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Posts

Future Blog Post

less than 1 minute read

Published: January 01, 2199

This post will show up by default. To disable scheduling of future posts, edit config.yml and set future: false.

Blog Post number 4

less than 1 minute read

Published: August 14, 2015

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 3

less than 1 minute read

Published: August 14, 2014

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 2

less than 1 minute read

Published: August 14, 2013

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 1

less than 1 minute read

Published: August 14, 2012

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

portfolio

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publications

Sensitivity Analysis on the Sizing Parameters of a Series-Parallel HEV

Published in IFAC International Symposium on Advances in Automotive Control, 2019

As an alternative to power-split hybrid architectures, a simple series-parallel architecture named SPHEV 2 can be realized. In this paper, the sizing process of this architecture is briefly presented and a deeper analysis is made. Mathematical sensitivity analysis studies are conducted on the sizing parameters of the architecture in order to bring more understanding to the optimization results. Local and global sensitivities are performed to understand the influence of the sizing variables on the fuel consumption. An analysis of the sensitivities is also made.

Recommended citation: T. El Hajji, B. Kabalan, Y. Cheng, E. Vinot and C. Dumand, "Sensitivity Analysis on the Sizing Parameters of a Series-Parallel HEV", IFAC-PapersOnLine, vol. 52, no. 5, pp. 405-410, 2019 https://www.sciencedirect.com/science/article/pii/S2405896319306871?via%3Dihub

Efficiency Improvement of a Series–Parallel Hybrid Electric Powertrain by Topology Modification

Published in IEEE Transactions on Vehicular Technology, 2019

Among Series-Parallel Hybrid Electric Vehicle (SPHEV) powertrains, the Power-Split architecture with a planetary gear has an exemplary energetic efficiency in mixed driving conditions. Nevertheless, a simple SPHEV architecture can be realized without a planetary gear. It consists of 2 Electric Machines (EM) mounted on the engine shaft and separated by a clutch. With no power-split operation, this architecture allows the vehicle to operate in pure electric, or series hybrid, or parallel hybrid mode. It was proven to be less efficient than a reference Power-Split SPHEV; the Toyota Hybrid System (THS). The aim of this paper is to investigate the potential of efficiency improvement of the simple SPHEV powertrain by topology modification; the addition of gears for the components or a gearbox with few number of ratios. Two new variants of SPHEVs are proposed. The versions of SPHEVs and the reference THS are optimized by a bi-level optimization technique using Genetic Algorithm and Dynamic Programming. Compared to the simple SPHEV, results show an efficiency worsening in one variant and an efficiency improvement in another variant with a fuel consumption comparable to the one of THS. A global sensitivity study is then performed on the worsened variant. The sensitivities of the added gears are determined and an elimination of some is suggested. A new variant with fewer gears is therefore proposed and optimized. The efficiency is improved but remains less than the one of THS.

Recommended citation: B. Kabalan, E. Vinot, C. Yuan, R. Trigui, C. Dumand and T. E. Hajji, "Efficiency Improvement of a Series–Parallel Hybrid Electric Powertrain by Topology Modification," in IEEE Transactions on Vehicular Technology, vol. 68, no. 12, pp. 11523-11531, Dec. 2019, doi: 10.1109/TVT.2019.2952190 https://ieeexplore.ieee.org/document/8894384

Hybrid model for AC Losses in High Speed PMSM for arbitrary flux density waveforms

Published in International Conference on Electrical Machines (ICEM), 2020

Increasing speed of electric machine leads to high losses especially in stator winding assembly due to eddy currents effect. Commonly adopted formula for AC losses calculation tends to be applicable in the case of sinusoidal flux density. In this paper, a hybrid model predicting AC winding loss is presented based on one slot per pole of surface-mounted permanent-magnet machines using two formula taking into account the true flux density waveform. The results obtained comply with finite-elements results. The hybrid model was also used to investigate the influence of tooth-tip on AC losses.

Recommended citation: T. E. Hajji, S. Hlioui, F. Louf, M. Gabsi, G. Mermaz-Rollet and M. Belhadi, "Hybrid model for AC Losses in High Speed PMSM for arbitrary flux density waveforms," 2020 International Conference on Electrical Machines (ICEM), Gothenburg, Sweden, 2020, pp. 2426-2432, doi: 10.1109/ICEM49940.2020.9271017 https://ieeexplore.ieee.org/document/9271017

Optimal Design of High-Speed Electric Machines for Electric Vehicles: A Case Study of 100 kW V-Shaped Interior PMSM

Published in Journal: MDPI Machines / Special Issue: Optimal Design of a High-Speed Motor, 2023

The need of compact machines increased in recent years due to increases in raw materials’ price. Hence, many studies are currently being conducted on high-speed challenges to propose an optimal design methodology. AC losses in windings are often not included in the optimization process and are treated in post-processing by choosing a suitable conductor’s diameter to mitigate skin and proximity effects. This paper presents an optimization and design methodology for high-speed electric machines considering these losses, using models with an interesting trade-off between computation time and accuracy, which is helpful for large-scale optimization, in which more than 9,600,000 machines are evaluated. Optimizations are conducted on 100 kW high-speed one-layer V-shaped interior permanent magnet synchronous machines, widely used in vehicles thanks to their high power density, based on the specifications of the Peugeot e208, for different values of pole pairs and maximum speed. The influence of lamination thickness, fill factor, and maximum current density on the optimal design is also investigated. This paper concludes the utility of increasing speed to achieve high power density and proposes best alternatives regarding automotive constraints. Results show that the number of pole pairs is not always a key parameter in obtaining the lowest volume, especially at high speed.

Recommended citation: T. El Hajji, S. Hlioui, F. Louf, M. Gabsi, G. Mermaz-Rollet, and M. Belhadi, “Optimal Design of High-Speed Electric Machines for Electric Vehicles: A Case Study of 100 kW V-Shaped Interior PMSM,” Machines, vol. 11, no. 1, p. 57, Jan. 2023, doi: 10.3390/machines11010057 https://www.mdpi.com/2075-1702/11/1/57