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Mechanical design of Mega Watt offshore wind generators
Offshore wind generators with a high installed capacity of several hundred megawatts have been more in focus recently due to number of reasons (favorable wind sites, environmental considerations, …). However, offshore wind farms are more expensive than wind farms built onshore. In that respect, maintenance and reliability are of great importance as faults can be much harder to tackle than for onshore wind farms. A standard design of conventional wind generator comprises a gearbox and an induction generator. Another solution is to use a direct-driven synchronous generator with permanent magnets and an inverter. In that case, the maintenance costs decrease since the gearbox is removed. Another advantage is that variable speed becomes possible and therefore the efficiency increases. However, the total weight of the system increases, as the direct-driven generator is normally larger in size. Therefore, radial-flux permanent magnet synchronous generators have been adopted as solution. The purpose of the ongoing research project is to investigate another solution, using transversal flux machine.
A novel transversal flux generator has been developed at KTH. This topology has been investigated in order to develop a cost-effective direct-driven generator in the MW class for future offshore wind farms. The torque per unit mass and cost per torque can be optimised but the model right now takes only into account the electromagnetically active weight (copper, iron and permanent magnets). This weight is only a part of the machine (about 30 to 40%), as substansial material is required to hold this “active” material in space and maintain small airgaps between rotor and stator.
The purpose of the project is to perform the mechanical design of the wind generator. The first part of the project will consist in an analysis of the efforts on the different parts of the generator. In the second part, the mechanical structure that holds the electromagnetically active parts will be defined. Finite elements will be used to calculate the main dimensions of the structure and the deformations near the aig gaps.
This work will be conducted at the department of Mechanics, KTH, under the supervision of Dr Jean-Marc Battini (KTH Mechanics) and Dr Juliette Soulard (Electrical Machines and Power Electronics, KTH). ABB and Vindforsk are sponsors of the PhD project investigating this new topology for wind generators.
For more information, please contact
Jean-Marc Battini 08-7908035
Juliette Soulard 08-7907736
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