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Title: Structural analysis of low speed, high torque electrical generators for direct drive renewable energy converters
Author: McDonald, Alasdair Stewart
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2008
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Direct drive renewable energy converters provide a low speed, high torque input to the electrical generator. As a result these generators must be larger than their high speed counterparts. Because of this size and the large airgap-closing force, the structural design must be stiff and robust. This typically results in heavy generators, with structural (‘inactive’) material dominating the electromagnetically ‘active’ material. Design tools are set out, validated and used to model the inactive material in high torque axial-flux and radial-flux type machines. Simple optimisations on generator aspect ratios are carried out to find lighter designs. Axial-flux and radial-flux permanent magnet synchronous machines for wind turbines are compared in terms of mass and a cost criterion, with and without the inactive mass. Some machines are designed in such a way that the normal force is nonexistent or significantly smaller than in conventional electrical generators. The design and modelling of a speed air-cored permanent magnetic machine is described. Discussions and conclusions highlight impacts on direct drive design philosophy.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available