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Mail Archives: geda-user/2015/04/23/17:45:01

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Thu, 23 Apr 2015 14:44:32 -0700 (PDT)
Message-ID: <553967BB.4010504@m0n5t3r.info>
Date: Fri, 24 Apr 2015 00:44:27 +0300
From: Sabin Iacob <iacobs AT m0n5t3r DOT info>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Stepper driver issues
References: <CALSZ9goH9CUT=5DStdVUG4d45ff30WieHc2-DsXpjX=7cf42Nw AT mail DOT gmail DOT com> <5536A38F DOT 50104 AT m0n5t3r DOT info> <CALSZ9gpoqcOxNRDvwEHipCgkHq0z+KmPY2AWBdRC_DRnz5SD+w AT mail DOT gmail DOT com> <20150422013637 DOT GF29418 AT cicely7 DOT cicely DOT de> <CALSZ9go_mem7Kt5GD0_yBx=KP86zzVV0hDiY9K62k41FoTDnig AT mail DOT gmail DOT com> <20150422161012 DOT GA42355 AT cicely7 DOT cicely DOT de> <CALSZ9grVrYv0BS3_y7ez8VXBwTXxAMazWB6gdCuLUe2+6Uzzyw AT mail DOT gmail DOT com> <CALSZ9gq73RBxHV5LPe7pQWNO3kK7EPXaRiN0U7zFBV9BsQX78w AT mail DOT gmail DOT com> <55395CD0 DOT 70107 AT m0n5t3r DOT info> <CALSZ9grLt0gGmEBPVzCi5VGQz9yFCZbgQyR4Bp_8Ugu7wXu8Ww AT mail DOT gmail DOT com>
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Reply-To: geda-user AT delorie DOT com

On 04/24/2015 12:11 AM, Rob Butts wrote:
> I'm wondering if I can use the DRV8825 to drive a nema 23 2.8A stepper
> without cooking the DRV8825.​

the worst case is that you won't get the maximum rated torque out of the
motor: these drivers operate in current mode - you configure the maximum
current somehow (DRV8825 has a pot, the chip that died on you has a
resistor voltage divider in the datasheet schematic), and depending on
the microstepping setting you either get one or several steps between
zero and the maximum set current, the motor can't "draw" more and kill
your driver unless the current limit you have set exceeds the limits of
some component (sense resistor, driver chip's thermal capacity, etc.).

- Raw text -


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