Tapia Ladino, Juan AntonioMadariaga Cifuentes, Carlos Felipe Ignacio2024-11-052024-11-052024https://repositorio.udec.cl/handle/11594/6555Tesis presentada para optar al grado académico de Doctor en Ciencias de la Ingeniería Mención Ingeniería EléctricaLow-speed high-torque electrical machines have been dominated by permanent magnet synchronous machines, given their high torque density, efficiency and power factor. Nevertheless, in direct-drive low-speed applications, a solution consisting of a conventional induction machine and a mechanical converter is used considering the self-starting capability of the IM and acceptable efficiency of the system. The solution for direct-drive LSHT applications is to adopt machines with inherently low speed, self-starting capacity, and high performance, which has not been possible to date from conventional induction machines and synchronous reluctance machines. In this regard, this thesis addressed the sizing, analysis, and optimization of axial flux induction motors with a novel matrix structure rotor to meet the requirements of LSHT applications. Furthermore, in order to identify the competitivity of these machines and their application niche, opening a path to further research on this promising topology, considering both deterministic and robust design features. Firstly, an analytical pre-sizing methodology focusing on the main and particular design parameters of an AF-MRIM is provided, considering guidelines for a suitable selection of the matrix rotor structure. A semi-analytical tool based on finite element simulations was specifically devised to quickly assess the performance of AF-MRIM, simplifying the matrix rotor structure, and enabling the time-efficiency design and multi-objective optimization of an AF-MRIM, unfeasible to perform with conventional techniques so far. Secondly, several finite-element tools and solutions to assess the effect of unavoidable, manufacturing and assembly tolerances on the performance of asynchronous and synchronous machines are presented, meant to serve as input for a detailed comparative analysis between different machine designs from deterministic and robust design approaches. Finally, a detailed comparison of optimized AF-MRIM with other non-conventional and conventional topologies is provided, considering raw performance and robust design capability. Two objective speeds (250 and 500 rpm) are evaluated by means of specific design optimization and robustness assessment of the different topologies. It was demonstrated that an optimized AF-MRIM has superior performance among rare-earth free topologies but does not reach the performance and torque density of an optimized PMSM. Nonetheless, the MRIM has the highest robustness ratings of all the four selected topologies. At last, it was found that the proposed matrix-rotor IM is actually suitable for LSHT applications, with significant superiority at 250 rpm, direct-drive operation; and slight advantages at 500 rpm when compared to prominent rare-earth free topologies.enCC BY-NC-ND 4.0 DEED Attribution-NonCommercial-NoDerivs 4.0 InternationalMotores (Mecánica)Sistemas de propulsiónInducción electromagnéticaThesis