commercialization status of free piston stirling machines neill w lane sunpower inc usa abstract after many years engineering and market development some are now available commercially these successes presage other such products based on that will likely enter the over coming this paper describes s beta type machine technology its attributes relative to kinematic typical performance data for is presented background in response short comings conventional engine william beale invented fpse 1964 1 all no matter what arrangement face a number very significant design challenges which may be so great as prevent any commercial success include requirement long lived non contact bearings seals difficulty sealing pressurizing need lubrication separate lubricant from heat exchangers modulation control promise has been hermetically sealed near fixed frequency device operating mode providing
