Need help calculating the torque output of a NEMA 17 stepper motor.

[Serena]

Hi everyone,
Currently running a 1.8 degree 42mm NEMA 17 hybrid stepper motor (https://www.oyostepper.com/category-6-b ... Motor.html) at 10V and 0.189A, I get a torque of about 66g-inches or 2.32oz-inches (experimentally obtained).
But my real question is, according to the datasheet for this motor on the website, it should produce about 28oz-inches at 12V and 0.35A. Is there a mathematical formula I can use to "scale" this torque value from my experimental numbers? Or I guess what I'm asking is, is there a way to mathematically get the torque output of a stepper motor based on given inputs (e.g. voltage, current, resistance, etc.). I know there are things like pull-in torque, pull-out torque, detent torque, motor constants, etc. But I've been searching online and there seem to be a lot of explanations about the torque output of motors.

It would be great if someone could teach me a little bit about stepper motors, or share some calculation formulas.

[ACascarino - XMOS]

Hi Serena,

Torque calculation for a stepper motor is non-trivial.
Luckily, someone has already created a spreadsheet to model the torque curve for a set of given parameters.
This is obviously just a prediction, and your real values may vary - however, you should be able to simply adjust based on observations