Propeller and ESC?

soshimo

I'm bored with my BJT H-bridge experiment and I'm also a little concerned that without an interface chip errant signals from the uproc (usually caused by bad programming) could cause shorting conditions in the hbridge. I was about to buy a 1A motor driver chip but then started thinking bigger. What if I wanted something a bit larger than lunch pail size? What if I wanted something that can go 45mph flat out? I'm not going to get that with 1A. I've got some RC stuff in the old junk box from years gone by and I've got a few 25A ESC's. One with reverse - the others are for aircraft so no reverse. I was thinking of leveraging them somehow with the prop driving them. Is there anything to be aware of with these? Do I need to worry about flyback or does the ESC protect from that? Is it just a standard PWM signal that I can use to drive it?

TIA

Timmoore

I just use a standard servo control signal for escs, there are lots of objects for the prop that can generate that. The escs I use a brushless 18A and I have had no problems.

soshimo

Timmoore said...
I just use a standard servo control signal for escs, there are lots of objects for the prop that can generate that. The escs I use a brushless 18A and I have had no problems.

Yeah, all the ones I have are from back when a novak brushless system was about 500 bucks and only for serious racers. Since I was a backyard basher I could never justify the cost. Now they (brushless systems) are pretty much standard fair for aircraft (fixed wing and rotor). I don't do ground RC anymore so I'm not so sure about that.

Good to know about the servo control signal. I'll grab an object off obex and start experimenting. Thanks!

Timmoore

I use a modification of this one http://obex.parallax.com/objects/467/·.

Cluso99

I placed one on the obex that drives an esc by using the attached pc and its keyboard (with PST) just to test the esc and brushless motor. It was a version based on another object. BTW It is very simple to drive an esc!!! This route makes good sense.

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