The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2009
Filed:
Sep. 21, 2005
John S. Hsu, Oak Ridge, TN (US);
John S. Hsu, Oak Ridge, TN (US);
UT-Battelle, LLC, Oak Ridge, TN (US);
Abstract
A method and apparatus in which a rotor () and a stator () define a radial air gap () for receiving AC flux and at least one DC excitation coil () positioned near the stator end turn to produce DC flux in axial air gaps () additive to the AC flux. Side magnets () and flux-guiding magnets () are provided as boundaries separating the side poles () of opposite polarity from other portions of the rotor () and from each other to define PM poles () for conveying the DC flux to or from the primary air gap () and for inhibiting flux from leaking from said pole portions prior to reaching the primary air gap (). Side magnets (), side poles (and), flux-guiding magnets (), ferromagnetic end plates (), non-magnetic end plates (), and ring bands () are optionally provided for performance improvement.