RE: [CAD_CAM_EDM_DRO] DOUBTS WITH STEPPERS MOTORS VELOCITY/PERFOMANCE

I'd suggest that you download the demo copy of MACH2 or MACH3 and play with
the motor tuning section. I can make my 2000 micro step per rev Size23
motors run at 25kHz with both MACH2 and my ELS.

What I've read about steppers and the dynamics of the motors is that
anything more than about 8 to 10 micro steps per step is largely ineffective
for getting rid of any other harmonics or oscillations. It's one of those,
just because you can doesn't mean you should.

If your drive is set to do 25600 steps per rev and the output from the PC is
25kHz you will see one rev per second or 60 RPM which is pretty slow.

Another point (I have scope pictures around somewhere) is that if the motors
you are using have a fairly high inductance you may also find the maximum
speed limited with only 48 Volts. I have some older surplus motors that I
initially played with and at higher stepping rates the current never even
came close to maximum due to the inductance.

John Dammeyer



Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Marcos
> Leandro gonzalez Brughetti
> Sent: Thursday, March 16, 2006 7:33 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] DOUBTS WITH STEPPERS MOTORS
> VELOCITY/PERFOMANCE
>
>
> HI ANYONE!!I hoked up two "leadshine" microstep drivers, pretty
> nice, up to 25600 steps/rev. up to 5.6Amp.
> running on a celeron 300mhz, 64mb ram, booting straight DOS, then
> runing TCNC,
> my configuration of motor is :
> max speed 4500Hz
> accel 1000hz
> slow jog 2500hz
> fast 4500hz
>
> when i try to give more speed, the motor speed ups and stalls.
> if i try more acceleration, the motor stalls too.
>
> a few days ago , i couldnt run this motors with more than 2500hz,
> but reading some post on this group, i realize it could be my Pc. so
> i reboot,go to bios setup, disable USB support, and everything i
> didnt need...and then i could get my steppers to go up to 4500hz,
> ALMOST DOUBLE THE SPEED! so now im wondering,....
>
> whats the max speed should one expect with a stepper motor? (in HZ)
> THIS IS MY FIRST EXPERIENCE ; also is good to mention that my
> microsteping controllers are setted at 3600 steps/rev. my steppers
> works REAL SMOOTH . PRETTY NICE!
>
> i have to try if i decrease the steps/rev to like 1800steps/rev ,or
> even 900 steps/rev will i get more processor power at my PC,
> (because i will need less steps to make my steppers run )
> and then be able to get more HZ at the motor runing....
>
> about my stepper motor, they are MAE really old (about 1986 )
> double shaft, 190oz/in, NEMA 34. dont know if they are exactly that
> specs, someone in this group pointed me at a site page, with a
> similar looking stepper motor made by MAE, so i guess it should be
> similar specs too (real dumb deduction too)
> idont know the working voltage, but im using them at 48V.
>
> ANY IDEAS??????
> THANKS
>
> MARCOS
>
>
>
>
>
>
>
>
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