are able to model the frequency dependence. FEM is used to estimate resistances and inductances of equivalent circuit in relation with frequency. The behaviour of R and L are approximate to rational functions with Vector Fitting(More)
This paper calculates resonances in transformer windings, using a network of equivalent circuits, magnetically coupled. Inductive and resistive parameters of these circuits are calculated of a new form using vector fitting algorithm, through simulations and impedance measurement. It also includes a physical interpretation of the circuit model used, and the(More)
This paper presents an analysis of effects of dynamic air-gap eccentricity on the performances of a 6/4 Switched Reluctance Machine (SRM) through finite element analysis (FEA) based on a FEMM package associated to MATLAB/SIMULINK package software. Among the various Time-Frequency methods used for detection of defects, the Time-Frequency Representation (TFR)(More)
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