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. 2015;2015:812149.
doi: 10.1155/2015/812149. Epub 2015 Mar 23.

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

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Free PMC article

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

Mårten Grabbe et al. ScientificWorldJournal. .
Free PMC article

Abstract

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.

Figures

Figure 1
Figure 1
The geometry used in the FE model of the reference machine.
Figure 2
Figure 2
A stator slot opening and the two cables closest to the air gap showing the geometry parameters used in this study.
Figure 3
Figure 3
The hysteresis loss in the stator teeth and the load angle as a function of the waist factor.
Figure 4
Figure 4
The efficiency and the load angle as a function of the distance between cables.
Figure 5
Figure 5
The change in weight and the load angle as a function of the distance from the winding to the air gap.
Figure 6
Figure 6
Efficiency and B-field in tooth at nominal load for varying distance between cable and stator.
Figure 7
Figure 7
Illustration of the magnetic field distribution in the reference machine (to the left) and the new design (to the right).

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