A turbomachine has a housing defining an axis and having an axially outwardly directed first end wall. A shaft rotatable about the axis inside the housing has a first end projecting axially from the housing. An electric rotor is provided on the shaft, and an electric stator is provided on the housing juxtaposed with the electric rotor. A radial impeller fixed on the first shaft end outside the housing has an inner face directed axially toward the housing end wall. A magnetic bearing half is fixed on the housing end wall immediately adjacent and directed at the impeller inner face.