SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
The stator resistance from phase to phase shown in the previous motor's datasheet is 0.72Ω. What we need in user.h file is the phase to neutral resistance in a Y connected motor. In this case, the operation is a simple divide by 2 to convert from phase to phase resistance to phase to neutral resistance since the motor is known to be connected in Y configuration. The operation from line to line (Y connected motor) to line to neutral is as follows:
The resulting value is then written in user.h as follows:
#define USER_MOTOR_Rs (0.36)
In the motor, if delta connected as opposed to Y connected, then a conversion from delta to Y needs to be done to set the resistance value. For example, if the delta Rs (delta) value is known to be 3 Ohms, the Rs (Y) value would be Rs (Y) = Rs (delta) / 3 = 1 Ohms.