What makes high end motors efficient?

[DrKnow65]

What is it about a neu/lehner/hacker type high end brushless motor that makes it more efficient than a cheaper motor? Simply more poles? Better winding technique? Tighter tolerances? Better magnets?

Where's the physics guru... I want some knowledge.

[bdebde]

I think it is a little of all those things!

[Arct1k]

Better copper reduces losses, better magets greater field strength, better bearings less friction, tighter tolerance - less field gap etc etc

[lincpimp]

Front what I have seen, the magnet design, quality and construction seem to be the biggest difference. I am sure that the windings are better, both in material and layout in a higher quality motor.

[aqwut]

Geez!!.. it's the Price!!.. the more you pay, the more efficient it is.. if you paid $300 for a Feigao 540 XL, it would be just as efficient.!! J/K

No really, I do agree with Art1ck... but I didn't think hackers where that efficient... (I've never owned one, so I'm not sure).

My hacker c40 8s is probably the best made motor i have ever seen.

It does not have a segmented rotor but in my opinion its still superior to the kontronik twist in many ways.

The most important being that its rebuildable, the casing has the most effective cooling fins on any motor i have ever had, and it uses oversized bearings and shafts unlike the kontronik and the plett extreme which use 1/8th shafts.

I have a kontronik twist, plettenberg extreme and a hacker c40 and from running the same setup the plettenberg seemed to be more efficient when driving with partial throttle but then being 4 pole should make it more efficient under a varying of loads.

Someone mentioned that the hacker c50 motors had segmented rotors in which case that would make them even more efficient and a good 2 pole motor for 1/8th conversions in my opinion.

The problem i always find with feigao motors is that due to there lack of efficiency on long bashing sessions they keep getting hotter and hotter. This has often made me wonder if they are using a copper that's resistance if more sensitive to heat.

But then again is could just be that the motor is probably like only 80% efficient and 20% of 500watts is 100watts and anyone who has a modern quad core cpu knows how hard dissipating that kind of heat is.

I did also notice that feigao windings are also nowhere near as precise which surely affects the accuracy of the magnetic field produced. Saying that the mamba motors have awful looking windings which look like they had just been wound up and shoved in there.

By yeah who does make the best ceramic bearings for motors?

[johnrobholmes]

Stator lamination thickness (or lack of) makes a pretty big difference too, as well as copper cross section. Air gap and material quality go a long way too.