Flat brushless motor for velomobile

[thibr]

it evokes the losses by eddy current
remain the joules losses in the copper and the friction I forget?

[izentrop]

In any case, come back and give us the results of your work.

[Teach]

before manufacturing, even with a ladle, I have to estimate a power according to the average diameter and the intensity, and there is no gain ...
but thank you for your comments, it helps;)

[izentrop]

Found on the net

Halbach gratings are good at reducing inertia and weight, creating very uniform magnetic fields. where weight, inertia and volume are not a problem, they are not cost effective for electric motors. https://www.fieldlines.com/index.php?topic=149088.0

He had been disappointed with the couple obtained: http://build-its-inprogress.blogspot.com/2015/02/

The number of conductors under the field of a magnet is much less than in the classic case (Laplace's law) https://www.hsmagnets.com/blog/axial-flux-motor-magnet/ (looks a lot like the Magnax you mentioned).

To compete in power, it would be necessary to increase the number of wound cakes, which would increase the air gap and reduce the blows available power and increase losses. Ferrous-core coils (with reduced eddy losses) remain the most efficient solution. https://www.semanticscholar.org/paper/O ... f3df4f668a

the outputs of the piggott, with closing of the static magnetic flux and without any metal part other than the coils

The stator is conventionally embedded in the resin https://heliciel.com/Library/generateur ... 0axial.pdf with the most flattened coils possible.

[izentrop]

For info, Bernard Cauquil, reference in solar bike which accumulates the daily kms (7000km in 25 days, respect!), explores the all-electric transmission, and it seems to me an extraordinary path, which becomes extremely interesting if the engine / generator outputs are improved: silence, flexibility, weight, ease of installation ...

Look, same very classic engine that is also found in hoverboards and scooters https://www.pedelecforum.de/wiki/doku.p ... econtinent

[Teach]

Found on the net
Halbach gratings are good at reducing inertia and weight, creating very uniform magnetic fields. where weight, inertia and volume are not a problem, they are not cost effective for electric motors. https://www.fieldlines.com/index.php?topic=149088.0

Well precisely: weight, inertia, that's what we want to avoid for a wheel, even if the volume can be considered sufficient!

He had been disappointed with the couple obtained: http://build-its-inprogress.blogspot.com/2015/02/

I know this project well that I studied: as already mentioned, by tilting the wires it greatly simplifies the winding but to the detriment

- an inclination of the resulting force, which decreases the torque
- a partial exit of the wire outside the zone of the magnetic field of the permanent magnets

The combination of the 2 can explain its weaker torque than expected ...

To compete in power, it would be necessary to increase the number of wound cakes, which would increase the air gap and reduce the blows available power and increase losses. Ferrous-core coils (with reduced eddy losses) remain the most efficient solution. https://www.semanticscholar.org/paper/O ... f3df4f668a

Or increase the intensity while cooling, which the Magnax does it seems ...
The 'coreless' or 'ironless' are the densest designs in several ways. Your link allowed me to access thereof which describes well the interest of the design even though they have not implemented a Halbach arrangement!

[Teach]

To compete in power, it would be necessary to increase the number of wound cakes, which would increase the air gap

Thank you for this remark even if it is not necessarily justified ^^
In my 3D, I made every effort (as on the one at the angle of the link!) To pass the threads from front to back, which generates crossings and prevents me from tightening them more, and in addition weakens the 'sheet 'which serves as a support and stator.
But I have room outside the area scanned by the magnets! I should therefore be able to leave the wire on the same side (and go down again facing the reverse pole) and suddenly tighten them twice more, while keeping a series of wires on each side of course!
The analysis of what exists is both necessary and interesting, but we should not get bogged down in it
And like what your comments can be constructive, even if they are rather, to my taste, on the brake pedal
I'm going to go back to modeling ...

[izentrop]

increase the intensity while cooling, which the Magnax does it seems ...

It is above all for the purpose of saving weight for an engine intended to equip a vehicle or a wind turbine.

But I have room outside the area scanned by the magnets! I should therefore be able to leave the wire on the same side (and go down again facing the reverse pole) and suddenly tighten them twice more, while keeping a series of wires on each side of course!

To increase the number of conductors, I don't think Litz's wire, intended for high frequencies, has any use in this kind of motor.

prevents me from tightening them more, and in addition weakens the 'sheet' which serves as a support and stator.

You consolidate by drowning in resin in the end, I guess?

They too practice the Halbach networks

On a discoide engine you cannot optimize as well, since there is not enough space near the center.