Jeremy Harris wrote:
I'm no expert in magnetics, but I wonder what the impact on performance would be for a rotor machined from a big diameter solid bar of something like Delrin, with peripheral holes CNC bored right at the outer edge to take the magnets, revolver-style? Maybe a very thin wind of carbon fibre tow around the outside would hold the whole thing together at high rpm?
Jeremy Harris wrote:3. Winding flat, overlapping inrunner coils should be fairly straightforward, these could then be wrapped around a slightly oversize dummy rotor mould, then encapsulated. Ideally the windings could, perhaps, be bonded to a iron outer ring at the same time, to enhance thermal conductivity as well as complete the magnetic circuit. I can't see an obvious way to make a motor without an outer iron can, without the added complication of having an outer ring on the rotor, with another Halbach array.
Jeremy Harris wrote:I rather like the idea of a very big inrunner, as it has the potential to give high torque and dissipate heat a bit more effectively than an outrunner. It would be pretty easy to fit fins to the outer case to enhance it's thermal properties, something that's hard to do with the other configurations. Although high efficiency is very desirable, I think lot's of us would accept an efficiency loss if the resulting motor was affordable and easy to build, perhaps from a kit of CNC'd components.
enoob wrote: i had thought derlin , ill see if i can find info on how it reacts to heat .
enoob wrote:indeedee doo . starting to like the derlin idea . i think i can get it locally in 1" thick sheets and it looks like the magnets would give up before the derlin would. interesting.
rhitee05 wrote:You could solve a lot of this problem if you had a machined piece of steel or iron that filled in the gaps between magnets, but that takes away a lot of the easy-to-build advantages of this design.
Miles wrote:Stacked plates? I guess it could be much thicker plates than are needed for a stator as there'd be no need to minimise Eddy currents.... This technique might be more applicable to a large inrunner?
rhitee05 wrote: Better than just round magnets alone, and having that steel would also provide structural benefits for the rotor.
rhitee05 wrote:...I ran another model to see what the effect would be:
Those are nice models, thank you for posting them.
9 magnets seem to be a recuring theam in the halbauch array. Are there any other configurations?
If I am interpreting the graphics correctly the 9 will unite to make 1 pole.
Origanly I assumed it was the lower pole count that was detrimental at the scale some of us are working at or
perhapes it is just weaker magnets, very small magnets assembled to create the H.A.
Either way, I apreciate the visuals. please keep contributing.
Miles wrote:I think that everything enclosing the magnets needs to be steel.
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