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question:how does gMotorVars.Rs_Ohm figure out in motorware labs

Hello, I had some trouble with gMotorVars.Rs_Ohm in labs program. Everytime when i try to run the motor, this value 

Approach to zero.

And I found that this value is figure out in ROM.

Please tell me the what Factors will affecting the value.(hardware & software param)

Thank you very much.