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Thread: Jerky Microstepping
www.piclist.com/techref/index.htm?key=jerky+microstepping
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face BY : Lawrence Lile email (remove spam text)



Morgan wrote:

>There must be one Vref signal separately for each phase, right?
>Is there?


Yes there is.  I am using two TEA3718 chips, and two PWM outputs on a PIC
876 to control the Vref's.

I wrote a routine that just proceeds one microstep at a time, and verified
that the Vref really was zero.  As soon as I flip the PHASE bit on the
TEA3718, the motor jumps about 1/3 step.  At medium or high speeds, this is
not noticeable, but as very slow speeds it is jerky.  The stepper runs a
camera, so you get this jerky, out-of-focus movement at slow speeds.



I am using microsteps as small as 1/100th step (overkill, really)



-----Original Message-----
From: Morgan Olsson <spamBeGonemorgans.rtRemoveMEspamspamtelia.com>
To: Lawrence Lile <spam_OUTlilelspamtoastmaster.com>
Date: Tuesday, October 12, 1999 2:58 AM
Subject: Re: Jerky Microstepping


There must be one Vref signal separately for each phase, right?
Is there?

/Morgan
Morgans Reglerteknik, Hllek s, 277 35 KIVIK, SWEDEN
  tel +46(0)414-446620, fax -70331,   .....mrt.....spamSTOPspaminame.com

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