Axial Flux Motors

What do you guys think of axial flux motors? They claim to be more efficient (5x).

https://spectrum.ieee.org/transportation/alternative-transportation/this-insideout-motor-for-evs-is-power-dense-and-finally-practical

The efficiency of the motors we use is around 90% I think. Hard to get 5X better than that. Even the old brushed DC motors in power tools are over 60%.

Reading the article I see that the promise is 4-5X the mass power density. I.e. same power in a much lighter package. A big improvement but the batteries are our biggest limitation.

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Quite a few axial flux motors out there. Also, watch out for lots of fluff in advertising. here’s an interesting thread:
https://www.endless-sphere.com/forums/viewtopic.php?f=30&t=101445&sid=df1500eea6fde3f1cb31b311e24765ff

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