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Korea Aerospace Research Institute Promising Technologies for Commercialization
Outline of Technology
TLO of the KARI
Person-in-charge
Senior Administrator Moon-Hee, Cho
E-mail : moonyxp@kari.re.kr
R&D Performance Diffusion Division
Three
Dimensional
Rigid Ball driving
System
A three dimensional rigid ball actuation system is a
new concept of next generation actuator that can be
replaced with the conventional general actuator used
for attitude control and momentum storage, and is
capable of accurately controlling the orientation in a
three-axis direction by rotating a spherical fly wheel
in a desired direction.
■ Problems of conventional art
• A conventional actuator operates in a manner of
generating a single axis control torque, and requires at
least three actuators to control an attitude of a satellite
in a three-axis (X, y and Z) direction.
• Since a plurality of actuators are used for the purpose
of three-axis attitude control, there are problems with
an increase in costs, volume and weight, and ensuring
technical/economic competitiveness of a satellite shall
be taken into account.
Rigid ball driving system for controlling attitude of satellite
Inventor
Senior Researcher Kim, Dae-Kwan
Team
Satellite Control Team
Status of right
• US : 9751644
• JP : 6023326
Title
• THREE-DIMENSIONAL RIGID BALL DRIVING
SySTEM
• THREE-DIMENSIONAL RIGID BALL DRIVING SySTEM
Technical features and
advantages
Distinctiveness
• A single actuator enables three-axis control of
a satellite, and thus lightweight, small in size
and a reduction in cost can be implemented.
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Lab-scale basic performance verification
Technical Readiness Level
TRL 1
TRL 2
TRL 5
TRL 6
TRL 7
TRL 8
TRL 9
TRL 4
Technical features and advantages
Technical detail
TRL 3
Technical effects
• A torque generated by Lorentz’s force between a rotating magnetic field and an induced current is
used for a spherical (3D) fly wheel.
• The spherical fly wheel can rotate in a three dimensional direction, and a torque in a three-axis
direction is generated.
• Analysis of driving characteristics through design and manufacturing of a one-dimensional
spherical actuator model and performance test
3D Rotation Driving System
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Technical detail
Three
Dimensional
Rigid Ball driving
System
• Design of 3D spherical actuator and interpretation of speed
control (S/W), and development of 3D spherical actuator
test products (H/W)
Internal/External Configuration
Segway (conceptual diagram)
Application example
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• CNG is employed to substitute the conventional actuator for controlling an attitude of a satellite.
• This technology has been drawing an increasing amount of attention as the next generation
attitude control actuator covering the field of space and underwater robotics, vessels, flight,
precision motors as well as small satellites.
Applications
Market and future prospect
For the next 10 years from 2013 to 2022, the U.S., Russia, Europe (France and Italy), Japan, China,
India, and Israel are capable of operating low earth orbit and geostationary orbit launch vehicle,
and launch vehicles that have been operated and under development by the countries are 46. The
launch vehicle market size is estimated to produce 739 vehicles, and to reach a sales of fifty-eight
billion, four hundred million, nine hundred twenty thousand USD for the next 10 years.
Estimate of demand for launching a satellite for the next 10 years
Identification
2003~2012
2013~2022
Increase/decrease
Number of launching satellite
809 satellites
1,151 satellites
+42%
Total weight of
launched satellites
1,824 tons
2,397 tons
+31%
Satellite market
142 billion UDS
1,81 billion UDS
+27%
Launching service market
45 billion USD
55 billion UDS
+23%
Sum of satellite +
launching service markets
187 billion USD
2,36 billion UDS
+26%