Hi Guys .
I found this video. and I was wondering isnt there any use in adding hall sensors to the motors on your copter to give feedback to the controller of how fast each motor is spinning ? this would make fualt finding on underperforming motors very easy , and be good feedback source into the system for automatic corrections and even thrust calculations.
Replies
Doesn't really tell you how fast it is spinning. Tells you how much current it is drawing, within a tolerance. This tells you how hard the motor is working to spin, not neccessarily how fast the spin is. Can still be useful, but for larger differential rather than small ones. My experience with hall effect is that they are a bit fickle and can be difficult to calibrate to give numbers you can trust. then what do you conclude with the numbers?
I used to work with high powered communications that used DC voltage and some high currents. We used to buy high power .01 ohm resistors that this guy built out of his garage. Then we would just stick them in series with the line voltage and measure the Vdrop. Very accurate. I think they can be hard to find but it has been many years since I did that, so I am not sure.