Ok, maybe I should go directly to Nema 23 Servos, any recomendations for
affordable units?
Or actually I could adapt a different size too if that be found more
appropriate!
On Tue, Aug 9, 2011 at 10:53 AM, Peter C. Wallace <p...@mesanet.com> wrote:
> On Tue, 9 Aug 2011, Tobias Gogolin wrote:
>
> > Date: Tue, 9 Aug 2011 10:33:10 -0700
> > From: Tobias Gogolin <usert...@gmail.com>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > <emc-users@lists.sourceforge.net>
> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net
> >
> > Subject: Re: [Emc-users] Questions about your Stepper kit
> >
> > I don't like to believe that that is the best 'servo' conversion one
> could
> > make adding a readout, one that would try faster pulses and lock...
> > So if I can work with these motors, who can recommend a good high voltage
> > power supply and microstepping driver for these?
> >
> > Nobody has ever implemented a closed loop stepper controller in EMC?
> >
> > Thanks guys!
>
>
> There are closed loop stepper systems implemented in EMC by using the
> stepgen
> in velocity mode and feedback from rotary or linear encoders. These are not
> fully closed loop in the sense that if the step motor loses position,
> re-homing is usually needed.
>
> For full closed loop (no possibility of losing steps), the controller (EMC
> or
> external step drive) must track the step motor rotor position fast enough
> that at the highest stepping rates, the control is never more than say 30
> electrical degrees delayed, this rate is about 24KHz for a normal 50 pole
> stepmotor at 1200 RPM. Running a servo loop at 24 KHz would be pretty tough
> to
> do in EMC.
>
> Note that for decent full close loop, you do not want step/dir drives, but
> rather angle/current drives.
>
> Overall by the time you add the encoders and exotic control you are
> better off with servo motors (that are more efficient and dont lose torque
> as
> quickly at high speeds)
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
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--
Tobias Gogolin
Tel. Movistar (646) 124 32 82
Tel. Telcel (646) 160 58 99
skype: moontogo
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Blog: http://zeitgeistensenada.blogspot.com/
You develop Sustainable Ranch Technology at
http://tech.groups.yahoo.com/group/SURA-TECH
an Open Source Electric Motor/Alternator at
http://groups.yahoo.com/group/Performance_Axial_Flux
and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox
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