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    TMC2160 StallGuard

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • Dizzwoldundefined
      Dizzwold
      last edited by

      Hi Guys,

      I'm considering setting up StallGuard on a couple of Nema23 motors using TMC2160 drivers.

      In the documents it states;
      Hmin = full_steps_per_rev * rated_current * actual_current/(sqrt(2) * pi * rated_holding_torque)

      Is "sqrt(2)" the square root of 2, ie 1.41421356237, ?
      Then x (multiplied) by pi,then x (multiplied) by holding torque?

      What's the best way to determine the actual motor current?
      I think this is where the Duet3 will come in, or would I just be better off buying the TMC2160 evaluation kit?

      I'd be very grateful for your input, more so as it is rather Off-Topic/Forum.

      oliofundefined dc42undefined 2 Replies Last reply Reply Quote 0
      • oliofundefined
        oliof @Dizzwold
        last edited by

        @Dizzwold rated current and rated holding torque are part if the stepper specification and you should be able to read them off of the spec sheet for the motor. Do note that Duet3d uses PEAK current and you will need to check with your manufacturer if the documented rating is RMS or PEAK.

        Do note that torque falls off with reduced current and not necessarily in a linear fashion. Some manufacturers provide torque curves, most do not.

        <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

        Dizzwoldundefined 1 Reply Last reply Reply Quote 0
        • Dizzwoldundefined
          Dizzwold @oliof
          last edited by

          @oliof

          Okay thank you for your advice.

          The part in the documents that states;

          "sqrt(2)"

          Does this mean, the square root of 2, ie 1.41421356237, ?

          Regards,

          Darren.

          oliofundefined 1 Reply Last reply Reply Quote 0
          • oliofundefined
            oliof @Dizzwold
            last edited by

            @Dizzwold yes

            <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

            1 Reply Last reply Reply Quote 1
            • dc42undefined
              dc42 administrators @Dizzwold
              last edited by

              @Dizzwold 'actual current' is the current you specify using the M906 command. sqrt(2) is the square root of 2.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

              Dizzwoldundefined 1 Reply Last reply Reply Quote 0
              • Dizzwoldundefined
                Dizzwold @dc42
                last edited by

                @dc42 @oliof

                Hi Guys,

                Thank you for your replies and confirming.

                Very grateful.

                Dizzwold.

                1 Reply Last reply Reply Quote 0
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