Mat-1.3656 Seminar on
numerical analysis and computational science
Monday, Oct 3, 2011, room
U322 at 14.15, Eirola & Stenberg
Paavo Rasilo, A"
Modeling of iron losses in electrical machines by FEM
Electrical machines are
commonly analyzed with the 2-D finite element method (FEM) by solving
Ampere's law in the cross-sectional domain in terms of the magnetic
vector potential. In the iron core of the machine, ferromagnetic
hysteresis causes the material properties to be history-dependent which
makes it difficult to find the solution using the Newton-Raphson
method. In addition, the eddy currents induced into the core are
typically 3-D in nature and thus difficult to be modeled in the 2-D
domain. Due to these difficulties, the hysteresis and eddy-current
effects have usually been omitted from the FE solution. In this
presentation, some methods of modelling these phenomena within the 2-D
FEM are described.