TMC2160 StallGuard

[Dizzwold]

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.

[oliof]

@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.

[Dizzwold]

@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.

[oliof]

@Dizzwold yes

[dc42]

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

[Dizzwold]

@dc42 @oliof

Hi Guys,

Thank you for your replies and confirming.

Very grateful.

Dizzwold.