Cogging torque reduction in axial flux machines for small wind turbines

Hsieh, MF; Dorrell, DG; Yeh, YH; Ekram, S

Cogging torque reduction in axial flux machines for small wind turbines

Hsieh, MF Dorrell, DG

Yeh, YH Ekram, S

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Publication Type:: Conference Proceeding
Citation:: IECON Proceedings (Industrial Electronics Conference), 2009, pp. 4435 - 4439
Issue Date:: 2009-12-01

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Field	Value	Language
dc.contributor.author	Hsieh, MF	en_US
dc.contributor.author	Dorrell, DG https://orcid.org/0000-0001-8060-3386	en_US
dc.contributor.author	Yeh, YH	en_US
dc.contributor.author	Ekram, S	en_US
dc.date.issued	2009-12-01	en_US
dc.identifier.citation	IECON Proceedings (Industrial Electronics Conference), 2009, pp. 4435 - 4439	en_US
dc.identifier.uri	http://hdl.handle.net/10453/11984
dc.description.abstract	This paper presents a technique for cogging torque reduction in an axial-flux permanent-magnet (PM) generator suitable for use in a small wind turbine. These machines can be compact and have high power density; they are axially short with larger diameter which makes then very suitable for a wind turbine. The inherent cogging torque can cause problems during turbine start-up and cut-in. In this paper, a turbine is characterized via the measurement in a wind tunnel. The characteristics are then used to determine the specification for the generator. A method called "hybrid skew" is proposed for cogging torque reduction. 3-D finite element analysis is applied to evaluate the method and a 88 % reduction of peak cogging torque was obtained when combined with another known technique. This significantly improves the turbine performance at low start-up speed while maintaining high power density. The technique can reduce manufacturing confusion in N/S pole placement and allow a simple magnet shape for lower cost manufacturing. ©2009 IEEE.	en_US
dc.relation.ispartof	IECON Proceedings (Industrial Electronics Conference)	en_US
dc.relation.isbasedon	10.1109/IECON.2009.5414896	en_US
dc.title	Cogging torque reduction in axial flux machines for small wind turbines	en_US
dc.type	Conference Proceeding
utslib.for	0913 Mechanical Engineering	en_US
dc.location.activity	Porto, Portugal	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US

Abstract:

This paper presents a technique for cogging torque reduction in an axial-flux permanent-magnet (PM) generator suitable for use in a small wind turbine. These machines can be compact and have high power density; they are axially short with larger diameter which makes then very suitable for a wind turbine. The inherent cogging torque can cause problems during turbine start-up and cut-in. In this paper, a turbine is characterized via the measurement in a wind tunnel. The characteristics are then used to determine the specification for the generator. A method called "hybrid skew" is proposed for cogging torque reduction. 3-D finite element analysis is applied to evaluate the method and a 88 % reduction of peak cogging torque was obtained when combined with another known technique. This significantly improves the turbine performance at low start-up speed while maintaining high power density. The technique can reduce manufacturing confusion in N/S pole placement and allow a simple magnet shape for lower cost manufacturing. ©2009 IEEE.

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http://hdl.handle.net/10453/11984