Asynchronous motors have a decisive advantage for parallel hybrids. If the inverter or motor winding etc. malfunctions, the electric machine will fail but not produce any disturbing influence such as generated voltage, unwanted braking torque, or a fire hazard in the event of short circuits. In the event of malfunction, the combustion engine can therefore still perform its service without the electric machine and thus without the need to mechanically decouple the electric machine either. As a special variant, ARADEX offers so-called DoubleShaft machines. These are asynchronous machines with two shaft ends and shafts that are generously designed to transmit the torque of the combustion engine. This means that parallel hybrids can even manage without an additional gearbox.