Electric turbo-compounding is gaining popularity among hybrid vehicles. This device is composed of an electric machine - mounted on the shaft between the turbine and the compressor - that can operate both as a motor and as a generator. This allows recovering part of the thermal energy that otherwise would be discharged at the exhaust. In this way, the drivability and fuel consumption are improved. In this context, the Research Unit High Efficiency Hybrid Powertrain has been founded to develop new components to increase the efficiency of hybrid vehicles. Politecnico di Torino has been involved to study and design a prototype of a high-speed hysteresis machine for an electric turbo-compound.