I can't beleive it is so hard to get two identical speed
I wanted to get two ESC's for a firefighting robot I am
trying to build.
So I ordered two ESC's from a nice supplier. They both
arrived, except one
was DOA. So I sent that one back to the manufacturer for
repair/replacement (that's what the instructions say to
do). So they send me
a even better one that the one I sent them (heck what do
you do?, they did
really good on the warranty DOA). Big difference too, a 140
amp (.012 ohm)
ESC replaced with a 162 amp ESC (.004 ohm). Doesn't exactly
allow for a
robot to track straight.
Anyway, I order another 140 amp ESC from the supplier and
send me the wrong one a 65amp one. I ordered two of a
different model ESC
from a different dealer, and I wind up with them
accidentally only shipping
one instead of two.
I've called them all and they are all correcting the orders
and sending the
stuff out. So everyone is bending over backwards to correct
But it's just the bad karma of it all. Jeeshhh. Only four
weeks trying to
get two matching ESC's.
Besides all the time lost waiting. I have to sort of squish
the robot and build up on top of that in the robot, so
there isn't a lot of
room to go trying to disassemble everything.
I should have known better and just built the stupid things
myself. But I
haven't been able to get the 140-160 amp motor controllers
that small yet.
Mine are too big.
But before anyone says anything. A set of motors needs
maybe 20 amps max to
work. But a 140 amp motor controller doesn't need neat
sinks as the
transistors have such low on resistance (PWMing them) that
they don't even
get warm. Thus you can cram them into a small, tight, low
to little air
circulation place, and they don't get hot.
Definitely going to be hard to build a firefighting robot
at this rate.
Maybe for next year's firefighting contest, I'll be ready.
Don't know about