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PICList Thread
'[OT]: microstep generation [was: Competitions..]'
2001\04\09@080612 by Vasile Surducan

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Interesting, Roman !
You goes at high revolution if you have used PWM curent controlled
coil supply ?
But how you generate the microsteps ? There is a site with this theory ?
I'm not thinking at full step and half step theory which is simple but to
real microstep applied to bipolar steppers too.
Vasile



On Mon, 9 Apr 2001, Roman Black wrote:

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2001\04\09@115410 by Roman Black

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Vasile Surducan wrote:
>
> Interesting, Roman !
> You goes at high revolution if you have used PWM curent controlled
> coil supply ?
> But how you generate the microsteps ? There is a site with this theory ?
> I'm not thinking at full step and half step theory which is simple but to
> real microstep applied to bipolar steppers too.
> Vasile


Hi Vasile, yes high rpms no problem, I got 0rpm to
1800rpm (30 rps) in less than a second, and with an old
high-inductance motor that is not good for high speeds.
Linear ustep drivers are great for performance, even
though some people like choppers.

The 16F84 drives two PWM outputs, these are filtered
to analogue dc, which controls a constant-current power
transistor for each coil. So you can vary the current for
each coil to give proper microsteps. Mine has 8 usteps.
The PIC also has 4 other outputs that control which
windings are on. So a 200 step/rev motor gets 1600 proper
microsteps/rev.

The pwm is VERY fast, over 90kHz with a 16MHz crystal.
So it is smooth and allows very fast change from one
microstep to the next.

16F84 is the "brain", also needs the power transistors
and a good heatsink for the constant current linear
transistors. Can wire it as bipolar or unipolar.
-Roman

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