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This paper deals with the Permanent Magnet Synchronous Motor (PMSM) observability analysis for sensorless control design. The problem of loss of observability at low frequency range is always recognized in experimental settings. Nevertheless, there are no sufficient theoretical observability analyses for the PMSM. In the literature, only the sufficient observability condition has been presented. Therefore,...
In this paper, an Estimator/Observer Swapping system is proposed, for the surface Permanent Magnet Synchronous Motor (PMSM), to overcome position observability problems at zero speed which is an unobservable state point. The designed observer based on Higher Order Sliding Mode (HOSM) is used in order to ensure the robustness against disturbances and to avoid the chattering phenomenon which is inherent...
This paper presents the design of a simple and effective speed and position observer for a Surface Permanent Magnet Synchronous Motor (SPMSM). The proposed observer based on Higher Order Sliding Mode (HOSM) is designed in order to ensure the robustness against disturbances and to avoid the chattering phenomenon which is inherent in standard first order sliding mode. The stability and finite time convergence...
The current problems to successfully apply sensorless control techniques for Permanent Magnet Synchronous Motor (PMSM) are the existence of operating conditions for which the observer performance is remarkably deteriorated. This is due to difficulties in estimating correctly the rotor position at low speed. The failure of sensor-less schemes in some particular operating conditions has been always...
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