I am not an engineer, and neither familiar with motors, so bear with me. :) Thorough explanations needed. :)
The question is, why brushless DC motors intended for RC models and possibly paragliders rarely use high input voltage but rather high currents (and losing power to heat)? For instance, a motor consuming 144W would usually take 14,4V and 10A rather than 144V and 1A.
As I understand, raising voltage is more effective way to gain power for a motor than raising current (to a certain extent). I guess 300-400V is a more or less effective range. But there must be a caveat in this. Is it cost for battery/controller or something else?
If one is building a custom solution and not as limited in terms of costs, what would be the most effective way of transferring power from a battery to a shaft (with least losses) - raising current or raising voltage? Why?