Tech Briefs Magazine - August 2021 - 50

APPLICATION
BRIEFS
NASA CO2 Removal System
Integrates High-Speed Blower
Calnetix Technologies
Cerritos, CA
www.calnetix.com
ASA's Four Bed Carbon Dioxide Scrubber (4BCO2) is
planned for installation on the International Space
Station (ISS) after rigorous ground testing. The next-generation
CO2 removal system incorporates a high-speed in-line
blower and dual controller from Calnetix Technologies.
The blower assembly includes a compact in-line blower on
magnetic bearings (Momentumâ„¢) and an integrated hybrid
dual controller (Continuumâ„¢) to drive the blower. The magnetically
levitated in-line blower is an integral component of the
CO2 removal system and will drive the airflow through the
entire system in a microgravity space environment.
Momentum features an overhung permanent magnet
motor; a centrally located, five-axis, active magnetic bearing
(AMB) system; backup bearings; and an overhung centrifugal
impeller in a compact package. Magnetic bearings were used
instead of conventional bearings due to their low transmitted
vibration, high-speed levitation, low power consumption, high
reliability, oil-free operation, and tolerance to particle contaminants
in the air stream.
N
Continuum consists of an AMB controller and a variable
speed drive (VSD) motor controller in a single compact package
that supports speeds up to 60,000 RPM with long-term
maintenance-free operation. The AMBs were utilized to eliminate
lubrication and rotating drag losses, which was an
important aspect in meeting NASA's stringent outgassing
requirements.
To meet the application needs, the in-line blower system
must survive launch vibrations and acceleration requirements,
comply with electromechanical and power quality
requirements under NASA SSP 57000, have a shelf life of 15
years, operate 30,000 hours without requiring maintenance,
and operate with very low conductive and convection cooling
availability. In addition, bearings cannot introduce contaminants,
such as lubricants or grease, into the airstream. The
blower must tolerate the ingestion of particles, such as particles
liberated from the filter media and dust in the cabin air,
without incurring damage.
The main design challenge was to fit the new magnetic bearing
blower into the same space as the foil bearing-supported
heritage blower, which is currently being used on the ISS. The
AMB system with position sensors and backup bearings had to
be miniaturized to fit into a highly constrained space. To create
a compact design, the bearing system was centrally placed to be
used with a centrifugal impeller positioned at the air inlet and
an overhung permanent magnet motor at the outlet side of the
machine. The air flows through an annular passage around the
internal components.
Upon successful use of the magnetic bearing blower on the
ISS, magnetic bearings could also be used in other aerospace
applications such as fluid pumps, reaction wheels, and gyroscopes
that challenge conventional bearing technologies.
For Free Info Visit http://info.hotims.com/79416-116
The Momentum compact in-line blower (left) and the Continuum integrated hybrid dual controller.
50
Cov
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Tech Briefs, August 2021
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Tech Briefs Magazine - August 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - August 2021

Tech Briefs Magazine - August 2021 - Intro
Tech Briefs Magazine - August 2021 - Sponsor
Tech Briefs Magazine - August 2021 - Cov1
Tech Briefs Magazine - August 2021 - Cov2
Tech Briefs Magazine - August 2021 - 1
Tech Briefs Magazine - August 2021 - 2
Tech Briefs Magazine - August 2021 - 3
Tech Briefs Magazine - August 2021 - 4
Tech Briefs Magazine - August 2021 - 5
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Tech Briefs Magazine - August 2021 - Cov3
Tech Briefs Magazine - August 2021 - Cov4
Tech Briefs Magazine - August 2021 - MD-Cov1
Tech Briefs Magazine - August 2021 - MD-Cov2
Tech Briefs Magazine - August 2021 - MD-1
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Tech Briefs Magazine - August 2021 - MD-4
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Tech Briefs Magazine - August 2021 - MD-38
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Tech Briefs Magazine - August 2021 - MD-Cov3
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