Abstract
For the disadvantage of the induction motor direct torque control system’s performance when it runs in a low velocity, the full order flux observer is used to achieve the stator flux observation, and the flux observer precision and the convergence rate depend on proper allocation of the observer poles. Based on the analysis of two full order flux observer pole placement methods,a single degree of freedom pole placement method is proposed, analyzed and discussed. This method can assign the configuration parameters of the observer gain matrix effectively. The simulation results show that the new pole assignment method can effectively inhibit the motor parameter variations and motor rotational velocity impacts the observer gain matrix’s parameters, so it can improve the flux observer and the observed convergence rate precision.
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