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Originally Posted by Serum
But the statisfaction of the magnet is reached pretty soon on the hvmaxx.
It's got a tiny 12mm rotor;
You said a hvmaxx was more efficient than an XL;
but that's quite familiar on partial load with segmented/sintered magnets;
Did you take this into consideration;?
a 1000 watt setup at 93% eff. gets 70 watts of heat;
a 1500 watt setup at 95% eff. gets 75 watts of heat; while the 1500 watt setup is more efficient, though it will get more hot.
His point is simple Zero;
a motor delivers 50Ncm of torque at 2000Kv;
a motor that does 25Ncm at 4000Kv would have the same power.
Again; i used an 8XL on my 6Kg heavy savage without ANY heat issues on 16 cells, it's beyond the power a hvmaxx is ever capable of..
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Maybe we should do some tests before we keep arguing. Those numbers are purely speculation. I realize that the higher power system will create more heat even if its more efficient, but where did you come up with those numbers? I think the HV motors actually have 14.5 x 45 mm rotors while the feigaos have 19 x 45 mm rotors. Thats about 1.31 times the magnetic surface area and 1.31 times the leverage, so the 8xl should have about 1.72 times the physically possible force as the novak. An 8xl on 4s spins at 31000 rpm. The novak motor only needs to spin at 31000 x 1.72 = 53000 rpm to have the same power and the novaks seem to be able to handle 50-60k+ rpm just fine. So both motors are physically capable of the same amount of power without the rpms getting too high. Motor resistance is a totally different factor, it is that that determines how many amps the motor will draw and how powerful it is, not the size of the motor. It could certainly be possible to design really small motor with a big heatsink that can spin safely at 200,000 rpm and be more powerful and more efficient than an 8xl.