Peter wrote: > > > Jon, > > It doesn't "switch" from 1/10 to full-step, it "morphs". It's not done > with clocks and dividers, its done more in the analog side. That's the > difference that Mariss adds. Anyone can built a microstepping drive. There > are scores of application notes and open source designs. To do what > Geckodrive does requires a bit of lateral thinking, and not just copy what > is all ready out there. > Oh, I agree, when it comes to thinking outside the box and simplifying what everybody else does the complicated way, Mariss is quite amazing! > As to the advantage of fullstepping over micro-stepping, a full stepping > gtive will provide more torque at higher speed. The reason that you run > steppers at a voltage of up to 20 times the plated voltage is to get rapid > current changes in the coils when they are reversed, allowing for higher > speeds. When micro-stepping, the voltage changes are small. > It just seems to me that when the motor inductance causes the winding current to lag behind the current command from the microstep sine wave, the current control logic will automatically become the same as a full-step drive, with no special function at all required. But, I admit, I have not extracted the schematic of the drive to figure out if there is anything extra there.
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