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

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.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1361419
Assignee:
GENERAL ELECTRIC COMPANY DOEEE
Patent Number(s):
9,673,667
Application Number:
14/337,469
Contract Number:
EE0005573
Resource Relation:
Patent File Date: 2014 Jul 22
Research Org:
USDOE Office of Energy Efficiency and Renewable Energy (EE) (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Works referenced in this record: