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mikeey01nzl
Starting Member
New Zealand
5 Posts |
Posted - 24/09/2007 : 02:01:45
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BW, thanks for the heads up dude, onto it :)
Ben you should put a flag on your web site... saying..
"Warning this is very addictive" |
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windymiller
New Member
United Kingdom
60 Posts |
Posted - 24/09/2007 : 10:48:50
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Hi everybody
Just an update on the motor....It just seems so strange that the stator is skewed when this motor was manufactured...The whole idea of skewing the motor in the first place is to eliminate the cogging effect as much as possible(nearly 100 % using skewing method ).
It is by all accounts an expensive option during manufacturing....so if this is the case you would think they would finish the motor with zero cogging ,but it is nt ?.
Im sure the parts on this motor are a mix match of several components which do work together once assembled ,but not as good as the correct components were designed to do.ie...zero cogging.
I do think the remaining cogging can be sorted by shortening the magnet length,this will make a quick fix solution to what would be a difficult problem.
The reason for thinking of this mod is simply to do with the way the iron teeth on the skewed stator "step" over the magnets (outside the stator,which run parallel to one another),from one field to another.
Given that the stator is already skewed ,it is necessary to position the magnets so that they are stepping over the iron teeth at just the right moment.Shortening the magnets determins how much they are" stepping" over ,one tooth to another.
If this done correctly :ie shortening the length of the magnets in some way,ive a feeling the cogging will be totally eliminated....i need to calculate how much to shorten them..and by what method!.Im not sure yet.
I know by reducing magnet size will probably reduce overall performance of the motor...but dont forget ,it was capable of 1000 watts to begin with..... reduced to 800watts is still excellent...probably more usable for my projects.
ps bushwhacker ,your project looks really good and really well made...bet you cant wait to try it out!.
Hi fungus...not sure how i will mount the motor just yet...if i cant reduce the vibration/cogging issue ,then ill probably isolate all vibration by a rubber mounting method.
Your idea of using aluminium may cause problems in the long term exposed in harsh weather, when fastened to steel components
Two dis similar meatals together causes a reaction (corrosion)so it can be a problem unfortunately so do be carefull..we mustnt forget this motor weighs 9 kg so we've both got to be carefull.
Oh ben...go easy on the lemsips ...i think i might need some soon...snif!!! you ve got my simpathy
Cheers windymiller |
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gotwind
Forum Admin
United Kingdom
765 Posts |
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windymiller
New Member
United Kingdom
60 Posts |
Posted - 24/09/2007 : 12:42:14
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Hi ben .
Looks like your thoughts could be right.
Like all things ,it was fundamentally a good motor which they sourced.(1000 watts ,very little cogging )
The drawback was it had vibration issues when rotating at certain speed ,which made it very noisey !!.hence probably why they went for a mk 2 version !!!!...lot quieter...
I did a bit of reading on skewing and yes your right,you can skew magnets in relation to the stator,But i think skewing them together isnt normally used (i dont think )
Yes i have seen people using grinders to chop the neo magnets ,but i simply dont think it would be easy to remove the magnets from the housing to do this....they re really bonded in securely.
The only solution i can see is to " turn" the magnets down to length ,with the neo magnets still in housing. (machine shop job )
Magnets are virtually sholder to sholder ( 16 in total )so shouldnt move,i dont think !!.
Im leaving it for now and trying the motor the way it is...if it becomes too much irritation then i will modify it....ps I see what you mean about numbers sold and number available...doesnt add up...only they know that answer!!!
cheers windymiller.
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Edited by - windymiller on 25/09/2007 10:07:01 |
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gotwind
Forum Admin
United Kingdom
765 Posts |
Posted - 24/09/2007 : 16:12:37
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From the horses mouth - I emailed the guy at renewablecomponents:
Hi Ben, These use the same casings, but different materials have been used which makes them a lot harder to turn by hand, but ok for motors. They would struggle to start a wind turbine. regards, gordon.
Nothing conclusive, just have to play around with them a bit.
The Futures Green - Getwind of it. |
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windymiller
New Member
United Kingdom
60 Posts |
Posted - 24/09/2007 : 18:22:11
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Thanks...where there s a will there s a way ...or is it a relative !!!
Ill keep you all updated if i modify anything.
ps your lucky ...i emailed and got no reply
cheers windymiller. |
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fungus
Junior Member
251 Posts |
Posted - 24/09/2007 : 19:19:44
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Theres a couple of pictures of mine here; http://www.anotherpower.com/gallery/fungus?page=23
Starting to think of a mount for it; I 'aquired' a steel block with a 1" hole in it from school ;-) so will weld on some legs and drill a hole for a bolt and see what I can do.. Thinking of a VAWT for this one..
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Edited by - fungus on 24/09/2007 19:26:31 |
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gotwind
Forum Admin
United Kingdom
765 Posts |
Posted - 24/09/2007 : 19:31:44
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Oh yes, I remember seeing the pictures now Fungus.
Looks like a really well built unit - radial flux steel core - Tiny air gap...
Your probably wise to go for a vawt design - particularly with the weight of the motor/generator - You might need to be looking at a 60 Gallon? oil drum halved to get the torque and good wind - not sure.
The Futures Green - Getwind of it. |
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BushWhacker
Junior Member
Canada
255 Posts |
Posted - 25/09/2007 : 03:59:56
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Hey Windymiller,
Turbines up and the wind is down. You could light a paper matches and have them burn down until they burned your fingertips all afternoon and evening here. It's 8:45 PM and still not a breath of air! Isn't that the rule?
Anyhow her she stands, please take note of the grid I'm supplying in the background.
;) just kidding of course.
Now I sit and pray for some wind...
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
Edited by - BushWhacker on 25/09/2007 08:54:31 |
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windymiller
New Member
United Kingdom
60 Posts |
Posted - 25/09/2007 : 10:25:11
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Hi bushwhacker...looks really good...im inspired...10/10
Hope hub motor performs well.
Let me know.
Cheers windymiller. |
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BushWhacker
Junior Member
Canada
255 Posts |
Posted - 02/10/2007 : 00:31:59
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Mr. Windymiller,
Just got her back up. It seems the cogging is the problem and the tubine has to "take a run at it". I had the hub apart and there are 10 magnets set as square, as square can be. I counted 20 coils that were off set inside to outside, but not skewed.
What I did was take a piece of light rubber hose (it's the insulation off of 10/3 severe duty extension cord) about 5" long and have it clamped to the output shaft of the turbine, with the other end clamped to the input shaft for the hub. You can see the turbine trying to turn the hub and winding up the hose about 1/3 to 1/2 revolution before the hub starts turning when there is enough wind. Roughly the same wind didn't budge the hub with solid drive. The drive was in line as you could spin a nut from one shaft to the other and jam nuts were a must. At least I get to see her spin a bit now.
I'm going to build another turbine with two sets of three aluminum buckets and a bit taller to see how that fares. The aluminum is light gauge so there will be less mass to get moving. I hope the extra thrust from the wind is sufficient for the "bump start".
ARRRGGG!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
Edited by - BushWhacker on 02/10/2007 00:50:38 |
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green energy
Starting Member
United Kingdom
14 Posts |
 Posted - 14/11/2007 : 15:02:26
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quote:
Originally posted by fungus
yes, they are very powerful and I couldnt get it out after half an hour of prying, wedging it out :) but theres not much reason to take it apart. Look at the pics I showed, theres not much to be modified except maybe a rewind if you're ambitious.
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green energy
Starting Member
United Kingdom
14 Posts |
Posted - 14/11/2007 : 15:04:24
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quote:
Originally posted by fungus
yes, they are very powerful and I couldnt get it out after half an hour of prying, wedging it out :) but theres not much reason to take it apart. Look at the pics I showed, theres not much to be modified except maybe a rewind if you're ambitious.
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green energy
Starting Member
United Kingdom
14 Posts |
Posted - 14/11/2007 : 15:10:08
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| can anyone help me understand what the differences between renewablecomponents RC2000-20 PMG and the stepper motor RC2200-20 they are selling, they are keeping the info very close to their chests, and are not being helpful with tecnical specifications. |
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fungus
Junior Member
251 Posts |
Posted - 15/11/2007 : 20:59:34
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green energy;
as I understand it the PMG spins much more freely and is more suitable for use as a wind generator - thats what they told me... |
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Interesting new source of possible wind generators
