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The Free-Piston Linear Generator (FPLG), is a free-piston engine coupled with a linear alternator. It converts chemical energy from fuel into electric energy. Because of its versatility, low weight and good efficiency, it can be used in a wide range of applications, although it is of special interest of the mobility industry as range extenders for electric vehicles. == Description == The free-piston engine linear generators can be divided in 3 subsystems: * One (or more) combustion chamber with a single or two opposite pistons * One (or more) linear electric generator, which is composed of a static part (the stator) and a moving part (the magnets) connected to the connection rod. * One (or more) return unit to push the piston back due the lack of the crankshaft (typically a gas spring or an opposed combustion chamber) The FPLG has many potential advantages compared to traditional electric generator powered by an internal combustion engine. One of the main advantages of the FPLG comes from the absence of crankshaft. It leads to a smaller and lighter engine with fewer parts. This also allows a variable compression ratio, which makes it possible to design an engine that works ideally with different kinds of fuel. The linear generator also allows to control the resistance force, and therefore a better control of the pistons movement of and the combustion. The total efficiency (including engine and generator) of free-piston linear generators are around 40%,〔Sven-Erik Pohl: ''Der Freikolbenlineargenerator - Theoretische Betrachtungen des Gesamtsystems und experimentelle Untersuchungen zum Teilsystem der Gasfeder'', Helmut-Schmidt-Universität, Hamburg, 2007〕〔Cornelius Ferrari: ''Entwicklung und Untersuchung eines Freikolbenlineargenerators unter besonderer Berücksichtigung des verbrennungsmotorischen Teilsystems mit Hilfe eines neuartigen vollvariablen Prüfstands'', Universität Stuttgart, Stuttgart 2012〕 which is a significant improvement compared to conventional combustion engines. The latters reach about 20% under typical US driving conditions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Free-piston linear generator」の詳細全文を読む スポンサード リンク
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