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A Seminumerical Finite-Element Postprocessing Torque Ripple Analysis Technique for Synchronous Electric Machines Utilizing the Air-Gap Maxwell Stress Tensor

Spargo, C.M.; Mecrow, B.C.; Widmer, J.D.

A Seminumerical Finite-Element Postprocessing Torque Ripple Analysis Technique for Synchronous Electric Machines Utilizing the Air-Gap Maxwell Stress Tensor Thumbnail


Authors

C.M. Spargo

B.C. Mecrow

J.D. Widmer



Contributors

Abstract

A novel method to calculate the harmonic torque components in synchronous machines is presented. Harmonic torque components create a torque ripple, which is undesirable in many applications. This torque ripple is a major cause of acoustic noise and vibration and can limit the machine's application range. A seminumerical method is developed to calculate and analyze harmonic torque components based on Maxwell stress tensor theory. Development of the Maxwell stress expressions leads to a simple algebraic expression for the calculation. Finite-element (FE) analysis is used to determine the equation variables. It is shown that postprocessing of the FE solution provides valuable information regarding the composition of the torque waveform, based upon field harmonics, which was previously unavailable. A deeper insight can be gained into more direct electromagnetic design changes to reduce torque ripple in synchronous machines, improving their torque quality. As an example, the developed method is applied to a synchronous reluctance machine with fractional slot concentrated windings that is known to exhibit high torque ripple.

Citation

Spargo, C., Mecrow, B., & Widmer, J. (2014). A Seminumerical Finite-Element Postprocessing Torque Ripple Analysis Technique for Synchronous Electric Machines Utilizing the Air-Gap Maxwell Stress Tensor. IEEE Transactions on Magnetics, 50(5), Article 7026909. https://doi.org/10.1109/tmag.2013.2295547

Journal Article Type Article
Acceptance Date Dec 10, 2013
Online Publication Date Dec 20, 2013
Publication Date May 1, 2014
Deposit Date Jan 21, 2016
Publicly Available Date Mar 28, 2024
Journal IEEE Transactions on Magnetics
Print ISSN 0018-9464
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 50
Issue 5
Article Number 7026909
DOI https://doi.org/10.1109/tmag.2013.2295547

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Accepted Journal Article (896 Kb)
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Copyright Statement
© 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.





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