Combined flux observer with signal injection enhancement for wide speed range sensorless direct torque control of IPMSM drives / Andreescu, G. in IEEE transactions on energy conversion, Vol. 23 n°2 (Juin 2008)  

Combined flux observer with signal injection enhancement for wide speed range sensorless direct torque control of IPMSM drives [texte imprimé] / Andreescu, G., Auteur ; Pitic, C.I., Auteur ; Blaabjerg, F., Auteur . - 2008 . - pp. 393 - 402.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°2 (Juin 2008) . - pp. 393 - 402

Mots-clés :	Permanent magnet motors  rotors  synchronous motor drives  torque control
Résumé :	This paper proposes a motion-sensorless control system using direct torque control with space vector modulation for interior permanent magnet synchronous motor (IPMSM) drives, for wide speed range operation, including standstill. A novel stator flux observer with variable structure uses a combined voltage-current model with PI compensator for low-speed operations. As speed increases, the observer switches gradually to a PI compensated closed-loop voltage model, which is solely used at high speeds. High-frequency rotating-voltage injection with a single D-module bandpass vector filter and a phase-locked loop state observer with a new synchronization procedure are used to estimate the rotor position, which is needed only by the current model in stator flux observer at low speeds. A new rotor speed estimator for the whole speed-loop range, based on the stator flux speed estimation with a new dynamic correction depending on estimated torque, is proposed and tested. Extensive simulation results and significant experimental results provided good performance for the proposed IPMSM sensorless system in more than 1:1000 speed range, under full-load operation, from very low speeds (1 r/min experimental) up to rated speed.
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