DIR Return Create A Forum - Home
---------------------------------------------------------
Lynx Wind Forum
HTML https://lynxwindforumhtml.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Wind Power
*****************************************************
#Post#: 2951--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 25, 2014, 9:11 pm
---------------------------------------------------------
Hello Lynx,
thank you for the warning....steady as she goes then....
[img][/img]
#Post#: 2973--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 27, 2014, 6:17 pm
---------------------------------------------------------
hello members..
I got the alt into lathe and spun her at 100rpm....the open
circuit voltage measurement was between 8.2v and 8.9v on any two
phases....it was constantly varying up and down ...
I hope this is normal ...
ohms was 6.5....
#Post#: 2974--------------------------------------------------
Re: backyard helix..
By: lynx wind Date: May 27, 2014, 6:50 pm
---------------------------------------------------------
Your alternator looks more suited for 24 volt charging. At 45
watts it is 50% efficient at 240 rpm It will take about 90
watts to turn the alt. Looks like a very good alternator!
For 12 volts it is 21% efficient at 280 rpm making 45 watts.
That means it will take 213 watts to turn the alt.
My friend runs a very good website with formulas to calculate
alternator efficiency at www.usvawt.com
Go to the engineering section scroll down to alternators, scroll
down to the "custom alt" where you can input your information.
The key is getting high voltage with low resistance.
#Post#: 2976--------------------------------------------------
Re: backyard helix..
By: nessprojects Date: May 27, 2014, 7:09 pm
---------------------------------------------------------
Hmmm You beat me to it Lynx.....I was just about to say that it
looks like a very nice alternator and should be good for 100w.
Hi tri-lobe....Good buy I think. :) ....I agree with Lynx that
it would have to spin up a little faster but much more efficient
on 24v.
#Post#: 2977--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 27, 2014, 7:58 pm
---------------------------------------------------------
Hello Lynx and Nessprojects.....
thank you very much for the replies and info....
the muddywaters are slowly clearing...
i'll have a play at usvawt.com tonight...
thanks again.
#Post#: 2978--------------------------------------------------
Re: backyard helix..
By: lynx wind Date: May 27, 2014, 8:06 pm
---------------------------------------------------------
I may have used the calculator wrong. I checked using another
approach and got better results for 12 volt. 6.5 Ohms is not
bad and neither is the voltage. That means the magnets are good
quality.
#Post#: 3437--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: June 22, 2014, 1:43 am
---------------------------------------------------------
Hello members....
an update on my backyard helix.....
first off 3 drive pins to connect mill to alt...[img][/img]
#Post#: 3438--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: June 22, 2014, 1:48 am
---------------------------------------------------------
I turned up some plywood with a spigot and 3 drilled holes to
match the alt....
this way I had an accurate connection between the two items that
maintained concentricity....[img][/img]
#Post#: 3439--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: June 22, 2014, 2:00 am
---------------------------------------------------------
I glassed the 2 horizontal timbers and attached the 3 blades....
I use 2 methods to attach my blades.....mechanical/angle
brackets and chemical/construction adhesive and fiberglass to
hold the blades on....
the construction adhesive can handle the chemical components of
the resin/ fiberglass....they work well together...[img][/img]
#Post#: 3440--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: June 22, 2014, 2:12 am
---------------------------------------------------------
the alternator shaft has 2 flats machined flats on each threaded
areas, top and bottom....so I made 2 off 3mm thick washers to
suit these flats ...
I then attached these washers to the two horizontal timbers with
screws....
I now have 3 points of mechanical drive....between alt and
mill...[img][/img]
*****************************************************
DIR Previous Page
DIR Next Page