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 of the motor’s coils, also noted as Rs, can vary drastically depending on the operating temperature of the coils (also known as motor windings). This temperature might increase due to several factors. The following examples list a few of those conditions where the stator coils temperature might be affected:
As a result of the temperature increase, there is a resistance increase on the motor's windings. This resistance to temperature relationship is well defined depending on the materials used for the windings themselves.
Rs online recalibration is a feature of InstaSPIN-FOC that is used to recalibrate the stator resistance, Rs, while the motor is running in closed loop. The term online in this case is used to describe a system that is running a motor in closed-loop field-oriented control (FOC). This feature is implemented internally within the FAST estimator, and source code is not available, however, all the parameters within this feature can be modified according to applications requirements, as it will be explained in this chapter. Figure 16-1 shows the FAST estimator, highlighting the interface areas related to Rs Online.