Does anyone have some more data on the small steppers on the micro?

It only says 0.5amps. But what is the maximum voltage, and what is the inductance?

The motors' V can be driven up to the dielectric breakdown, which I believe is 500v; though you'd have to take away the copious heat. V and speed are directly proportional; the higher the V the faster it goes. We've tested the motors and found a realistic upper limit of 40v or so; but the heat will crank. We use active fansinks on V1.2 which keeps the motors at <110f. On V1.1 at 24v you can use passive or active. I can supply the sinks if anyone needs them. The other variables I will have to dig up; I think I still have a datasheet somewhere.

I run with my Gecko G540 (had it lying around for my next project), and even after a whole day of running the motors don't get past 95F. I have bought heatsinks but I don't need them...

I am currently running 24 volts, but I have a 48 volt supply as well. Does this give more torque?

The Gecko may be using idle current reduction, but you are saying the motor doesn't get hot when stalled? When running, the motors always stay cool...

FYI: The drivers we supply top out at 40v.

48v would not give more torque per se, as that is the function of power, in this case the amp rating of the PS. 48v would give a lot more speed though.

A stepper will make heat two main ways. One is coil heating the other is from leakage current in the magnet structure.

The Gecko has idle current reduction and speed active PWM current limiting both really will help to keep the motor cool. The inductance of the coils will allow for less current at high speeds and it allows the PWM to work at lower speeds but the magnet structure losses are constant and un-affected by the PWM current limiting.

This will cause over heating even with a PWM driver thus limiting the amount of voltage you can drive the stepper with.

From what I have seen a little higher voltage and the Gecko drives would be a good thing.

Could i change the "current setting resistors" on the Gecko to a higher number than 0.5amps? Lets say 0.7 amps? This will give more torque?

At the expense of heat and possibly the motor...and the current configuration will torque the couplers in half...

What are being used for the new stepper motor drivers on the micRo? Did LL do them up themselves, or are they a product from somewhere? I can't find anything that looks similar on the net. I'm interested in what chip you guys are using. (As long as it's not a trade secret or something!)