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Extended cage adjustable speed electric motors and drive packages

United States Patent

March 23, 1999
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.
Hsu; John S. (Oak Ridge, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
08/ 887,019
July 2, 1997
The United States Government has rights in this invention pursuant to contract no. DE-AC05-960R22464 between the United States Department of Energy and Lockheed Martin Energy Research Corporation.