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Title: Direct control of air gap flux in permanent magnet machines

Abstract

A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.

Inventors:
 [1]
  1. Oak Ridge, TN
Publication Date:
Research Org.:
LOCKHEED MARTIN ENERGY RES COR
OSTI Identifier:
872981
Patent Number(s):
US 6057622
Assignee:
Lockhead Martin Energy Research Corporation (Oak Ridge, TN)
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
direct; control; air; gap; flux; permanent; magnet; machines; method; apparatus; field; weakening; coils; 35; 44; 45; 71; 72; produce; stators; 34; 49; 63; 64; including; counters; normally; produced; gaps; stator; rotor; 20; 21; 41; 61; carries; poles; modes; operation; introduced; depending; magnitude; polarity; current; particularly; useful; limited; electric; vehicle; drives; generators; vehicle drive; air gap; electric vehicle; permanent magnet; particularly useful; normally produced; air gaps; field weakening; /310/

Citation Formats

Hsu, John S. Direct control of air gap flux in permanent magnet machines. United States: N. p., 2000. Web.
Hsu, John S. Direct control of air gap flux in permanent magnet machines. United States.
Hsu, John S. Sat . "Direct control of air gap flux in permanent magnet machines". United States. https://www.osti.gov/servlets/purl/872981.
@article{osti_872981,
title = {Direct control of air gap flux in permanent magnet machines},
author = {Hsu, John S},
abstractNote = {A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

Patent:

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