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.

Flux estimation algorithms for electric drives: a comparative study

Author: Mohamad Koteich

Conference: REDEC – International Conference on Renewable Energies for Developing countries, July 2016, Lebanon.

DOI: 10.1109/REDEC.2016.7577558

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Abstract: This paper reviews the stator flux estimation algorithms applied to the alternating current motor drives. The socalled voltage model estimation, which consists of integrating the back-electromotive force signal, is addressed. However, in practice, the pure integration is prone to drift problems due to noises, measurement error, stator resistance uncertainty and unknown initial conditions. This limitation becomes more restrictive at low speed operation. Several solutions, reported in the literature, are reviewed and compared. Emphasis is placed on the low-pass filter based algorithms that show good performance in steady-state as well as in transient operating conditions.

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 “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.

Local Weak Observability Conditions of Sensorless AC Drives

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

Conference: 17th Conference on Power Electronics and Applications-EPE’15-ECCE Europe, Geneva, Switzerland, 8-10 September 2015

DOI: 10.1109/EPE.2015.7309238

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Abstract: Alternating current (AC) electrical drive control without mechanical sensors is an active research topic. This paper studies the observability of both induction machine and synchronous machine sensorless drives. Observer-based sensorless techniques are known for their deteriorated performance in some operating conditions. An observability analysis of the machines helps understanding (and improving) the observer’s behavior in the aforementioned conditions.

Permanent magnet synchronous drives observability analysis for motion-sensorless control

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

Conference: 6th IEEE International Symposium on Sensorless Control for Electrical Drives – SLED, Sydney, NSW, Australia, 7-8 June 2015.

DOI: 10.1109/SLED.2015.7339264

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Abstract: Motion-sensorless control techniques of electrical drives are attracting more attention in different industries. The local observability of sensorless permanent magnet synchronous drives is studied in this paper. A special interest is given to the standstill operation condition, where sensorless drives suffer of poor performance. Both, salient and non-salient machines are considered. The results are illustrated using numerical simulations.