Dec 20th, 2006

[Spdlmt150]

After a lot of tinkering, I have decided to go with a dual rotor setup with some real magnets.

Here's what I have drawn up so far for the design.

Already on hand is the spindle - 2500lb trailer repair spindle, 5 lug hub, bearings.

The mag discs will be 11" cnc machined 1/2" thick. 12 mags 2 X 1 X .5

The stator will be .5 thick poured plastic.

Magnet face to magnet face airgap .550 minimum. Once the proper airgap is determined, I will add in an aluminum spacer between the magnet discs, just large enough to clear the studs to help prevent any twisting.

Magnet disc:

Stator (which will be elongated at the mounting bolts to provide more clearance - round was easier to draw)

Actual alignment/spacing of the mags/coils as drawn:

As soon as I have the money to buy mags & material, I will be setting up to start cutting. X-mas isn't the best of times to start a project, but here it goes.

This will be driven by a 7 ft 3 blade.

I'd appreciate any comments or suggestions that can be made to try to improve on the design.

[Flux]

Looks excellent.

It is going to be rather powerful for a 7ft prop, but depends a lot on your chosen cut in speed.

It would take an 8 or 9ft prop.

I am not convinced about making the coil sides radial, it won't hurt but I suspect that rectangular or a compromise between the 2 forms would give you a lower resistance with much the same voltage. If you want to keep down to 7ft then more resistance will not matter, you will need to add some externally.

Flux

[harrie]

Very nice, and I commend you for doing the research prior to building, It will pay off. Keep us informed on your progress.

Great Fun, Harrie