Need to design and build 250W BLDC inverters for drones

[Flyback]

Hi,
We wish to build drones capable of carrying up to say 5kG. Therefore we need four 3 phase BLDC inverters capable
of 250W each.
We must build the inverters ourselves, and not import them in from outside Europe/USA/Australia/UK.
There are very few companys in EU/USA/Australia/UK that build drone inverters, so we need to do this ourselves.

Please offer us any help you can.

The inverter bit looks simple....just a bridge of four suitably heatsunk MOSFETs.

Do you know of inverter control chips for this, or chipsets?
What battery voltage would be best would you think? (we believe 48V is best, with matched series/parallel cells and "stop_when_any_is_full_or_empty"
charging regime.)
they will have 4 propellers, so we need four 250W inverters.
So thats 6 Amps from each battery.

Do you think a microcotnroller would be best to provide the Inverter MOSFETs gate drive
signals?
So we need it to receive the four rotor position sensors, and then push out the drive signals
, and have the four speed inputs.

Please help with this?

 

[Flyback]

Thanks, this video (build a drone with Arduino) appears to be whats wanted...

....the idea is to build it like this...but replace the so-called "ESC" with our own 3 phase inverter.
Part 6 shows the inverter.

____---
.it looks like pretty much all the design is done in the vids shown here.
We just need to replace the Inverter with our own....should be easy...then from that point, we can learn how to do the programming aspect of controlling the BLDC inverter from the
pitch and yaw and speed demand values that the flight controller kicks out to us. (ie ultimately we will make our own flight controller, but not yet)
We also need to be able to scale up to drones of a higher power level......presumably thats easy, as the flight controller always first gets connected to the motor and "calibrates" to its characteristics....so it looks like the flight controller will adapt to a drone of any power level.

The code for the flight controller all appears to be dished out to us from the arduino web site. (or the video shown).

So , quite literally, all software is written in the Arduino video, and all that needs to be done, is shovel in our own motors and inverters...the Flight controller will give us the gate drive signals for the inverter FETs...and we simply need to manipulate them to drive the actual FETs via suitable gate drivers.
Would you agree?

 

[Papabravo]

Thanks, this video (build a drone with Arduino) appears to be whats wanted...

....the idea is to build it like this...but replace the so-called "ESC" with our own 3 phase inverter.
Part 6 shows the inverter.

____---
.it looks like pretty much all the design is done in the vids shown here.
We just need to replace the Inverter with our own....should be easy...then from that point, we can learn how to do the programming aspect of controlling the BLDC inverter from the
pitch and yaw and speed demand values that the flight controller kicks out to us. (ie ultimately we will make our own flight controller, but not yet)
We also need to be able to scale up to drones of a higher power level......presumably thats easy, as the flight controller always first gets connected to the motor and "calibrates" to its characteristics....so it looks like the flight controller will adapt to a drone of any power level.

The code for the flight controller all appears to be dished out to us from the arduino web site. (or the video shown).

So , quite literally, all software is written in the Arduino video, and all that needs to be done, is shovel in our own motors and inverters...the Flight controller will give us the gate drive signals for the inverter FETs...and we simply need to manipulate them to drive the actual FETs via suitable gate drivers.
Would you agree?

No, I do not agree. I think your proposal is way more complicated than you imagine. I don't think you have a clue about what you are up against. Especially since each drone will REQUIRE four(4) working models just for testing and each time there is a hiccup you're going to suffer damage. It does not seem like you even have a viable design yet. Is that correct?