Does the stepper motor take more power to run than the small sterling engine can produce? I can see this being very useful on larger sterling engines though.
If i am not wrong, that Big stepper motor is a HP printer stepper motor, part number is PM55*****. Quite powerful for its size and produces significant power just using my hand to turn it.
This is a really interesting idea. I wonder if you could also just have a solenoid drive the displacer, and have the activating switch be mechanically triggered by the piston position.
That's a good way of looking at it. Several parameters are sensed which changes the phase between the power piston and displacer to produce maximum output power. Yes the engine does produce enough power to drive the electronics but at this stage I haven't bothered to add a generator to it.
This is awesome. I take it the stepper motor doesn't use up more power than the generator is capable of producing?
I'm interested in building a stirling genset for an electric car (turning it into a series hybrid) in the future. Though I need the EV first so it won't be for a while.
The secret to keep the stepper motor consumption down to an acceptable level is to use a chopper drive such as the L298 driven by an L297 IC. This would be suitable for a larger capacity engine.
The noise on the sound track is not on the original video. It happened in the upload process. Can't contact Youtube to re install. Any suggestions would be appreciated.
Initially I connected the stepper directly to the displacer and found that the motor stalled when its RPM exceeded the max revs of the stepper. This was solved by the 2 to 1 ratio gears that reduced the stepper speed to half. It now is stable and will run for hours. To make the stepper run at high revs I fed it with a constant current source driver.
What do you think of this idea?...On a car,take apart the engine,hook this up to the crankshaft and connect an element(which is powered by the battery/alternator) to the heated part!
I think we all agree that free energy is impossible. Infact current Sterling engines would be lucky if they were 10% efficient. The aim is to improve them.
Depends on how you mean by efficient. Currently Stirling engines are the most efficient at converting solar energy into power. Under the proper circumstances the Stirling is excellent.
The main problem is in transferring the heat to the working substance. This takes time with the result that the max temperature is usually no more than 700C and the revs of the engine are limited. Hydrogen or helium improve this but introduce sealing problems. Unless this can be overcome the sterling engine will always be less efficient than an IC engine.
This is absolutely elegant. Should be straightforward to make a diagram for preferred phaseangle related to temperature and revs. Then some feedback from probes and - well You have written it Yourself.
The movement of the power piston is sensed by a shaft encoder which is fed to and analysed by the electronics. This then feeds the stepper motor with the correct number of pulses to keep the engine running at max performance
You are 100% correct you can adjust the phase while the engine is running. I have some very interesting data on the phase versus power out and revs. Using a microprocessor you can maximise the power under load.
Does the stepper motor take more power to run than the small sterling engine can produce? I can see this being very useful on larger sterling engines though.
RickMHobson 4 months ago
If i am not wrong, that Big stepper motor is a HP printer stepper motor, part number is PM55*****. Quite powerful for its size and produces significant power just using my hand to turn it.
Any schematics for this engine?
boharihamen 5 months ago
This is a really interesting idea. I wonder if you could also just have a solenoid drive the displacer, and have the activating switch be mechanically triggered by the piston position.
macrumpton 6 months ago
so r u feeding it power manually? or does it read from the encoder on the power piston to tell the stepper what to do?
kowdie12 9 months ago
*****
piespokladowy 1 year ago
so...... heat to electricity?
Cool
BlueDragon4484 1 year ago
Is it possible to vary the speed of the engine?
mikeg642000 1 year ago
Perhaps if you tried to change the movie format to AVI or something other than what you are using before uploading it might stop that noise problem.
macrumpton 1 year ago
Might want to reupload the video. The audio is buggered up on your clip.
sonyxploder 2 years ago 2
nice but there's no need of a stepper motor to change phase... differential gearing anyone?
cdallacosta 2 years ago
There is no use ta have this vid up with this bad sound. Remove it and upload it again. Nice engine though
ricande 2 years ago 4
So Is this like fuel injection to an ic engine? I like it! Does the engine produce it's own power to run it's own electronic?
Art
arturomoises64 2 years ago
That's a good way of looking at it. Several parameters are sensed which changes the phase between the power piston and displacer to produce maximum output power. Yes the engine does produce enough power to drive the electronics but at this stage I haven't bothered to add a generator to it.
LVKERR 2 years ago
nice song ... tectonik ?
olidz 2 years ago 6
fix that noise
boa721 2 years ago 4
Can't watch this 'cos of the noise!
trossachs2003 2 years ago 5
Just mute it lol...
sypha0x 2 years ago
LIKE A MARTINI STILING ENGINE ...
SWINGREGORY 3 years ago
This is awesome. I take it the stepper motor doesn't use up more power than the generator is capable of producing?
I'm interested in building a stirling genset for an electric car (turning it into a series hybrid) in the future. Though I need the EV first so it won't be for a while.
ThalassTKynn 3 years ago
The secret to keep the stepper motor consumption down to an acceptable level is to use a chopper drive such as the L298 driven by an L297 IC. This would be suitable for a larger capacity engine.
Good luck with your project.
Regards
Les Kerr
LVKERR 3 years ago
the sound is screwed make a new vid
30GB 3 years ago 2
The noise on the sound track is not on the original video. It happened in the upload process. Can't contact Youtube to re install. Any suggestions would be appreciated.
Les Kerr
LVKERR 3 years ago 2
remove the video and re-upload it
coolbluelights 2 years ago 6
Very well done, and a very clever idea!
Does the stepper motor ever skip a step, maybe at high speed?
Richard
electrique527 3 years ago
Initially I connected the stepper directly to the displacer and found that the motor stalled when its RPM exceeded the max revs of the stepper. This was solved by the 2 to 1 ratio gears that reduced the stepper speed to half. It now is stable and will run for hours. To make the stepper run at high revs I fed it with a constant current source driver.
Les Kerr
modelengineermedia 3 years ago
What do you think of this idea?...On a car,take apart the engine,hook this up to the crankshaft and connect an element(which is powered by the battery/alternator) to the heated part!
popupwool 3 years ago
The engines capacity is about 3 cc and it's output power is about 3.5W. Might work in a model car but definately not in a full size one.
regards
Les Kerr
LVKERR 3 years ago
I think free energy is impossible and Stirling engines would do well to avoid the idea altogether.
cyborgtroy 3 years ago
I think we all agree that free energy is impossible. Infact current Sterling engines would be lucky if they were 10% efficient. The aim is to improve them.
Les Kerr
LVKERR 3 years ago
Depends on how you mean by efficient. Currently Stirling engines are the most efficient at converting solar energy into power. Under the proper circumstances the Stirling is excellent.
moabsafari 3 years ago
The main problem is in transferring the heat to the working substance. This takes time with the result that the max temperature is usually no more than 700C and the revs of the engine are limited. Hydrogen or helium improve this but introduce sealing problems. Unless this can be overcome the sterling engine will always be less efficient than an IC engine.
LVKERR 3 years ago
AMC put a Stirling in one of their American Eagles. It managed to get 30% better fuel milage. It could run on either Gas, Diesel or Ethenol.
FearTurtles 3 years ago
i think that power transformers are more efficient they are 90 percent efficient
sciencenerd1616 2 years ago
Excellent! Thanks for posting.
kheston 3 years ago
Glad you enjoyed it and thanks for the encouragement.
regards
les kerr
modelengineermedia 3 years ago
Do you have a link? Also, it's spelled "St_I_rling".
desiredusername 3 years ago
Sorry don't have a link otherthan modelengineermedia
modelengineermedia 3 years ago
This is absolutely elegant. Should be straightforward to make a diagram for preferred phaseangle related to temperature and revs. Then some feedback from probes and - well You have written it Yourself.
Great job!
OleTC 3 years ago
Thanks for your encouragement. At this stage the electronics is only receiving data from the shaft encoder on the power piston
regards
les Kerr
modelengineermedia 3 years ago
Electronic ?
HFGFGBDBDB 3 years ago
The movement of the power piston is sensed by a shaft encoder which is fed to and analysed by the electronics. This then feeds the stepper motor with the correct number of pulses to keep the engine running at max performance
modelengineermedia 3 years ago
That's pretty cool, so it can adjust its delay while it's running?
So you could experimentally determine the most efficient phase at any speed, then use that. AWESOME.
cyborgtroy 3 years ago
You are 100% correct you can adjust the phase while the engine is running. I have some very interesting data on the phase versus power out and revs. Using a microprocessor you can maximise the power under load.
Les Kerr
LVKERR 3 years ago 2