In the first part of this paper, a new type of profiled rotor that rotates a working machine is presented. The machine is able to function either clean or with a suspension fluid. The aim of this work is to study the strength needed to overcome the viscous friction of two pairs of surfaces: between the case and the top of the piston and between the walls of the case and the rotor side surface. This paper includes a graphical presentation of the power consumption in both cases. The final part of this paper highlights the advantages of rotating machines with two profiled rotors. A reference list, which highlights the ongoing research into rotating machines with profiled rotors, concludes this paper.