Comparing different materials for rotor-can in flooded generators

Conference paper (2018)

Authors

F.M. Wani Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering
J. Dong DC systems, Energy conversion & Storage - EEMCS
Avinash Yadav Bakker Sliedrecht Electro Industrie B.V.
H. Polinder Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering
Research Group
Transport Engineering and Logistics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2018 F.M. Wani, J. Dong, Avinash Yadav, H. Polinder
DOI: https://doi.org/10.1109/ICELMACH.2018.8506730
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Published Date

2018

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Transport Engineering and Logistics

Abstract

Flooded Generators have been proposed as a possible solution to eliminate the risks due to the seal failure, and improve cooling in tidal stream turbine generators. In a flooded generator, the stator-rotor gap is filled with the seawater; this poses a serious corrosion risk to the material inside the generator. For this reason, a can or a protective shield is used on the stator and the rotor surfaces in the watergap. This paper compares different rotor-can materials based on the eddy current losses in the rotor-can, and its impact on the temperature inside the generator. Due to the flooded gap, the temperature rise in magnets, because of rotor-can eddy current losses is much lower than in a corresponding airgap machine. Thus from the thermal point of view, the choice of the rotor-can material is less critical in a flooded generator than in an airgap generator.

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