> Ideally you want a motor which gives good low range torque (high number of
> turns) and a motor which gives you a high speed (low number of turns). From
> pratting around for years with two motors, i would recommend you go for a 19
> turn and a 10 turn. You'll have to experiment wit hte gearing because I
> don't have the specified machine.
Now this is something I certainly would not recommend:) Using Dual
motors they should both be the same, otherwise they would be fighting
each other instead of moving the car.
> I would also recommend you wire the motors in parallel and not series, for a
> number of reasons namely, power is proportionaly to current sqaured, you
> want to cause as little power loss int he wires as possible thus you should
> wire in parallel.
The suggestion is correct, the reasoning not. The reason you should wire
the motors in parallel is that this way they both always get the same
amount of voltage, so they are always able to give out max power, no
matter what the other motor does. I try to explain:
Imagine dual motor monster with motors wired in series, crawling over a
rock, which gets stuck below front end, so that both (or at least one)
front wheels are in the air. This makes the load on front motor quite
small, which causes only small current flow through the front motor
(less load=bigger internal resistance=less current). If the motors are
wired in series, that means both motors have the same current passing
through (since thay are the same current circuit). The load on the rear
motor is much higher, internal resistance smaller, leaving only small
amount of voltage to the rear motor, which in turn means no power. Can
we say stuck?
With parallel wired motors this won't happen. Both motors always have
the same voltage, the front motor will just spin a lot faster due to
less load, but the rear motor is still able to move the thing.
> as for the voltage, higher is better.
Mostly yes, especially when added weight is not a big issue.