Title: Eddy current losses in permanent magnets of surface mounted permanent magnet synchronous machines : Analytical calculation and high order finite element analyses
Language: English
Authors: Schmidt, Erich 
Kaltenbacher, Manfred 
Wolfschluckner, Anton 
Category: Original Research Article
Keywords: eddy currents; eddy current losses; permanent magnet machine; finite element analysis
Issue Date: 2017
Journal: Elektrotechnik und Informationstechnik : e & i 
Permanent magnet exited synchronous machines always show three significant portions of their losses: Iron losses within the magnetic circuit, power losses within the stator winding and finally eddy current losses within the permanent magnets. In particular, surface mounted magnets are directly exposed to asynchronous components of the air-gap field caused by either higher harmonic waves or higher time harmonics. Analytical calculation of the eddy current losses within the permanent magnets for both linear as well as cylindrical arrangements describe fundamental characteristics in dependence on only few significant parameters. These results serve as reference results for detailed numerical calculations using the finite element method, too. The finite element analyses with various formulations of the shape functions show the significant influence of the higher order elements on the accuracy of the eddy current losses. Additionally, the effects of a various pole coverage can be obtained from the results of the numerical calculations. Therefore, a clear summary of the significant parameters influencing the eddy current losses within the permanent magnets for both linear as well as cylindrical arrangements will be established.
DOI: 10.1007/s00502-017-0498-y
Library ID: AC15187486
URN: urn:nbn:at:at-ubtuw:3-4133
Organisation: E370 - Institut für Energiesysteme und Elektrische Antriebe 
Publication Type: Article
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