Browsing by Author "Riba Ruiz, Jordi-Roger"
Now showing items 1-20 of 107
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A 3D-FEM-based model to predict the electrical constriction resistance of compressed contacts
(2017-09-11)
Article
Restricted access - publisher's policyThis 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 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 ... -
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 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 ... -
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 ... -
Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors
(2018-11-02)
Article
Restricted access - publisher's policy -
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 ... -
Calculation of the ac to dc resistance ratio of conductive nonmagnetic straight conductors by applying FEM simulations
(2015-09-01)
Article
Open AccessThis paper analyzes the skin and proximity effects in different conductive nonmagnetic straight conductors’ configurations subjected to applied alternating currents and voltages. These effects have important consequences, ... -
Calculation of the inductance of conductive nonmagnetic conductors by means of finite element method simulations
(2018-09-13)
Article
Open AccessThis article analyzes the inductance of different conductive nonmagnetic conductors’ configurations under alternating current (AC) supply. The inductance is a key design parameter in tracks of electronic devices, power ... -
Closed-loop controller for eliminating the contact bounce in DC core contactors
(2010-09)
Article
Open AccessThe undesirable phenomenon of the contact bounce causes severe erosion of the contacts and, as a consequence, their electrical life and reliability are greatly reduced. On the other hand, the bounce of the armature can ... -
Combined heat and power design based on environmental and cost criteria
(2016-10-22)
Article
Restricted access - publisher's policyThis paper proposes a hybrid renewable energy system (HRES) consisting of photovoltaic (PV), wind and forest wood biomass power for cogeneration, and applies a multi-objective optimization methodology to study the trade-offs ... -
Comparative study of AC and positive and negative DC visual corona for sphere-plane gaps in atmospheric air
(Multidisciplinary Digital Publishing Institute (MDPI), 2018-10-08)
Article
Open AccessDue to the expansion of high-voltage direct current (HVDC) power systems, manufacturers of high-voltage (HV) hardware for alternating current (ac) applications are focusing their efforts towards the HVDC market. Because ...
