Analysis of tubular-type linear generator for free-piston engine

Hong, Sun-Ki; Choi, Ho-Yong; Lim, Jaewon; Lim, H.S.; Jung, Hyunwoo

doi:10.24084/repqj05.365

Cited by 6 publications

(4 citation statements)

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“…An experimental study by Oh et al [55] confirmed that it was easy to set an optimum in-cylinder combustion pressure for a two-stroke dual-piston FPLE by changing the spark timing. In addition to the effects of spark timing, experimental studies have also found the effects of operating conditions, structural parameters, and kind of fuel on the combustion characteristics of FPLEs [40,51,52]. Woo et al [71] conducted an experiment on a dual-piston FPLE fueled with hydrogen and compressed natural gas (CNG).…”

Section: Spark Ignition Combustionmentioning

confidence: 98%

“…However, three-phase linear alternators are more complex and expensive than single-phase linear alternators. Many researchers have used three-phase linear alternators for highpower FPLEs [30,40,52], whereas they've found single-phase linear alternators suitable for small power FPLEs [53][54][55]. The various arrangements of magnets also differentiate various types of linear alternators, including moving-magnet, moving-iron, and moving-coil linear alternators [56], as shown in Fig.…”

Section: Kinds Of Linear Alternatorsmentioning

confidence: 98%

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A review of free-piston linear engines

2016

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Section: Spark Ignition Combustionmentioning

confidence: 98%

Section: Kinds Of Linear Alternatorsmentioning

confidence: 98%

A review of free-piston linear engines

2016

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“…These works pave the way for the analytical analysis of conventional mover-magnet PMLMs. The three-phase axially magnetised tubular PMLM is designed and manufactured for free-piston engine, and some critical structural parameters are selected to optimise the machine performance [16,17]. For a high-force-density tubular PMLM, the analysis results show that partial irreversible demagnetisation occurs under the peak load conditions [18], and the PM demagnetisation which is assessed for a three-phase Halbach-magnetised tubular PMLM shows that partial irreversible demagnetisation exists in both the no-load and maximum-load conditions [19].…”

Section: Introductionmentioning

confidence: 99%

Tubular unified magnetic‐field flux‐switching PMLM for free‐piston energy converter

Sui

Zheng

Liu

et al. 2019

IET Electric Power Applications

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A tubular flux-switching permanent-magnet linear machine (PMLM), which features unified magnetic field between the mover and two stators, is investigated for free-piston energy converter. The topology evolution, topology, operating principle and design considerations of the machine are thoroughly analysed. With the sinusoidal speed characteristic of free-piston Stirling engine considered, a tubular unified magnetic-field flux-switching PMLM is designed by finite-element analysis. Several main structural parameters, which include the outer and inner radius of the mover, the mover tooth width, the magnet thickness, the tooth widths of both the outer and inner stators and the widths of both the outer and inner stator yokes are studied to achieve high-force and mass-power density. Finally, the proposed machine is compared with two typical flux-switching PMLMs. The comparison results show that the unified magnetic-field flux-switching PMLM is suitable for applications which require highpower density, light mover structure and fast dynamic.

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“…For example, in [5] the effective stroke length is 62 mm. In studies [2,[6][7][8][9][10], it has been shown that the free piston mechanism and the crank connecting mechanism exhibit a very similar movement profile. Newer forms of ICE, including the free piston system [11][12][13], are being investigated as multi-fuel, high efficiency, low emission options.…”

mentioning

confidence: 99%

Analysis and testing of internal combustion engine driven linear alternator

Arslan

Mellah²

2023

Electrical Engineering & Electromechanics

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Introduction. Internal combustion engine technology has been considered for the alternator system in the last two decades. Especially when considering fuel diversity, reliability, portability, power density, research studies are increasing day by day. In this respect, interest has been focused on linear generator studies. Purpose. The goal of the research is to investigate the performance of a linear generator and its application to generate electrical energy from an internal combustion engine to solve the range problem of small electric powered vehicles. The generator, unlike a traditional generator, consists of a linear generator with a crank mechanism driven by an internal combustion engine. Originality. The configuration of the linear generator with internal combustion engine crank has not previously been reported. Methods. The numerical solution of the generator was carried out by the finite element method in the Ansys Maxwell software in a cylindrical coordinate system. The effect of stroke length and frequency on voltage and output power was investigated by monitoring an external electrical load. A prototype linear generator has been designed and produced considering the sizing dimensions. The configuration can be used in power-hungry applications and increase the range of small electric vehicles. Results. The results from simulation and practice are largely in agreement. Practical value. A practical mechanical system was built comprising a linear generator connected to a 2.2 kW internal combustion engine via a crank connecting rod for analysis.

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Analysis of tubular-type linear generator for free-piston engine

Cited by 6 publications

References 1 publication

A review of free-piston linear engines

A review of free-piston linear engines

Tubular unified magnetic‐field flux‐switching PMLM for free‐piston energy converter

Analysis and testing of internal combustion engine driven linear alternator

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