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
Keywords
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 induction…
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
Keywords
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 fractional‐slot…
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
Keywords
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 performance with…
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.