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

Patent ·
OSTI ID:1361419
; ;
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.
Research Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EE) (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0005573
Assignee:
GENERAL ELECTRIC COMPANY
Patent Number(s):
9,673,667
Application Number:
14/337,469
OSTI ID:
1361419
Country of Publication:
United States
Language:
English

References (1)

Design and develop of a MW direct drive high-speed permanent-magnet machine for compression conference October 2013

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