Riassunto analitico
Nowadays, the automotive industry need to comply with stringent regu-lations. In this scenario, electric powertrains are the most promising solutionfor mobility systems due to high efficiency, no production of tail pipe emis-sions and are better in terms of climate change and air quality. However, themost common electric machines for traction application, Permanent MagnetSynchronous Machines (PMSM), are made of Rare Heart materials, char-acterized by volatile costs and uncertainties in long-term availability. Forthis reasons, Externally Excited Synchronous Machines (EESM) become anattractive alternative in e-mobility. They are permanent magnet free, andpresent high power density efficiency and controllability. This thesis proposea study about EESM. The purpose is to have an overview which covers allthe fundamental aspect of electric machine design. Starting from a baselinecase of study, the motor is modelled and simulated at different load condi-tions using JMAG, FEM simulation software for the development of electri-cal devices. Once the model is established, the characterization is performedthanks to a Python script, specifically developed during the thesis. This pro-cess allows to choose between different control strategies such as MaximumTorque per Ampere (MTPA) and Maximum Torque per Watt (MTPW) andits results are used in the motor control. Before proceeding the control, thegeometry of the machine is optimized, and a new design is proposed. Thecharacterization is performed also for this new machine configuration andcompared with the baseline in terms of performance. Finally, the control ofEESMs is performed dealing with not only the stator current but also theadditional degree of freedom that characterizes this motor, the rotor current.
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