Influence of winding resistance on flux-weakening performance of a permanent magnet brushless AC drive

In most previous studies of the flux-weakening performance of the permanent magnet brushless AC drives, the stator winding resistance has either been neglected or compensated for simply by subtracting the estimated maximum voltage drop across the winding resistance from the supply voltage, so as to simplify the control algorithm. This paper describes several alternative control schemes which account for the influence of the stator winding resistance, and compares their performance experimentally.