No-load Features of T-LSMs With Quasi-Halbach Magnets: Application to Free Piston Engines

Zouaghi, Mohamed Wael; Abdennadher, Imen; Masmoudi, Ahmed

doi:10.1109/tec.2016.2602547

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…where F c (1) and F c (N + 1) are the cogging forces applied to the stator end teeth. These forces are by far higher than the ones applied to the remaining stator teeth, resulting in a number of periods equal to 2 instead of N s + 1 [16].…”

Section: ) Cogging Forcementioning

confidence: 99%

“…Accounting for its trivial axial component [16], the air gap flux density is assumed to be equal to its radial component, as:…”

Section: B Case Of the Conventional Quasi-halbach T-lsmmentioning

confidence: 99%

“…With regard to the high cogging force peak-to-peak value, whether the machine poles are segmented or no, it should be underlined that this drawback is due to the end effect that affects most if not all linear machines [16].…”

Section: ) Cogging Forcementioning

confidence: 99%

“…Within the same application, Zouaghi et al investigated in [16] the no-load operation of a quasi-Halbach T-LSM. To start with, a formulation of the flux density spatial repartition has enabled the prediction of the no-load features.…”

Section: Introductionmentioning

confidence: 99%

“…Prior to initiate the investigation of the PM segmentation effect on the air gap flux density, this latter is expressed in the case of the conventional concept. The formulation developed hereunder is inspired from the model established in [16].…”

Section: Introductionmentioning

confidence: 99%

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Feature Investigation of a Segmented Pole Quasi- Halbach Tubular-Linear Synchronous Machine

et al. 2022

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The paper is aimed at an investigation of the features of a tubular-linear synchronous quasi-Halbach machine (T-LSM) where the radially-magnetized PMs are substituted by four equal segments with parallel magnetization. This substitution is done in an attempt to improve the machine cost-effectiveness which makes it a viable candidate to equip free-piston engine-based series hybrid propulsion systems. The study is initiated by an analytical formulation of the air gap flux density considering (i) the case of the conventional quasi-Halbach T-LSM and (ii) the case of the segmented pole one. The comparison between the two T-LSMs is extended to a 3D finite element analysis (FEA)-based investigation of their no-and on-load features. Following the prototyping of the quasi-Halbach T-LSM with segmented poles, selected features predicted by 3D FEA are experimentally-validated. It is shown that while the PM segmentation slightly affects the machine back-EMF and cogging force, it has a remarkable fallout on its force production capability which makes it necessary the assessment of the cost-performance trade-off.INDEX TERMS Quasi-Halbach PM tubular-linear synchronous machine, segmented poles, analytical model, 3D finite element analysis, no-and on-load features, cost-performance trade-off.

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Section: ) Cogging Forcementioning

confidence: 99%

“…Accounting for its trivial axial component [16], the air gap flux density is assumed to be equal to its radial component, as:…”

Section: B Case Of the Conventional Quasi-halbach T-lsmmentioning

confidence: 99%

Section: ) Cogging Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feature Investigation of a Segmented Pole Quasi- Halbach Tubular-Linear Synchronous Machine

et al. 2022

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Linear Machines: State of the Art with Emphasis on Sustainable Applications

Souissi

Abdennadher

Ahmed

2018

Linear Synchronous Machines

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Design and analysis of a novel yokeless mover permanent magnet linear generator for free piston engine converter

Tajdiny

Monsef

Lessani

2021

IET Electric Power Appl

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Free piston engine generator (FPEG) is one of the recent solutions by researchers used in hybrid vehicles, which eventually can contribute to the reduction of environmental pollutants from public transports. The purpose of the this work is to introduce a novel dual-stator permanent magnet linear generator with yokeless mover (DSPMLG) to improve the key parameters of the linear generator used in FPEG systems. In this work, an analytical model of the DSPMLG magnetic field is developed to investigate magnetic field flux density distribution and for back-EMF prediction. Then, a two-dimensional (2D) model of the DSPMLG is put forth using the finite element method (FEM) to validate the analytical results. In the next section, 1D modelling and simulation of a twostroke free-piston engine (FPE) with dual-piston structure is done using Ricardo's WAVE software. The obtained results are used in the FEM simulation and prototype development in order to accurately evaluate the performance of the introduced generator in the FPEG system. Since the FPE velocity profile distorts the back-EMF, the effect of the velocity profile on back-EMF distortion is investigated using fast Fourier transform. Also, the DSPMLG is optimised for minimum back-EMF distortion, considering the maximum output power. To validate the simulation results, the DSPMLG is developed and the obtained experimental results have proper conformity with the simulation results. Finally, in order to weigh up the effectiveness of the proposed generator, its structure is compared with other reported structures in previous research studies based on the key indicators required for the linear generator used in FPEGs.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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No-load Features of T-LSMs With Quasi-Halbach Magnets: Application to Free Piston Engines

Cited by 12 publications

References 20 publications

Feature Investigation of a Segmented Pole Quasi- Halbach Tubular-Linear Synchronous Machine

Feature Investigation of a Segmented Pole Quasi- Halbach Tubular-Linear Synchronous Machine

Linear Machines: State of the Art with Emphasis on Sustainable Applications

Design and analysis of a novel yokeless mover permanent magnet linear generator for free piston engine converter

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