| Abstract |
The paper develops a flux-linkage estimator, using voltage-model in stator reference, based on an
equivalent integrator in closed-loop with a speed-adaptive PI compensator to eliminate the DC-offset.
Based on this accurate flux-linkage estimation, a speed and position observer using phase-locked loop
(PLL) technique with sliding-mode compensator speed-adaptive is developed. This proposed solution
is a general approach that can be used in vector control of universal AC drives with sinusoidal flux
distribution, including sensorless vector control. As application example, a sensorless control for
permanent magnet synchronous motor (PMSM) with current-vector control method is presented.
Simulation results prove high-dynamic performances in wide speed range step reversal, for zero to
rated load-torque step. The DC-offsets and the errors in flux initial-position are canceled. |
