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Design Optimisation and Comparison of Fractional-Slot Overlap and Non-Overlap Winding Direct-Drive PM Wind Generators for DC-connected Applications

The aim of this paper is to investigate and compare the use of direct drive fractional-slot overlap and non-overlap winding permanent magnet synchronous wind generators and to highlight the different design considerations and trade-offs to industry. The generators are designed for small-scale DC-grid or battery connected wind energy systems. Both fractional-slot overlap and non-overlap winding generators are optimised to be cost effective and to have minimal cogging torque. It is found that the non-overlap winding permanent magnet synchronous generator has an overall better performance for dc-connected wind energy systems in terms of the generator active mass and permanent magnet mass.