Electrically assisted turbocharger

The present invention relates to an electrically assisted turbocharger device comprising a turbocharger composed of at least one turbine and a compressor, and an electric machine providing electrical assistance. The electric machine (20, 21) is of the asynchronous disc type comprising: a stator (20) disposed on the upstream or downstream side of the compressor, this stator comprising windings to generate a stator rotating field and a stator magnetic circuit receiving said windings, and a rotor (19, 21) constituted by the compressor wheel (19) made of a non-magnetic electrically conductive material. The use of an asynchronous machine avoids the integration of magnets which can increase the inertia of the compressor wheel and generate mechanical stresses.