Time：15:00-17:00, Tuesday, Nov.5th
Venue：Room 201, Electrical Engineering Building
Speaker：Prof. Robert Kristoffer Nilssen
About the speaker：Professor of the Norwegian Institute of Science and Technology, NTNU.
His research area is Numerical Field Calculations applied in Electrical Power Engineering.
Topic: Numerical field calculations for design of modern electrical machines - practical industrial examples, expectations and future challenges.
Abstract: The presentation includes examples of field calculations used in practical industry projects, in particular focusing on large permanent magnet machines and hydropower generators. The presentation aims to question the need for advanced analysis in the future and challenges in terms of accuracy, computation time for 3D models with nonlinear materials and time stepping and ambitions for optimization of practical designs.
Speaker: Prof. Johan J. C. Gyselinck 
About the speaker：Professor of the Université Libre de Bruxelles (ULB, Belgium).
His research area is low-frequency numerical magnetics, electrical machines and drives, and renewables (wind and photovoltaics).
Topic:Core losses and AC winding losses in finite-element and lumped-parameter analysis of PMSMs - pragmatism versus number crunching
Abstract: Since the early days in the 1980’s, the finite-element (FE) analysis of electrical machines has evolved enormously, both regarding software and hardware, and both in academic and industry. Finding the right balance between accuracy and computational cost for the analysis task at hand is key. Thanks to parameter extraction from the FE model and/or experimental identification, the numerical analysis can be started/continued in a circuit simulator, e.g. Simulink, with consideration of power-electronic supply and the wider system. There is still a big margin for progress in terms of computational cost and accuracy, in particular by devising and cleverly using new modelling techniques. This will be demonstrated in this seminar by focusing on permanent-magnet synchronous machines (PMSMs) and the consideration of core losses, i.e. hysteresis and eddy-current (EC) losses in core and permanent magnets (PMs), and AC winding losses due to skin and proximity effect. This includes homogenization techniques for lamination stacks and multi-turn windings in a FE model, as opposed to their detailed brute-force modelling; implementation/exploitation complexity, computational cost and accuracy will be discussed. An overview of hysteresis models will also be given. A recurrent (sometimes open) question throughout the seminar is: is our modelling approach sufficiently pragmatic or are we only having our computer do overtime.
