Design of Direct Driven Alternators for Renewable Energy Applications

Permanent magnet generators for renewable energy application have been subject of research during last two decades. Several kinds of rotating electrical generators exist for several applications, including synchronous, induction and DC machines. Doubly Fed Induction Generator is proposed as an alternative solution with respect to the cost of such a system. However, a bigger emphasis in the report has been put on the design of direct driven Permanent Magnet Synchronous Generator (PMSG) to get obtain higher energy conversion efficiency at lower speeds by avoiding gear boxes and this type of PMSGs are compatible for Wind and water Turbines. Further different topologies of direct driven PMSGs with a focus on configurations, different windings and thermal behavior is presented and prototype of a direct driven PMSG is designed and the designs verified by means of Finite Element Analysis (FEA) and thermal modeling size of Direct driven PMSG to obtain optimisation methodology for an. Further describes an analytical optimization of a longitudinal, inner rotor, radial flux, surface mounted PMSG with distributed winding and natural air cooling system. An FEA model of the optimized machine is developed and the results are illustrated.