Some very interesting conclusions in this video. He seems to be valuing some specs which never really get mentioned in esk8, i.e. weight, and surface area.
I guess it makes sense that weight would be a decent shorthand for overall power output, assuming that you’re comparing motors with similar construction. Maybe we should be comparing stator weight only.
Generally the diameters ability to grow on our motors isn’t super vast. Hub motors is a good example, from a performance perspective hubmotors start to make alot more sense once they grow to bike size appilcations.
I think the OP is a bit misleading. the answer is technically “yes” but bigger motors don’t provide more power. bigger motors enable more power to be applied to them.
other motor specs like winding thickness change how that power is translated onto rotational energy
If you have 2 motors of the same kv, and one of them is bigger and has lower resistance, and you set a battery current limit but no motor current limit, then during full throttle acceleration the bigger motor will accelerate faster, because it will receive more motor current for the same battery current on account of the lower resistance. both have the same torque per motor amp, but the bigger motor gets more motor amps for the same number of battery amps.
another way to think of it is for the same number of motor amps and torque, the bigger motor generates less heat because its electrical resistance is lower. consequently because the bigger motor produces less heat for the same motor current and torque, the bigger motor draws less battery amps for the same torque at the same speed, because it takes less battery amps to produce less heat, which increases range.
suppose you rode both motors at the same constant speed with the same torque and motor amps, then the bigger motor gets more range because it produced less heat for the same performance and it was drawing less battery amps.
The bigger motor will have better range if you’re running the same motor current or the bigger motor will have more torque if you’re running the same battery current, because when the resistance changes (switching between bigger or smaller same kv motor), the ratio between motor amps and battery amps at a particular speed changes. When the resistance decreases, supplying the same number of motor amps requires fewer battery amps.
Not always, bigger motors almost always have more core losses, quite a bit more sometimes, so your range will decrease because it will be running at lower efficiency