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Electric machine

United States Patent

8,633,627
January 21, 2014
View the Complete Patent at the US Patent & Trademark Office
A permanent magnet machine includes a stator having a stator core, a plurality of stator teeth and plurality of stator windings coupled to the stator core. The stator is configured to generate a stator magnetic rotating field when the stator windings are excited with an electric current. The stator magnetic rotating field includes both synchronous sub-harmonic and super-harmonic components. The permanent magnet machine also includes a rotor that is disposed within the stator. The rotor includes a rotor core and a plurality of rotor magnets that are coupled to the rotor core. The rotor magnets are further configured to have a predefined orientation profile such that when the stator windings are excited with an electric current, sub-harmonic and super-harmonic magnetic rotating fields are generated in the rotor magnetic field. The stator sub-harmonic and super-harmonic magnetic rotating fields interact with the rotor sub-harmonic and super-harmonic magnetic rotating fields and produce an aiding torque on in the permanent magnet machine.
El-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Alexander; James Pellegrino (Niskayuna, NY), Reddy; Patel Bhageerath (Schenectady, NY), Shah; Manoj Ramprasad (Latham, NY)
General Electric Company (Niskayuna, NY)
13/ 220,848
20130049513
August 30, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number DE-FC26-07NT43122 awarded by the U.S. Dept. of Energy. The Government has certain rights in the invention