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Permanent-magnet switched-flux machine

United States Patent

February 21, 2012
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A permanent-magnet switched-flux (PMSF) device has an outer rotor mounted to a shaft about a central axis extending axially through the PMSF device. First and second pluralities of permanent-magnets (PMs) are respectively mounted in first and second circles, radially outwardly in first and second transverse planes extending from first and second sections of the central axis adjacent to an inner surface of the outer rotor. An inner stator is coupled to the shaft and has i) a stator core having a core axis co-axial with the central axis; and ii) first and second pluralities of stator poles mounted in first and second circles, radially outwardly from the stator core axis in the first and second transverse planes. The first and second pluralities of PMs each include PMs of alternating polarity.
Trzynadlowski; Andrzej M. (Reno, NV), Qin; Ling (Reno, NV)
Board of Regents of the Nevada System of Higher Education, on behalf of the University of Nevada, Reno (Reno, NV), N/A (
13/ 116,180
May 26, 2011
The United States Government has a paid-up license in this invention, and the right in limited circumstances to require the patent owner to license others on reasonable terms, as provided for by the terms of contract No. ACL-3-32455-07 awarded by the National Renewable Energy Laboratory (NREL).