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Title: Method and radial gap machine for high strength undiffused brushless operation

Abstract

A radial gap brushless electric machine (30) having a stator (31) and a rotor (32) and a main air gap (34) also has at least one stationary excitation coil (35a, 36a) separated from the rotor (32) by a secondary air gap (35e, 35f, 36e, 36f) so as to induce a secondary flux in the rotor (32) which controls a resultant flux in the main air gap (34). Permanent magnetic (PM) material (38) is disposed in spaces between the rotor pole portions (39) to inhibit the second flux from leaking from the pole portions (39) prior to reaching the main air gap (34). By selecting the direction of current in the stationary excitation coil (35a, 36a) both flux enhancement and flux weakening are provided for the main air gap (34). A method of non-diffused flux enhancement and flux weakening for a radial gap machine is also disclosed.

Inventors:
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175973
Patent Number(s):
7,129,611
Application Number:
10/668,586
Assignee:
UT-Battelle LLC (Oak Ridge, TN)
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Hsu, John S. Method and radial gap machine for high strength undiffused brushless operation. United States: N. p., 2006. Web.
Hsu, John S. Method and radial gap machine for high strength undiffused brushless operation. United States.
Hsu, John S. Tue . "Method and radial gap machine for high strength undiffused brushless operation". United States. https://www.osti.gov/servlets/purl/1175973.
@article{osti_1175973,
title = {Method and radial gap machine for high strength undiffused brushless operation},
author = {Hsu, John S.},
abstractNote = {A radial gap brushless electric machine (30) having a stator (31) and a rotor (32) and a main air gap (34) also has at least one stationary excitation coil (35a, 36a) separated from the rotor (32) by a secondary air gap (35e, 35f, 36e, 36f) so as to induce a secondary flux in the rotor (32) which controls a resultant flux in the main air gap (34). Permanent magnetic (PM) material (38) is disposed in spaces between the rotor pole portions (39) to inhibit the second flux from leaking from the pole portions (39) prior to reaching the main air gap (34). By selecting the direction of current in the stationary excitation coil (35a, 36a) both flux enhancement and flux weakening are provided for the main air gap (34). A method of non-diffused flux enhancement and flux weakening for a radial gap machine is also disclosed.},
doi = {},
url = {https://www.osti.gov/biblio/1175973}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {10}
}

Patent:

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