Didáctica de la electrotecnia: un estado del arte

La didáctica, del griego didaktikós, es el “arte de enseñar”, mientras que la electrotecnia sería el “estudio de las aplicaciones técnicas de la electricidad”. En este trabajo fin de máster se desarrolla un estado del arte sobre didáctica de la electrotecnia, con el objetivo de que pueda servir como orientación en el ejercicio de la profesión docente. En primer lugar, se contextualiza brevemente la situación de la electrotecnia en los sistemas escolar y universitario españoles, para después desarrollar una revisión bibliográfica sobre didáctica de la electrotecnia. En ella se incluyen todas las etapas formativas, desde la educación infantil hasta la universidad. Tras explicar las publicaciones analizadas y algunos proyectos de innovación en formación profesional, se plantea una reflexión crítica sobre la revisión realizada. Al detectarse que con anterioridad se han analizado ciertas dificultades de aprendizaje propias del campo de la electrotecnia, se procede a elaborar un cuestionario para investigar algunas concepciones sobre electrotecnia en varios grupos de población, establecidos según la formación académica. Finalmente, se analizan los resultados del cuestionario y se obtienen conclusiones. Queda de manifiesto que, en algunos casos, no se comprenden con suficiente seguridad aspectos muy básicos y esenciales de la electrotecnia.<br /

A Review of Transverse Flux Machines Topologies and Design

High torque and power density are unique merits of transverse flux machines (TFMs). TFMs are particularly suitable for use in direct-drive systems, that is, those power systems with no gearbox between the electric machine and the prime mover or load. Variable speed wind turbines and in-wheel traction seem to be great-potential applications for TFMs. Nevertheless, the cogging torque, efficiency, power factor and manufacturing of TFMs should still be improved. In this paper, a comprehensive review of TFMs topologies and design is made, dealing with TFM applications, topologies, operation, design and modeling

Analytical Optimal Design of a Two-Phase Axial-Gap Transverse Flux Motor

Transverse flux motors (TFMs) are being investigated to be used in vehicle traction applications due to their high torque density. In this paper, a two-phase axial-gap transverse flux motor is designed for an electric scooter, proposing a novel analytical design method. First, the dimensioning equations of the motor are obtained based on the vehicle requirements, and the stationary dq model is calculated. Then, the motor is optimized using a multiobjective genetic algorithm, and finally a 3D-FEM verification is made. Both the motor structure and the design method aim to have a low complexity, in order to favor the sizing and manufacturing processes through a low computation time and simple core shapes. This approach has not yet been explored in axial-gap TFMs

A Comprehensive Analytical Sizing Methodology for Transverse and Radial Flux Machines

Transverse flux machines have the potential to offer high torque density in direct-drive vehicle traction applications. Besides, sizing equations are a wide-spread technique for transverse flux machines design, as their computational cost is much lower than the finite element method. In this paper a novel analytical sizing methodology for transverse and radial flux machines is presented, focusing on the current load and the pole length factor as the main design parameters. The motor specifications are intended for a light-duty electric vehicle application. As transverse flux machines have a single, hoop-shaped coil per phase that embraces the flux of all the pole pairs, their principle of operation and therefore their sizing equations differ from radial flux machines. The proposed analytical method allows to compare transverse and radial flux machines easily through a similarity analysis and a parametric study. Furthermore, the discrepancies between the analytical model and the finite element method are quantified and then included in previous equations. Then the analytical model is optimized with a multiobjective genetic algorithm in the final stage. According to the sizing methodology presented here, transverse flux machines have a superior performance than radial flux machines in terms of torque density and efficiency

Modelado y control de un motor de imanes permanentes aplicado a un vehículo de movilidad personal.

El presente documento tiene por objeto el desarrollo de diferentes algoritmos de control aplicados al sistema de tracción de un vehículo de movilidad personal. Con el fin de justificar la aportación de este trabajo fin de máster, se realizó una investigación acerca de los avances que se han llevado a cabo en el control de vehículos eléctricos, tanto con técnicas de control difuso como con técnicas de control basadas en redes neuronales. Debido a la dificultad de encontrar una hoja de datos en la que se especificaran todos los parámetros del motor, se realiza un diseño preliminar partiendo de las especificaciones generales del patín analizado. El modelo del sistema de tracción del patín se desarrolla usando la herramienta Matlab-Simulink y los controles que se van a analizar y comparar son los siguientes: control PI (usado como técnica de control de referencia), control fuzzy y control neural. Para los tres controles desarrollados se lleva a cabo un análisis y una comparación de la respuesta dinámica obtenida, en la que se comparan tres datos objetivos como son el tiempo de respuesta, la sobreoscilación y el error de velocidad. <br /

Energy efficiency engagement training in SMEs: A case study in the automotive sector

Energy efficiency requirements in Europe are set by the Energy Efficiency Directive, considering energy audits as a systematic procedure to determine the savings in energy costs. These kinds of tools provide useful information for companies to identify opportunities for the improvement of their energy performance. However, the regulation is only applied for non-SMEs in Europe, which make up only 0.2% of the total number of European companies. Compared in terms of the value added or the number of employees, these companies are still at a lower percentage than small and medium enterprises. The wide versatility of small companies, however, makes it difficult to de-termine a regulation that promotes the objective of the Directive in a uniform way. For this reason, one aspect that is being worked on with small companies is raising awareness and training in energy aspects, encouraging them to carry out activities to improve their energy performance based on their own initiative. In this regard, within the framework of an H2020 research project based on the automotive sector, the E2DRIVER project, a collaborative–cooperative training methodology has been designed to motivate and empower the key actors within a company. This paper describes the methodology and its implementation in different companies in European countries, providing some representative results

Novel utility-scale photovoltaic plant electroluminescence maintenance technique by means of bidirectional power inverter controller

Producción CientíficaNowadays, photovoltaic (PV) silicon plants dominate the growth in renewable energies generation. Utility-scale photovoltaic plants (USPVPs) have increased exponentially in size and power in the last decade and, therefore, it is crucial to develop optimum maintenance techniques. One of the most promising maintenance techniques is the study of electroluminescence (EL) images as a complement of infrared thermography (IRT) analysis. However, its high cost has prevented its use regularly up to date. This paper proposes a maintenance methodology to perform on-site EL inspections as efficiently as possible. First, current USPVP characteristics and the requirements to apply EL on them are studied. Next, an increase over the automation level by means of adding automatic elements in the current PV plant design is studied. The new elements and their configuration are explained, and a control strategy for applying this technique on large photovoltaic plants is developed. With the aim of getting on-site EL images on a real plant, a PV inverter has been developed to validate the proposed methodology on a small-scale solar plant. Both the electrical parameters measured during the tests and the images taken have been analysed. Finally, the implementation cost of the solution has been calculated and optimised. The results conclude the technical viability to perform on-site EL inspections on PV plants without the need to measure and analyse the panel defects out of the PV installation.Ministerio de Industria, Economía y Competitividad (grant number RTC-2017-6712-3)Junta de Castilla y León (grant VA283P18

Analytical Optimal Design of a Two-Phase Axial-Gap Transverse Flux Motor

Transverse flux motors (TFMs) are being investigated to be used in vehicle traction applications due to their high torque density. In this paper, a two-phase axial-gap transverse flux motor is designed for an electric scooter, proposing a novel analytical design method. First, the dimensioning equations of the motor are obtained based on the vehicle requirements, and the stationary dq model is calculated. Then, the motor is optimized using a multiobjective genetic algorithm, and finally a 3D-FEM verification is made. Both the motor structure and the design method aim to have a low complexity, in order to favor the sizing and manufacturing processes through a low computation time and simple core shapes. This approach has not yet been explored in axial-gap TFMs

Participatory Process Protocol to Reinforce Energy Planning on Islands: A Knowledge Transfer in Spain

European Union (EU) islands face vast challenges to cope with climate targets while handling complex stakeholders’ networks. This study aims to propose a Participatory Process Protocol to enhance the output of energy plans and projects through the effective engagement of local stakeholders. A knowledge transfer methodology is set to build on a successful experience of the Mediterranean port-cities of Málaga, Cádiz and Sète, now adapted into the case of European Union’s islands advancing with energy developments. First, a clustering analysis is carried out for inhabited islands, resulting in 4 clusters that serve as the classification for the calculation of energy transition Key Performance Indicators according to information received from 70 islands. Based on this, the original Protocol is restructured as a complement for the Sustainable Energy and Climate Action Plan methodology, the one most adopted by European islands. Finally, how the Protocol might be implemented depending on the particularities of each cluster is discussed, as well as for the case of Spanish islands (Gran Canaria, Tenerife, and La Palma). Specific suggestions and key recommendations for the implementation of the Participatory Process Protocol are mentioned, as an instrument that could raise strategic suggestions from stakeholders to enhance the results of decision-making processes