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System and method for heating ferrite magnet motors for low temperatures

United States Patent

9,698,660
July 4, 2017
View the Complete Patent at the US Patent & Trademark Office
A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
Reddy; Patel Bhageerath (Niskayuna, NY), El-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Huh; Kum-Kang (Niskayuna, NY)
GENERAL ELECTRIC COMPANY (Schenectady, NY)
14/ 063,547
20150115757
October 25, 2013
GOVERNMENT LICENSE RIGHTS This invention was made with Government support under contract number DE-EE0005573 awarded by the United States Department of Energy. The Government has certain rights in the invention.