Document Type

Conference Proceeding



Format of Original

7 p.

Publication Date



Institute of Electrical and Electronics Engineers (IEEE)

Source Publication

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

Source ISSN



In this paper, simplified FE-based modeling and analysis of torque ripples in permanent magnet ac machines is presented. The electromagnetic torque is calculated based on the virtual work principle, where field quantities are evaluated using a minimal number of nonlinear magnetostatic finite element solutions. A simple and fast method of incorporating the effects of the stator and/or rotor skew in the torque calculation is introduced. The proposed method requires a minimum number of 2-D finite element evaluations to estimate the electromagnetic torque profile of the skewed machine at a given load condition. This is especially beneficial for rapid evaluation of the effects of stator and/or rotor skew in large-scale design optimization studies. A fast method of evaluating stator tooth forces using a Maxwell stress tensor approach applied to the field quantities calculated using minimum number of 2-D magnetostatic finite element solutions is introduced. Finally, effects of the skew on the developed tooth forces are evaluated.


Accepted version. Published as part of the proceedings of the conference, 2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012: 3055-3061. DOI. © 2012 The Institute of Electrical and Electronics Engineers. Used with permission.

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