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Date: Fri, 12 Feb 2016 16:22:57 -0500
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Subject: Re: [geda-user] Stepper Driver Question
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Fri, Feb 12, 2016 at 3:36 PM, Rob Butts (r DOT butts2 AT gmail DOT com) [via
geda-user AT delorie DOT com] <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.

Is there a ceramic capacitor or inductor on the board that could be
singing? Are you completely sure it is coming from the motor?

Could you try positioning a pickup coil connected to an oscilloscope
near the motor or as a current sense on one of the windings?

> 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 think it is microstepping and the output is class D or what ever.

> I can't attach the screenshot of the evaluation board io.
>
> Any suggestions?
>
> Thanks



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