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Title: Disc rotors with permanent magnets for brushless DC motor

Abstract

A brushless dc permanent magnet motor drives an autonomous underwater vehe. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and a drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. Two different sets of bearings support the first and second shafts. In another embodiment, the motor comprises two ironless stators and pairs of rotors mounted on opposite sides of the stators and driven by counterrotating shafts.

Inventors:
 [1];  [2]
  1. (Oak Ridge, TN)
  2. (Knoxville, TN)
Publication Date:
Research Org.:
LOCKHEED MARTIN ENRGY SYST INC
OSTI Identifier:
868314
Patent Number(s):
US 5117141
Assignee:
United States of America as represented by Department of Energy (Washington, DC) ORNL
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
disc; rotors; permanent; magnets; brushless; dc; motor; magnet; drives; autonomous; underwater; vehe; embodiment; comprises; substantially; flat; stators; stacked; relationship; pairs; axially; spaced; comprising; tape-wound; stator; coil; disposed; annular; array; embedded; therein; shaft; connected; rotor; concentric; drive; unit; causes; rotation; shafts; opposite; directions; hollow; tube; central; bore; sets; bearings; support; ironless; mounted; driven; counterrotating; motor drives; stacked relation; hollow tube; annular array; substantially flat; opposite direction; motor drive; opposite directions; permanent magnet; permanent magnets; central bore; rotating shaft; dc motor; axially spaced; drive unit; stator coil; magnet motor; rotating shafts; shaft comprises; brushless dc; /310/440/

Citation Formats

Hawsey, Robert A., and Bailey, J. Milton. Disc rotors with permanent magnets for brushless DC motor. United States: N. p., 1992. Web.
Hawsey, Robert A., & Bailey, J. Milton. Disc rotors with permanent magnets for brushless DC motor. United States.
Hawsey, Robert A., and Bailey, J. Milton. Wed . "Disc rotors with permanent magnets for brushless DC motor". United States. https://www.osti.gov/servlets/purl/868314.
@article{osti_868314,
title = {Disc rotors with permanent magnets for brushless DC motor},
author = {Hawsey, Robert A. and Bailey, J. Milton},
abstractNote = {A brushless dc permanent magnet motor drives an autonomous underwater vehe. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and a drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. Two different sets of bearings support the first and second shafts. In another embodiment, the motor comprises two ironless stators and pairs of rotors mounted on opposite sides of the stators and driven by counterrotating shafts.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

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