Patent ID: 7291943

Claim:
Electromechanical energy converter for a gaseous for vaporous medium comprising a stator ( 1 ) with two pot-shaped stator members ( 1 a , 1 b ), each open at one end face and adjoining each other at these end faces with mirror symmetry along a plane of symmetry ( 6 ), said stator members surrounding a working space ( 12 ) and forming a common magnetically permeated air gap ( 7 ), a coreless armature coil ( 25 ) displaceably arranged in the air gap ( 7 ), a freely oscillating piston ( 14 ) arranged in the working space ( 12 ) linked to the armature coil ( 25 ), at least one source ( 21 a , 21 b ) for the medium, two reaction chambers ( 61 a , 66 a ; 61 b , 66 b ) each assigned to a head ( 15 a , 15 b ; 41 a , 41 b ) of the piston ( 14 ) and control means ( 17 a , 19 a , 22 a , 23 a , 47 a ; 17 b , 19 b , 22 b , 23 b , 47 b ) assigned to the reaction chambers ( 61 a , 66 a ; 61 b , 66 b ) for self-control of the piston oscillations, and by means of which the reaction chambers ( 61 a , 66 a , 61 b , 66 b ) may be opened to the source ( 21 a , 21 b ) during the piston oscillations for accepting medium under pressure, and to the working space ( 12 ) for releasing expanded medium, wherein the stator members ( 1 a , 1 b ) are formed with rotational symmetry about a longitudinal axis ( 2 ) of the piston ( 14 ), wherein the central pole pieces ( 3 ) are each provided with a passageway ( 9 ) coaxial with the longitudinal axis ( 2 ), surrounding the working space and accommodating the piston ( 14 ) and the armature coil ( 25 ) is linked to the piston ( 14 ) via radial, inwardly projecting webs ( 24 ), wherein inserted in sealed manner in every passageway ( 9 ) is a closed cylinder section ( 16 a , 16 b ) coaxial with the longitudinal axis ( 2 ) and closed to the outside with a cover ( 10 a , 10 b ) and the piston ( 14 ) is provided on each of its ends with a piston head ( 15 a , 15 b ; 41 a , 41 b ) in an assigned cylinder section ( 16 a , 16 b ) sealed and displaceably mounted, such that between each of the covers ( 10 a , 10 b ) and the associated piston head ( 15 a , 15 b ; 41 a , 41 b ), a compression chamber comprising the source ( 21 a , 21 b ) of the gaseous or vaporous medium comes into existence, and wherein the two compression chambers ( 21 a , 21 b ) are linked together so as to permit flow, via a hollow space ( 45 ) passing through the working piston ( 14 ).