Speed and rotor position estimation is mandatory for vector control scheme of Permanent
Magnet Synchronous Motor (PMSM). The estimation accuracy of Non-adaptive (Open loop) methods
degrades as mechanical speed reduces. The system becomes more robust against parameter
mismatch and signal noises by employing adaptive observers for estimation of speed and position.
Sensorless scheme adopted for estimating the PMSM rotor position based on its performance which
eliminates the need for speed sensors which are usually required in such control applications. To
achieve this goal, a Space Vector Pulse Width Modulation (SVPWM) control scheme is applied to
work in conjunction with a vector control PMSM drive using Simulink. The PI controller uses from
estimated speed feedback for the speed sensorless control of PMSM.
In this paper, a comprehensive analysis of sensor-based and sensorless based on sliding mode observer
(SMO) techniques for vector control of PMSM is presented with regards to the steady-state
and dynamic performance robustness against parameter sensitivity, stability and computational
complexity. The control scheme is simulated in the MATLAB/Simulink software environment.
Keywords: Permanent Magnet Synchronous Motor (PMSM), Sliding Mode Observer (SMO), vector control, Sensorless Control
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