Stator for 18' completed - assembled for testing

[Dave B]

My stator,

 20- 1x2x 3/4" N40 neos per 16" diameter 1/2" thick rotors. Wests System Epoxy with adhesive filler for the magnets and same for the stator plus fiberglass mat top and bottom with some additional chopped fiberglass. I used the slow cure hardener and left this in the mold for 2 days before wrestling it out of there, it turned out great. I used what I thought was plenty of Johnsons Paste Wax for the release agent on the mold and looking at it now I think I should have tapered the edges of the cutout more and then it probably would have fallen right out. It is nearly 3/4" thick with 15 coils each of 145 winds single strand #16. Airgap between magnet faces is slightly over 1" for now. This is a 3 phase - star set up and unloaded AC voltage across each phase output measures 36 vac @ 60 rpm ,  74 vac @ 120 rpm and 114 vac @ 180 rpm. I plan to heat water direct with no batteries and will probably design my own variable load controller. Keep your eyes out for the blades posting in the near future, it should prove to be very interesting. Comments always welcome, thank you.  Dave B.    

[CompDoc]

Very nice work!  You are a true craftsman for sure.

[tecker]

What's the resistance per phase . Maybe it's in a prior post But I don't see it .I like this idea  I'm trying to get somme reactance calculations here . Maybe match up ther VA with other tranformers and see what kind of heat build up these will see.

[mitcamp]

Dave B Excellent work, will be watching, especially the variable load controller. Good Luck.      Mitcamp

[willib]

Dave , what are you using for a hub , with six studs ?

nice work

[Dave B]

Thank you for the comments. Just by coincidence there is approximately 100' of #16 per coil of 145 turns each. This works out to be .4 ohms per coil and my Fluke measures 4.0 ohms exactly for 10 coils series connected per phase. Setting up the furling to safely protect the stator for my application will be very important and any help or suggestions figuring a "safe" range of power would be appreciated. I am thinking that the stator itself should be able to disipate 750 watts up to possibly 1500 watts short term. I know the West System Epoxy is not rated as high of temperature as say the vinyl ester type which is another consideration and why I'm wanting to keep this a slow and safe machine. The hub is a new 6000 lb trailer hub. Any comments or help with calculations and power suggestions are appreciated. Thank you,  Dave

 

[fanman]

hello dave b

this is fanman here, ive been off the net for a while and now im back. and i will tell you that your gen is awesome, great job, it looks like the one i built a winter ago, im very interested in the controller you will build to control your heaters,  the fab work looks sweet

great job

[tecker]

Maybe 500ft per at 2 ohms

[harrie]

Very nice Dave, high voltage at low RPM, it will be interesting to see how this one works out for you. Keep us informed.