Re: faster steppers

Henrik, Ian, list,

How were you using a rate generator to MEASURE the maximum steprate?
Just by feeding the driver with a square wave? I've been trying to use
a Frequency counter designed for Amateur Radio (StarCraft?). Works part
of the time, but I suspect that the pulses (20us) may be too short for
higher speeds. I can read the frequency relatively well with an Interro
"lab scope" made for automotive testing ;>) I've also read pulse
repetitions with a 100mhz HP 'scope.

Actually, as we have a good digital signal, one should be able to count
the frequency with a program running on the PC, and using the parallel
port as an input.

You will need proper acceleration/deceleration ramps to get the maximum
speeds. AND high P.S. to coil voltage ratios (for full current) for
good "chopping".

> >I'm using steppers w/ about the same data as you driven by my
> >homebuilt drivers at 36V.
> >I can go as fast as Master5 can spit out pulses (8192 pps). Thats
> >about 1200RPM. I have tried to measure the maximum steprate with a
> >function generator but I run out of travel before the motors stall.
> >
> >You should be able to get more than 210 RPM. Maby your ways are to
> >tight?
> >What are you using as powersupply?
> >Henrik Olsson.