Design Optimization of a Direct-Drive Wind Generator With a Reluctance Rotor and a Flux Intensifying Stator Using Different PM Types

This paper presents a large-scale multi-objective design optimization for a direct-drive wind turbine generator concept that is based upon an experimentally validated computational model for a small-scale prototype motor of the same type. By integrating an outer reluctance-type rotor and a segmented...

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Published inIEEE transactions on industry applications Vol. 60; no. 4; pp. 6113 - 6123
Main Authors Mohammadi, Ali, Badewa, Oluwaseun A., Chulaee, Yaser, Lewis, Donovin D., Essakiappan, Somasundaram, Manjrekar, Madhav D., Ionel, Dan M.
Format Journal Article
LanguageEnglish
Published IEEE 01.07.2024
Subjects
design optimization
Direct-drive generator
double-salient
flux-intensifying topology
flux-reversal
flux-switching
Generators
Prototypes
Rotors
spoke permanent magnets
Stator windings
synchronous machine
Topology
toroidal winding
wind turbine
Wind turbines
Windings
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Summary:This paper presents a large-scale multi-objective design optimization for a direct-drive wind turbine generator concept that is based upon an experimentally validated computational model for a small-scale prototype motor of the same type. By integrating an outer reluctance-type rotor and a segmented stator with toroidally wound single-coil modules containing spoke-type PMs, the design optimization aims to minimize losses, active mass, and torque ripple while adhering to a power factor constraint. The AC windings and PMs are positioned in the stator and this concept enhances flux concentration, enabling the use of more affordable high energy non-rare-earth (special type) magnets. The exterior rotor follows a simplified reluctance-type configuration, eliminating active electromagnetic components. The operational principle, described in detail, guides design studies using electromagnetic 2D finite element analysis (FEA), showcasing the potential of this configuration to match rare-earth PM performance, with special type PMs, thus addressing cost and supply challenges. Furthermore, alternative materials including the substitution of aluminum wire for copper wire, have also been investigated in this study. The proposed multi-objective design optimization uses the response surface method (RSM) to initiate the optimization and the results on a 3MW, 15 rpm generator, highlight the benefits of this topology, achieving competitive metrics like goodness, specific thrust, and efficiency without rare-earth permanent magnets.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2024.3396792