Browsing by Author "Riba Ruiz, Jordi-Roger"
Now showing items 1-20 of 141
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A 3D-FEM-based model to predict the electrical constriction resistance of compressed contacts
(2017-09-11)
Article
Open AccessThis work proposes a method to estimate the electrical constriction resistance of two mating metallic rough surfaces based on the finite element method (FEM). The FEM-based method generates a random array of three-dimensional ... -
A computer model for teaching the dynamic behavior of AC contactors
(2010-05)
Article
Open AccessAC-powered contactors are extensively used in industry in applications such as automatic electrical devices, motor starters, and heaters. In this work, a practical session that allows students to model and simulate the ... -
A deep learning-based modeling of a 270 V -to- 28 V DC-DC converter used in more electric aircrafts
(Institute of Electrical and Electronics Engineers (IEEE), 2021-07-21)
Article
Restricted access - publisher's policyThis paper presents a novel approach for black-box modelling of 270 V -to- 28 V DC-DC step-down converters used in more electric aircrafts (MEA). These converters normally feed constant power loads (CPL). The proposed deep ... -
A genetic algorithm optimized fractal model to predict the constriction resistance from surface roughness measurements
(2017-06-09)
Article
Open AccessThe electrical contact resistance greatly influences the thermal behavior of substation connectors and other electrical equipment. During the design stage of such electrical devices, it is essential to accurately predict ... -
A revised solution for a sphere rolling in a vertical loop
(2020-09-30)
Article
Open AccessIn this paper the classical well known solution of the elementary problem of the sphere loop in the presence of friction is studied. Also, a modification of the problem shows a possible inaccuracy involved on the well known ... -
An eddy-current-based sensor for preventing knots in metallic wire drawing processes
(2011-04-07)
Article
Open AccessDuring metallic wire drawing processes, the presence of knots and the failure to detect them can lead to long production interruptions, significant economic losses and a lower quality of final product. Consequently, there ... -
An educational tool to assist the design process of switched reluctance machines
(2016-07-13)
Article
Open AccessThe design of electric machines is a hot topic in the syllabuses of several undergraduate and graduate courses. With the development of hybrid and electrical vehicles, this subject is gaining more popularity, especially ... -
An evaluation of the life cycle cost of rapeseed oil as a straight vegetable oil fuel to replace petroleum diesel in agriculture
(2011-08)
Article
Open AccessThe use of straight vegetable oil (SVO) as biofuel has been recognized as a valid substitute of diesel fuel in the agricultural sector under specific circumstances. Its direct use reduces most of the chemical processes ... -
An introduction to fault diagnosis of permanent magnet synchronous machines in master's degree courses
(John Wiley & Sons, 2010-08-16)
Article
Restricted access - publisher's policyEarly fault detection and diagnosis of high-performance electric motors has been an active area of research for the past two decades. This work presents a practical session that facilitates instructing students in this ... -
Analysis and mitigation of stray capacitance effects in resistive high-voltage dividers
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-14)
Article
Open AccessThis work analyzes the effects of the parasitic or stray distributed capacitance to ground in high-voltage environments and assesses the effectiveness of different corrective actions to minimize such effects. To this ... -
Analysis of a smart sensor based solution for smart grids real-time dynamic thermal line rating
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-11-06)
Article
Open AccessDynamic thermal line rating (DTLR) allows us to take advantage of the maximum transmission capacity of power lines, which is an imperious need for future smart grids. This paper proposes a real-time method to determine the ... -
Analysis of capacitance to ground formulas for different high-voltage electrodes
(2018-01-01)
Article
Open AccessStray capacitance can seriously affect the behavior of high-voltage devices, including voltage dividers, insulator strings, modular power supplies, or measuring instruments, among others. Therefore its effects must be ... -
Analysis of demagnetization faults in surface-mounted permanent magnet synchronous motors with symmetric windings
(IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
Conference report
Restricted access - publisher's policyThis paper analyzes a surface-mounted permanent magnet synchronous motor with symmetric winding configuration running under demagnetization fault. The analysis is based on 2D FEM simulations which includes rotor magnet ... -
Analysis of demagnetization faults in surface-mounted permanent magnet synchronous with inter-turns and phase-to-ground short-circuits
(2012)
Conference report
Restricted access - publisher's policyDemagnetization faults are troublesome in permanent magnet synchronous motors since they may greatly reduce their performance and efficiency. Additionally, the temperature of the magnets deeply influences the remanent flux ... -
Analysis of formulas to calculate the AC inductance of different nonmagnetic conductors' configurations
(2016-10-16)
Article
Open Access -
Analysis of formulas to calculate the AC resistance of different conductors' configurations
(2015-10-01)
Article
Open AccessSkin and proximity effects in single- or multi-conductor systems can notoriously affect the AC resistance in conductors intended for electrical power transmission and distribution systems and for electronic devices. This ... -
Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors
(2018-11-02)
Article
Open Access -
Application of the zero-sequence voltage component to detect stator winding inter-turn faults in PMSMs
(2012-08)
Article
Restricted access - publisher's policyThis paper develops and analyzes a methodology for detecting stator winding inter-turn faults in surface-mounted permanent magnet synchronous motors. The proposed methodology is based on monitoring the zero-sequence voltage ... -
Arc fault protections for aeronautic applications: a review identifying the effects, detection methods, current progress, limitations, future challenges, and research needs
(2022-01-11)
Article
Open AccessArc faults are serious discharges, damaging insulation systems and triggering electrical fires. This is a transversal topic, affecting from residential to aeronautic applications. Current commercial aircrafts are being ... -
Arc tracking control in insulation systems for aeronautic applications: challenges, opportunities, and research needs
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-16)
Article
Open AccessNext generation aircrafts will use more electrical power to reduce weight, fuel consumption, system complexity and greenhouse gas emissions. However, new failure modes and challenges arise related to the required voltage ...
