Sensorless Stator Flux Oriented Control of Induction Motors using PLPF with Flux Error Compensator

In this paper, the way to compensate for flux error caused by estimated stator resistance error will be suggested when PLPF is utilized as flux estimator, which is used for sensorless vector control of induction motor. For the highly efficient sensorless control, flux estimation method using PLPF has been widely used. To accurately obtain flux using PLPF, it is significant to estimate synchronous angular velocity. Therefore, the way to make use of PLPF's phase lag error has been suggested; however, to be more accurate, flux magnitude error should be seriously considered and compensated. Error of flux magnitude usually takes place because of estimation error of stator resistance. For this reason, this paper works out a way to make up for the flux magnitude error while using PLPF and it would be proved with simulations and experimental results.