Improved Rotor Flux Estimating Technique Based on Current Model in FOC method

Abstract

This paper presents an improved rotor flux estimation algorithm method based on current-voltage signals applied to field-oriented control (FOC) technique in multi-domain motor speed control. This mathematical model is designed to accurately determine the rotor flux vector from the feedback signals of the current and speed sensors. The two steps of converting three-phase current signals in the real-time domain to create spatial vectors in two domains of static coordinates and rotating coordinates corresponding to the rotor flux vector will be presented in detail in the paper. The results are simulated in MATLAB/Simulink environment to demonstrate the feasibility of the typical FOC and the proposed FOC method under different operating and loading conditions of the induction motor drive. The simulation results convincingly illustrate the effectiveness of the proposed induction motor control method.