Magneto-mechanical coupled vibration analysis study of a direct-drive permanent magnet generator
Tutor / director / evaluatorArcos Villamarín, Robert
Document typeBachelor thesis
Rights accessRestricted access - author's decision
General trend on wind energy industry is to pursue higher and more constant winds to achieve higher figures of energy production. In that line, on the last years most companies in the industry have started operating at offshore locations. However, maintenance has become a delicate issue in those sites since locations are chosen precisely where weather conditions are harsh. One of the more maintenance-demanding elements of an electric machine is the gearbox, and that is why the industry is trying to avoid use of such component with hybrid and direct-drive generators. Nevertheless, cost of energy still favors traditional geared generators of inland machines. This document contains a study on the vibration level on the generator due to resonance, that can lead to a significant weight reduction and, as a consequence, a change on the tendency of the cost of energy parameter in relation to direct driven permanent magnet generators.
One of the main challenges of direct-drive permanent magnet generators design is to securely manage the air gap between the rotor and stator, about 0.5 hof the total rotor diameter. This document contains, on the one hand, a modal analysis of a permanent magnet generator, introducing the use of Super Elements for FE analysis; and on the other hand, a multi-body, multi-physics structural dynamics analysis of arotor-stator assembly subjected to electro-magnetic loads, gravitational effects and wind-induced torque, equivalent to those applied to a fully operational wind turbine generator. Additionally, results obtained numerically with FE analysis are partly correlated with third-party experimental data.
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