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.
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