Skip to Content
Find More Like This
Return to Search

SYSTEM AND METHOD FOR PREVENTING STATOR PERMANENT MAGNET DEMAGNETIZATION DURING VACUUM PRESSURE IMPREGNATION

United States Patent Application

20160028276
A1
View the Complete Application at the US Patent & Trademark Office
A permanent magnet electrical machine includes a stator having conductive windings wound thereon and one or more permanent magnets embedded in the stator. A magnetic keeper element is positioned on the stator so as to form a magnetic flux path with the permanent magnets, with the magnetic keeper element closing the magnetic flux path of the permanent magnets by providing a low reluctance flux path to magnetic flux generated by the permanent magnets. A vacuum pressure impregnation (VPI) process is performed on the stator to increase a thermal conductivity of the windings, with the VPI process including a curing step that is performed at a selected temperature. The magnetic keeper element sets an operating point of the permanent magnets to an internal flux density level above a demagnetization threshold associated with the selected temperature at which the curing step is performed.
Raminosoa, Tsarafidy (Niskayuna, NY), Alexander, James Pellegrino (Ballston Lake, NY), EL-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY)
14/ 337,469
July 22, 2014
GOVERNMENT LICENSE RIGHTS [0001] 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.