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Hello, I am trying to use a ball screw and its nut to back drive a motor with the end goal of generating power from the the U,V,W leads and I have a few questions pertaining to reversing the direction the energy flows in the motor. The motor currently selected is a AKM72Q for reference

1) Does the motors internal power and coils  efficiency change when it is being back driven?

2) Are the Kt and Kv values reversible for calculating current and voltage from a given torque and speed, if the motor is known ?