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master thesis work ELTEKNIK@CHALMERS PMSM with field strengthening ability for electric vehicle propulsion Goal: To design and characterize a permanent magnet electrical machine (PMSM) where the direct inductance is higher than the quadrature and to determine the performance. Relate this performance to an existing classical PMSM. Background: The majority of electrical vehicles are today driven by PMSMs. A problem is that the way they are designed, then have a very good performance at low speed and high torque, but a very negative consequence is that the losses become very high at high rotational speeds. Since vehicles very seldom operate at the high torque values, a change in the loss map could mean efficiency improvements. An idea is to instead design the machine so that the high-speed losses become lower through using weaker magnets, and instead make it easier to magnetise the machine with the stator winding, a so called field strengthening machine. Arc Plan: Check the performance of an existing PMSM using the FEM program ANSYS MAxwell. Redesign the rotor so that the direct inductance become higher than the quadrature inductance. Determine the performance of the machine and its efficiency at various operating points. Quantify the impact in some drive cycles, for instance the NEDC, Number of Students: 1-2 Start time: August 2016 Contact persons: Torbjörn Thiringer, [email protected]