Part Number:DRV10975EVM
Greetings. I am evaluating the DRV10975 as a replacement for the DRV11873 due to the false rotor lock issue associated with the DRV11873. I've worked through the tuning guide, and I appear to have good motor operation at this point . . . but I consistently get a BEMF abnormal reported (#2 fault code). I've confirmed Kt to be ~16 (4V peak to peak, 8ms period) using the finger spin method. I've also confirmed phase to phase resistance and divided by two (2.11 ohms). Odd thing is, if I start the program with the defaults. The motor spins (poorly, can't get out of open loop) with no BEMF abnormal error reported - resistance = 1.17, Kt = 120.
And unfortunately I will need the BEMF error since the motor does not seem to draw enough current in a locked state to trip the rotor lock requirements (more current is drawn during acceleration, etc).
Rapid help appreciated, we are in a bit of a bind with this last minute DRV11873 discovery and so far I'm not feeling too confident in the DRV10975.
-Chris