by Irving » 04 Feb 2016, 17:10
Burgerman wrote:To increase efficiency and allow lighter wiring and smaller motors/controllers most of the serious model helis are using lipo and 10 or 12S now. So are at 40 to 50 volts. As we should be!
Interesting trade-off there for helis/quads between battery weight and motor/wiring weight, can't be one-approach fits all...
The reason I was asking what MOSFETs they use is to think on whether they could be replaced with a newer type with a lower Rds(on) (on resistance) and then tweak the current limit. I would expect that current limiting uses a sense resistor that could be changed. The firmware will most likely measure voltage across the sense resistor and once over the limit will roll-back to a lower voltage for a period of time. Changing the limit by changing the sense resistor will retain the same normal v rollback ratio without needing a firmware change.
C5/6 A (complete)
Puma 40, 75Ah LiFePO4 (pic is on tour @ Whistler, BC)
Puma 40 backup, 73Ah MK (for now)
Spectra Plus (weedy 40Ah MK)