I'm trying to make a remote control helium blimp using an arduino nano.
The plan is for it to have two motors for forward/back, and one for up/down.
As these need to be reversible, I've been looking at making my own H-bridge, but am stuck on component selection. How might I go about selecting the most suitable transistor, and how do I calculate what resistors are needed?
Any help would be greatly appreciated. Did electronics in college far to long ago, and I feel like i knew this... once.
By small coreless motor you mean the ones about 15 to 20mm long? If so assume a load current upto 2A and
supply voltage of 3.7V (they are all made for single cell LiPo operation I think)
This requires MOSFET H-bridge with very low gate voltages - perhaps a pair of SMT p/n dual MOSFETs?
Note that these motors are highly liable to be biased (the commutator is offset for a preferred
rotation direction for better efficiency at very high speeds). This means the reverse max speed will be
less than the forward - watch out for that.
Yes that's the ones. Ok that's super helpful thank you, I thought MOSFETs were better suited to higher voltage applications, and was looking at BJT transistors as a potentially lighter weight solution.
Did not know that about these motors. Good to know but shouldn't be too much of an issue.