Stepper motors overheat

[wsh32]

When running the stepper motor continuously over an extended amount of time (30 min +) it overheats.

Will investigate

[wsh32]

Seems like we have to calibrate the drivers' built in current limiting. Here is a video of how its done. We should do this for every stepper driver we get.

https://www.youtube.com/watch?v=89BHS9hfSUk

For the pololu A4988 carriers, the V_ref is found using the following equation:

8 * I_max * R_cs

R_cs for the A4988 carriers is 0.068 ohms

The motors we are currently using (subject to change) is rated for 0.33A. This gives us a V_ref of 0.179.

With a factor of safety, we'll set V_ref to 0.16.

[wsh32]

did not fix it, still have heating issues when runnign over long amounts of time.

will need to write a automatic shutdown