Abstract: The invention relates to a device having a polyphase electrical machine, wherein a plurality of inverters (36, 37, 38), which are controlled by an interlaced control modulated by pulse width to an identical cutoff frequency, provide, on the phase outputs thereof, an alternating voltage signal having an identical fundamental frequency, amplitude and phase to an electrical machine (2) that comprises at least two separate so-called star windings (33, 34, 35), each star winding being supplied by a related inverter, each phase output of which is connected to a phase circuit that includes the phase winding of the star winding, the device being characterized in that each phase circuit for a star winding has a negative mutual inductance with the homologous phase circuit of another star winding.

Abstract: The invention relates to a pump including: a gas mixing housing (1); ducts (2, 3) for supplying the housing (1) with HP and IP gases and giving into the mixing housing (1); an outlet duct (3) for the mixed gases; a pneumatic actuator (10) provided in the HP-gas supply duct (2) including a mobile piston connected to a stopper (12) whose position in the duct (2) determines a passage section of the HP gas towards the mixing housing (1); a control chamber (13) of the mobile piston adapted to be fed under pressure for determining the position of the mobile piston; a pneumatic circuit provided between a pressure source and the control chamber (13); characterised in that the pneumatic circuit includes at least one leak valve (22) adapted for generating a leak in the pneumatic circuit for modifying the pressure supplied to the control chamber (13).