Self-sensing control of the externally-excited synchronous machine for electric vehicle traction application

Authors: Mohamad Koteich, Amir Messali, Simon Daurelle

Conference: 2017 IEEE International Symposium on Sensorless Control for Electrical Drives (SLED), Catania, Italy.

DOI: 10.1109/SLED.2017.8078436

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Abstract: This paper studies the possibility of removing the position sensor from electric vehicles (EVs) powertrains that employ the externally-excited synchronous machine (EESM) for traction. Three position estimation approaches are studied: back-electromotive-force integration, state-observer and high-frequency voltage injection approaches. Theoretical background is presented, a comparative performance analysis is performed, and experimental results on a 65-kW EESM drive test bench are shown. Some requirements for EV powertrains are emphasized.

A unified model for low-cost high-performance AC drives: the Equivalent Flux concept

Authors: Mohamad Koteich, Gilles Duc, Abdelmalek Maloum, Guillaume Sandou

Conference: The Third International Conference on Electrical, Electronics, Computer Engineering and their Applications (EECEA2016), Apr 2016, Beirut, Lebanon.

DOI: 10.1109/EECEA.2016.7470768

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Abstract: This paper presents a unified modeling approach of alternating current (AC) machines for low-cost high-performance drives. The Equivalent Flux concept is introduced. Using this concept , all AC machines can be seen as a non-salient synchronous machine with modified (equivalent) rotor flux. Therefore, complex salient-rotor machines models are simplified, and unified shaft-sensorless AC drives can be sought. For this purpose, a unified observer-based structure for rotor-flux position and speed estimation is proposed. The equivalent flux concept generalizes the existing concepts, such as the extended back-electromotive force, the fictitious flux and the active flux.

Discussion on “AC Drive Observability Analysis”

Authors: Mohamad Koteich, Abdelmalek Maloum, Gilles Duc, Guillaume Sandou

Journal: IEEE Transactions on Industrial Electronics, 62(11):7224–7225.

DOI: 10.1109/TIE.2015.2438777

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Abstract: In the paper by Vaclavek et al. ( IEEE Trans. Ind. Electron., vol. 60, no. 8, pp. 3047-3059, Aug. 2013), the local observability of both induction machine and permanent-magnet synchronous machine (PMSM) under motion-sensorless operation is studied. In this letter, the “slowly varying” speed assumption is discussed, and the PMSM observability condition at standstill is revisited.

Discussion on “A Differential Algebraic Estimator for Sensorless Permanent-Magnet Synchronous Machine Drive”

Authors: Mohamad Koteich, Abdelmalek Maloum, Gilles Duc, Guillaume Sandou

Journal: IEEE Transactions on Energy Conversion, 30 (3), 1137-1137.

DOI: 10.1109/TEC.2015.2459791

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Abstract: Diao et al. are to be commended for proposing a new approach for permanent magnet synchronous machine (PMSM) position estimation, using the differential algebraic theory. In the following comments, we would like to highlight some points concerning the machine observability under the applied approach.