Is that a cpu fan brushless motor generating? I am working on a motorbike based alternator for magnets on the flywheel but if that's a brushless the friction is minimal and big gearing! good idea.
Yes, it is a brushless CPU fan motor with the wings cut off. The contact with the flywheel (several harddisk platters bolted together) is via a rubber o-ring slipped onto the fan.
Dunno. Free piston Stirling (as any Stirling for that matter) will not work without flywheel, in free piston one it is needed to produce the inertial overdrive that causes pressure variations needed to move the displacer push rod.
There is a case for Stirling design with linear alternator when the engine is fully sealed in the pressurised Hydrogen and its piston is connected to a permanent magnet whose movement induces current in the coils wound around the containment box.
yes that's what i mean. Pressurised Hydrogen is not required, but i suppose it does help. I think it would be easier for the hobbyist to just use air.
The fully sealed nature of it is a big advantage as there are few moving parts and no seals! So it should be simpler & easier right?
Not sure. It would still require a flywheel inside the sealed chamber so the mechanical linkage would still be required. Pressurisation increases heat conductivity of gas and as a result increases power output of the heat engine as gas expands and contracts more.
The other problem with the sealed engine for the hobbyist is how to deliver the heat to the hot heat exchanger and remove the waste heat from the cold one. This type of problems require industrial-type facilities to overcome.
I've seen a design on the Web of a 4-cylinder fully sealed SE. The cylinders are arranged around the common axle (like bullets in a revolver). The pistons are phased 90 degrees from each other and are set to push the swashplate. The total design is pretty compact, beta-configuration.
I would disagree to some extent I have seen a co2 container used with a stirling inside to dampen noise and seal. The hot cap potruded out top and a water jacket tube entered and exited. They were using helium and cranking arc like power albiet small tesla type arc.
2" 15 grand made that machine. The patentented NW four cylinder is a good grinder gear type machine but complex for consumer production which is what the world needs. imo
very cool setup!
elvaxo 1 year ago
Is that a cpu fan brushless motor generating? I am working on a motorbike based alternator for magnets on the flywheel but if that's a brushless the friction is minimal and big gearing! good idea.
441rider 4 years ago
Yes, it is a brushless CPU fan motor with the wings cut off. The contact with the flywheel (several harddisk platters bolted together) is via a rubber o-ring slipped onto the fan.
blg53 4 years ago
The generator produces AC voltage, so I passed it through a rectifier-tripler before loading onto the LEDs.
blg53 4 years ago
Maybe the rc airplane brushless motors could pump more juice? good work. What tripler did you use is it a 3 pole type chip?
441rider 4 years ago
Thanks. I think the motor doesn't limit the power too much, it's the Stirling engine itself that needs a bit of a Viagra treatment.
blg53 4 years ago
Tripler is a simple 3 diodes 3 capacitors circuit . You can Google it by searching on "voltage tripler"
blg53 4 years ago
As in w w w dot hyperphysics dot phy-astr dot gsu dot edu slash hbase slash electronic slash voldoub dot html
blg53 4 years ago
What about a free piston stirling with no flywheel - hooked upto a linear alternator?
I hope to see more people attempt this
roidroid 4 years ago
Dunno. Free piston Stirling (as any Stirling for that matter) will not work without flywheel, in free piston one it is needed to produce the inertial overdrive that causes pressure variations needed to move the displacer push rod.
blg53 4 years ago
There is a case for Stirling design with linear alternator when the engine is fully sealed in the pressurised Hydrogen and its piston is connected to a permanent magnet whose movement induces current in the coils wound around the containment box.
blg53 4 years ago
yes that's what i mean. Pressurised Hydrogen is not required, but i suppose it does help. I think it would be easier for the hobbyist to just use air.
The fully sealed nature of it is a big advantage as there are few moving parts and no seals! So it should be simpler & easier right?
roidroid 4 years ago
Not sure. It would still require a flywheel inside the sealed chamber so the mechanical linkage would still be required. Pressurisation increases heat conductivity of gas and as a result increases power output of the heat engine as gas expands and contracts more.
blg53 4 years ago
The other problem with the sealed engine for the hobbyist is how to deliver the heat to the hot heat exchanger and remove the waste heat from the cold one. This type of problems require industrial-type facilities to overcome.
blg53 4 years ago
I've seen a design on the Web of a 4-cylinder fully sealed SE. The cylinders are arranged around the common axle (like bullets in a revolver). The pistons are phased 90 degrees from each other and are set to push the swashplate. The total design is pretty compact, beta-configuration.
blg53 4 years ago
I would disagree to some extent I have seen a co2 container used with a stirling inside to dampen noise and seal. The hot cap potruded out top and a water jacket tube entered and exited. They were using helium and cranking arc like power albiet small tesla type arc.
2" 15 grand made that machine. The patentented NW four cylinder is a good grinder gear type machine but complex for consumer production which is what the world needs. imo
441rider 4 years ago
Is it on a Web anywhere ?
blg53 4 years ago
no flywheel. I think they use a "Thermo-acoustic" type stirling cycle, fully sealed, with a free piston and linear alternator.
Perhaps they are still too cutting edge for hobbyists :(.
Seperating the cold side from the hot side on a sealed chamber must be difficult, good point!
roidroid 4 years ago
a youtube user named BARUMMAN has recently uploaded some videos of his free piston Stirlings that appear to have linear electric generators
roidroid 3 years ago
Nicely done!
svofski 4 years ago
Cheers mate. Sorry about the jerkiness.
blg53 4 years ago