Re: stepper vs. servo
Posted by
ballendo
on 2004-02-12 09:03:44 UTC
Ray,
A bit more:
A stepper is just a syncronous motor run using square waves (At the
fullstep resolution). In other words, the square waves are as close
as you can get to a sine wave using only on and off.
When you go to 1/2 step, you add another level of current control,
and the input waveform gets another step, and is a little closer to
the sine wave ideal. As you go up in microsteps, you keep refining
the input waveforms by adding steps/levels towards ideal sine waves.
At some point, you're back running a synchronous motor with sine
waves...
Ballendo
P.S. Our typical steppers will run just fine at 72 rpms, using a
capacitor on one coil, and fed by 60 cycle ac. (infinite
microsteps<G>)
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:
A bit more:
A stepper is just a syncronous motor run using square waves (At the
fullstep resolution). In other words, the square waves are as close
as you can get to a sine wave using only on and off.
When you go to 1/2 step, you add another level of current control,
and the input waveform gets another step, and is a little closer to
the sine wave ideal. As you go up in microsteps, you keep refining
the input waveforms by adding steps/levels towards ideal sine waves.
At some point, you're back running a synchronous motor with sine
waves...
Ballendo
P.S. Our typical steppers will run just fine at 72 rpms, using a
capacitor on one coil, and fed by 60 cycle ac. (infinite
microsteps<G>)
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:
> Has anybody ever designed a micro-stepping driver that outputsthat you
> approximations of sine/cos to two adjacent coils. I understand
> develop max torque at any rpm, up to the max (which is higher thanthe
> square-wave input). Is this true? How much would it take todevelop,
> assuming no one already has? BTW does anybody know anything aboutDon
> Lancaster's (tenaja.com) Magic Sine Waves, and if they can beapplied to
> this application.are a
>
> RayHex
>
> ----------
> > From: Jon Elson <elson@p...>
> >
> > Given the Gecko 320 as the driver for the servos, I think there
> > couple of significant advantages over steppers. First, theservos are
> > usually capable of a greater speed range, while steppers rapidlylose
> > torque at higher speeds. With servos, you rarely have to worryabout
> > resonance issues. You don't say whether you will use belts, rackand
> pinionprovide
> > or leadscrews to drive this machine, but the servo will likely
> > smoother motion, and be less perturbed by some backlash in themechanics.
> > Steppers can go wild when rack and pinion drive is used, andrattle the
> > gearsdrive, you
> > something awful. Finally, if you lose a step with a stepper
> > won't know it until you measure the finished part. With thegecko 320,
> > it won't allow small errors to build up, and will fault if thedrive
> bindsto stop
> > up or crashes. This can be sensed by the computer and cause it
> > all axes.
> >
> > Jon
Discussion Thread
plastiguy
2004-02-09 18:41:27 UTC
stepper vs. servo
bull2003winkle
2004-02-09 19:49:34 UTC
Re: stepper vs. servo
Jon Elson
2004-02-09 21:24:17 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
ballendo
2004-02-09 21:59:06 UTC
Re: stepper vs. servo
Albee Tang
2004-02-09 21:59:07 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Roy J. Tellason
2004-02-09 22:35:39 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Les Newell
2004-02-10 00:55:07 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
John Johnson
2004-02-10 05:22:09 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
Peter Renolds
2004-02-10 06:01:12 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - H Bridge question
Jon Elson
2004-02-10 07:47:46 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Stan Aarhus
2004-02-10 07:49:36 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
ballendo
2004-02-10 07:50:14 UTC
DIY servo drive? was Re: stepper vs. servo
Jon Elson
2004-02-10 08:02:47 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
bank haam
2004-02-10 09:47:15 UTC
Re: [CAD_CAM_EDM_DRO] DIY servo drive? was Re: stepper vs. servo
Mariss Freimanis
2004-02-10 11:36:49 UTC
DIY servo drive? was Re: stepper vs. servo
dchristal2
2004-02-10 13:32:47 UTC
Re: stepper vs. servo
ballendo
2004-02-10 16:59:46 UTC
Re: stepper vs. servo
ballendo
2004-02-10 17:02:13 UTC
Re: stepper vs. servo
ballendo
2004-02-10 17:03:03 UTC
Re: stepper vs. servo
Roy J. Tellason
2004-02-10 17:51:24 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Jon Elson
2004-02-10 21:23:22 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Roy J. Tellason
2004-02-10 21:42:58 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Tony Jeffree
2004-02-11 02:17:12 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Les Newell
2004-02-11 02:31:50 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Les Newell
2004-02-11 02:43:21 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Raymond Heckert
2004-02-11 19:23:21 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
Robert Campbell
2004-02-11 19:40:12 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
bull2003winkle
2004-02-11 20:35:58 UTC
Re: stepper vs. servo
Jon Elson
2004-02-11 20:51:18 UTC
Re: [CAD_CAM_EDM_DRO] stepper vs. servo
Jon Elson
2004-02-11 21:02:29 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
ballendo
2004-02-12 09:03:44 UTC
Re: stepper vs. servo
ballendo
2004-02-12 09:04:03 UTC
microstepping was Re: stepper vs. servo
Harvey White
2004-02-12 11:44:40 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Chris Cain
2004-02-12 16:44:15 UTC
RE: [CAD_CAM_EDM_DRO] microstepping was Re: stepper vs. servo
JanRwl@A...
2004-02-12 20:42:04 UTC
Re: [CAD_CAM_EDM_DRO] microstepping was Re: stepper vs. servo
ballendo
2004-02-13 06:36:22 UTC
Re: stepper vs. servo
turbulatordude
2004-02-13 07:26:28 UTC
Re: stepper vs. servo
ballendo
2004-02-13 07:51:51 UTC
microstepping was Re: stepper vs. servo
Harvey White
2004-02-13 08:34:30 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Mariss Freimanis
2004-02-13 10:11:40 UTC
Re: stepper vs. servo
Jon Elson
2004-02-13 10:15:17 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Mariss Freimanis
2004-02-13 10:59:38 UTC
Re: stepper vs. servo
Jon Elson
2004-02-13 18:46:24 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
ballendo
2004-02-14 07:46:52 UTC
Re: stepper vs. servo
ballendo
2004-02-14 07:46:53 UTC
Re: stepper vs. servo
Harvey White
2004-02-14 08:43:17 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo
Mariss Freimanis
2004-02-14 12:31:32 UTC
Re: stepper vs. servo
ballendo
2004-02-15 11:45:06 UTC
Chopper methodology was Re: stepper vs. servo
ballendo
2004-02-15 11:45:07 UTC
Stepper Mid band resonance Help! please...
jeffalanp
2004-02-15 12:22:14 UTC
Re: Stepper Mid band resonance Help! please...
Mariss Freimanis
2004-02-15 13:02:29 UTC
Chopper methodology was Re: stepper vs. servo
Mariss Freimanis
2004-02-15 13:22:53 UTC
Re: Stepper Mid band resonance Help! please...
zephyrus@r...
2004-02-15 16:33:25 UTC
Re: Chopper methodology was Re: stepper vs. servo
Mariss Freimanis
2004-02-15 17:05:54 UTC
Chopper methodology was Re: stepper vs. servo
turbulatordude
2004-02-15 22:20:30 UTC
Re: stepper vs. servo - hundreds of microsteps
turbulatordude
2004-02-15 22:40:08 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
Jon Elson
2004-02-16 09:39:54 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - hundreds of microsteps
Mariss Freimanis
2004-02-16 10:48:05 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
ballendo
2004-02-16 10:52:22 UTC
Chopper methodology was Re: stepper vs. servo
jmkasunich
2004-02-16 14:07:51 UTC
Re: Stepper Mid band resonance Help! please...
Mariss Freimanis
2004-02-16 14:22:28 UTC
Re: Stepper Mid band resonance Help! please...
jmkasunich
2004-02-16 14:38:26 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
jmkasunich
2004-02-16 14:41:11 UTC
Re: Stepper Mid band resonance Help! please...
ballendo
2004-02-16 15:25:25 UTC
Re: Stepper Mid band resonance Help! please...
Jon Elson
2004-02-16 22:01:46 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - Allegro and ignoring the edges....
Mariss Freimanis
2004-02-17 07:14:02 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
turbulatordude
2004-02-17 08:09:24 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
Mariss Freimanis
2004-02-17 09:27:33 UTC
Re: stepper vs. servo - Allegro and ignoring the edges....
Jon Elson
2004-02-17 19:28:16 UTC
Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - Allegro and ignoring the edges....