Máster sistemas ferroviarios y tracción eléctrica

Peer Reviewe

A device for improving the immunity of AC contactor during voltage dips

This paper describes an electronic device that enables AC contactors to ride through power quality dsturbances. The proposed device is connected to the contactor coil and consists of a power conversion excitation and hold-in crcuit, a control circuit, an immunity circuit and a shutdown circuit. It does not disturb contactor operation, is easy to use nd can be built from cheap, commercially available components. Experimental tests have demonstrated the efectiveness of the proposed electronic device for improving the immunity of AC contactors during power quality disturbances, particularly voltage dips.Postprint (published version

Technical and professional communication in the European Project Semester (EPS)

In the European Project Semester (EPS), communication is key. It is through continuous communication that project teams can plan and develop their projects, involving supervisors and companies in internationalized contexts. Furthermore, project outcomes are defined in the form of communication artifacts, typically a written report and an oral presentation, both of which are assessed in terms of their contents and communicative value. Set in the context of the EPS programme at UPC, this chapter situates TPC in engineering education and identifies communication practices as part of the professional practices of engineers. After presenting the main approaches to TPC in engineering, the chapter discusses how TPC is approached from a problem-solving perspective. The rationale and organization of the TPC course are presented, together with examples of tasks based on a practical methodology that promotes familiarization, practice, reflection and dialogue. From the principles discussed, a specific proposal is made for integrating TPC in EPS and similar capstone programmes. From an interdisciplinary perspective, this chapter reflects on the importance of TPC in engineering education, the requirements of globalized professional settings and the pervasiveness of digitalization, to discuss how engineering students can effectively engage in international engineering communication.Objectius de Desenvolupament Sostenible::4 - Educació de QualitatObjectius de Desenvolupament Sostenible::4 - Educació de Qualitat::4.3 - Per a 2030, assegurar l’accés en condicions d’igualtat per a tots els homes i dones a una formació tècnica, professional i superior de qualitat, inclòs l’ensenyament universitariObjectius de Desenvolupament Sostenible::9 - Indústria, Innovació i InfraestructuraObjectius de Desenvolupament Sostenible::9 - Indústria, Innovació i Infraestructura::9.1 - Desenvolupar infraestructures fiables, sostenibles, resilients i de qualitat, incloent infraestructures regionals i transfrontereres, per tal de donar suport al desenvolupament econòmic i al benestar humà, amb especial atenció a l’accés assequible i equitatiu per a totes les personesPostprint (author's final draft

Evolució dels plans d'estudi d'electricitat a l'Escola Universitària Politècnica de Vilanova i la Geltrú

Molt a prop de la celebració del centenari de l’Escola Universitària Politècnica de Vilanova i la Geltrú, originalment Escuela Superior de Industrias de Villanueva y Geltrú, els autors volen fer en aquesta comunicació una anàlisi crítica dels Plans d’Estudis d’Enginyeria Tècnica en Electricitat que hi ha hagut al llarg dels darrers cent anys. Considerant tant l’evolució dels seus objectius i aspectes organitzatius com la dels seus continguts

In-wheel axial-flux SRM drive for light electric vehicles

Revenues from global sales of light electric vehicles are expected to grow from $9.3 billion in 2017 to$ 23.9 billion in 2025. In order to boost this growth electric drives with better features and lower costs have to be developed. This paper presents a new in-wheel axial-flux switched reluctance motor with double rotor and a particular disposition of the stator and rotor poles that provides short flux path without flux reversal. The magnetic active parts of the stator and the rotor are built using soft magnetic composites. The motor is fed from batteries trough a on purpose designed electronic power controller. Simulation of the whole drive, using Matlab-Simulink coupled with the results of the three dimensional finite analysis of the motor is carried out. Simulation results prove that the proposed in-wheel axial-flux switched reluctance motor drive is adequate for the propulsion of electric light vehicles

Switched reluctance drives for electric vehicle applications

Electric vehicles are the only alternative for a clean, efficient and environmentally friendly urban transport system. With the increasing interest in electric drives for electric vehicle propulsion. This paper first tries to explain why the switched reluctance drive is a strong candidate for electric vehicle applications. It then gives switched reluctance drive design guidelines for battery or fuel cell operated electric vehicles. Finally, it presents the design and simulation of a switched reluctance motor power train.Preprin

Influence of the regime of electropulsing-assisted machining on the plastic deformation of the layer being cut

In this article, the influence of electropulsing on the machinability of steel S235 and aluminium 6060 has been studied during conventional and electropulsing-assisted turning processes. The machinability indices such as chip compression ratio ¿, shear plane angle f and specific cutting energy (SCE) are investigated by using different cutting parameters such as cutting speed, cutting feed and depth of cut during electrically-assisted turning process. The results and analysis of this work indicated that the electrically-assisted turning process improves the machinability of steel S235, whereas the machinability of aluminium 6060 gets worse. Finally, due to electropluses (EPs), the chip compression ratio ¿ increases with the increase in cutting speed during turning of aluminium 6060 and the SCE decreases during turning of steel S235.Peer ReviewedPostprint (published version

Power losses in outside-spin brushess DC motor

Outside-spin brushless D.C. motors are an alternative to conventional D.C. brush permanent magnet motors, especially in applications that require low power and costs and in which high inertia effects are advantageous. This paper presents a procedure for computing power losses in these kinds of machines. Expressions are derived for predicting copper losses, power interrupter losses, stator iron losses in the tooth and in the yoke, mechanical losses, friction and windage. Stray load losses are also considered and evaluated from previous measurements in outside-spin brushless D.C. motors. The results obtained from the approach proposed are compared to those measured on existing motors, showing a good agreement.Preprin

Electric drives for light e-scooters

In the next years is expected an important rise in sales of electrical scooters in the entire world but especially in China. In order to address this challenge the electric scooter industry has to be more competitive in the transportation market and therefore important improvements, in terms of energy density and costs, have to be done in the electric storage system and in the electric propulsion system. In this paper, an analytical and experimental comparison of two different drives for electric scooters is carried out. Both are permanent magnet synchronous outer rotor motor drives but one placed inside the rear wheel and the other connected to the wheel trough a mechanical transmission.Postprint (published version

Design of a novel modular axial-flux double rotor switched reluctance drive

Nowadays, there is a renewed interest in switched reluctance machines and especially in axial-flux switched reluctance machines (AFSRM). This paper presents a comprehensive design procedure for modular AFSRM with an inner stator and two exterior rotors that have a new distribution of the stator and rotor poles, resulting in short magnetic paths with no flux reversal. After a description of the proposed machine, the output torque equation is derived from a simplified non-linear energy conversion loop and guidelines for its design are given. Once the preliminary sizing has been carried out the different modules of the AFSRM, the magnetically active parts made with SMC, are reshaped or refined using 3D printing and 3D electromagnetic finite element analysis until they reach their definitive shape and dimensions. Finally, an AFSRM has been built following the proposed design procedure and has been validated by experimental measurementsPeer ReviewedPostprint (published version