Steve, Being non-magnetic, I didn't think aluminum would create any drag or cogging. mmmm. I'll take your word for it Steve. Thanks for the input! Loved Dan...
3249
Steve Spence
sspence65
Jun 1, 2011 10:26 am
Copper isn't magnetic either, but when a magnet is passed over it, electricity is generated. If there's no place for the electricity to go, it causes drag....
3250
Dan Fink
danbob88
Jun 1, 2011 2:04 pm
Hi Dan; * We've had numerous cracking problems in the past with polyester resin, but the switch to vinyl ester solved all of them. It's great stuff, higher...
3251
Dan Fink
danbob88
Jun 1, 2011 2:11 pm
Oops, didn't see this when I replied to your first one. An aluminum stator plate would cause serious eddy current problems. The only conductor suitable for...
3252
James Morris
james-morris...
Jun 1, 2011 11:01 pm
Dan, Does your book explain how to match your generator design to available wiind? ... From: Dan Fink <danbob88@...> Subject: [axialflux] Re: Coils To:...
3253
James Morris
james-morris...
Jun 1, 2011 11:01 pm
I forgot about eddy currents. Steve is right about using any electrical conductor as the base for the coils. Even if it is well insulated, it will have eddy...
3254
Charlie
charlieknox
Jun 1, 2011 11:11 pm
Hi guys - I'm wondering if any of you are aware of a wattmeter suitable for testing the output of wind turbines or solar arrays in the range of ~300 watts to...
3255
James Morris
james-morris...
Jun 1, 2011 11:30 pm
Aluminum will have zero effect on the magnetic lines, and if well insulated, will have zero effect on the electrical properties. I think Steve must have meant...
3256
Steve Spence
sspence65
Jun 1, 2011 11:32 pm
... SS> you need to rethink this. think eddy currents I think Steve must have meant that a large aluminum plate would create wind drag. SS> mo That would have...
3257
Steve Spence
sspence65
Jun 1, 2011 11:37 pm
I designed an inexpensive watt hour meter based on a Arduino. less than $100. I'll be posting a article on it soon, and offering a parts kit and instructional....
3258
ian_new@...
ian_new
Jun 2, 2011 10:17 am
Hi Charlie, A quick and simple solution to measuring average power output over a period of time is to use the power to drive a heater in an insulated water...
3259
Steve Spence
sspence65
Jun 2, 2011 10:20 am
I prefer using a hall effect sensor (current) and a voltage divider, multiplied by the arduino's built in clock function. You then have volts, amps, watts,...
3260
Dan Fink
danbob88
Jun 2, 2011 12:36 pm
My answers are *starred* below. Dan Fink, co-author, "Homebrew Wind Power" Executive Director Buckville Energy Consulting Buckville Publications LLC NABCEP /...
3261
Dan Fink
danbob88
Jun 2, 2011 12:58 pm
Hi Charlie; You didn't mention your system voltage, and you'll have to size the shunt or unit based on current. 4kW at 48 volts is 83 amps, but 4 kw at 12...
3262
Steve Spence
sspence65
Jun 2, 2011 10:56 pm
I'm not using a shunt, I'm using a hall effect sensor. No "breaking the line" to measure, and there's no affect on the circuit being measured. RS232 is easy,...
3263
Charlie
charlieknox
Jun 2, 2011 11:05 pm
Dan - our Piggott model is 24 volt. We have one from your design at 24 volts (exercycle), one at 48 volts (wind). I really appreciate your book, guys, and...
3264
ian_new@...
ian_new
Jun 2, 2011 11:24 pm
Hi Steve, I'm sure that having all those parameters on an easily read display is very convenient. Would I be right in assuming that it would cost considerably...
3265
Steve Spence
sspence65
Jun 2, 2011 11:30 pm
Great idea. Thanks. ... -- Steve Spence Renewable energy and self sufficiency http://www.green-trust.org http://arduinotronics.blogspot.com...
3266
Steve Spence
sspence65
Jun 2, 2011 11:34 pm
Not only convenient, but much more accurate. No wasting of power to take the readings either. A bit less than $100, so your assumption is correct. ... -- ...
3267
ecomm@...
invaders_fro...
Jun 2, 2011 11:59 pm
I wonder if you've looked at the Really Bare Bones Boards from moderndevice.com They are fully arduino compatible. I have an official arduino board and have...
3268
Steve Spence
sspence65
Jun 3, 2011 12:01 am
I have looked at them, but have been using the Arduino UNO and the Mega 2560 so far. Need to connect my fridge to one next week. ... -- Steve Spence Renewable...
3269
John Bishop
ka3ohh
Jun 6, 2011 6:27 pm
"Something cheaper than a trash can filled with water" that I've been wanting to try is using audiograbber to read amps on one channel and volts on the other...
3270
Chandan Singh
chandanva
Jun 11, 2011 1:15 am
Hello, Regarding the testing query, I wanted to learn about how everyone on here is testing their generators. I have been rectifying the output and then...
3271
Charlie
charlieknox
Jun 21, 2011 10:27 am
I was not aware of this development until yesterday: http://www.technologyreview.com/energy/25188/ but apparently the big boys have decided to forgo gearboxes,...
3272
J S
canamm1
Jun 21, 2011 11:46 pm
Typically when demand and supply of a particular commodity goes up the price goes down. Perhaps this will be a good thing for the wind genny homebuilders....
3273
Wales Druid
walesdruid
Jun 22, 2011 2:40 am
There was a piece in the comments about REE { rare earth elements } used to make the permananet magnets. In that, it said there have been developments to...
3274
MIKE DURKIN
seth_otherpower
Jun 22, 2011 2:41 am
What I noticed is the date of the article - its over a year old. To: axialflux@yahoogroups.com From: canamm1@... Date: Tue, 21 Jun 2011 23:04:15 +0000 ...
3275
Charlie
charlieknox
Jun 22, 2011 2:41 am
Dave - perhaps you are right. I hope so. I suspect the earth's supply of Silicon far exceeds the supply of rare earth magnet materials, though. Time will...
3276
Steve Spence
sspence65
Jun 22, 2011 2:46 am
There's nothing rare about rare earth elements. It's just a scientific term for that section of the periodic table. On Tue, 21 Jun 2011 20:21:55 -0400, Wales...
3277
Nick Andrews
nicothefabulous
Jun 22, 2011 10:06 pm
So-called 'rare earth elements' are not actually that rare. They are everywhere, just not in the most easily-accessed forms. Most have to be purified by...
