I am running a stepper using the DRV8825 EVM and its GUI, and I am looking at the current at the ISENA testpoint. I am also looking at the average current which my power supply is providing.
If I grab the motor shaft to prevent it from turning, I observe that the current increases - based on both the ISENA testpoint as well as my power supply's current reading.
I thought that steppers driven by a bipolar chopping circuit should show no current change if they stall. Can you explain what I am seeing?