X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com Subject: Re: [geda-user] Stepper Driver Question To: geda-user AT delorie DOT com References: From: "P. Taylor" Message-ID: <56BE4EF3.4040209@plastitar.com> Date: Fri, 12 Feb 2016 16:30:27 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------000709020102090509030501" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - omega.hrwebservices.net X-AntiAbuse: Original Domain - delorie.com X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - plastitar.com X-Get-Message-Sender-Via: omega.hrwebservices.net: authenticated_id: phil AT plastitar DOT com X-Authenticated-Sender: omega.hrwebservices.net: phil AT plastitar DOT com X-Source: X-Source-Args: X-Source-Dir: Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk This is a multi-part message in MIME format. --------------000709020102090509030501 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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 --------------000709020102090509030501 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

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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