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
Figure 7-52 shows the current of one phase with the transition from Rs recalibration to the online state.
As can be seen in the plot, the phase current slopes from the current injected to recalibrate Rs to the current needed by the load. From the plot this takes 0.75 s.
In the case of no mechanical load on the motor's shaft, we can clearly see the current slope to be the current injected for Rs recalibration per second. For example, if 1 A was used to recalibrate the stator resistance, it will take 1 second for the controller to remove that current from the D-axis (ID) all the way to zero. The current remaining in the motor phases will be the IQ current, which will depend on the motor's mechanical load.