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A question for Flux


By solarengineer, Section Mechanical
Posted on Wed May 10, 2006 at 01:25:11 PM MST
A question for Flux

Hi Flux, I was going over a post you recently wrote to a user, not sure of his name im having trouble finding the post again. He was winding a stator 6 couls 8 magnets using 1 3/8 magnets... he wanted to use 200 turns of #24

You had advised him to go with 100 turns of about 16 guage wire with a 5ft prop with a tsr of 6 and he should get about 150w..

But you also told him that he could have made a better machine with the same sized magnets.

My question is, I have 1 inch by 1/2 inch n40 neodyniums. I want to wind the most efficient machine i can for 12 volts.

Could you give me some idea as to what you would do in this case?

I was going to attempt #20(2 in hand) for 70 turns on a dual rotor with 9 coils 12 magnets per rotor.

Thanks Flux

Jamie
A question for Flux | 5 comments (5 topical)

Re: A question for Flux (3.00 / 0) (#1)
by Flux on Wed May 10, 2006 at 07:44:42 AM MST

Yes I do remember something like that. I seem to think that the original intention was to use 12 magnets but someone convinced him that they were too close an he ended up with 8 on the same sized disc. I think he would have done better to have kept the 12 magnets although they would not have been used to best advantage.

You only give your magnet size, it is impossible to give any help without knowing how many you intend to use. Don't pick turns and wire size out of the air, that just doesn't work. give me all the details.
Flux



Re: A question for Flux (3.00 / 0) (#2)
by solarengineer on Wed May 10, 2006 at 12:24:13 PM MST

Hi Flux, thanks for the reply. I thought i posted number of mags...i was rushin sorry

im using 12 magnets per rotor with dual rotors... i wil have the rotor cut to size once i know the best coil size and magnet spacing. I wound one with 70 turns (2 in hand) of #20 since its the only wire i have on hand and the coil came out with a 3/4" hole and 1/2 inch legs for a total round diameter of 2"

Thanks for your help.. its really appreciated!

respectfully

Jamie



Re: A question for Flux (3.00 / 0) (#3)
by Flux on Wed May 10, 2006 at 01:08:18 PM MST

I should go for 8" discs.  You are in the right order with the coils. I would think you can manage with 60 turns and with 2 in hand you should manage #18 or if you are careful #17. Single wire you may manage #14.

Make the holes in the coils about 1" tall but you can reduce the width a bit to get more wire in. Even if the width of the hole has to come down to 3/4" wide it will be ok.

This should work with a 7 ft prop for normal areas. If you are in a very poor wind area you could push your luck to 8ft with a prop of tsr 7.

You will need to furl to keep it below 30A.

These figures are based on square magnets but should be close. If possible, do a test coil. You are aiming for about 3Vac per coil at about 200 rpm

Aim for a stator about 1/2" thick or at least when potted with fibreglass and resin make sure it will run in a magnet gap of not over 3/4"

Flux

[ Parent ]



Re: A question for Flux (3.00 / 0) (#4)
by solarengineer on Wed May 10, 2006 at 01:41:17 PM MST

Thank you so much for all of your help! I'm going to follow this exactly!
VERY EXCITING!!!

my expertise is in microcontrollers so if you need a hand with any of that let me know!!

I have been working on an automatic diversion controller with 4 outputs for 4 different sized dump loads... like 100w, 200w, 300w, 400w

then the controller would monitor the rpm, voltage and output current and decide the best combination to keep things constant.... there are 16 possible combinations there.

I'll start with that then I will post it!

Thanks again!!!!

Jamie Delaney



Re: A question for Flux (3.00 / 0) (#5)
by alcul8r on Wed May 10, 2006 at 07:19:17 PM MST

Actually, that's only 11 combinations, but if you are using PWM dumping it can be at least 256 values and only use one of your pins if you have 8 bit resolution.

If you want your full 16 possibilities from your 4 bits, use values like 50, 100, 200, and 400.  or 1, 2 4, and 8 hundreds.
alcul8r KansasWind.com
[ Parent ]



A question for Flux | 5 comments (5 topical)
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