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Title: 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
Resource Relation:
Patent File Date: 2014 Jul 22
Country of Publication:
United States
Language:
English

References (14)

Permanent magnet-excited assembly of an electrical machine, and process for its manufacture patent January 2001
Permanent magnet type motor and compressor comprising it patent February 2005
Method and apparatus for assembling a permanent magnet pole assembly patent August 2009
Methods and apparatus for preventing demagnetization in interior permanent magnet machines patent November 2010
Hybrid permanent magnet motor patent March 2011
Brushless motor and electric power steering apparatus equipped with the brushless motor patent-application October 2003
Lightweight portable electric generator patent-application March 2005
Lightweight Portable Electric Generator with Integrated Starter/Alternator patent-application October 2007
Tooth Module for a Primary Part, with Permanent-Magnet Excitation, of an Electrical Machine patent-application August 2008
MOTOR patent-application May 2013
IPM MACHINE WITH THERMALLY CONDUCTIVE COMPOUND patent-application October 2013
SPOKE TYPE PERMANENT MAGNET MOTOR patent-application January 2014
PERMANENT MAGNET ROTOR WITH RESIN-COVERED MAGNET AND LAMINATION FOR THERMAL CONTROL patent-application January 2014
Design and develop of a MW direct drive high-speed permanent-magnet machine for compression conference October 2013

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