Rotary machine with motor embedded in the rotor

A rotary machine comprising a housing (11) provided with two intersecting bores (12,13), one rotatable lobed rotor (14,15) in each bore, said rotors meshing with one another and arranged for pumping a working fluid from a low pressure opening (16) to a high pressure opening (17) or for being driven by a working fluid, characterized in that a number of electrical windings (18,19) are provided in the wall of each bore, that an inverter is connected to said windings to sequentially energize the windings of each bore wall to create a rotating magnetic field in each bore, whereby said rotors (14,15) are rotated or to generate a voltage when the rotors are rotated by the working fluid, and in that the rotor lobes (39, 40) extend helically about the axis of the rotor and that the electrical windings (19, 18) in the walls of the bores (12, 13) have a pitch angle corresponding to the pitch angle of the lobes of respective rotor.