I just "discovered" axial-flux alternator for windpower this weekend. I regret not coming across it a few years ago - I'd have a wind-farm up by now! I always...
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Brian Schulz
capefalconkayak
Oct 20, 2006 5:43 pm
Hi, this is my first post here so I'll introduce myself, I'm Brian, a guy who knows alot about boat building and nothing about electricity. I'm giving myself a...
159
Darald Bantel
o1bigtenor
Oct 21, 2006 12:22 am
... First you need to start with data. Volume of water per unit time Drop of the water (height from initial inlet to final drain) After this has been...
160
James Washer
kg7hh
Oct 21, 2006 1:55 am
After my last ramble, I thought I'd add some math/numbers Take your flow rate per 1second... Let's say you've got 1gallon/second.That's 3.78 litres per second,...
161
James Washer
kg7hh
Oct 21, 2006 1:56 am
It seems to me there's a bit more to it than that. Consider for example two extremes. 1)The generator requires more torque than the wheel can provide (after...
162
Kirk McLoren
kirkmcloren
Oct 21, 2006 2:00 am
The water wheel is a gravity engine. The rim speed represents lost head. I use the 5%rule. I allow 5% for a process. Fopr example the wheel is 10ft in...
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James Washer
kg7hh
Oct 21, 2006 5:57 am
responding a second time to my own posts.... I guess if a wheel carries the a given amount (mass) of water a given distance(m) in a given time(s) then that...
164
James Washer
kg7hh
Oct 21, 2006 6:05 am
results of googling... nice article http://sleekfreak.ath.cx:81/3wdev/VITAHTML/SUBLEV/EN1/WTRWHEEL.HTM On Fri, 20 Oct 2006 16:58:37 -0000...
165
michaeltechelectric
michaelteche...
Oct 22, 2006 1:15 am
I have two windmills I have built for my dad one with Jerry blades and the other with Hornet blades. Neither have an alternator yet but dad is working on it....
166
x xx
lesleynward
Oct 22, 2006 3:54 pm
... Well, yes, there is, but for overshot wheels the ancients (people of my grandparents' generation) worked it out quite simply: The torque generated is the...
167
Brian Schulz
capefalconkayak
Oct 22, 2006 3:55 pm
Ok I see where you guys are coming from, build the wheel and then build the gernerator to suit the wheel. That makes sense, I'm not sure how I'll measure the...
168
Patrick L. McGillan
pmcgillan
Oct 22, 2006 6:17 pm
Had a thought on this to share. What about a magnet on each spoke and a arc shaped panel with three or more coils on it mounted out near the edge where the...
169
David G. LeVine
sirdave144
Oct 23, 2006 3:39 pm
... Simple answer, as long as you build a non-cogging (windmill friendly) alternator, you can live with oversized. Remember that the torque to run an...
170
madhav_chowdhary
madhav_chowd...
Nov 7, 2006 2:25 pm
Hi, This is about "Tower Height and Location" problems in related to Small wind Turbine. I had personally experienced difficult time due to practical problems...
171
michael_98_99_2000
michael_98_9...
Nov 17, 2006 1:38 pm
Hey everyone: I'm a mechanical engineering student at Virginia Tech working on a wind turbine for my senior design project. I have been looking at the "wind...
172
Steve Spence
sspence65
Nov 17, 2006 3:21 pm
the bearings are wrapped with electrical tape for a interference fit. there are washers and nuts bolting the threaded rod to the inside race. Steve Spence ...
173
Michael Kacmarcik
michael_98_9...
Nov 17, 2006 6:15 pm
Oh ok, so instead of finding a way to attach the rod to the inside diameter of the bearing, a washer is pressed firmly on top of the inside race by a nut. I...
174
James Washer
kg7hh
Nov 20, 2006 1:05 pm
The charts I see on the power and voltage output from axial flux generator shows quite a bit of voltage variance with respect to shaft speed. This leaves me...
175
Rich
rainbird997
Nov 20, 2006 5:10 pm
Hello all, I've been reading, planning and dreaming, off and on now, for a couple of decades about getting off-grid, and building a quiet little homestead-y...
176
Dan Fink
danbob88
Nov 20, 2006 6:51 pm
These power curves went up recently on our discussion board, http://www.fieldlines.com/ and we thought they would be of interest here. We tested the...
177
Dan Fink
danbob88
Nov 20, 2006 7:23 pm
Hi Jim -- Voltage and RPM output have a linear relationship with these alternators. Double the RPM, and you've doubled the voltage. What varies with RPM is the...
178
James Washer
kg7hh
Nov 20, 2006 11:24 pm
Ok... that (mostly) makes sense (to me)... so, here's a followup question. Wouldn't one want to design the generator to be somewhat compatible with the battery...
179
The Real Seed Catalogue
seeds@...
Nov 20, 2006 11:38 pm
Hi Jim, the simplest approach is to feed the output directly to your batteries. They can then absorb whatever is available. A seperate circuit connected to...
180
Steve Spence
sspence65
Nov 21, 2006 2:36 am
the windings are different for each pack voltage. I highly recommend reading the back issues of essn magazine (http://www.rebelwolf.com) and back home ...
181
easyfly51
Nov 21, 2006 4:44 pm
... Hello Again I will try to post again. And my first post. Looking at #27 is the inside pipe put on a lathe at all. I am still don't understand this how it...
182
Steve Spence
sspence65
Nov 21, 2006 9:19 pm
no lathe work, no heavy tools. there is a pipe inside that just sets the gap between the bearing shells. they are wrapped with electrical tape to make a tight...
183
easyfly51
Nov 22, 2006 12:00 am
Hello Steve Been looking over pictures and think I am getting the bearing part. It looks like 1.5" dia pipe. Question when you say the tail furls does it do...
184
Steve Spence
sspence65
Nov 22, 2006 1:27 am
wind speed pushes the tail uphill, gravity pulls it backdown, which rotates the blades out of the wind. Steve Spence Director, Green-Trust ...
185
James Washer
kg7hh
Nov 22, 2006 1:38 am
I'm confused by this whole "tail furling" thing to.. how does that work On Tue, 21 Nov 2006 23:13:11 -0000...
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James Washer
kg7hh
Nov 22, 2006 2:41 am
so... when the tail goes up... do the main blades just turn such that the ends of the rotor are in line with the wind. Why wouldn't it just rotate down wind...
