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February 24, 2009
about a year ago
Looks like a nice controller. Industrial products with similar capability cost $100 or more. Hard to believe that people can complain about a $34 price tag.
I have not tried one of these boards but I have purchased three for a new project.
It took me some time to realize that although the Dspin chip has “micro-stepping”, it only stops on full steps. I wish that was clearer on this page.
It is unclear how to initially set the Kval parameters for a particular motor.
This equation is in the data sheet:KVAL = ((KVAL_X + BEMF _COMP)× VSCOMP×K _ THERM)×microstep
I still don’t see how to relate a motors current rating to the KVAL setting!
Seems like the only way is figure the voltage (VOUT = VS ⋅KVAL) and use Ohms law to figure the current based on the winding resistance.
Seems like folks are likely to smoke their motors without knowing a specific way to come up with the right setting.
I’ll make a spreadsheet to come up with the four Kval parameters then try it out on a couple of motors.
Anyone else figured this out?
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