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Magnet management in electric machines

United States Patent

9,602,043
March 21, 2017
View the Complete Patent at the US Patent & Trademark Office
A magnet management method of controlling a ferrite-type permanent magnet electrical machine includes receiving and/or estimating the temperature permanent magnets; determining if that temperature is below a predetermined temperature; and if so, then: selectively heating the magnets in order to prevent demagnetization and/or derating the machine. A similar method provides for controlling magnetization level by analyzing flux or magnetization level. Controllers that employ various methods are disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
Reddy; Patel Bhageerath (Niskayuna, NY), El-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Huh; Kum Kang (Niskayuna, NY)
General Electric Company (Niskayuna, NY)
14/ 473,216
20160065112
August 29, 2014
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.