Lawrence Lile email (remove spam text)
>There must be one Vref signal separately for each phase, right?
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)
From: Morgan Olsson <telia.com> morgans.rt
To: Lawrence Lile <toastmaster.com> lilel
Date: Tuesday, October 12, 1999 2:58 AM
Subject: Re: Jerky Microstepping
There must be one Vref signal separately for each phase, right?
Morgans Reglerteknik, Hllek s, 277 35 KIVIK, SWEDEN
tel +46(0)414-446620, fax -70331, iname.commrt
See also: www.piclist.com/techref/index.htm?key=jerky+microstepping
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