Vibrations from Magnetic Forces in Hydropower Generators
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- Institutt for elkraftteknikk 
Electrical machines using a fractional slot winding can be subject to low modes of vibration, which can produce noise and stator deformation. The design of a machine has an influence on the amplitude of these deformations, and it would be interesting to know how the design affects this amplitude. For this work, two different models of hydro-power generators have been developed on a Finite Element Analysis software. The results of the simulations for the machines under different loads have been exploited later on using a numerical computing environment and compared to withdraw conclusions about the effect of the design of a machine on low modes of vibration. The results showed that the slot width and the type of load have an influence on the amplitude of both lowest mode of vibration and zeroth mode. Now the effect of the slot width is certain, further work would be to investigate more on one of the machines to have a more precise idea of how evolves the amplitude of the zeroth and lowest mode for different slot widths.