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Article
Publication date: 5 January 2015

Asma Masmoudi and Ahmed Masmoudi

The purpose of this paper is to compare the study between two topologies of fractional-slot permanent-magnet machines such that: double-layer topology and single-layer…

Abstract

Purpose

The purpose of this paper is to compare the study between two topologies of fractional-slot permanent-magnet machines such that: double-layer topology and single-layer one. The comparison considers the assessment of the iron loss in the laminated cores of the magnetic circuit as well as in the permanent magnets (PMs) for constant torque and flux weakening ranges.

Design/methodology/approach

The investigation of the hysteresis and eddy-current loss has been carried out using 2D transient FEA models.

Findings

It has been found that the stator iron losses are almost the same for both topologies. Whereas, the single-layer topology is penalized by higher iron loss especially the eddy-current ones taking place in the PMs. This is due to their denser harmonic content of the armature air gap MMF spatial repartition.

Originality/value

The analysis of the iron loss maps in different parts of each machine including stator and rotor laminations as well as the PMs, in one hand, and the investigation of their variation with respect to the speed, in the other hand, represent the major contribution of this work.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 34 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 4 January 2011

Asma Ben Rhouma and Ahmed Masmoudi

The purpose of this paper is to propose an approach to teach to post‐graduate students the basis of hybrid propulsion systems (HPS) with emphasis on their electric drive unit.

Abstract

Purpose

The purpose of this paper is to propose an approach to teach to post‐graduate students the basis of hybrid propulsion systems (HPS) with emphasis on their electric drive unit.

Design/methodology/approach

Following the introduction of the basic topologies of HPS, a case study is focused with an analysis of its current features. Of particular interest, those related to the flux‐weakening range extension and the cost‐effectiveness improvement are rethought in an attempt to stimulate the innovative capabilities of the students.

Findings

The adopted methodology has been integrated in a master course and has been found attractive and informative by the students.

Practical implications

The proposed teaching approach should be complemented by appropriate laboratory courses.

Originality/value

Thanks to the proposed methodology, the basis of HPS is no longer restricted to a selected population of the electrical engineering community.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 30 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 12 September 2008

Asma Ben Rhouma and Ahmed Masmoudi

The purpose of this paper is to describe the implementation of a direct torque control strategy dedicated to three‐switch three‐phase delta‐shaped inverter (TSTPI) fed…

Abstract

Purpose

The purpose of this paper is to describe the implementation of a direct torque control strategy dedicated to three‐switch three‐phase delta‐shaped inverter (TSTPI) fed induction motor drives as well as the comparison of its performance with those yielded by six‐switch three‐phase inverter (SSTPI) fed induction motor drives under the Takahashi DTC strategy.

Design/methodology/approach

Referring to the asymmetrical stator voltage vectors and in order to reach high dynamic with low ripple of the electromagnetic torque response, the design of the vector selection table should include virtual voltage vectors by the subdivision of each sector into two equal sub‐sectors.

Findings

It has been shown that the implementation of the proposed DTC strategy in TSTPI‐fed induction motor drives leads to higher transient behaviour and better steady‐state features than those exhibited by the Takahashi DTC strategy implemented in SSTPI‐fed induction motor drives.

Research limitations/implications

The research should be extended to a comparison of the obtained simulation results with experimental measurements.

Practical implications

A 50 per cent reduction of cost and compactness associated with a 50 per cent increase of reliability makes the TSTPI an interesting candidate, especially in large‐scale production applications such as the automotive industry.

Originality/value

The paper proposes an approach to improve the cost‐effectiveness, the compactness and the reliability of TSTPI‐fed induction motor drives, which represents a crucial benefit in electric and hybrid propulsion systems.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 27 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 26 August 2014

Asma Masmoudi and Ahmed Masmoudi

The purpose of this paper is to an analytical approach-based prediction of the eddy current loss in the PMs of a concentrated winding machine equipped with 12 slots in the…

Abstract

Purpose

The purpose of this paper is to an analytical approach-based prediction of the eddy current loss in the PMs of a concentrated winding machine equipped with 12 slots in the stator and ten poles in the rotor.

Design/methodology/approach

The investigation of the PM eddy current loss has been carried out using an analytical model and a 2D time-stepped transient finite element analysis (FEA).

Findings

It has been found, in the case of the treated machine, that just the subharmonic of rank 1 and the harmonic of rank 7 have significant contributions to the eddy current loss in the PMs.

Research limitations/implications

A shift between the results yielded by the developed analytical model and those computed by FEA has been noticed. This limitation is mainly due to the slotting effect which has been omitted in the analytical model.

Practical implications

Fractional slot PM machines are currently given an increasing attention in automotive applications. The prediction of their iron loss in an attempt to rethink their design represents a crucial efficiency benefit.

Originality/value

The analytical prediction of the eddy current loss in each PM then in all PMs and their validation by FEA represent the major contribution of this work.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 9 January 2007

Asma Ben Rhouma, Ahmed Masmoudi and Ahmed Elantably

This study seeks to examine the analysis and control of a three‐switch three‐phase inverter (TSTPI)‐fed brushless DC motor (BDCM) as well as the comparison of its…

Abstract

Purpose

This study seeks to examine the analysis and control of a three‐switch three‐phase inverter (TSTPI)‐fed brushless DC motor (BDCM) as well as the comparison of its performance with those yielded by six‐switch three‐phase inverter (SSTPI)‐fed BDCM drives.

Design/methodology/approach

The analysis of the six operating sequences of the TSTPI‐fed BDCM drive followed by the implementation of a dedicated self‐control strategy in such a drive and the comparison of its performance with those given by an SSTPI‐fed BDCM drive.

Findings

The dedicated self‐control strategy required the integration of a torque loop in the implementation scheme in order to reduce torque ripple amplitude during sequence‐to‐sequence commutations. It has been shown that the TSTPI‐fed BDCM offers high performances which are almost the same as those of the SSTPI‐fed BDCM.

Research limitations/implications

This work should be extended by building a test bench made up of a TSTPI‐fed BDCM and the comparison between simulation results and experimental ones.

Practical implications

A 50 per cent reduction in cost and compactness, and a 50 per cent increase in reliability make the TSTPI an interesting candidate especially in large‐scale production applications such as the automotive industries.

Originality/value

The paper proposes an approach to improve the cost‐effectiveness and the volume‐compactness of BDCM drives which represents a crucial challenge in electric and hybrid propulsion systems. It is the best solution compared with the conventional SSTPI and the four‐switch three‐phase inverter.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 26 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 1 January 2012

Asma Ben Rhouma and Ahmed Masmoudi

This paper deals with the analysis, the modeling, the control and the fault‐tolerance capability of a three‐switch inverter (TSI, also known delta‐inverter) fed…

Abstract

Purpose

This paper deals with the analysis, the modeling, the control and the fault‐tolerance capability of a three‐switch inverter (TSI, also known delta‐inverter) fed fractional‐slot six‐phase brushless DC motor (BDCM) drive.

Design/methodology/approach

Following the presentation of the advantages of multi‐phase fractional‐slot brushless machines and the possibility of their association to TSI, the analysis of the operating sequences as well as the modeling of a TSI fed six‐phase BDCM drive are developed. Then, a dedicated control strategy of such a drive is synthesized. Finally, a case study is simulated considering both transient behaviour during the start‐up of the BDCM as well as a steady‐state one under healthy and faulty operations.

Findings

It has been found that the 60‐electrical degree shift between the six phases of the BDCM makes it simple to achieve its operating sequences with its armature fed by a TSI, considering a suitable anti‐parallel connection of the six phases.

Practical implications

Crucial cost benefits associated with improved compactness, reliability, and fault‐tolerance capability could be gained thanks to the integration of TSI fed six‐phase BDCM drives in large‐scale production industries, such as the automotive one.

Originality/value

The paper proposes an analysis of the operating sequences as well as the fault‐tolerance capability of TSI fed six‐phase BDCM drives.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 31 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

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