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 motor's equivalent RL circuit that is seen by the controller (which determines the PI coefficients) will vary depending on the motor type. For BLDC and Permanent Magnet Synchronous Motors (PMSMs), R is simply the stator resistance, and L is the stator inductance. But with AC Induction Motors (ACIMs), this is not the case. The equivalent inductance value that is needed to use for both axes is not the stator inductance value, but rather the "series" inductance (or sometimes called the "leakage" inductance) which is defined as follows:
Where:
Also, the resistor value seen by the current controllers for an ACIM will be different between the d and q axes. For the d-axis controller, the equivalent resistance is simply the stator resistance Rs. However, for the q-axis, the equivalent resistance is the sum of the stator resistance plus the rotor resistance (Rs + Rr). If these subtleties are not taken into consideration when calculating and , you could end up with a PI controller that is incompatible with your motor, resulting in less than optimal control.