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. 07, 2009
Filed:
Sep. 16, 2005
John S. Hsu, Oak Ridge, TN (US);
John W. Mckeever, Oak Ridge, TN (US);
John S. Hsu, Oak Ridge, TN (US);
John W. McKeever, Oak Ridge, TN (US);
UT-Battelle LLC, Oak Ridge, TN (US);
Abstract
An electric machine () has a disk-shaped rotor () disposed in an operating space between two opposing stator assemblies () to provide two axial air gaps (). The rotor () has a hub () and an outer ring () of non-magnetic material and is further provided with a plurality of permanent magnetic elements () for coupling flux that is induced by the magnetic field of the stator assemblies (). The permanent magnetic elements () are spaced apart and reluctance poles () are positioned in spaces between the magnetic elements () to couple additional flux induced by the magnetic field of the stator assemblies (). Various constructions and shapes (-) for the PM magnetic elements () are disclosed, and including PM covers () of ferromagnetic material for enhancing q-axis flux in the air gaps () and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.