A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

Sun, Yu; Xu, Zhaoping; Liu, Liang

doi:10.1109/access.2020.2988696

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…Note that self‐inductance is high and mutual inductance is low. Output power can be increased by compensating inductance with a series capacitor [9–41].…”

Section: Linear Generator Design and Optimizationmentioning

confidence: 99%

Linear generator design for concentrating solar power technologies: Optimization and prototype development

Arslan,

Akkaya Oy

2023

IET Renewable Power Gen

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An alternative way to generate electricity from solar energy is through the use of generators comprising Stirling engines with a parabolic collector. This study describes a parabolic collector with Stirling engine and investigates the design of a linear mobile generator for these systems. Especially for direct drive in free piston mechanisms proposed for these systems, linear generators are important due to their advantages such as compact structure, light weight, high efficiency and high power intensity. Although conventional one‐phase and three‐phase multi slot/pole models are widely available in the literature, three phase is considered for lower PM cost and to reduce the cost of power electronics and 3/2 slot/pole combination is considered for high speed and frequency. In this study, a new 3/2 slot/pole three‐phase tube‐type linear generator was designed and evaluated for performance and manufacturability. Objective functions were defined for power and efficiency increase to reduce generator power ripple, and the results of Mixed‐Integer Sequential Quadratic Programming, Multi‐Objective Genetic Algorithm (MOGA), and Screening methods were compared and examined. Performance of the two‐dimensional and optimized models was evaluated in terms of induced voltage, power density, efficiency, and output power. The best results were found with MOGA compared to other methods. When compared with the initial value, there was a 97.3% increase in power density for a 32.4% increase in moving weight. Moreover, the efficiency of the MOGA model is improved by 16.2% compared with the initial model. Additionally, significant improvements were shown in terms of thrust coefficient, voltage coefficient, power, and no‐load voltage. A prototype of the model was made and a motor‐driven crank mechanism system was used in place of the Stirling engine to undertake practical measurements.

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“…Note that self‐inductance is high and mutual inductance is low. Output power can be increased by compensating inductance with a series capacitor [9–41].…”

Section: Linear Generator Design and Optimizationmentioning

confidence: 99%

Linear generator design for concentrating solar power technologies: Optimization and prototype development

Arslan,

Akkaya Oy

2023

IET Renewable Power Gen

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“…A plate moving-magnet LG in Nanjing University of Science and Technology: (a) 3-D structure of LG and (b) prototype of LG. 109 …”

Section: Advancement Of Linear Generatorsmentioning

confidence: 99%

“…This prototype had a low mover mass of 1.4 kg, an output power of 2 kW, and an efficiency of 95%. 109 In the last two prototypes discussed, PM was used as the supporting material; therefore, the mover’s structural strength should be further analysed. The Chinese Academy of Sciences presented the double-side quasi-Halbach arranged PMs for high air-gap magnetic flux density.…”

Section: Advancement Of Linear Generatorsmentioning

confidence: 99%

Recent progress on performance and control of linear engine generator

Ngwaka

Chen

Qiu

et al. 2022

International Journal of Engine Research

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Linear engines, or widely called free piston engines, have their advantages compared to conventional engines with crankshafts, for example, lower friction loss, compact structure, fuel adaptability, flexible compression ratio, etc. Among the linear engine conceptual designs and prototypes, Linear Engine Generator (LEG) incorporating a linear engine (internal or external combustion) and a linear alternator provides an alternative and attractive solution for hybrid electrical powertrains in transport applications. Due to the advantages of linear engines, hydrogen, synthetic hydrogen carrier fuels and biofuels are easier to adopt on LEG, making it an appealing technology for decarbonisation. This paper explicitly reviews LEG research and development on state-of-art solutions and recent progress in linear engine improvement, linear alternator design optimisation, and integrated LEG system control. Key performance indicators of the linear engine generator, like power output, thermal and electrical efficiency, etc., are summarised to present a general picture of up-to-date LEG development. Recommendations for further LEG development are provided at the end of the paper regarding the review outcomes.

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“…L INEAR machines have been and continue to be viable candidates in several industrial fields where they exhibit higher performance than their rotating counterparts. They are integrated in wave energy conversion systems [1]- [4], Maglev trains [5]- [7], ropeless elevators [8], [9], electromagnetic suspensions [10], [11], and free piston engines [12]- [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of the Pole Shoe Geometry on the IPM T-LSM Features: Application to Free Piston Engines

Souissi

Abdennadher²,

Masmoudi³

2022

IEEE Access

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The paper is aimed at an analytical approach dedicated to the investigation of the effects of the pole shoe geometry on the no-load flux features of inner permanent magnet tubular-linear synchronous machines (IPM T-LSMs). It considers the most common geometries: (i) rectangular pole shoes, and (ii) trapezoidal pole shoes. The proposed approach combines two analytical models which are the magnetic equivalent circuit (MEC) and the permeance function. First, a basic MEC of an elementary part of the machine is considered to predict a preliminary air gap flux density trapezoidal waveform. Then, the accuracy of the proposed approach is enhanced by the incorporation of a mover permeance function that accounts for the PM spoke-type arrangement. The proposed approach is applied to the investigation of the impact of the mover pole shoe shape on the air gap flux density. The developed pole shoe sizing procedure makes it possible the selection of an IPM T-LSM with an appropriate mover geometry for which an investigation of the no-and on-load features is carried out by finite element analysis. The prototyping of the selected topology enables the experimental validation of the back-EMF and the load characteristic.INDEX TERMS Tubular-linear synchronous machines, inner permanent magnets, mover pole shoes, magnetic equivalent circuit, mover permeance function, no-load air gap flux density, back-EMF, cogging force, finite element analysis.

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A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

Cited by 12 publications

References 28 publications

Linear generator design for concentrating solar power technologies: Optimization and prototype development

Linear generator design for concentrating solar power technologies: Optimization and prototype development

Recent progress on performance and control of linear engine generator

Investigation of the Effects of the Pole Shoe Geometry on the IPM T-LSM Features: Application to Free Piston Engines

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