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nuckolls.bob(at)aeroelect
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 Posted: Wed Jun 24, 2020 10:27 am Post subject: Current consumption of Facet cube fuel pump |
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At 09:00 AM 6/24/2020, you wrote:
| Quote: | From the product description:
Facet fuel pumps have low power requirements (about 1 amp at 12 volts)
On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly <peter(at)sportingaero.com> wrote:
Does anyone know the power rating (or current consumption) of a Facet 40105 fuel pump when operating at the low pressure end of its range (3 psi)?
Thanks, Peter |
The reciprocating electric fuel pump has a
rich and what is now perhaps ancient history.
Early patents on this technology date back
as far as 1920. Here's a small sample of
patents awarded on this concept over the
past 100 years!
https://tinyurl.com/knsz7y9
The fundamental idea was to have a linear
solenoid compress a spring that pushed
a piston toward the pump's outlet port.
A pair of check valves would (1) allow
the piston to 'suck' fuel on the magnetic
stroke while compressing the spring and
(2) allowing spring force on the
piston to 'push' fuel through the outlet
port. There's an illustrated narrative
of this process attached.
Earliest versions featured electrical
contacts in series with the solenoid
coil that would close when the spring
was at or near full extension. This was
a source of wear and radio noise. Later
improvements added a transistor to reduce
current in the contacts to milliamps
offering very long contact life and
virtually zero electrical noise.
Still later improvements replace the
contacts with a solid state timer that
simply pulses the coil so many times
a minute. If there is no 'demand', i.e.
carb float bowel closed, the piston and
spring assumes fully compressed condition
until flow resumes. Outlet pressure is
set by spring force.
Therefore, energy required to supply this
pump is constant irrespective of pressure
or flow. "Average" current flow may be
on the order of 2A but peak current will
be higher. Given that fuses can be 'hammered'
by repetitive pulses at or near the fuse
rating, one should power these pumps
from a 5A fuse or breaker through
22 or 20AWG wire.
I've got one of these thing laying
around here somewhere . . . I'll see if
I can set it up to capture current
traces to explore the energy signature
for average, peak and RMS values of
current.
Bob . . .
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Peter(at)sportingaero.com
Guest
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| Posted: Wed Jun 24, 2020 1:40 pm Post subject: Current consumption of Facet cube fuel pump |
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Thanks All, I looked all over the interweb for quite a while and couldn’t find the answer!
Peter
From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com> On Behalf Of Robert L. Nuckolls, III
Sent: 24 June 2020 19:23
To: aeroelectric-list(at)matronics.com
Subject: Re: Current consumption of Facet cube fuel pump
At 09:00 AM 6/24/2020, you wrote:
| Quote: |
From the product description:
Facet fuel pumps have low power requirements (about 1 amp at 12 volts)
On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly <peter(at)sportingaero.com (peter(at)sportingaero.com)> wrote:
Does anyone know the power rating (or current consumption) of a Facet 40105 fuel pump when operating at the low pressure end of its range (3 psi)?
Thanks, Peter |
The reciprocating electric fuel pump has a
rich and what is now perhaps ancient history.
Early patents on this technology date back
as far as 1920. Here's a small sample of
patents awarded on this concept over the
past 100 years!
https://tinyurl.com/knsz7y9
The fundamental idea was to have a linear
solenoid compress a spring that pushed
a piston toward the pump's outlet port.
A pair of check valves would (1) allow
the piston to 'suck' fuel on the magnetic
stroke while compressing the spring and
(2) allowing spring force on the
piston to 'push' fuel through the outlet
port. There's an illustrated narrative
of this process attached.
Earliest versions featured electrical
contacts in series with the solenoid
coil that would close when the spring
was at or near full extension. This was
a source of wear and radio noise. Later
improvements added a transistor to reduce
current in the contacts to milliamps
offering very long contact life and
virtually zero electrical noise.
Still later improvements replace the
contacts with a solid state timer that
simply pulses the coil so many times
a minute. If there is no 'demand', i.e.
carb float bowel closed, the piston and
spring assumes fully compressed condition
until flow resumes. Outlet pressure is
set by spring force.
Therefore, energy required to supply this
pump is constant irrespective of pressure
or flow. "Average" current flow may be
on the order of 2A but peak current will
be higher. Given that fuses can be 'hammered'
by repetitive pulses at or near the fuse
rating, one should power these pumps
from a 5A fuse or breaker through
22 or 20AWG wire.
I've got one of these thing laying
around here somewhere . . . I'll see if
I can set it up to capture current
traces to explore the energy signature
for average, peak and RMS values of
current.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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