The next steup up in hub motor efficiency may be -

Electric Motors and Controllers
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rumme
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The next steup up in hub motor efficiency may be -

Post by rumme » Wed Nov 01, 2017 9:50 am

The next step up in hub motor efficiency, is to have manufacturers mold their hub motor shells, so they have cooling fins/ heat sinks as part of the hub motor . Not having to use thermal glue and having the heat sink as a complete part of the hub shell, should only make it more efficient at shedding heat. Wonder what manufacturer will be the first to
offer such a setup ? I understand that this upgrade to a hub motor would raise the price a bit, but it is truly a simple way to better efficiency and would eliminate the need for consumers to buy separate heat sinks, thermal epoxy, and then have the possibility of not installing the heat sinks perfectly for optimal cooling .

Does anyone know if any company has offered a hub motor with heat sinks as part of the hub motor shell / as 1 complete unit manufactured into the mold casing ?

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Re: The next steup up in hub motor efficiency may be -

Post by SlowCo » Wed Nov 01, 2017 11:55 am

Shedding heat is not efficient. Not producing heat in the first place is...

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madin88
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Re: The next steup up in hub motor efficiency may be -

Post by madin88 » Wed Nov 01, 2017 1:54 pm

SlowCo wrote:Shedding heat is not efficient. Not producing heat in the first place is...
+1

the losses square with current (P loss = I² x R).
aside of asking manufacturers for improved heat shedding, we should ask for a a better general design with lower copper losses.

rumme
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Re: The next steup up in hub motor efficiency may be -

Post by rumme » Wed Nov 01, 2017 2:42 pm

SlowCo wrote:Shedding heat is not efficient. Not producing heat in the first place is...
I doubt we will soon see any affordable hub motors have the ability to never create heat . Shedding heat quicker helps efficiency and having hub motors with integrated heat sink fins { not glued on} built right into the mold of the hub casing, should be a solid next step forward without costing a ton more to purchase.

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Re: The next steup up in hub motor efficiency may be -

Post by amberwolf » Wed Nov 01, 2017 4:24 pm

The best thing is not to produce the heat in the first place.

Any heat you make is wasted energy.

If you pick the right motor (winding and size) for the job, in the right size wheel, with the right controller and battery, and heat won't be a problem.

Whenever you have a motor that gets so hot that it needs extra cooling, it's being run beyond it's design, and it's the wrong motor/controller/battery for the job.

It doesn't mean that you can't use them anyway, and just add extra cooling, but it's not more efficient to do that--it's still less efficient than using the right parts to start with.

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Re: The next steup up in hub motor efficiency may be -

Post by atarijedi » Wed Nov 01, 2017 10:06 pm

Maybe heatsinks sticking out perpendicular, but they won't make them like hubsinks. I can only imagine the pain in the ass it would be to lace a hub with something like hubsinks installed already and not able to remove them. No thanks.

The next step in hub motor efficiency will be using different compounds for the stator, possibly using 3d printed stators that are a single cohesive piece, instead of laminations. Where the particles are separated from each other by the bonding material, to significantly lower eddy currents.

Also using different metals, so we can get a higher saturation.

Possibly also using curved teeth and curved magnets, so we can have a higher surface area for the magnets and stator teeth faces, with the same widths which would increase magnetic force between the rotor and the stator.

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Re: The next steup up in hub motor efficiency may be -

Post by billvon » Wed Nov 01, 2017 11:44 pm

rumme wrote:The next step up in hub motor efficiency is to have . . . .
Superconducting windings! Liquid nitrogen instead of Statorade. Only problem is all the ice you pick up on the outside of the motor .. .
--bill von

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