Testing My Experimental Wind Turbine (VAWT)

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A video about my experimental wind turbine and the techniques I used to measure it's output. Video shows how to calculate expected output, and some of the basic equations used for doing this type of testing.

The VAWT is 2ft tall with a 16 inch diameter.

Science & Technology

Published on


Mar 7, 2009




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Comments 194
from windy southwestern NM do you sell the kits? am musician not engineer., Woukd love to have it here on my property to experiment this .. What would it cost?
Kenny Clement
Kenny Clement 18 days ago
From what ive seen . most pmas need a min. Of 600 rpm to produce at all! Buut most wind tubines turn 300 or less! Whats needed is 100rpm pma!
sjh7132 16 days ago
That's true, and it's not hard, but it is expensive because it requires lots of copper and big magnets.
Joseph DuPont
Joseph DuPont 19 days ago
Why not just put magnets on the bottom of the singing how to go over coils and lemonade all the all the drag of the chain and everything else or belts also the mass going around like that should make it more stable
Joseph DuPont
Joseph DuPont 18 days ago
So it was direct drive?
sjh7132 19 days ago
You must have used text to voice because some of your words seem wrong, but I didn't use a chain or belt.
Joseph DuPont
Joseph DuPont 19 days ago
Use some gripper primer by Glidden to hold down fiberglass screen over the whole thing and it'll make it a lot stronger but that's this is a great idea especially to be a quiet windmill I'm thinking about something to bring with me on my van that I can put up for a little extra power
Bipin Singh
Bipin Singh Month ago
Presentation is very casual - loud music, low voice, unprofessional accent. Overall useless.
sjh7132 Month ago
Maybe that's because I'm not a professional video maker. Look at the date on this video. This was made in the days when people on RUvid did it for fun, not a business. I would say the video isn't as useless as your comment.
da ne
da ne 2 months ago
im not electrician or engineer but I know I could improve this design concept . with a little musk !
sjh7132 2 months ago
I'm looking forward to watching your video.
Chris Williams
Chris Williams 2 months ago
Nahhhh.....I'll go watch shcool projects to see some more serious builds
Chris Williams
Chris Williams 2 months ago
+sjh7132 Yes, I just did that without giving a fuck about the antiguity of your video, it's crap and being critisized when exposing publicaly is something you should have learned after 10 years or more now... :-)
sjh7132 2 months ago
So you came to my 10 year old video to post a comment that says you prefer not to watch it?? Fine with me, but you have a lot of videos to comment on. :-)
Stephen Williams
Stephen Williams 2 months ago
You did good. Some power better than no power. Adjust size to harvest something.and be a winner. Moley magnets are best though costly. Keep it up. Good show.
pulesjet 5 months ago
Without any Information on your Alternator sorta hard to realize any useful information here.
sjh7132 5 months ago
Well, the alternator was just big enough to stop the turbine, so we know that it we were measuring all the power turbine had to give. Neither the turbine or the alt were all that good, and weren't worth copying.
Clark So
Clark So 5 months ago
A realistic analysis and approach, which makes this one of the best video.
Tim Brown
Tim Brown 2 months ago
+DIY Oregon You're going to need those meters to figure out your full output at some point.
DIY Oregon
DIY Oregon 2 months ago
Yes if you're an electrical engineer. I'm not and cant do this same testing at my house, lol.
Nicholas 6 months ago
I am curious, what would happen if you introduced gears with high ratios? I believe it would possibly modify the speed of the alternator
SVEN AWISZUS 7 months ago
Видео "Трансформатор TESLA": ruvid.net/group/PLlEX99xZE8qNc1MNp9EwjbeugLTRhr-9g
Frank Blackcrow
Frank Blackcrow 9 months ago
It's dancing around like a drunk sailor, that might be something that needs fixing.
OhioValleyBoy Planet Zoo
You ever tried to fix a drunk sailor...bet u havent..good luck with that! Lol
Shannan Schisler
Shannan Schisler 11 months ago
I made it by myself. I used Avasva solutions for that.
Luis González Aguilar
P=(E)*(I) O bien W = V * A
Julian Year ago
Nice Job !!!
scott d
scott d Year ago
Very nice
Myth-ter Moth
Myth-ter Moth Year ago
I think efficiency is way overvalued as a measure of wind turbine performance. (power produced / money spent) is the figure to be maximised. A cheap and gale-resistant design will beat an efficient one, its just a matter of scaling it up in size untill it produces the power output required.
sjh7132 Year ago
I agree, but you probably need to factor in the cost of keeping it running into the equation. Also if you live in a place where your neighbors don't want to see a turbine, more power from a smaller turbine is somewhat important.
This is really good video. I've seen other videos with other designs claiming 1kw of power
Roberto Bheatcoker
I always wondering which is the best type of generator for small scale wind turbines?..alternators...brushless motors...?
Perez Frank
Perez Frank Year ago
Great job
Todd Crenshaw
Todd Crenshaw Year ago
Finally, a home brew that actually shows power output. Too many videos of wind generators without the generator. Anyone can make something spin in the wind and then claim x output. It's nice to find the few like this one that actually have the generating portion connected, so output can be observed. The more I see and learn about small wind turbines the more I like photo voltaic. There are cloudy days but with enough panels and power storage these days are not an issue. Wind on a small scale seems like the ROI just isn't there. And being mechanical, there's a much higher chance of failure. I've had panels on my roof for over 10 years, through hail and even a nearby tornado. No issues. A turbine would be most likely destroyed itself in the tornado event. I'm not saying wind power generation is a bad thing. In certain circumstances it may be ideal. The more I see video's like this with real output, the more I turn to solar. I'll admit it would be fun to try and see just how efficient I could make a wind generator, but that's more of a hobby thing and just fun to do than serious energy generation. Thanks again for the excellent video and including the power output.
Ray B
Ray B Year ago
Most well done video on VAWT, I have found so far on RUvid.
RodebertX Year ago
K J Year ago
jrg10332 Year ago
Your turbine was moving in the wind man. Killing how much efficiency?
Vlad Klimovich
You can learn from inplix scripts how to make it yourself.
Proxy 2 years ago
aww, i thought they were Jellyfish Blades xD also meter is with a small "m" so is kilo with a small "k".
Rúnar Jóhannesson
Also came here for that!
David C
David C 2 years ago
Coming from a student testing wind turbines, this is a great video.
William Ulibarri
William Ulibarri 2 years ago
Make a jellyfish-bladed turbine.
mexcan fun
mexcan fun 2 years ago
Just breeze here , but I had a little sailboat, and it put out about 2 hp, so a windmill of for sails should be cheap and powerful, also an old gas moter would be good for berings and pump actions.
Juicystarboy 2 years ago
you don't measure voltage to see if it can hurt you. You can touch a 240V power supply if it has a low current. That's how Van de Graff generators work without killing anybody. A low change in voltage means low current, therefore, if you have 25 volts, in your case, and there is a high change in voltage, then it could seriously injure you.
Jordan Johnson
Jordan Johnson 2 years ago
Julian Rubinstein Search up Ohms Law.
Just Thomas
Just Thomas 2 years ago
While you are correct that 'voltage doesn't kill, amps do', I beleive he was implying that the electricity wouldn't complete the circuit to the ground because of his body being a reasonably high resistance.
Zachary Seddon
Zachary Seddon 2 years ago
Yeah, 25 volts probably wont hurt me. *ten seconds later* *gets struck with 10 amps at 25 volts* *Dies*
Hexane 2 years ago
Also consider that the human body has significant capacitance; If you have AC current, resistance can vary widely.
sjh7132 2 years ago
True, but it only takes a few ma to stop your heart, so I start to be careful at about 60v.
einstein9073 2 years ago
You'd need about 100,000V to push 0.1 A across 1,000,000 ohm. 25V is very much lower than that.
Neon Dragger
Neon Dragger 2 years ago
+Zachary Seddon 10 amps is 100 times the lethal amount. U really dead.
Zachary Seddon
Zachary Seddon 2 years ago
Ahh, I forgot about that. Good point
John Benton
John Benton 2 years ago
Is it not amazing that some companies invest loads of money into VAWT R&D and some 'erbert thinks he or she can perfect the same in their back garden? (Usually without a load!)
Jon Ripley
Jon Ripley 5 months ago
Generally, you're charging a battery system that powers a certain portion of your home, say, the lights.
Paul horneto
Paul horneto Year ago
They often do, silly yank.
Robin Poole
Robin Poole Year ago
Would make a good rv battery overnite charger. Maybe use a 27" bicycle wheel as simple mod to increase area with belt on rim driving alternator? Let your kids make kit to sell on eBay as experiment in capitalism?
Robin Poole
Robin Poole Year ago
Would make a good rv battery overnite charger. Maybe use a 27" bicycle wheel as simple mod to increase area with belt on rim driving alternator? Let your kids make kit to sell on eBay as experiment in capitalism?
Operator 801
Operator 801 2 years ago
Economy of scale is a powerful tool. If a huge company that serves 1,000,000 people can spend a billion dollars to make electricity $.01/kWh for me, then that's a significant and immediate savings for me. Conversely, I could find hundreds of ways to generate my own electricity at home. At best though, I'd likely be looking at decades of continuous and maintenance-free operation to earn back the time I'd spend designing, building, and implementing the system. People like to hate on large corporations, often for good reasons. But being able to do something yourself, that took a large and dedicated company years of work and billions of dollars is a VERY rare position to be in.
CHIMET El arte del fuego
I think the problem is not your turbine, is in your generator. hope you improved it
ExtantFrodo2 2 years ago
So how does one best match their turbine to their alternator (or vs versa)?
sjh7132 2 years ago
Ideally you'd measure the curves for the performance of the turbine, so you'd know power vs RPM for different wind speeds. Then you can design and alt if you know the strength and size of the magnets and the resistance of the copper that will match it. Getting the turbine measurements is the hard part. You are also safe, if you just over design the alt and make it bigger than it needs to be. It will be very efficient, but it will cost more because of the magnets and copper wire.
Jc Knight
Jc Knight 3 years ago
Question: Does your "swept area" calculations include the entire area of the rotor...or just the windward side producing power? Obviously the rotors going back into the wind would not only not be producing power, but would also be taking power via drag. I think that, and an unrealistic "swept area" calculation might explain your low efficiency numbers...
sjh7132 2 years ago
There are VAWTs that do what you say, with the wing adjusting as it goes around. See SB&K or SHARP vawt. In my case the wing is fixed. But since it's running faster than the speed of the wind, the angle of attack varies through a limited angle and the wing can generate lift most of the way around. The biggest problem is getting started since when the wing is moving slowly the angle of attack goes through all 360 degrees.
Jc Knight
Jc Knight 2 years ago
Sorry so late in reply. In order for the upwind sail to be generating net positive thrust on the axle, the blade would have to be constantly changing it's blade angle through it's upwind sweep. Just like a retreating Helicopter blade would have to increase it's pitch (via the swashplate) to maintain net lift on that side of the rotor. (I design airfoils and wings) Did i miss something in the mechanism that accounted for that? At some point the airfoil/angle of attack to the relative wind is going to generate thrust, but if the advancing airfoil can't constantly change it's angle of attack it's going to be creating a net drag on the design. The analogy of the sailboat works because the sailor constantly changes it's angle of attack depending on the position of the relative wind, and produces thrust approximately 45 degrees between the track of the boat and the sail position. How does this VAWT do that?
ExtantFrodo2 2 years ago
*"It's just like a sail boat sailing tacking and sailing up wind at an angle."* Really? It doesn't make sense to me.
sjh7132 3 years ago
+Jc Knight At first that seems obvious, but it's wrong. The blade coming up wind actually does generate power. It's just like a sail boat sailing tacking and sailing up wind at an angle. The only place the blade doesn't generate power is when it's almost straight up wind and down wind. The swept area is the entire area of the rotor.
lego getriebe
lego getriebe 3 years ago
great work, keep up researching! I need to draw charts like you showed on the video for my projects, what program did you use to draw them?
lego getriebe
lego getriebe 3 years ago
+sjh7132​ OK, thanks! I tried with I think Microsoft exel and it didn't work for me :(
sjh7132 3 years ago
+lego getriebe I think it was OpenOffice Calc (a spread sheet program. like Excel)
whisperingsage 3 years ago
How do you wire the axel to te alternator?
sjh7132 2 years ago
There are only magnets on the spinning part of the turbine. All the wiring (coils) are stationary. The wires just come out the side.
James Waid
James Waid 3 years ago
Impressively thorough. Thank you.
anibal zuñiga
anibal zuñiga 3 years ago
alguien sabe que hara con las resistencis de loza en serie????????????????????????????????????????????
MrPSCHEUR 3 years ago
Many thanks. What that determines the rotation direction?
sjh7132 3 years ago
+MrPSCHEUR It rotates equally well in both directions and it's kind of a random thing. Since the output is AC it doesn't make any difference electrically.
Jose Barra
Jose Barra 3 years ago
con las resistencias hara usted un divisor de voltaje¿¿¿¿¿¿¿¿ perdon no hablo ingles, es una idea que yo querria usar, puede explicar para traducir.......gracias
Jose Barra
Jose Barra 2 years ago
thanks for your reply Could you explain .... in English ... I translated Use of resistors to measure Voltage or amperage? I want to do the same as you
Jordan Johnson
Jordan Johnson 2 years ago
No hablo español bien, muchos sientos. Aprendo español en mi escuela. Los resistentes se utilizan para probar la energía eléctrica.
juzzlookin 3 years ago
The best video and explanation I've seen on here yet. Real Calculations for a real generator, and a good conclusion. Well done sir.
muddymuddymuddmann 3 years ago
excellent video, and explanations. 20 stars. MUDDy
Mat Hunt
Mat Hunt 3 years ago
Have you thought of redoing your evolution design with the proper viscosity and try that out?
asdalow Year ago
Do it with the help of your kids.
Evan Bialo
Evan Bialo Year ago
Post the code somewhere,so someone else can fix it
Mateusz Dowgiert
Mateusz Dowgiert 2 years ago
Just found this channel, this would be extremely interesting .
sjh7132 2 years ago
Yes, I have thought of it. But the computer systems I used for this are gone. All the software versions have changed, etc. It would be a lot of work to get this running again. I have other things in my life that are taking my time. (House maintenance, kids, etc.)
Abay Bektursun
Abay Bektursun 2 years ago
Author, please address this question
Helveteshit 4 years ago
+sjh7132 You should take the knowledge from big wind turbines that use magnets to 'break' the speed down. It is not about how fast it spins to generate electricity after all. But breaking the RPM down a notch using Electrical magnets, you can potentially produce more Watts since it produces more workload/Ampere for ya. Hard to explain since I am not English Primary language but I learned most of this stuff back in school when I studied to become electrician.
Helveteshit 3 years ago
+Jose Barra Sorry, I am Swedish, not Spanish/Portuguese.
Jose Barra
Jose Barra 3 years ago
+Helveteshit vi su comentaro y estoy interesado en el tema, me intereso su planteamiento, su primera lengua sera español¿¿¿¿¿¿
Carlos Leme
Carlos Leme 4 years ago
Muito bom seu trabalho,preciso fazer esse calculo para o meu gerador de ventilador de teto.
Carlos Leme
Carlos Leme 3 years ago
+muddymuddymuddmann Obrigado
muddymuddymuddmann 3 years ago
+Carlos Leme Você pode obter uma eficiência menor sobre a turbina de vento do ventilador de teto. Ele ele, deixe-me saber o que encontrar Carlos. MUDDy
HM Dickson
HM Dickson 4 years ago
Loose the calculator. Your too involved in the math of the thing. Convert that alternator to a DC motor which will make power at lower speeds. Then hook it to a load and you get what you get. If you need twice as much power, build another one :) An alternator is usless if you don't have a long cable run which causes a lot of loss. Even if you do it is easier to convert to pulse DC and upconvert through a microwave transformer, send it the distance with tiny wire then downconvert through another transformer and change back to smoothe dc at the batteries, or just use the pluse. Less loss than an alternator because it will charge at speeds that the alternator will not make power.
Unity101 3 years ago
+HM Dickson I have a 24V Three-Phase wind turbine and these things are great. I originally had a 24v DC Wind Turbine that I replaced with my AC one due to the fact that if you had a big load, or any load of that sort, it would almost stop the turbine and thus require a hell of a lot more wind to compensate, whereas my AC turbine can keep spinning and not stop at all since it's not continuously drawing current all at once - it's alternating. This means that the turbine requires less effort for the blades to be spun.
sjh7132 4 years ago
+HM Dickson To convert the high voltage back to battery voltage I'd use a switching circuit, like a buck regulator. Transformers don't work very well in applications where the frequency changes over such a wide range. Plus when the turbine is first starting it puts out such low frequency that the transformers will appear like shorts and prevent the turbine from starting.
HM Dickson
HM Dickson 4 years ago
+sjh7132 Yes you could. But will that make power at lower wind speeds? You would also have to wind the second transformer anyway to convert back to 12 or 24 volts at your batteries.
sjh7132 4 years ago
I could also just wind for a higher voltage.
Jeff Kephart
Jeff Kephart 4 years ago
Nice job, sound engineering, well explained. I knew the electrical part being a ham as well as eletronics geek and rider of 450w ebike but didn't know the aronautical parts. I'm a big fan of VAWT esp low speed / high torque ones. I loved your comment going in about all these spinny things on youtube and the like and "do they make any power?". As a friend said about Sterling engines, ever see one doing any work? Or just spinning? I think an odd number of vanes is a plus and larger radius would slow it down but increase torque and you might be able to vary that to better match the generator. Still 5w from somthing that looks like $20 worth of parts and a PM motor is a lot more cost effective than a 5w solar panel from Harbor Freight! For very small energy production needs like to float charge / maintain a deep cycle, 5w is not that bad. Adding 5-25w of solar to make up for daytime and no wind would be nice and the wind turbine probablly spins at night. As an off-grid guy I met who runs wind and PV said, when it's sunny it may not be windy but when it's not sunny there's usually wind! 73 all de n3glv
Donna cain
Donna cain 4 years ago
put a wing shape half way around the wind turbine .....
voodoolol1 5 years ago
How did you build the generator?? it looks like a very stable design!
RPdigital 5 years ago
For this design I would build 4-blade, not 3-blade turbine. And I would secure it from 2 points of axle, for not losing energy caused by vibration and gyroscopic friction braking. And never expect to get 100% of wind impact energy out of your turbine. I would expect 500 W medium wind to turn 350 W generator (70%) and it should work at lower wind speeds also. The air density for average temperature where I live is about +5 C, so air density is for this temperature about 1,27 and for +10 C 1,25. 5/4 is pretty good to simplify calculations.
Billy Baulbuster
Billy Baulbuster 5 years ago
Holy shit. I just wanna build a windmill.
jimmyhackers 5 years ago
oh and get a solid post int he ground
jimmyhackers 5 years ago
easiey fix if you want more power just extend the wings. make it longer
imad omda
imad omda 5 years ago
Hello your turbine is not very stable and this makes you loos a lot of energy thx
Dart Gar
Dart Gar 5 years ago
I finally found a real Engineer on the net. Good experiment thanks for including the formulas.
sjh7132 5 years ago
Once they start moving and you add the vector of the wind with the vector of the apparent wind from the movement, there is a non-zero angle of attack.
mehmet çiçek
mehmet çiçek 5 years ago
@0:15 how does it have power when blades r symmetric and haven't angle attack and not airfoil. please explain. and thanks for video and all reply. congratulations!
sjh7132 6 years ago
No, area for a VAWT is the area seen from the side, so it's diameter x height.
shylildude 6 years ago
@1:32 did you use Area=circumfrence*height?
sjh7132 6 years ago
Thanks, I'm an Electrical Engineer. I never considered pharmacist. :-)
zman4us 6 years ago
You are objective, with super math skills, you could have been a pharmacist, maybe you are. Keep doing good things, thank you, Gene the zman
CMM laser - steel solutions
I like it, very interesting !!
Charles Alford Jr.
Charles Alford Jr. 7 years ago
Genius man, thank you very much for your detailed description of your experiment. Thank you!
sjh7132 7 years ago
@Windroseism dims are on one of the first comments above. It did self start by rocking back and forth until it took off. The airfoil is a simple ellipse.
pro gaming 2251
pro gaming 2251 7 years ago
you know what?i dont comment most videos but this one you made explains very well to even retards.i know calculation electronic and stuff but the way you show it is a sample for anyone who wants to put video on youtube!!very well mr.!!vey well
sjh7132 7 years ago
@Mrinfoone The wings are simple ellipses 9" x 1/2" x 24" and they are mounted 8" from the center at an angle of 0 degrees measured at the center of the wing.
Mrinfoone 7 years ago
can you send me the dimensions diagram off the wings and or diagrams? so i could build one thanks
elwood173 7 years ago
Thank you. One of the best turbine videos I have been able to find. Good info.
sjh7132 7 years ago
@215alessio That's true if the the turbine has the power to push the alt to that point. In my case the turbine was too weak so the peak power point would be more determined by the characteristics of the turbine and not the alt.
Alessio S
Alessio S 7 years ago
the best output power is when the amps equal the voltage forming a perfect square in the voltafe amps graphic respecting the max output amperage of your coils ofcourse
sjh7132 8 years ago
@walkertongdee In this video the wing is just an ellipse (squashed circle) and it's mounted with a mount angle of 0 degrees. (aoa generally is relative to the wind, which changes depending on where the wing is in it's rotation.) In other videos I use air foils. Many people build their turbines so they can adjust the angle, I never have.
Walkertongdee 8 years ago
I waw wondering if the wings are an airfoil shape like an airplane wing, I cant really see them and if so how did you choose the angle of attack? Would it be a good idea to be able to rotate the wings to set the attack angle? Please respond..
purplemutantas 8 years ago
@craftmatic2 Solar is good. But solar only works during the day. It's also not ideal in places where you get less sun. A combination of wind and solar would be better. Where I live it's frequently cloudy. So I am looking into wind generators to go along with solar.
sjh7132 8 years ago
@craftmatic2 Or just a plain old solar panel. I have 1000 watts of those running already. I'm just exploring other options.
sjh7132 8 years ago
@ed4ed Those are high tension electric wires with the sun glinting off of them. Sheesh, I don't live on a rocket test range or anything like that.
ed4ed 8 years ago
AT 00:41 LOOK at the Damn CHEMTRAILS in the Background! AHHHHHHHHHHHHHH!!!!!!!!!!!!!!!
sjh7132 8 years ago
@wordpresswidget Yes I rounded. I think at the time i was estimating in my head and approximated 6.7 as 7. Yes, breaking Betz is impossible, that's what I'm saying. If I take the measured power of some lenz2 turbines and use the formula for area that you pointed me to, it would sometimes break Betz. If i use the full area (d * h) Its about 40% efficient.
sjh7132 8 years ago
@wordpresswidget The poster claiming the 2/3rds factor has made many assumptions. The fact that he made one or two VAWTs and used a little calc doesn't make him an expert. There are many other experts that disagree. In fact we've seen VAWTs that would be breaking Betz if you applied that 2/3rds factor to the area.
sjh7132 8 years ago
@TheTwistedGypsy i think you are mistaking the sun's reflection off of some high tension electric wires for chem trails.
sjh7132 8 years ago
@ak471966 thanks, if you are really interested there is a good discussion group at the vawts dot net site.
sjh7132 8 years ago
@danie1murphy Thanks. Yes it seems that many people don't realize that power and speed are two different things.
da ne
da ne 2 months ago
Daniel Murphy
Daniel Murphy 8 years ago
Thanks, someone who actually tests their turbine. So many youtube videos say "of course it's efficient, it just goes like crazy."
sjh7132 8 years ago
@ldelossant Those blades I hot wire cut by putting current through a wire to heat it up and pulling it through the foam. Later I built a machine to do it. (It's shown in one of my later videos). You might want to consider doing a HAWT because you can just cut those blades from PVC pipe. (in my next video) Also you might want to check out the vawts dot net site.
Jose Luis DeloSantos
Hi, I am a High School Math teacher in New York City. Would it be possilbe to see a video of how you built the turbine's blades. I have several projects including building a wind turbine in class by dfferent groups of students ( one group will build the stator, the other he turbine and another will do the calculations ) Your viedo is very instructive. Would you please made a viedo on how to shape and build the blades? Thanks.
Rose Suen
Rose Suen 8 years ago
Thanks! i want to try to make one myself now :D very inspiring
Pablo Saavedra
Pablo Saavedra 8 years ago
You are the ONLY person I ve found doing systematic experiments on your ideas and coming up with results that are meaningful and to a degree, accurate. I hope to see more of these backyard inventors following suit. I love your work. I'll post some of my work as soon as i get a camera. You've inspired me.
sjh7132 8 years ago
@HeavyDemir It's Height * Diameter
HeavyDemir 8 years ago
Umm the sweep area u talk of? Is it the hight * breadth of the blades, or the circle they scribe on the ground ?
sjh7132 8 years ago
@kaloresi333 That equipment pays my bills because it's for my day job. :-)
Bardhyl Mbreti
Bardhyl Mbreti 8 years ago
Where did you find the money for all that equipment.If I had that i finished my project.good luck dude
sjh7132 8 years ago
@Zypkin You are correct. That alt will never produce any serious power. It was my first try, and I didn't run through the equations before I made it. Still is has been good enough to test all my small turbines so far. (I haven't had one that could overpower it.)
Andrea Bronzini
Andrea Bronzini 8 years ago
@sjh7132 ...46ohm looks to me a huge number for a device supposed to make power (let's be clear, it's not Urs only... it's a common range for coreless axial flux machines I saw around). As a matter of fact commercial generators have internal impedance less than 1ohm... and that's because you have to get the power out of the machine and not waste it in heat :) Anyway, I'm just tyring to help... I'm working on a ferromagnetic core axial machine, I hope I'll post my results within the summer.
Andrea Bronzini
Andrea Bronzini 8 years ago
@sjh7132 ...right... but this wouldnt work because would also increase the thickness of the coil which, being coreless, would lose most of the magnetic field :)
sjh7132 8 years ago
@Zypkin Or use more copper in terms of thicker wire.
sjh7132 8 years ago
@Zypkin I'll admit the alternator is poor, but it was enough to bring the turbine to a crawl. I was only using one phase to test which was 46 ohms. Had the alt been the real problem, the turbine would have continued at nearly full speed. I was hoping to have to use all 3 phases to load the turbine, but it was so weak it wasn't necessary.
Andrea Bronzini
Andrea Bronzini 8 years ago
@Zypkin ...a good generator should blow the coils if you short it... meaning its own impedance shall be so low to generate lot of current. To get a low impedance you need to use less copper (less turns in your coils) but since you shall keep the voltage high you must definitely reduce the air-gap stator/rotor and improve the overall design of the generator :)))
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