Low backlash direct drive actuator
Patent
·
OSTI ID:869579
- Oakland, CA
A low backlash direct drive actuator is described which comprises a motor such as a stepper motor having at least 200 steps per revolution; a two part hub assembly comprising a drive hub coaxially attached to the shaft of the motor and having a plurality of drive pins; a driven hub having a plurality of bores in one end thereof in alignment with the drive pins in the drive hub and a threaded shaft coaxially mounted in an opposite end of the driven hub; and a housing having a central bore therein into which are fitted the drive hub and driven hub, the housing having a motor mount on one end thereof to which is mounted the stepper motor, and a closed end portion with a threaded opening therein coaxial with the central bore in the housing and receiving therein the threaded shaft attached to the driven hub. Limit switches mounted to the housing cooperate with an enlarged lip on the driven hub to limit the lateral travel of the driven hub in the housing, which also acts to limit the lateral travel of the threaded shaft which functions as a lead screw.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 5359246
- OSTI ID:
- 869579
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/310/464/
200
actuator
alignment
assembly
assembly comprising
attached
backlash
backlash direct
bore
bore therein
bores
central
central bore
closed
coaxial
coaxially
coaxially attached
coaxially mounted
comprises
comprising
cooperate
described
direct
direct drive
drive
drive actuator
driven
enlarged
fitted
functions
housing
hub
lateral
lead
lead screw
limit
lip
motor
motor mount
mount
mounted
opposite
pins
plurality
portion
receiving
revolution
screw
shaft
stepper
stepper motor
steps
switches
therein
threaded
travel
200
actuator
alignment
assembly
assembly comprising
attached
backlash
backlash direct
bore
bore therein
bores
central
central bore
closed
coaxial
coaxially
coaxially attached
coaxially mounted
comprises
comprising
cooperate
described
direct
direct drive
drive
drive actuator
driven
enlarged
fitted
functions
housing
hub
lateral
lead
lead screw
limit
lip
motor
motor mount
mount
mounted
opposite
pins
plurality
portion
receiving
revolution
screw
shaft
stepper
stepper motor
steps
switches
therein
threaded
travel