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System and method for preventing stator permanent magnet demagnetization during vacuum pressure impregnation

United States Patent

June 6, 2017
View the Complete Patent 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 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.