Hello all, I would like to experiment a little with a small scale generator using a variety of prime movers (gas, diesel, steam, wind). That part is not a...
3522
solar@...
kk4hfj
Nov 9, 2012 8:21 pm
Generators do not produce a particular current, they supply whatever current is being called for by the load, right up to rotor lock or coil burnout. Steve...
3523
simone
k5mmx
Nov 9, 2012 8:22 pm
I Think the best way is to use/adapt a marine wind generator, they are already made for low RPM and some have built in charging control (other are just a bare...
3524
kurtee
Nov 9, 2012 8:22 pm
A while back I built one of these induction motor generators. http://www.qsl.net/ns8o/Induction_Generator.html The key is to spin them a slight bit faster than...
3525
solar@...
kk4hfj
Nov 9, 2012 8:24 pm
That would be wonderful if this was a induction generator group. Sadly, we only discuss axial flux permanent magnet alternators here. It is possible to build a...
3526
Snarky Gnome
jkrobbie
Nov 9, 2012 8:58 pm
That's my point. I'd like to try building an axial flux generator that is small in both physical size and wattage output, but stable at hertz and voltage. I...
3527
solar@...
kk4hfj
Nov 9, 2012 9:01 pm
hz and voltage stability is controlled by the stability of the device driving the alternator. Amps out is determined by the load you apply, the ability of the...
3528
Snarky Gnome
jkrobbie
Nov 9, 2012 9:44 pm
Okay, this is some of the info I'm looking for. Any ideas, based on the parameters I've given, how many coils I would need? How many windings per coil and what...
3529
kk4hfj
Nov 10, 2012 2:13 pm
3 coils per phase, 35 windings per coil for 12v, 72 for 24v, 144 windings for 48v. ... -- Steve, KK4HFJ http://www.green-trust.org http://www.essnmag.com ...
3530
Chris Stokes
stokes0520
Nov 11, 2012 4:44 am
I wonder if you can get 200 watts with a 6 inch rotor at 700 rpm. Most of the Piggott examples have a larger diameter, like 10.5" for a bit higher power. What...
3531
kk4hfj
Nov 11, 2012 1:06 pm
Just make smaller coils, with smaller magnets. The diameter is not critical, just the ratio of magnets to coils, and the number of turns per coil. You may have...
3532
Snarky Gnome
jkrobbie
Nov 11, 2012 7:50 pm
Let me phrase the question a different way. First, here are the parameters: -200w -60hz -24v -3 phase -at 900rpm (let's just make this constant to simplify...
3533
kk4hfj
Nov 11, 2012 7:53 pm
You already answered the number of coils. 3 per phase, 3 phase, is 9 coils. That means 12 magnets per side (24 total). Size the coils so that the magnet passes...
3534
Snarky Gnome
jkrobbie
Nov 11, 2012 10:04 pm
This helps tremendously! Thanks...
3535
Jim Zak
jzlz0706
Nov 12, 2012 10:41 pm
Hey KK4HFJ, I'm going to "piggyback" on here. I want to build on a even smaller scale (3" diameter), but my drive speed would be variable - anywhere from 0...
3536
kk4hfj
Nov 12, 2012 10:49 pm
Design unit to handle max expected wind speeds, using a furling tail and emergency shorting brake for higher than expected wind speeds. design unit to output...
3537
jon dyer
hawkatyou
Nov 13, 2012 2:38 pm
Hello everyone, I am new to the group and Yahoo groups for that matter. So I apologize if I am jumping into another string or starting this incorrectly. I am...
3538
b_q_davis
Nov 13, 2012 5:37 pm
I am not sure what schematic you are looking at but here is one explanation. There are two ways of showing current flow. The traditional Franklin Fluid Flow...
3539
kk4hfj
Nov 13, 2012 5:48 pm
I f you put the ammeter between the wind turbine and the rest of the system, it will show production. If you put it between the load, and the rest of the...
3540
jerry freedomev
freedomev
Nov 13, 2012 9:19 pm
                             Hi Byron, Jon and All,                                     I...
3541
jon dyer
hawkatyou
Nov 13, 2012 9:22 pm
Thank you Byron and KK4Hfj, I would like to be able to monitor my usage/ draw on the system and the input/ supply from the generator. The schematic for the...
3542
jon dyer
hawkatyou
Nov 13, 2012 10:21 pm
Thank you Terry, that is correct I am not interested in the method but rather how to measure both as you outlined below. Jerry you mention "measure battery...
3543
solar@...
kk4hfj
Nov 13, 2012 10:25 pm
load is what you are powering, source is what is generating. storage is your batteries. wind (and water) axial flux alternators do not have "charge...
3544
jerry freedomev
freedomev
Nov 14, 2012 12:02 pm
                                      Hi Jon and All,  ...
3545
jerry freedomev
freedomev
Nov 14, 2012 12:03 pm
                         Hi Steve and All,                                          Not...
3546
solar@...
kk4hfj
Nov 14, 2012 12:06 pm
We are referring to axial flux units. The furling tail helps, but in very high winds, without a load, it's bye bye blades. The electric brake becomes the load...
3547
jon dyer
hawkatyou
Nov 14, 2012 2:37 pm
Steve, I thought that the charge controller was the unit that monitored the state of charge and diverted the excess power to an external load?  Jon Dyer ...
3548
solar@...
kk4hfj
Nov 14, 2012 2:40 pm
Typically a charge controller (solar apps) sits between the source and the battery, and disconnects the source when the battery is full. This does not work in...
3549
jon dyer
hawkatyou
Nov 14, 2012 5:32 pm
It seems as if that would put undue usage on the battery, by draining it when full so that it could be charged again. Doesn't it make more sense to stop...
3550
solar@...
kk4hfj
Nov 14, 2012 5:34 pm
It doesn't "drain it" just loads it enough to reduce the overage. You can't "stop" the current from a wind turbine, it needs to be loaded. Steve Spence, KK4HFJ...
