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.
Highlights
The permanent magnet geometry and stator slot geometry are important design parameters in the magnetic circuit of an electrical machine
The finite element analysis of the cable wound generator shows that the performance can be improved by apparently small changes in the stator slot geometry
A new design is proposed based on practical experience from winding two prototypes, and simulations predict an increase in efficiency of 0.6 percentage points, while the stator core weight is
Summary
The permanent magnet geometry and stator slot geometry are important design parameters in the magnetic circuit of an electrical machine. The importance of changes on the millimetre scale in the stator slot geometry is discussed based on the practical experience from the design and the assembly of two prototypes. In order to incorporate practical experience from construction of two prototypes, the influence of one parameter at a time is discussed rather than a traditional optimization study. Such improvements would likely be relevant even if other parameters in the design would be changed
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