E. Schmidt, M. Kaltenbacher, A. Wolfschluckner:
"About Accuracy and Influence of the Pole Coverage for Eddy Current Losses within Permanent Magnets of Electrical Machines";
Talk: INTERMAG, Singapore; 04-23-2018 - 04-27-2018.

Abstract - In particular with surface mounted permanent magnets, eddy current losses within the magnets are one of
the most significant portion of losses in permanent magnet exited synchronous machines. These losses are generated
by asynchronous components of the air-gap field caused by either higher harmonic waves or higher time harmonics.
On one hand, there is no interaction of the various harmonics with regard to these losses. On the other hand, the
pole coverage shows a significant impact on these losses. Thus, detailed numerical analyses with various higher order
formulations are carried out in order to show aspects of the accuracy of these eddy current losses, too.

https://publik.tuwien.ac.at/files/publik_272550.pdf