Free-piston engine used as a gas generator to drive a turbine
Figure 1 of US1657641

Essentially a linear motor used as an electrical generator.

- Linear alternator

A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

- Free-piston engine

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