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Contribution à la commande sans capteur mécanique d' actionneurs électriques motorisés par des machines synchrones à aimants permanents

Abstract : For their high power density and ease of control, permanent magnet synchronous motors (PMSM) are widely used in more electric aircraft. In order to control PMSMs, precise information on the rotor position is required. This information is provided by position sensors which have inherent drawbacks despite their good precision: these sensors decrease reliability and increase weight, volume, and cost of the whole system. In this thesis, we present a mechanical sensorless control method by estimating the rotor speed and position only from the phase currents measurements. Sensorless control methods suitable for high speeds and based on back-EMF estimation are first discussed. Then, a state of the art in sensorless methods for low speeds operations is presented. A new sensorless control, independent from the motor parameters, is presented for operating at low speeds and standstill. Both simulations (on a PMSM model taking into account the saturation phenomenon) and experimental results show the effectiveness of this model-independent method. A convergence analysis and a robustness study of the proposed algorithm are also made. Finally, an initialization process and a method for smooth transition between low and high speeds methods are proposed and validated on an experimental test-bench
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https://hal.univ-lorraine.fr/tel-01750127
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Sami Zaim. Contribution à la commande sans capteur mécanique d' actionneurs électriques motorisés par des machines synchrones à aimants permanents. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0134⟩. ⟨tel-01750127⟩

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