According to Volkswagen, the APP550 electric drive achieves its high torque thanks to an enhanced stator with a higher effective number of windings and a larger wire cross-section. The rotor as its counterpart is equipped with a powerful permanent magnet that has a high load capacity. The drive was also reinforced to withstand the considerable torques produced.
The current is a decisive factor for the power of an electric drive. As a further important component, the inverter was developed so that it is able to supply the high phase currents needed for greater power and efficiency. It acts as the controlling “brain” in the powertrain whose functional software ensures efficient system processes. This applies to the clock frequencies and the modulation methods for generation of the alternating current for the electric drive motor, for example. The drive motor can therefore operate more efficiently, depending on the load phase.
In order to increase the efficiency of the electric drive, Volkswagen optimised a number of components in the powertrain, including the thermal management system. The new drive therefore has an energy-saving cooling system that operates without an electrically driven oil pump. The system is able to independently cool itself via the gear wheels of the gearbox and specially formed components for oil supply and distribution. The heated oil is cooled by the vehicle’s coolant circuit, which keeps the drive at operating temperature. The outside of the stator is equipped with a water heat sink.
The drive system with gearbox, rotor and stator will be produced at the Volkswagen Group Components plant in Kassel, Germany. Volkswagen is planning to deliver the first vehicles with the new drive generation in a 210 kW (286 PS) version from the end of the year. It’s expected to be used in the ID.7, which debuts on April 17th.
Source: Volkswagen