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is it because magnets probably not.
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Best way to get accurate numbers on this, is by getting a tempgun and run the motor with a segmented rotor and a non segmented rotor. measuring the temps will tell for sure.
I will run big motors, with a lower KV at higher voltages.
I like to do speedruns, (100 percent WOT) so the partial load doesn't tickle me too much either. but when you need a big motor (such as a 2250-2280 size) their are not much other options than the lehners either..
I had a bigmaxximum (plettenberg) which was less smooth and IMO less powerfull than the feigao 7XL. (for a 1/3rd of the price)
I don't think good motors need to be expensive.
It sounds quite logical to me, that segmented magnets are better, otherwise the high end motor producers wouldn't use them anyway. It needs to be of some use doesn't it? And that 1% better would be at complete wot, the numbers differ on partial load. (better than a non segmented period)