skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Axial gap permanent-magnet machine with reluctance poles and PM element covers

Abstract

An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring (26) of non-magnetic material and is further provided with a plurality of permanent magnetic elements (25) for coupling flux that is induced by the magnetic field of the stator assemblies (11, 12). The permanent magnetic elements (25) are spaced apart and reluctance poles (27) are positioned in spaces between the magnetic elements (25) to couple additional flux induced by the magnetic field of the stator assemblies (11, 12). Various constructions and shapes (40-45) for the PM magnetic elements (25) are disclosed, and including PM covers (60) of ferromagnetic material for enhancing q-axis flux in the air gaps (15, 16) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.

Inventors:
 [1];  [1]
  1. Oak Ridge, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
986533
Patent Number(s):
7,514,833
Application Number:
11/228,698; TRN: US201018%%29
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; PERMANENT MAGNETS; ELECTRIC MOTORS; DESIGN; MAGNETIC FLUX; FERROMAGNETIC MATERIALS; MAGNETIC FIELDS; ROTORS; STATORS; TORQUE

Citation Formats

Hsu, John S, and McKeever, John W. Axial gap permanent-magnet machine with reluctance poles and PM element covers. United States: N. p., 2009. Web.
Hsu, John S, & McKeever, John W. Axial gap permanent-magnet machine with reluctance poles and PM element covers. United States.
Hsu, John S, and McKeever, John W. Tue . "Axial gap permanent-magnet machine with reluctance poles and PM element covers". United States. https://www.osti.gov/servlets/purl/986533.
@article{osti_986533,
title = {Axial gap permanent-magnet machine with reluctance poles and PM element covers},
author = {Hsu, John S and McKeever, John W},
abstractNote = {An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring (26) of non-magnetic material and is further provided with a plurality of permanent magnetic elements (25) for coupling flux that is induced by the magnetic field of the stator assemblies (11, 12). The permanent magnetic elements (25) are spaced apart and reluctance poles (27) are positioned in spaces between the magnetic elements (25) to couple additional flux induced by the magnetic field of the stator assemblies (11, 12). Various constructions and shapes (40-45) for the PM magnetic elements (25) are disclosed, and including PM covers (60) of ferromagnetic material for enhancing q-axis flux in the air gaps (15, 16) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {4}
}

Patent:

Save / Share: