Disc rotors with permanent magnets for brushless DC motor

Patent · Wed Jan 01 00:00:00 EST 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: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• 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

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
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