Angelos
Key Veteran
Location: nr Oxford, OX11, UK
My Posts This: Topic Forum | ELOSSAM,
This looks like an interesting device. I wish I could understand the all the details, as the computer translation doesn’t always makes sense.
Anyway… it is easy to measure small currents. The problem is measuring the current of the motor of an electric heli. Imagine something the size of a Logo20 or a Joker.
The typical way to measure current is by measuring the voltage drop across a very small value resistor in the order of 0.05 Ohm.
I don’t know the exact figures for the motor of a Joker but I know the Joker is similar to a 60 size heli thus will have at least 2HP motors. If I remember right this translates to 1472Watts. With a 35 Volt pack this requires 42 Amps.
This current passing through the 0.05 0hm resistor generates 88Watts of heat and cause 2.1V voltage drop. NOT GOOD!
Of course I could put an even smaller resistor there to reduce the heat loses and voltage drop but the problem still remains is a smaller factor. This is why I said I want a passive way to measure it. I have no idea for how could this be done but there must be a way.
I built a prototype video overlay today and it works  I can now play with around and try to interface various sensors like barometric altimeter, GPS, voltages etc. Anyone has ideas about other useful reading to add on the screen?
Cheers,
Angelos |
