| T O P I C R E V I E W |
| Sundowner |
Posted - 28/02/2008 : 22:12:30
Where do I start.....
Ok I'm new to this forum as a member. I just signed up last week. I've been reading things for a while and appreciate all the information and advice I get for free.
Now I have a real question or two, I posted already on an existing thread but I really need advice so I'm opening this one.
Please give me some idea as to what I should ask a stepper motor company for.
I've contacted a company and they're prepared to supply and modify if needed brushless PMDC motors if I can tell them the tech specs I need.
They've sent me out litrature but to be honest all the technical stuff is just that ....technical stuff....grrr why can't they print in english.
If any member can give me basic info as to what an ideal motor should be I'd appreciate it.
I have also found a company in America that supplies new hub dynamos for $30 plus shipping (which is a lot cheaper than the untested sturmeys that come up on e-auctionsitewithaloadingdockname) I think a lot of people may be inspired to build a small turbie with prices like that for the motor.
I dunno If I'l allowed post the link but if people want it just ask and I'll stick it on here.
Eagerly awaiting responses...
Sundowner
Sundowner....huh.........thats what they call us.......Sundowners |
| 15 L A T E S T R E P L I E S (Newest First) |
| BushWhacker |
Posted - 07/03/2008 : 04:18:00
I don't recall who, but someone on this board has had reasonable results using a drum VAWT and bicycle sprockets and chain to gear up. The 1500 RPM bit still scares me though. That's pretty darn busy.
I wish you luck!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
| Sundowner |
Posted - 06/03/2008 : 07:16:47
Thanks BushWhacker, it is as I suspected from all the reading I've done on here.
This little motor would have to spin too fast to be productive. I could always look at using gears but I think that would get complicated.
I think I hear a drawing board calling me.
Sundowner....huh.........thats what they call us.......Sundowners |
| BushWhacker |
Posted - 06/03/2008 : 05:50:41
Sundowner;
What I come up with (rounded off) is 2750/24=114.6 rpm per volt X 13=1490 rpm before you get any usable charge based on a 12 volt system. Of that I feel quite confident. I'm guessing you would see just over 60 watts at that speed.
If you are cranking near 1500 RPM and do not have an affiliation with NASA, their machine shop, and composite materials manufacturing division, I really don't think I would like to be around that turbine while it is making usable power. I hate the thought of blade bits going through my body.
With respect, there are far better gen units available. The key to selection on a DC unit is RPM/voltage X 13=? if you are looking to charge a 12 volt system. The lower the RPM needed to generate 13 volts the better. If you are using a HAWT 300 or less rpm is a good target. If you are using a VAWT 120 RPM will do but under 100 RPM is the good stuff.
Don't worry, we were all there at one time not knowing what to look for. It's a learning curve and I doubt anyone knows it all. I certainly don't and will never pretend to.
Good luck in your quest for cheap power,
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
| MattM |
Posted - 06/03/2008 : 02:06:29
It's only been a few days since you asked. At the least you can hook up to a power drill and get a reading off of them.
Go Huskers! |
| Sundowner |
Posted - 05/03/2008 : 23:06:15
I'm guessing that thsese motors must be useless ?
Sundowner....huh.........thats what they call us.......Sundowners |
| Sundowner |
Posted - 01/03/2008 : 21:26:04
:O:O:O sorry Ghurd, I was sure that was an American site musta been the .com got me confused.
Thanks Donnydingle, I'm kind of leaning the same way myself now, buy a small turbine and use that to learn what I can and can't do.If I burn it out its only cost me a few hundred euro.
It would also have another plus in that it would help me gauge the possible power I'd be able to generate.
I cn't wait to get something up and running, just so I can show the beautiful location I have.:)
Has anyone tried to make a turbine from a scooter motor. 24v 2750rpm 120w is what it says on the tag.
Its a nice solid little motor and I have 5 of them if anyone is interested in helping me design something around that motor I'll gladly put one in the post(if its practical no point in wasting time if its only going to crank out minimal V and A).
Sundowner....huh.........thats what they call us.......Sundowners |
| donniedingle |
Posted - 01/03/2008 : 14:50:17
hi sundowner
you say your gonna put a mobile home on your plot and then use renewables for the electric supply ....great. i'm totally dependent off grid myself, its a case of putting your hand in your wallet and getting a chinese 200W turbine, they are brilliant i have 2 at my remote farms. once you get one up and running and experiencing first hand your demands on power useage, then go for a bigger unit or an extra unit, cheeezzz what can ya get for 200.00 these days, i bought a futurenergy unit, i must need my head looking at.....bearings the size of skate board wheels. and from what i saw inside it someone is making a healthy profit from them, yes not my cup of tea for up here in the windy north. now my chinese ones another story .
regards donnie.
just keep her spinning.. |
| ghurd |
Posted - 01/03/2008 : 03:58:34
That hub dynamo for sale on an American site... is in Singapore. LOL. |
| ghurd |
Posted - 01/03/2008 : 03:06:16
Thanks for the link.
Steppers. It's been quite a while.
I wanted 1.5A at 12V. Low inductance, low step count per rev, etc. 144 pieces?
Price came in at $650 / £325 each. $100,000 for a case of stepper motors? No Thanks!
I never did find those socks.
G- |
| Sundowner |
Posted - 29/02/2008 : 21:56:55
I have to agree with you on that Tim, I couldn't see a size specification on any of the blades for sale either.
I did find the forum so it appears that I'll be doing a lot of lurking there too :)
Sundowner....huh.........thats what they call us.......Sundowners |
| Tim L |
Posted - 29/02/2008 : 19:59:17
Thanks Sundowner, I looked at the 1000W blades on the Navitron site, but may have missed basic info.....like how big they are, for a start! |
| Sundowner |
Posted - 29/02/2008 : 19:07:51
Hi Tim L
Thanks for your advice, its appreciated.
Cheap source for blades.... this is a link Ben posted earlier, I haven't seen turbines or blades cheaper anywhere else.
http://www.navitron.org.uk/e107_plugins/wrap/wrap.php?11
Is it acceptable for me to put up a data sheet from a motor company and ask members which one would be the best to use ?
Sundowner....huh.........thats what they call us.......Sundowners |
| Sundowner |
Posted - 29/02/2008 : 19:03:15
Hi Ghurd,
Lol at the knock my socks off comment with regards to price..thats my problem I don't know what to ask for so I can't get them to quote.
If I could throw some basic specs at them.. ....I might have a chance.
The hub dynamo I saw for sale, I don't think its an American design, just for sale on an American site.
I'll post the link and if the moderators/Ben wants to remove the link I won't be offended.
http://www.speedmatrixdepot.com/catalog/index.php?main_page=product_info&cPath=2&products_id=46
I think I need to use tinyurl on that lol.
Sundowner....huh.........thats what they call us.......Sundowners |
| Tim L |
Posted - 29/02/2008 : 16:55:57
Sundowner
From what little I know I'd seriously echo the advice to get a "proper" made-for-wind alternator like the Futurenergy one, rather than mess about with anything else. Even though it's a brushless design, the stepper motor I'm using as an alternator needs quite a bit of grunt to get it moving, and the proper ones will have been designed to minimise that so they can make use of lighter winds instead of needing a serious breeze to start going round. And that's only for one kilowatt, too. You could have a Rolls Royce design for the rest of the system but if the alternator is poor, there's naff all point.
By the way, I seriously underestimated the forces on my tower when the wind blows, so make sure your own tower is very, very well braced.
PS: Source for blades? Tell me more......... |
| ghurd |
Posted - 29/02/2008 : 15:31:16
Oh, I wanted to ask where you found a US hub dynamo.
G- |
