[TomH]

If efficiency was the only factor in choosing equipment - life would be so much simpler.

But more expensive.

 

[TomH]

exterior rotor (outrunner) motors have higher torque density and efficiency compared to interior rotor (inrunner) motors...

Exterior vs. interior rotors in robotic brushless motors | Request PDF

Request PDF | Exterior vs. interior rotors in robotic brushless motors | Many robotic actuators must generate high torques and accelerations. Exterior-rotor brushless motors seem better suited for these tasks than... | Find, read and cite all the research you need on ResearchGate

www.researchgate.net

View attachment 139089

So, as the man says, they are better at powering robots.

Not much relevance to EVs there.