3 phase/BLDC analysis

I was hoping that someone may be able to help me get a start in analyzing a 3 phase brushless DC motor. My goal is to be able to detect
failure modes from an electrical perspective. The system includes a 3 phase BLDC motor driver, 3 phase bridge driver as part of the motor driving console. The motor is within a hand piece which can be subjected to saline (salt water). Therefore under the failure mode saline enters the hand piece and comes in contact with gearing and the motor.
Some of the failure modes include motor being exposed to saline, gearing being exposed to saline, and side load on the main driveshaft, potentially causing harm to the gearing.

to look at to analyze the system? I would like to be able to determine when the motor is not operating properly. I am not sure what properties to look at.
Since I am time restrained (aren't we all), I would like to cut to the chase. Please let me know if more information is needed!
I remember studying power factor and other AC 3-phase based properties back in school but that was more or less for AC application. I figured the pf would not change unless the phase would change.
Thank you in advance!
Brian
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