Progressive cavity transducer

A progressing cavity fluid motor assembly comprising a plurality of separate stator elements, an internal helical groove in the internal surface of said stator elements, tubular means to connect the output end of one of said stator elements with the input end of an adjacent stator element in series into a continuous fluid passageway, a helical rotor element in each stator element, means to connect said rotor elements in said tubular means into a rotor assembly for simultaneous rotation, a fluid flow connection to the first of said stator elements in said series, a fluid flow connection to the last of said stator elements in said series, the pitch of said stator groove (Ps) being twice the pitch of the rotor (Pr), and in which each of said rotor elements is adapted to move in a rotary and eccentric motion, in the stator elements, a shaft, bearing for said shaft, a universal joint between one end of said rotor assembly and said shaft, the other end of said rotor assembly being free.