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The Scientific World Journal
Volume 2015 (2015), Article ID 812149, 6 pages
Research Article

On the Stator Slot Geometry of a Cable Wound Generator for Hydrokinetic Energy Conversion

The Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, The Ångström Laboratory, Uppsala University, P.O. Box 534, 751 21 Uppsala, Sweden

Received 17 June 2014; Accepted 5 October 2014

Academic Editor: Linni Jian

Copyright © 2015 Mårten Grabbe et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The stator slot geometry of a cable wound permanent magnet synchronous generator for hydrokinetic energy conversion is evaluated. Practical experience from winding two cable wound generators is used to propose optimized dimensions of different parts in the stator slot geometry. A thorough investigation is performed through simulations of how small geometrical changes alter the generator performance. The finite element method (FEM) is used to model the generator and the simulations show that small changes in the geometry can have large effect on the performance of the generator. Furthermore, it is concluded that the load angle is especially sensitive to small geometrical changes. A new generator design is proposed which shows improved efficiency, reduced weight, and a possibility to decrease the expensive permanent magnet material by almost one-fifth.