Which hack?Mesuge wrote: Did anybody (apart from Kermit's experiments) perform this hack on any (smaller output) VFD and motor combo? Will the efficiency map for this emotor plotted against RPM remain essentially the same or there might be 1-2x efficiency gaps? Improved forced air cooling, water cooling, heatpipes, peltier, ...
240V motor with 415V controller - I think Johny is in the best position to do this (he has a small motor for playing with which I assume is 415 star / 240 delta) But he has no load...
As for dyno-ing: acmotor has the only road-registered industrial AC EV in Australia that I know of a4x4kiwi is getting really close.
I suspect the efficiency may go down a bit switching from 415V to 240V, the I^2R will be higher, I'm not sure how much of the (in)efficiency is due to those though, R is pretty damn small.
I think overstating the V/F ratio will get more performance with more heat (magnetic losses) and less efficiency. The difference between 75% load efficiency and 100% load efficiency isn't that huge (<1%).
The losses from memory come from:
I^2R motor cable
I think the fan would be significant, especially at higher speeds.
I am a fan of acmotor's computer fan mod