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Elisabet Jansson är industridoktorand i forskargruppen Elmaskiner och kraftelektronik
Examinator är professor Torbjörn Thiringer vid forskargruppen Elmaskiner och kraftelektronik
The interest in electric vehicle propulsion is rising rapidly, with the Permanent Magnet Synchronous Machine (PMSM) as the most commonly used machine type in Battery Electric Vehicles (BEVs). While electric machines have a long history, the operating conditions related to vehicle propulsion bring new challenges and design innovations. One challenge is to reach a high efficiency over the wide range of operating points occurring in real world driving. Simultaneously, the machine should not be overly bulky or costly, but still have the performance needed for strong vehicle accelerations.
This project deals with design and analysis of PMSMs in BEV applications. The overall aim of the project is to include real world driving data throughout the machine design process, and thereby arrive at a machine that is custom made for a given type of driving. So far, the project has focused on modelling of PMSMs, using finite element method (FEM), and analysis of PMSMs in relation to drive cycles. The importance of mesh density and time resolution in the FEM software is investigated. The influence of saturation effects on the field weakening performance of a PMSM is analysed. Scaling of FEM results is used to match PMSM performance against drive cycle requirements. Finally, scaling is used together with variation in current to identify the trade-off between inverter current rating and PMSM volume, for a given PMSM geometry and set of drive cycles.