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Topic: Which Motor Drive should I choose for a small drone (Read 158 times) previous topic - next topic

Mcluky

Hello^^, I'm thinking about building my own small drone with an esp8266. It should only be a small drone. The motors will each draw around max 9 watt (6-7v/1,5a locked). I haven't yet chosen which motor exactly, but it will certainly be not very big. I'm sure that I'll need a motor drive of some sort and I have been searching for a solution. Until now I came up with 2 solutions... Either use a MOSFET or a DRV88xx.

I'm new to this hobby and I'd be happy if someone could explain me the differences. I know that most DRV88xx are H bridges and made for 2 dc motors to spin in both directions but I only need the fans to spin in one direction. Can I just hook up 4 fans instead of using them as a H bridge? I know also that I need a "N-Channel" - MOSFET but to be honest, I don't really understand what this means and how I know which ones have such a channel.

So in conclusion, can you please help me? Which MOSFET or DRV88xx should I use? Or is there something else I should consider? Could you also make an example which part exactly I could order? You would help me a lot.

jremington

#1
Jul 11, 2018, 02:58 am Last Edit: Jul 11, 2018, 02:58 am by jremington
It is easiest to use a logic level MOSFET. One would handle all four motors. Wire as shown below.


Mcluky

Could you please send me a link to an example part? I'm sorry but I don't understand how one of these are supposed to handel all 4 motors.

slipstick

Given the way a drone is normally controlled by the flight controller changing the speed of individual motors then you need a MOSFET for each motor. There are hundreds of suitable MOSFETs e.g.  https://www.mouser.co.uk/datasheet/2/196/irlml6344pbf-1228041.pdf or https://www.mouser.co.uk/datasheet/2/115/ds31962-1365534.pdf

But I guess the question is what you want your drone to do and how exactly you intend to control it.

Steve

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