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Demagnetization using a determined estimated magnetic state

United States Patent

8,934,210
January 13, 2015
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
A method for demagnetizing comprising positioning a core within the electromagnetic field generated by a first winding until the generated first electrical current is not substantially increasing, thereby determining a saturation current. A second voltage, having the opposite polarity, is then applied across the first winding until the generated second electrical current is approximately equal to the magnitude of the determined saturation current. The maximum magnetic flux within the core is then determined using the voltage across said first winding and the second current. A third voltage, having the opposite polarity, is then applied across the first winding until the core has a magnetic flux equal to approximately half of the determined maximum magnetic flux within the core.
Denis; Ronald J. (Camas, WA), Makowski; Nathanael J. (Vancouver, WA)
U.S. Department of Energy (Washington, DC)
13/ 535,637
June 28, 2012
GOVERNMENT INTERESTS The United States Government has rights in this invention pursuant to the employer-employee relationship between the U.S. Department of Energy (DOE) and the inventors at the Bonneville Power Administration.