COMPARATIVE STUDY OF ROTOR INITIAL POSITION ESTIMATION TECHNIQUES

For permanent magnet machines, including brushless DC (BLDC) machines and brushless AC (BLAC) machines, rotor initial position can be estimated based on magnetic saturation effect. Many techniques have been proposed by applying voltage pulses to stator windings and using current or voltage responses to estimate the rotor initial position. Hence, a comparative study of rotor initial position estimation techniques utilizing magnetic saturation effect is carried out in this paper. Depending on different measurements or components that are used for rotor initial position estimation, 5 different methods are compared and validated by simulation and experiment results.