The high speed 3 phase motors I first in early 2000's could sooner for model .
They could build a very light weight motors turning at upto 20,000 rpm's. Now we see as a brushless motors turn at 4,000 to 6,000 rpm's keep the cost of motors down.
This could be sooner too I just looking that hard in that year.? I only used time proven AC motors at high cost motors.??
Dave
davesmith1800