The drive system has a planetary gear (11,12), a ring gear (114,124), multiple planetary gears (113,123), a planetary carrier (112,122) and a sun gear (111,121). A gear unit is assigned to a shaft, which is provided with a coupling flange (14). The coupling flange is connected with a working machine or rotor shaft. A rotor (22) of a motor- or generator unit (2) is connected with a rotor hollow shaft (23). A motor or generator-side end section of another shaft (16) of the gear unit is surrounded by the rotor hollow shaft in concentric manner.