Myxa Field weakening

Support Telega electric propulsion
1

Hello guys !

I’m using the Myxa 0B with telega v0.2 for a quad copter UAV.
I’m very please with the ESC controler and its small SWAP.

I’m using a lithium-ion battery (full charge: 25.2V - empty: 18V) and due to it’s low empty voltage (compare to a classic lipo : empty voltage ~20.5V) the motor can’t deliver the require rotation speed I need when the battery is 2/3 deplete.
I would like to use that remaining third but to keep control of the UAV the motor need to be able to reach a maximum speed of 5400RPM. From my test I can reach that maximum rotation speed with an input voltage of 21V (Motor KV = 487).

To reach 5400 RPM at 18V, would it be possible to use the field weakening function ? Is it recommendable for a multi-copter ?
How can I use it correctly ? It look like it required some attention (Max current/watts power data sheet discrepancy - #7 by Magnus)

From this post Voltage Utilisation Factor telega v0.3 has a better maximum phase value (amazing news !), so updating the firmware would improve this problem ?

Thank you for your answer.

2

Hi Hadrien,

The field weakening can be used for a short-term significant increase in thrust during extreme maneuvers. However, it is not recommended using this mode unless absolutely necessary, as it greatly decreases energy efficiency. It is better to take a motor with a high KV value.
In your case, I would recommend trying the new v0.3 firmware first. The speed range should increase by about 10%. It depends of course on the propeller and the amount of load on the motor.

3

Thank you Dmitry for the answer, I’ll try the new v0.3 firmware first and change the propulsion if required.