Abstract
The linear generator (LG) is integrated into a system that called the free piston linear generator (FPLG). In recent year, free piston engine that is studied by many researchers, has some advantages. Therefore, the application of the line generator in free piston for converting the chemical energy to electrical energy that can be used for plug-in hybrids to extend the range of operations as an alternative energy converter. Therefore, the optimizing of linear generator performance be able to significantly reduce the vehicle's fuel consumption. The parameters in permanent magnet linear electric machine (PMLEM) are designed by Maxwell software and the optimal parameters is carried out via the flux density. To achieve this goal, a linear generator in free piston engine with a flat structure and quasi-Halbach array flux structure was proposed. The simulation of linear generator is performed based on the speed ranges in the New European Driving Cycle (NEDC) for a mid-size car. In the study, a linear electrical machine (LEM) is designed by Maxwell software with translator that has various diameters. The results show that the suitable parameters for stator and rotor about 7.7 mm and 14 mm, respectively. Because the flux density for this design’s stator and rotor yoke avoids saturation state and generates the highest electrical output compared to the other states. Besides, the paper also examined the power output at different frequencies from 15 Hz to 50 Hz, corresponds to a velocity amplitude of 3.6 m/s to 12 m/s. The simulation result shows that the frequencies from 15Hz to 30 Hz with 4.8 m/s to 7.2 m/s (1200 rpm to 2100 rpm), respectively meets engine speed operation ranges in hybrid vehicle and these frequencies produce the power output that increases considerably about 7.5 kW at 30 Hz.
Highlights
Nowadays, many researchers always concentrate on the drawbacks of conventional vehicle such as fossil fuel crisis and global environment problems, their studies focus on the converting the conventional fuel to alternative fuels that has low emissions, high engine performance and efficiency
Hybrid electric vehicle (HEV) that meets about the above problems, it seems to be the best solution for this crisis in this period, whereas the electric vehicle need considerably improvement about battery life and cost
The free piston linear generator (FPLG) power outputs for design are based on the speed configuration of the New European Driving Cycle (NEDC) for a mid-size automobile [5]
Summary
Many researchers always concentrate on the drawbacks of conventional vehicle such as fossil fuel crisis and global environment problems, their studies focus on the converting the conventional fuel to alternative fuels that has low emissions, high engine performance and efficiency. Hybrid electric vehicle (HEV) that meets about the above problems, it seems to be the best solution for this crisis in this period, whereas the electric vehicle need considerably improvement about battery life and cost. These advances in battery technology will be solved in future but hybrid vehicle combine between the conventional engine and electric motor still the best solution on present transportation. The FPLA, which combines the free piston internal combustion engine (FPICE) and the linear alternator (LA), is integrated the advantages of the two parts This machine has only one moving part and suffers less from the friction force in operating. The piston motion is not constrained, some advance technologies as variable compression ratio
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