training system for motor vehicle with electric group whose rotor is connected to the flywheel by a zone has reduced thermal conductivity

A drive system (10), in particular for a motor vehicle, comprises a drive shaft (12) with an inertial mass arrangement (24) provided on this shaft, an electric machine (48) whereby the drive shaft (12) can be rotated and / or electrical energy can be recovered during the rotation of the drive shaft (12). The electric machine (48) comprises a stator (46) and a rotor (34 54) in rotation with the drive shaft (12) and the rotor (54) is connected to the drive shaft (12) through the inertia mass (24). The rotor (54) is connected to the inertia mass (24) by a connecting region (62) which has an increased resistance to thermal conductivity vis-a-vis at least one adjacent zone (60, 82).