Question: Best settings for maximum torque of stepper motor

o_lampe · 27 Sept 2021, 13:18

@wieman01 Using the highes possible motor voltage helps. I'd also avoid stealthChop, (bad experience with earlier drivers on a different controller)
High Torque steppers usually have a higher inductance. Picking the right stepper can make a huge difference.

wieman01 · 27 Sept 2021, 14:03

@o_lampe said in Question: Best settings for maximum torque of stepper motor:

stealthChop

Thank you.

I did not mention I am using a Duet 2 with a TMC2660 driver, so Stealthchop is not supported anyway.

As for the stepper, yes, I will try another geared stepper, but was wondering if anything can be done here with a little tweaking.

jay_s_uk · 27 Sept 2021, 14:13

@wieman01 have you looked at the EMF calculator? https://www.reprapfirmware.org/emf.html

wieman01 · 27 Sept 2021, 15:16

@jay_s_uk said in Question: Best settings for maximum torque of stepper motor:

@wieman01 have you looked at the EMF calculator? https://www.reprapfirmware.org/emf.html

Yes, I have seen it, but I think the graph I have attached shows the same thing. The supplier provides it and I have taken the relevant range (up to 200 RPM) into account.

dc42 · 27 Sept 2021, 16:16

@wieman01 the graph you posted should be for a particular driver voltage. What voltage was quoted?

wieman01 · 27 Sept 2021, 17:21

@dc42 said in Question: Best settings for maximum torque of stepper motor:

@wieman01 the graph you posted should be for a particular driver voltage. What voltage was quoted?
Yes, this is for 24v. I am using a 24v PSU in combination with a Duet 2.

wieman01 · 27 Sept 2021, 17:35

@dc42 said in Question: Best settings for maximum torque of stepper motor:

@wieman01 the graph you posted should be for a particular driver voltage. What voltage was quoted?

Oh, I see my error now I think. The Duet pins I am connecting this stepper to only supply 5v. You're right.

Would it work if I connected the phase to the 24v VIN instead? Hope this is making sense.

The graph is for 24v.

dc42 · 27 Sept 2021, 17:54

@wieman01 said in Question: Best settings for maximum torque of stepper motor:

Oh, I see my error now I think. The Duet pins I am connecting this stepper to only supply 5v.

The stepper motor outputs provide up to almost VIN voltage, so 24V if you are providing 24V VIN.

wieman01 · 27 Sept 2021, 18:07

@dc42 said in Question: Best settings for maximum torque of stepper motor:

@wieman01 said in Question: Best settings for maximum torque of stepper motor:

Oh, I see my error now I think. The Duet pins I am connecting this stepper to only supply 5v.

The stepper motor outputs provide up to almost VIN voltage, so 24V if you are providing 24V VIN.

Thank you, yes, I see that now. Also it would not make much sense if they did not.

If nothing else works, I will try another (geared) stepper for that purpose.

dc42 · 27 Sept 2021, 19:04

@wieman01 what's the rated current of the stepper motor, and what motor current have you set?

wieman01 · 27 Sept 2021, 19:15

@dc42 said in Question: Best settings for maximum torque of stepper motor:

@wieman01 what's the rated current of the stepper motor, and what motor current have you set?

I am currently running it at 2.5A. The rated current is 3.0A per phase.

zapta · 27 Sept 2021, 23:12

@wieman01, can you improve the properties of the clay? E.g add water?

wieman01 · 28 Sept 2021, 08:40

@zapta said in Question: Best settings for maximum torque of stepper motor:

@wieman01, can you improve the properties of the clay? E.g add water?
Yes, you're right, in principle that is an option, however, in our case the viscosity of the material we are using cannot be changed for various reasons I won't bother you with.

I have order a geared stepper, let's see if that works out for us.