is virtually maintenance free quiet and efficient in accordance with the principle of the traveling wave pump no seals on moving parts are needed since little friction occurs between the cam 10 and diaphragm assembly 11 the components involved are hardly subject to wear as this pump arrangement can work by displacement or as a flow pump e g via adjustable cam height a wide range of pressure levels for example in the range from 10 mbar to 20 bar can be realized further a not shown means for providing a variable magnetic field is provided fig6 shows a further development of the arrangement with two independent media circulations via another concentric membrane assembly 14 and another cam 15 via the connections 16 and 17 another media circuit can operate furthermore fig6 shows that the membrane assemblies 11 and 14 would also be possible in different cross sections widths heights therewith for example the different radial rotational speeds of the cam can be compensated to achieve the same flow rates in both circuits however other mixed modes with different flow rates or pressure levels can be realized similarly further in particular concentric arrangements for other circuits are conceivable and possible fig7 shows a further development of the previous arrangement for a symmetrical two sided designed axial flow which as stated above can be realized in different variants fig8 shows radially a circumferentially segmented arrangement segmentation can be implemented in any number and shape fig9 shows an arrangement with a plurality of cams per orbit any number and shape imaginable fig1 shows analogous conceivable positions of membrane assemblies in a permanent magnet synchronous machine according.