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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

Other works cited in this record:

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 2012

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

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