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Give source on motor power estimate

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compare to large sunon fan
This commit is contained in:
jaseg 2021-07-13 15:58:30 +02:00
parent f08eea06ee
commit a6e1408504
2 changed files with 14 additions and 8 deletions
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12
paper/Makefile
View file

@ -15,16 +15,18 @@ brief_tex ?= ihsm_tech_report
sub_stem ?= cant-touch-this-ihsm-paper
VERSION_STRING := $(shell git describe --tags --long --dirty)
SHORT_VERSION_STRING := $(shell git describe --tags)
all: ${main_tex}.pdf ${brief_tex}.pdf
.PHONY: submission-outputs
submission: diff cover-letter ${main_tex}.pdf
cp ${main_tex}.pdf ${sub_stem}-${VERSION_STRING}.pdf
cp ${main_tex}_diff.pdf ${sub_stem}-${VERSION_STRING}-diff.pdf
cp tches-22-01-changes.pdf ${sub_stem}-${VERSION_STRING}-cover-letter.pdf
rm -f ${sub_stem}-${VERSION_STRING}-supplementary.zip
zip -r ${sub_stem}-${VERSION_STRING}-supplementary.zip ${sub_stem}-${VERSION_STRING}-diff.pdf ${sub_stem}-${VERSION_STRING}-cover-letter.pdf
cp ${main_tex}.pdf ${sub_stem}-${SHORT_VERSION_STRING}-revised.pdf
cp ${main_tex}_diff.pdf ${sub_stem}-${SHORT_VERSION_STRING}-diff.pdf
cp cant-touch-this-ihsm-paper-v2.0.pdf cant-touch-this-ihsm-paper-v2.0-original.pdf
cp tches-22-01-changes.pdf ${sub_stem}-${SHORT_VERSION_STRING}-cover-letter.pdf
rm -f ${sub_stem}-${SHORT_VERSION_STRING}-supplementary.zip
zip -r ${sub_stem}-${SHORT_VERSION_STRING}-supplementary.zip ${sub_stem}-${SHORT_VERSION_STRING}-diff.pdf ${sub_stem}-${SHORT_VERSION_STRING}-cover-letter.pdf ${sub_stem}-${SHORT_VERSION_STRING}-revised.pdf cant-touch-this-ihsm-paper-v2.0-original.pdf
.PHONY: cover-letter
cover-letter: tches-22-01-changes.pdf

10
paper/ihsm_paper.tex
View file

@ -420,9 +420,13 @@ motor requires more power than the mesh monitoring circuit of a traditional HSM.
Uninterruptible Power Supply (UPS) can be used, but in practice a productized IHSM might have a smaller backup battery
integrated into its case. Conservatively assuming an average operating power consumption of $\SI{10}{\watt}$ for an
IHSM's motor, a single large laptop battery with a capacity of $\SI{100}{\watt\hour}$~\cite{faa2018} could already power
an IHSM for 10 hours continuously. If a built-in battery is undesirable, or if power outages of more than a few seconds
at a time are unlikely (e.g.\ because the IHSM is connected to an external UPS or generator), the IHSM's rotor itself
can be used as a flywheel for energy storage.
an IHSM for 10 hours continuously. $\SI{10}{\watt}$ is a reasonable high estimate given that there are large industrial
fans rated at lower wattages. For example, \texttt{CF2207LBL-000U-HB9}, a $\SI{250}{\milli\meter}$ diameter
$\SI{7.8}{\meter^3\per\minute}$ industrial axial fan made by Sunon is rated at only
$\SI{6.6}{\watt}$\footnote{\url{https://www.digikey.com/en/products/detail/sunon-fans/CF2207LBL-000U-HB9/9083282}}. If
a built-in battery is undesirable, or if power outages of more than a few seconds at a time are unlikely (e.g.\ because
the IHSM is connected to an external UPS or generator), the IHSM's rotor itself can be used as a flywheel for energy
storage.
\paragraph{Spurious alarms.}
Even with all components working to their specification, an IHSM could still catastrophically fail if for some reason