Outer-rotor ac homopolar motors for flywheel energy storage

E. Severson, R. Nilssen, T. Undeland, N. Mohan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Flywheel energy storage technology has been successfully commercialized for applications requiring high power, high cycle-life, and short storage intervals. High idling losses have prevented the use of flywheel technology in applications that require longer storage intervals, such as grid-based, load-following energy storage. This paper proposes the use of an outer-rotor ac homopolar motor to significantly decrease idling losses, increase energy density, and decrease cost. Motor sizing equations, a comparison to the typically-used permanent magnet motor, and 3D finite element analysis of an example design are presented. It is shown that for high-performance flywheel designs, the ac homopolar motor can have a torque density comparable to that of a permanent magnet motor.

Original languageEnglish (US)
Title of host publication7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014
PublisherInstitution of Engineering and Technology
Volume2014
Edition628 CP
ISBN (Print)9781849198158
StatePublished - 2014
Event7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014 - Manchester, United Kingdom
Duration: Apr 8 2014Apr 10 2014

Publication series

Name7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014

Other

Other7th IET International Conference on Power Electronics, Machines and Drives, PEMD 2014
CountryUnited Kingdom
CityManchester
Period4/8/144/10/14

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