Cool question. Assuming the motors all have the same amount of wire inside they will produce the same ratio of heat in the windings to torque and said to be the same km. ur better with the biggest gear u can fit and highest kv, Infinitely so except there’s both the gearing losses, which need not be much if it’s an efficient gearing, but more so the limit there are the iron losses(hysteresis and eddy currents) which rise with increased electrical frequency.
. The point at which a bigger gear would be less efficient depends on how the motors are used but the common 3:1 ratio results in much more copper losses than iron and a bigger gear would be an advantage.
Most efficient would be a gear so big that the iron and copper losses are about equal.
if all the motors have the same size constant (km), then the highest kv motor that is geared for the same top speed will be most efficient for the same acceleration or constant speed.
@murdomeek i should add that above a certain kv, the motor will be spinning so fast that iron losses will become so significant that the logic of higher kv for more efficiency only extends up to a certain point. and iron losses are hard to estimate but with high enough kv they will exceed the resistance losses.
The KV possible for this motors because the position of outgoing wire is fixed position, can’t just wind half circle wire is limited. It Can be ~100, 140, 180, 210, 250.
Needs 260 Hanger for them to fit, and on some gearings need 275mm hanger.
Also made a special cnc made baseplate to prevent motor hit them if using 260mm hanger:
