bryan1

Hiya Klaus,
Eh mate that design ya doing sound interesting, do you mind putting up a few pic's of the alternator as it will be good veiwing. When you say your only going to have a 1 metre diameter prop that sounds way too small for a wind genny. I have a spreadsheet that tells you the T.S.R. (tip speed ratio) for a given blade diameter and expected wind speed, the ideal tsr is around 5 to 7 off memory, if you like I can send the spreadsheet to you so you can try out a few different combinations. Also have you ever checked out the otherpower forum as some of the blokes on there are wind genny guru's and don't mind answering questions thrown up on there. As far as not bothering about 3 phase star or delta configaration have a good read up on that forum and I reckon you'll soon change your mind. Off what you describe with your project, setup correctly I'd be surprised if you didn't get 750 watts atleast. Also I found a contact in Oz for 30x40x10 neo magnets and Hugh Piggot's book for around $200 and thats with 24 magnets. Anyway if I can helpout in any way Klaus I'd be happy to.

Cheers Bryan

__________________
" The only way to avoid human error is to avoid the use of humans"

Klaus

Gday Bryan,
The 1m diameter is more practical on a boat where I plan to use that thing if I ever get it finished. I have read most of the wind power sites on the net, 200W would be all to be had from such a small prop. I will delve into that tip speed thing when the alternator is up and running, plan to test it on my lathe first to see where the best output falls with regard to RPM. The prop will then be tackled, no point making it first when I do not yet know the performance curve.
The magnets I'm using are quite small to keep the lot compact, again lessening the output and hence the 3 rotor idea to get all it inside a 120mm diameter.
I am an electrician but presently an electronic technician so the have or have not 3 phase question is a familiar subject.

I did take some pics as I go along with the building process, presently have them up to casting the coils into epoxy. Send me a private e-mail to: norbert3008@msn.com with something obvious, like windpower,etc. in the subject line and I'll pass the pics on to you.
Klaus

williB

well i got two coils done tonight ..
the coil in the first pic is made of 17 Gage enaml coated wire, 1.5" dia. by 1/2" thick with a 1/2" hole..

the second pic is my fixture with the second coil just finished and still curing.. 8)
anyone recogneze the " fixture " is really a gas line tube bending device :lol: which i bought a while back at pep boys..that glossy finish is polyester resin..
on previous coils before tonight, i would just start wrapping the wire around the center with the starting wire dangling out , But this 0.045" wire would get in the way , and cause the wire to bulge out around the protruding wire..anyway tonight i filed a slot for the wire in the center sleve , and wrapped the pigtail end around the bolt, then after i poped out the center sleave i unwound the wire ..
thats the only way to get a good winding , imho

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bryan1

Hiya Willi,
Eh mate in all the wind genny coils I've seen they all have been sorta pear shaped but there's nothing to say a round coil wouldn't work as good. I suppose since your using round magnets it should be ok. I'm in the process of designing up a coil winding jig but I'm waiting on the 1/8" cube neo magnets I bought turning up. These magnets will be used with a hall effect sensor and I'll program some of my older pic chips to decode the pulses and output it to a few 7 segment displays.
Anyway with the ****** rain we've had over the last day and expect tommorow I'll have to wait to finish doing the anchors so I can finally get my wind genny flying and I'm waiting to see the best price I can get for 25 2"x1"x1/2" neo's so I can get going on my honda disk brake genny :twisted: Well they do reckon Honda's go faster :twisted: :twisted:

Cheers Bryan

__________________
" The only way to avoid human error is to avoid the use of humans"

williB

Exactly .. The coil should take the shape of the magnet , within reason..
the rectangular magnets have pear shaped coils . ideally the inner part of of the rectangular magnet should/would be tapered down..
I got 2.8A from the genny today , after i swapped the two smaller dia wire coils with the two new 17 Gage coils ..what i did was connected the genny to a full wave bridge Rectifier then connected that to a DC Ammeter..two more ta go and all will be 17 gage wire :lol:
I also took more pics and a movie but hav'nt put them into the puter yet..

williB

If anybody is wondering , where can i get some wire like that for free, these coils of wire came out of Relays..
i have , getting the wire out , down to a science , the guy i get these from tells me that he just throws them out , so he gave me a bunch..
He owns a generator/ alternator repair shop..
pic two is the fixture , without the wire , that brass sleve in the center worked beautifully..
pic three is a recently finished coil with the pigtail still woundup, and the sleve on the right..
Well i've finished eight of the thicker wire coils , YAY ..and i'll be testing it over the next few days.. :lol:

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williB

This is a 9 coil 12 magnet three phase generater.
Edit : Number of Coils to number of magnets Ratio must be 3/4 for three phase . in this case 9/12..
magnet dia. to coil dia. ratio = 1/2
the coil hole is 0.75"

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williB

I redid the 9 coil 12 magnet generator up above..
the new design is very symetric..
the coils are 1.5' dia , the magnets are exactly half that size.
the 9 coils are positioned out 40 deg. apart 360/9..
the magnets are positioned at 30 deg. intervals evenly spaced ..

if you rotate the magnets 15 degrees ccw , the voltage for phase A would be maximum.

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audioguru

I'm getting dizzy watching your coils and magnets going round and round. Around and around? Around and round? Round and around?
I gotta lie down. Bye. :lol:

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Uncle $crooge

williB

I tried to use different colors , but no joy.

williB

This is a 15 coil 20 magnet three phase generator , thats 5 coils per phase.
this diagram uses 1/2 " magnets ( the ones i have) and 1" coils , i've left out the hole in each coil, for clarity . phase A has the hole and the magnet in the same spot anyway..
I keep making small improvements to my 8 coil , single phase, exer-gen :lol:
today i put on a set of smaller dia. pedels and it enables me to to crank @ 341 RPM under load , and 389 RPM max no load speed.
I still am going to try the three phase generater , but it requires precise dia. coils as you can see , because they are right next to each other ..
Its hard to predict what a 9 coil three phase genny would produce, because thats only three coils per phase..and the coils would have to be 1" dia. instead of the ones i am usung now which are 1.5" dia. we'll see..

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bryan1

Eh Willi,
Mate the best person to ask this question by far would be Flux on the otherpower forum. But off memory using a 1/2" magnet on a 1-1/2" coil won't excite the maximum current in each coil. Why don't you replace those 1/2" magnets with say 1-1/2"x 1" then watch the output triple atleast.
but like I say I'm not an authority on wind gennies however if ya going to make a genny ya want the biggest output ya can get. So keep tryin mate and don't worry when I get my 2"x1"x1/2" Neo's I'll start havin some fun too.

Cheers Bryan

__________________
" The only way to avoid human error is to avoid the use of humans"

williB

2" x 1" x .5" ..... wow i just cant imagine the strength of those..
anyway i sort of designed your genny ( part of it ) ..
the outer large circle is 8" dia. the coils are 2" dia (at the wide end)
the coil smaller dia. is 1"
the center of each coil is 2'' long..
this gives .5" of wire on the side of each coil , and 1" of wire if they are right next to each other , as shown ..
is this what you are gonna do?
if not give me the specs and i'll draw it up for you..

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bryan1

Eh Willi,
The design of my genny will be very similar to Hugh Piggot's design, however I'll be making it 14" diameter using 3/8" thick disks. I have a pair of 11" diameter honda brake disc's but all my mates reckon it's too small a diameter to get a kilowatt. With the Neo's I'll be putting 12 on each disc for and I'm not certain on the coils yet but I'm thinking of 9 coils setup in 3 phase star at this stage but all that depends on the magnet wire I get. The reason I haven't gone full steam ahead on the genny is I haven't setup a dump load yet and the solar is pretty well keeping the batteries topped up. But with some of this heating wire I got I'm making up a hot seed raising bed for my wife.

Cheers Bryan

__________________
" The only way to avoid human error is to avoid the use of humans"

williB

i get my magnet wire free from an alternator repair shop.
the wire comes from large relays .
all i gotta do is take them apart.. :lol:
i dont have access to hugh piggots designs , doesnt he sell them..?