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**Harvard**

Grauers, A. (1996) *Design of Direct-driven Permanent-magnet Generators for Wind Turbines*. Göteborg : Chalmers University of Technology (Technical report - School of Electrical and Computer Engineering, Chalmers University of Technology, Göteborg, Sweden, nr: 292).

** BibTeX **

@book{

Grauers1996,

author={Grauers, Anders},

title={Design of Direct-driven Permanent-magnet Generators for Wind Turbines},

abstract={This thesis presents an investigation of how a direct-driven wind turbine generator should be designed and how small and efficient such a generator will be. Advantages and disadvantages of various types of direct-driven wind turbine generators are discussed, and a radial-flux permanent-magnet generator connected to a forced-commutated rectifier is chosen for a detailed theoretical investigation. Further, a design method is developed for the electromagnetic part of the chosen generator type. The generator is optimized with a simplified cost function which, besides including the cost of the active generator parts and the cost of the structure, also includes the cost of the average losses. Therefore, a method to calculate the average losses is derived. The design method is used to investigate the optimization of a 500 kW generator, and the size, efficiency and active weight of optimized generators from 30 kW to 3 MW are presented. A result of the investigation is that the outer diameters of the direct-driven generators are only slightly larger than the width of conventional wind energy converter nacelles. A comparison of average efficiency shows that direct-driven generators, including the losses in the frequency converters, are more efficient than conventional wind energy converter drive trains. Compared with other direct-driven generators, the proposed generator type is small, mainly because of the forced-commutated rectifier and because the generator is not required to produce a pull-out torque higher than the rated torque.},

publisher={Institutionen för elkraftteknik, Elmaskinteknik och kraftelektronik, Chalmers tekniska högskola,},

place={Göteborg},

year={1996},

series={Technical report - School of Electrical and Computer Engineering, Chalmers University of Technology, Göteborg, Sweden, no: 292},

keywords={permanent magnet, direct drive, low speed, synchronous generator, wind turbine, frequency converter, design, optimization},

}

** RefWorks **

RT Dissertation/Thesis

SR Electronic

ID 1044

A1 Grauers, Anders

T1 Design of Direct-driven Permanent-magnet Generators for Wind Turbines

YR 1996

AB This thesis presents an investigation of how a direct-driven wind turbine generator should be designed and how small and efficient such a generator will be. Advantages and disadvantages of various types of direct-driven wind turbine generators are discussed, and a radial-flux permanent-magnet generator connected to a forced-commutated rectifier is chosen for a detailed theoretical investigation. Further, a design method is developed for the electromagnetic part of the chosen generator type. The generator is optimized with a simplified cost function which, besides including the cost of the active generator parts and the cost of the structure, also includes the cost of the average losses. Therefore, a method to calculate the average losses is derived. The design method is used to investigate the optimization of a 500 kW generator, and the size, efficiency and active weight of optimized generators from 30 kW to 3 MW are presented. A result of the investigation is that the outer diameters of the direct-driven generators are only slightly larger than the width of conventional wind energy converter nacelles. A comparison of average efficiency shows that direct-driven generators, including the losses in the frequency converters, are more efficient than conventional wind energy converter drive trains. Compared with other direct-driven generators, the proposed generator type is small, mainly because of the forced-commutated rectifier and because the generator is not required to produce a pull-out torque higher than the rated torque.

PB Institutionen för elkraftteknik, Elmaskinteknik och kraftelektronik, Chalmers tekniska högskola,

T3 Technical report - School of Electrical and Computer Engineering, Chalmers University of Technology, Göteborg, Sweden, no: 292

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/1044/1044.pdf

OL 30