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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
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
872981
Patent Number(s):
6057622
Assignee:
Lockhead Martin Energy Research Corporation (Oak Ridge, TN)
Patent Classifications (CPCs):
H - ELECTRICITY H02 - GENERATION H02K - DYNAMO-ELECTRIC MACHINES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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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Works referenced in this record:

Field-weakening performance of brushless synchronous AC motor drives
journal, January 1994


High power density electric drive for an hybrid electric vehicle
conference, January 1998


Adaptive flux weakening control of permanent magnet synchronous motors
conference, January 1998


Operating Limits of Inverter-Driven Permanent Magnet Motor Drives
journal, March 1987


Expansion of operating limits for permanent magnet motor by current vector control considering inverter capacity
journal, January 1990