Design and analysis of 5 kw class tubular type linear generator for free-piston engine

Lim, Jaewon; Hong, Sun-Ki; Jung, Hyun-Kyo

doi:10.3233/jae-2011-1334

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…Lim et al simulated the back EMF and the cogging forces of a tubular-type linear generator using the finite element method and the Fourier series expansion. They found that the proper pole pitch modulation could reduce the cogging force and increase the back EMF [45]. Abdalla et al compared the effects of various translator velocities and three different ferromagnetic materials for the stator core, namely, silicon steel laminations, mild steel, and Somaloy on the cogging force of the PMLG.…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Wei,

Zuo,

Jia

et al. 2024

International Journal of Energy Research

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Renewable fuels attract more attention owing to reduction of both air pollution and greenhouse gas emissions compared to fossil fuels. The free-piston engine generator is a new energy conversion with compact structure, multifuel combustion mode possibility, and less friction loss, and it can be applied to a variety of renewable fuels. This study investigated the effect of operating parameters on power generation and motion characteristics for free-piston engine generator. A test bench and a detailed and validated numerical model of the free-piston engine generator were presented. Results show that with the increase of the average velocity, the output power root mean square (RMS) and efficiency of the generator gradually increase. The output power RMS grows rapidly, whereas the generator efficiency gradually stabilizes. Under the same average velocity but different strokes and frequencies, the generator power and efficiency are the same. This result means that the multiple-point operating condition can achieve the same output power and generator efficiency goals. Moreover, the optimal operating conditions can be selected comprehensively, considering factors such as fuel properties, combustion efficiency, and performance. The influence of the generator on motion characteristics of the system under pure resistive load and high-frequency operation should be noted.

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Section: Introductionmentioning

confidence: 99%

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Wei,

Zuo,

Jia

et al. 2024

International Journal of Energy Research

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“…Wang and Howe [15], Chen et al [16], and Wang et al [17] analyzed the electromagnetic characteristic of permanent magnet linear generator (PMLG), and improved generator performance by changing structural parameters such as ratio of stator and mover to outer diameter. Lim et al [18] and Hlaing and Myint [19] studied the influence of pitch on generator detent force, on the basis of the electromagnetic calculation of the piston type tubular linear generator. They found that reasonable adjustment distance can reduce the cogging force and improve generator performance results.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Characteristics of Permanent Magnet Linear Generator (PMLG) Applied to Free-Piston Engine (FPE)

Zhao

Wang

et al. 2019

IEEE Access

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The electromagnetic characteristics of the permanent magnet linear generator (PMLG), which is the key components of the free-piston engine (FPE), are studied in this paper. First of all, the velocity, displacement, and output voltage of the flat-type linear generator used in the experimental platform in the half-motion cycle are simulated by the model of 3D electromagnetic field and verified by experiment, and the relation curves of the output voltage to running velocity are found. Then, the PMLG is re-designed as a tubular type with two different structures of the permanent magnet on the steel backing of the mover: rectangular and the I-shaped. Third, the new PMLGs are modeled, and the models are used to do a simulation to investigate the influence of the structure of permanent magnet on the electromagnetic characteristics under no-load and load conditions. It is found that the fundamental wave amplitude of the flux density in the air gap of Ishaped PMLG is 0.93 T, greater than the rectangular one (0.87 T), and the proportion of the fundamental wave is higher. The waveform of the no-load induced electromotive force of the I-shaped PMLG is much better than that of the rectangular one, and the voltage total harmonic distortion (VTHD) is only 3.05%. The detent force analysis shows that the permanent magnet shape has a great influence on the detent force, and the peak value of detent force between I-shaped and rectangular PMLGs is significantly decreased from 25.4 to 7.75N. Moreover, the relation of the generator output power-velocity and efficiency-velocity under different loads is found. When the load is constant, with the velocity increases, the difference of output power between the I-shaped and rectangular structures becomes bigger. The optimum range of running velocity of the generator with the higher efficiency under different loads is presented. In conclusion, the I-shaped structure of the permanent magnet is a better choice for FPE.INDEX TERMS Free-piston engine, optimum range of running velocity, permanent magnet linear generator, structures of permanent magnet structure, voltage total harmonic distortion.

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“…Kim and Choi 10 carried out a feasibility study for a self-powered wireless emergency call button using an electromagnetic energy harvesting mechanism. Lim et al 11 developed a tubular electromagnetic linear generator. Linear electromagnetic generators could be useful for harvesting vibration energy in various industries.…”

Section: Introductionmentioning

confidence: 99%

Linear electromagnetic electric generator for harvesting vibration energy at frequencies more than 50 Hz

Cho

Kim

2017

Advances in Mechanical Engineering

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This study proposes a linear electromagnetic generator that can harvest vibration energy from a transformer and supply electricity to a monitoring system. The sensor system delivers voltage and electricity information from a transformer and it usually requires a battery that must be replaced periodically. These result in high costs, working hours, and manpower, and workers may sometimes face very dangerous situations, especially when a transformer is located in a mountainous area or an elevated position that cannot be accessed easily. The transformer vibrates at a frequency of approximately 50 Hz or higher. In this study, a linear electromagnetic generator was designed to analyze and harvest this vibration energy. A prototype was produced and its performance was tested, which showed that more than 100 mW of electricity could be produced, which is the minimum amount required for the electricity analysis system.

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Design and analysis of 5 kw class tubular type linear generator for free-piston engine

Cited by 11 publications

References 2 publications

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Electromagnetic Characteristics of Permanent Magnet Linear Generator (PMLG) Applied to Free-Piston Engine (FPE)

Linear electromagnetic electric generator for harvesting vibration energy at frequencies more than 50 Hz

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