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YASA beats own power density record pushing electric motor to 59kW/kg benchmark

(yasa.com)
66 points breve | 3 comments | 22 Oct 25 20:54 UTC | HN request time: 0.001s | source
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pinkmuffinere ◴[22 Oct 25 23:15 UTC] No.45676350[source]▶
> The motor’s performance on the dyno has exceeded even our most optimistic simulations

Not to take away from the exciting achievement, but I always found comments like this kindof unusual. Really, it exceeded even your _most optimistic_ simulations? If the high end of your simulated performance was below what you actually measured, I am worried that your simulation is seriously neglecting something. I used to work in decent depth with three phase bldc motors, so I feel I can say with some authority that these things _can_ be simulated, and while real world data is hard to exactly predict, getting something outside of the predicted range would generally be interpreted as a sign that your simulation isn't so good. But maybe this is just marketing-speak, and their simulations are actually totally fine.

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1. watersb ◴[23 Oct 25 04:38 UTC] No.45678211[source]▶
> I used to work in decent depth with three phase bldc motors, so I feel I can say with some authority that these things _can_ be simulated

If I take it literally versus hyperbole and excitement, could there be uncertainty coming from the drive train design choices, system integration details?

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2. pinkmuffinere ◴[23 Oct 25 05:43 UTC] No.45678527[source]▶
Sure, but that sort of uncertainty should only increase the range of values you see out of the simulation. You could say “efficiency may range from 60% to 80%, so the output torque will range from X to Y”. If the real result is bigger than Y, something has gone wrong in your modeling or assumptions
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3. yetihehe ◴[23 Oct 25 06:27 UTC] No.45678802[source]▶
> something has gone wrong in your modeling or assumptions

Maybe they used a "all our previous tests showed 95% of efficiency compared to simulation, so let's multiply all our results, including top efficiency by this". Then their newest motor had 97% efficiency comparing to previous model.