Commande non linéaire et observateurs : application à la MRV en grande vitesse

Abstract : This work deals with the closed loop control of a switched reluctance motor (SRM) used for high speed machining. The principle of operation of a 6/2 SRM and its model are firstly presented. The design of a performant and robust control law depends on the knowledge of the SRM model parameters. Sensorless position parameters identification has allowed to obtain the electromagnetic characteristic and the mechanical parameters. Hydrodynamic and aerodynamic friction phenomena have been highlighted. The highly nonlinear character of the SRM makes the control difficult. The closed loop control of the SRM running at low speed showed the interest of using the feedback linearizing control technique. However at high speed, several specific problems limit the drive performances in the closed loop. The main aspects of a high speed running SRM have been analysed through the results of the simulations of feedback linearizing voltage and current control law. When the position information is available, an unknown input observer has been developed and experimented. In order to tackle the lack of a performant position sensor at high speed, a nonlinear reduced order observer has been studied. Finally, a real time control system has been realized in order to test the control laws. Real time Linux (RTAI) operating system combined with the data acquisition boards have allowed to obtain 10 s sampling frequency behavior of the control system. The graphical interface and data acquisition are executed by distinct processors.
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Codrut Ion Alin Visa. Commande non linéaire et observateurs : application à la MRV en grande vitesse. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ026S⟩. ⟨tel-01750072⟩

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