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Title: Magnet management in electric machines

A magnet management method of controlling a ferrite-type permanent magnet electrical machine includes receiving and/or estimating the temperature permanent magnets; determining if that temperature is below a predetermined temperature; and if so, then: selectively heating the magnets in order to prevent demagnetization and/or derating the machine. A similar method provides for controlling magnetization level by analyzing flux or magnetization level. Controllers that employ various methods are disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1347536
Assignee:
General Electric Company DOEEE
Patent Number(s):
9,602,043
Application Number:
14/473,216
Contract Number:
EE0005573
Resource Relation:
Patent File Date: 2014 Aug 29
Research Org:
General Electric Company, Niskayuna, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS

Works referenced in this record:

The Ferrite Permanent Magnet AC Motor---A Technical and Economical Assessment
journal, May 1985
  • Richter, Eike; Miller, Timothy J. E.; Neumann, Thomas W.
  • IEEE Transactions on Industry Applications, Vol. IA-21, Issue 3, p. 644-650
  • DOI: 10.1109/TIA.1985.349721

Rotor structure for reducing demagnetization of magnet in a PMASynRM with ferrite permanent magnet and its characteristics
conference, September 2011
  • Sanada, Masayuki; Inoue, Yukinori; Morimoto, Shigeo
  • 2011 IEEE Energy Conversion Congress and Exposition
  • DOI: 10.1109/ECCE.2011.6064340