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Volkswagen ID series: New drive with more efficiency and performance
Finally, the ID family lives up to full brand virtues: With the announcement of a more efficient drive, the VW Group is eliminating perhaps the biggest drawback of its E-models – the only average efficiency of the units, which resulted in rather poor range. The electric drive of the ID family is to offer more efficiency and even better performance in the next generation as a rear-wheel drive "APP550" with a completely newly developed unit, although there was no such urgent need for action here.
The first vehicles with the new generation in a 210 kW variant are expected to be delivered by Wolfsburg by the end of the year, according to the announcement. The conceptual framework for the new electric drive remains the Modular Electric Drive Matrix (MEB), the vehicle platform specifically tailored to electric models, according to Lower Saxony.
"The installation space has not changed. So the task was to develop a new drive that achieves significant improvements in performance and efficiency despite the same framework conditions. A great challenge for the Technical Development team and Group Components. The result shows that in addition to significantly increased vehicle efficiency, we were also able to reduce the use of raw materials," specifies Karsten Bennewitz, Head of Drive and Energy Systems in Technical Development.
The output of the new unit is 210 kW (286 PS) with a maximum torque of around 550 Nm – depending on the vehicle's gear ratio. In particular, the significantly increased torque is said to provide even more sovereign power delivery – from a standstill as well as at higher speeds, according to the promise. The higher torque is made possible by a further developed stator with a high effective number of windings and a larger wire cross-section. The rotor, as its counterpart, is equipped with a stronger and more load-bearing permanent magnet. The drive was reinforced in design for the resulting torques, explains the manufacturer.
Pulse Inverter Delivers High Currents
The decisive factor for the performance of an electric drive is the current strength, so the pulse inverter (PWR) was developed as a key component to enhance power and efficiency. It is intended to form the controlling "brain" of the drive, with its functional software ensuring efficient processes within the system. This relates to variables such as clock frequencies and modulation methods in the generation of alternating current for the electric motor. Consequently, the motor can operate more efficiently depending on the load phase, the manufacturer advertises.
Optimized Thermal Management through Intelligent Cooling
To increase the efficiency of the electric drive, engineers optimized several components within the unit, including the thermal management. The new drive features an energy-saving cooling system that operates without an electrically driven oil pump. The system can autonomously cool itself through the gears of the transmission and specially shaped components for the guidance and distribution of the oil. The heated oil is cooled by the vehicle's cooling circuit, keeping the drive at operating temperature, according to the Wolfsburg team. The exterior of the stator is equipped with a water cooling jacket.
Kassel as the Center for the Electric Drivetrain
The production of the drive with transmission, rotor, and stator takes place at the Volkswagen Group Components location in Kassel. Alexander Krick, responsible for the development of electric drives, power electronics, and transmissions in Group Components, promotes the development of electric machines that has been happening here for 15 years, including their transmissions. Production has been ongoing at the location for over 10 years. Product and process innovations in electric machines and transmissions are now expected to bring a significant increase in efficiency and performance.
Translated automatically from German.“With our many years of experience, we have optimized the entire system, for example through the use of special electrical sheets or unique processing methods, and have thus been able to significantly increase efficiency.”
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