Abstract
A nonlinear state observer design with sampled and delayed output measurements for variable speed and external load torque estimations of SPMSM drive system has been addressed, successfully. Sampled output state predictor is re-initialized at each sampling instant and remains continuous between two sampling instants. Throughout this study, a positive constant to satisfy an upper limit of the sampling period between sampling instants and allowable timing delay in terms of observer parameters has been prepared such that the exponential stable of the closed-loop system is guaranteed, based on Lyapunov stability tools. In order to validate the theoretical results introduced by main fundamental theorem to prove the observer convergence, the proposed sampled-data observer is demonstrated through a sample study application to variable speed SPMSM drive system.
Highlights
In recent decays, synchronous machines are used in variable speed motoring and the manufacturers had been made synchronous machines based on permanent magnets in wide power range with various categories and structures
In order to validate the theoretical results introduced by main fundamental theorem to prove the observer convergence, the proposed sampled-data observer is demonstrated through a sample study application to variable speed SPMSM drive system
Synchronous machines are used in variable speed motoring and the manufacturers had been made synchronous machines based on permanent magnets in wide power range with various categories and structures
Summary
Synchronous machines are used in variable speed motoring and the manufacturers had been made synchronous machines based on permanent magnets in wide power range with various categories and structures. One looks for accurate observation of the unmeasured mechanical state variables, which are angular rotated speed and external load torque for surface permanent magnet synchronous motor SPMSM, supposing the stator current and voltage to be accessible for measurements. To this end, a sampled-data nonlinear state observer will be designed with sampled and delayed output measurements coupled with inter-sampled output state prediction. The problem statement which leads us to prove the exponential convergence of the global exponential stabilization and state estimation of nonlinear systems coupled with sampled–data observer design based on main theorem.
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