Disc rotors with permanent magnets for brushless DC motor

Patent · 01 January 1992

OSTI ID:868314

Hawsey, Robert A ^[1]; Bailey, J Milton ^[2]

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1. Oak Ridge, TN
2. Knoxville, TN

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.

• Research Organization: LOCKHEED MARTIN ENRGY SYST INC
• DOE Contract Number: AC05-84OR21400
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 5117141
• OSTI ID: 868314
• Country of Publication: United States
• Language: English

Related Subjects

/310/440/
annular
annular array
array
autonomous
axially
axially spaced
bearings
bore
brushless
brushless dc
causes
central
central bore
coil
comprises
comprising
concentric
connected
counterrotating
dc
dc motor
directions
disc
disposed
drive
drive unit
driven
drives
embedded
embodiment
flat
hollow
hollow tube
ironless
magnet
magnet motor
magnets
motor
motor drive
motor drives
mounted
opposite
opposite direction
opposite directions
pairs
permanent
permanent magnet
permanent magnets
relationship
rotating shaft
rotating shafts
rotation
rotor
rotors
sets
shaft
shaft comprises
shafts
spaced
stacked
stacked relation
stator
stator coil
stators
substantially
substantially flat
support
tape-wound
therein
tube
underwater
unit
vehe