Re: [oopic] Stepper Motor and Driver Setup Issues

What voltage is that motor spec'd at? The data sheet you linked didn't
say. There are a RAFT of things that can go wrong when using steppers.
The first most likely one is that it isn't wired properly. The symptoms
you describe are exactly what you see when they aren't wired correctly.
The easy fix is to swap the wires on one of the windings, if that is the
problem this swap will fix it. The other problem is insufficient
current usually from too low of a voltage.

DLC

turgrid wrote:

>I am working with the OOPic-R board (revision C1.x+) and compiler
>6.1.1. I have wired, I believe correctly, a bipolar stepper motor (<a
>href="http://anaheimautomation.com/manuals/L010174%20-%2017Y%20Series%20Spec%20Sheet.pdf">link</a>)
>to an l298 driver (<a
>href="http://www.solarbotics.com/products/k_cmd/">link</a>).
>
>The behavior I experience was this: Sometimes (w/ regularity) the
>stator of the stepper motor is in-between coils to start with and
>fails to start spinning without some small assistance. To avoid this,
>I was told to reduce the frequency initially and then ramp it up to
>desired speed to "unstick" it.
>
>In attempting to accelerate the stepper motor I have encountered
>several issues (somewhat hard to describe). The motor only appears to
>run at three rates (specified by rate property of oStepper object) -
>123, 124, and 125. This is problem #1. Why does the stepper run at
>so few frequencies? When I write a program to ramp up the rate
>property (via simple loop), I run into one of two issues. 1) The
>whole ramping has no effect and sometimes the motor starts, while
>other times it needs a little boost; 2) As far as I can tell the
>program gets stuck at one of the initial rates specified (of which the
>motor will only vibrate on) and continues to restart and continue
>looping. I am unable to discern this weird program flow and why it
>sometimes starts thrashing.
>
>This bizarre program flow has really stumped me. When it gets in one
>of its moods, I am unable to send programs to it, the oopic appears to
>lock up and/or restart and keep looping. Further, if I tell the
>stepper to go x number of steps the program loops and stutters
>in-between iterations. Why such unwanted behavior?
>
>Any thoughts, suggestions, or clarification questions would be greatly
>appreciated. If you need code, let me know...I played with it so much
>I will have to find something to post. Thanks in advance.
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>

--
------------------------------------------------------
Dennis Clark ooPIC Tech Support
www.oopic.com
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