Atuador eletromagnético para motores de combustão interna sem árvore de cames (camless engine)

• Autor(a) principal: Miguel Castro Pinto
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/10216/137397
• topic: Engenharia electrotécnica, electrónica e informática; Electrical engineering, Electronic engineering, Information engineering

The main objective of this thesis is to develop an electromagnetic actuator that has the capabilities of replacing the camshaft of an internal combustion engine (one actuator per valve). In order for this to happen, certain requirements need to be met. Regarding volume, acceleration, dynamic movement and course. Since this is a fairly ambitious goal for the time available, the work will focus only on the development of a virtual prototype. The simulator used was ANSYS Electronics Desktop - Maxwell 3D. Since the author had no experience with the application and this one is fairly complex, a big portion of the time dedicated to this project was invested in learning the functionalities of the application. After numerous research it was established that the first prototype would be a Lorentz force actuator with a dual-Halbach array topology. The methodology used to create the consequent prototypes (total of five) was iterative, changing one or more parameters in each iteration. From the analysis of the results, conclusions can be drawn for what characteristics are advantageous in reaching the system requirements. The following conclusions were also drawn: dual-Halbach array is a plus if high acelaration is not required but force and low power dissipation is; the material holding the magnets in place should be of high magnetic permeabilbity. The results also showed that a Lorentz force actuator, in which the windings are static, meaning that the permanent magnets are part of the moving part requires too much power for the application we desire. A prototype was reached that is capable of working on a motor with a maximum rotational speed of 3716 rpm.