Hi, is my first time dealing with motors and drivers, and I’ve already read some guides and questions to introduce myself and understand some theory, however, there’s some doubts that I have yet (maybe can be very basic for you):
Vref= Imax*(8*Rs)
I’m trying to understand how to set the Vref by this formula when I’m planning to use the 1/2nd or 1/4- 1/8- or 1/16-, -th microstep mode. I know that I’ve to calculate the final Vref multiplying the Vref of the formula by 0.7 as the Table 2: Step Sequencing Settings of the A4988 Datasheet says but what I’ve understood is that that factor (0.7) is for the full-step mode (maybe I’m wrong) and in my case I want to use the microsteps.
Values:
Imax=1.7A (from the Datasheet of my NEMA17)
Rs= 0.1 Ohm (R100)
Another doubt is that I currently have a Bipolar NEMA17 stepper motor with 1.7A/Phase, I know that the chip itself can handle up to 2A with sufficient additional cooling (that I will implement), considering that, do you recommend using the DRV8825? In that case, could you specify the calculation for the microstep mode too, please?
My application is the extrusion of a liquid with low viscosity, I think that it wouldn’t need to much torque so I can change the motor later but is what I’ve at the moment, but the microstep mode is very relevant (and learn how to set the Vref values in that mode).
Thanks