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| Subject: | Re: [geda-user] Stepper Driver Question |
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| References: | <CALSZ9grFdpWEWyU2LFhoDfSYCmXatFohBFyxNGfXdS-SnZ7pBw AT mail DOT gmail DOT com> |
| From: | "P. Taylor" <phil AT plastitar DOT com> |
| Message-ID: | <56BE4EF3.4040209@plastitar.com> |
| Date: | Fri, 12 Feb 2016 16:30:27 -0500 |
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On 2/12/2016 3:36 PM, Rob Butts (r DOT butts2 AT gmail DOT com) [via
geda-user AT delorie DOT com] wrote:
> Please let me know if I should ask this question somewhere else as
> this is the geda forum.
>
> I designed a circuit board to drive a nema 23 stepper motor via On
> Semiconductor's STK682 Motor Driver. The output to the 4 wire bipolar
> stepper is according to spec however, when I connect any of 3 stepper
> motors to the output my tech, in his early 20s, can hear a high pitch
> tone but the motor is not turning.
>
> Extremely frustrated I purchased On Semiconductor's STK682 Stepper
> Driver Evaluation board. I am driving that board with a simple
> microchip processor board. I have the exact same output AND the exact
> same results.
>
> I can't attach the screenshot of the evaluation board io.
>
> Any suggestions?
>
> Thanks
Rob,
The drive for that chip is out of the audio range. You could hear a
subharmonic of that, which would be sensing or drive looping in the
software.
The noise does not mean it's broken, necessarily.
Is the step period / rotational speed set low enough to overcome resting
inertia? For instance if you're sending the motor the codes to run at
500rpm ... that just is not going to happen from a resting state at that
motor size.
Sounds like your hardware might be fine.
Phil
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<div class="moz-cite-prefix">On 2/12/2016 3:36 PM, Rob Butts
(<a class="moz-txt-link-abbreviated" href="mailto:r DOT butts2 AT gmail DOT com">r DOT butts2 AT gmail DOT com</a>) [via <a class="moz-txt-link-abbreviated" href="mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] wrote:<br>
</div>
<blockquote
cite="mid:CALSZ9grFdpWEWyU2LFhoDfSYCmXatFohBFyxNGfXdS-SnZ7pBw AT mail DOT gmail DOT com"
type="cite">
<div dir="ltr"><span style="font-size:12.8px">Please let me know
if I should ask this question somewhere else as this is the
geda forum.</span>
<div style="font-size:12.8px"><br>
</div>
<div style="font-size:12.8px">I designed a circuit board to
drive a nema 23 stepper motor via On Semiconductor's STK682
Motor Driver. The output to the 4 wire bipolar stepper is
according to spec however, when I connect any of 3 stepper
motors to the output my tech, in his early 20s, can hear a
high pitch tone but the motor is not turning.</div>
<div style="font-size:12.8px"><br>
</div>
<div style="font-size:12.8px">Extremely frustrated I purchased
On Semiconductor's STK682 Stepper Driver Evaluation board. I
am driving that board with a simple microchip processor
board. I have the exact same output AND the exact same
results.</div>
<div style="font-size:12.8px"><br>
</div>
<div style="font-size:12.8px">I can't attach the screenshot of
the evaluation board io.</div>
<div style="font-size:12.8px"><br>
</div>
<div style="font-size:12.8px">Any suggestions?</div>
<div style="font-size:12.8px"><br>
</div>
<div style="font-size:12.8px">Thanks</div>
</div>
</blockquote>
<br>
Rob,<br>
<br>
The drive for that chip is out of the audio range. You could hear a
subharmonic of that, which would be sensing or drive looping in the
software.<br>
<br>
The noise does not mean it's broken, necessarily.<br>
<br>
Is the step period / rotational speed set low enough to overcome
resting inertia? For instance if you're sending the motor the codes
to run at 500rpm ... that just is not going to happen from a resting
state at that motor size.<br>
<br>
Sounds like your hardware might be fine.<br>
<br>
Phil<br>
<br>
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