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A methodology to remove stator skew in small-medium size synchronous generators via innovative damper cage designs

Nuzzo, Stefano; Bolognesi, Paolo; Vakil, Gaurang; Fallows, Daniel; Gerada, Chris; Brown, Neil L.; Galea, Michael


Stefano Nuzzo

Paolo Bolognesi

Neil L. Brown

Professor of Electrical Machines and Drives


This paper proposes and investigates an innovative methodology that can have a significant impact on the market potential of wound field, small-medium size synchronous generators. The technique proposed here is aimed at removing the need for the traditional stator skewing that is so commonly used in synchronous generators to achieve acceptable values of voltage total harmonic distortion. To do this, a non-standard damper cage configuration is proposed that comprises modulation of the damper bars’ positioning. An off-the-shelf, 400kVA generator is used as a benchmark machine. Its rotor is optimized and modified according to the proposed technique. The results of the final machine are then compared to the benchmark machine highlighting the excellent advantages that can be achieved through this technique. A full-scale prototype of the modified generator is then built to experimentally validate the concept. Finally, a detailed analysis on all the performance aspects of the prototype is done, to guarantee that the proposed technique has no negative impact whatsoever on the generator’s performance.


Nuzzo, S., Bolognesi, P., Vakil, G., Fallows, D., Gerada, C., Brown, N. L., & Galea, M. (2019). A methodology to remove stator skew in small-medium size synchronous generators via innovative damper cage designs. IEEE Transactions on Industrial Electronics, 66(6), 4926-4307.

Journal Article Type Article
Acceptance Date Jul 27, 2018
Online Publication Date Aug 15, 2018
Publication Date Jun 1, 2019
Deposit Date Oct 1, 2018
Publicly Available Date Oct 2, 2018
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 66
Issue 6
Pages 4926-4307
Keywords Control and Systems Engineering; Electrical and Electronic Engineering
Public URL
Publisher URL


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