Quote from: Yucca on June 08, 2009, 12:54:42 PM
It's an outrunner, so rotating mags on the outside of the stationary coils, I don't know whether the mags are in Hallbach config? Maybe they are?:

I believe they use Halbach arrays in order to have a brushless motor.  There may be other ways to have a brushless DC motor other than with a Halbach.

Low-Q has a RC airplane brushless motor that is in a Halbach configuration.  Maybe he could answer this question.

Thanks for the link,  I will buy one when I have the opportunity.

Hi GB,

it probably is hallbach config then. here's a pic of my favourite outrunner, tiny, fast and really high power to weight ratio. You can see my bigger motor with neo disk on the bench.

@gravityblock, @Yucca,

The drawing is an idea at this time. We can change it when we know what works or not. The drawing shows the generator from the side as a "cut through". My plan was to use two copper discs and make the discs threaded on the inside of the hole at the axle. Then two copper tubes, threaded, on the outside will fit into the copper discs. The copper tubes (insulated from the axle) will extend to each side of the axle, thus allowing us to use brushes on each side. Both discs are connect together at the rim with an outer copper tubing secured to the discs with bolts. This is the basic idea. The Neo magnets can be stacked any way we like to get the desired effect of putting the discs in series at the rim. If needed, the discs and magnets can be put at larger distances apart from each other. Everything will be glued together with epoxy glue. The outer casing is soft Iron to prevent magnetic back coupling. This will reduce some breaking effect, I hope.

The outer casing will also make the rotor very strong and allow a high rpm. I think I will take a slow approach to this design and we must first test the method on a smaller scale to see if it is doable or not, before I start using serious chunks of money and time on this. The best solution will be, if it is possible, to put several discs in series on the same axle to get higher voltage out of the generator, maybe as high as a lead acid battery charge voltage. If not, then I can easily design a power inverter that take a small voltage (at high current) and then transform it to a higher voltage at low current.

My main question at this time is, can we stack many discs to get a higher voltage output? And, can we use just two brushes at each end of the axle to do that? If we can answer those two questions with tests on a smaller scale, then I see no reason why we can't scale this generator up to provide huge amounts of power.

Groundloop.

Quote from: Groundloop on June 08, 2009, 03:32:25 PM
The best solution will be, if it is possible, to put several discs in series on the same axle to get higher voltage out of the generator, maybe as high as a lead acid battery charge voltage.

You can buy single cell 2V lead acids of exceptional quality for quite good prices, maybe ideal for a prototype if the idea works out, 2V sounds doable with reasonably sized discs.

http://shopping.microbattery.com/s.nl/sc.2/category.704/.f

Quote from: Yucca on June 08, 2009, 12:54:42 PM
It's an outrunner, so rotating mags on the outside of the stationary coils, I don't know whether the mags are in Hallbach config? Maybe they are?:

They may alternate n-s-n-s. Have a look at the stators of the generators on
larger motorcycles. Put "stator" into Ebay under "Cars and parts".