Audi has released technical details regarding the electric drive system powering the new Audi A2 e-tron. Designated as the brand’s most efficient model to date, the electric compact car utilizes a heavily revised version of the Volkswagen Group’s Modular Electric Drive Matrix (MEB) components, aiming to minimize energy consumption while improving acoustic comfort and power delivery.
Optimized APP350 Motor and Performance Levels
At the rear of the Audi A2 e-tron sits a permanent-magnet synchronous motor operating at a 400-volt level and positioned parallel to the axle. Delivering up to 350 Nm of torque, the upgraded APP350 unit is offered in three distinct performance tiers, utilizing output-specific gear ratios including i=10.21 for the 125 kW and 140 kW variants, and i=11.53 for the 170 kW variant.
Engineering modifications to the motor include reducing rotor lamination thickness by more than 30 percent compared to the predecessor APP310 drive, which lowers iron losses during remagnetization. Additionally, the rotor segments are arranged in a staggered pattern to eliminate first-order vibrations and reduce cabin noise. Configuring the stator winding in a delta setup rather than a star layout further improves efficiency during partial-load city and rural driving.
Silicon Carbide Power Electronics
The pulse inverter responsible for converting high-voltage direct current (DC) to alternating current (AC) incorporates metal-oxide-semiconductor field-effect transistors (MOSFETs) based on silicon carbide (SiC) rather than standard silicon-based bipolar transistors. These SiC semiconductors reduce switching losses, allowing the inverter to achieve efficiencies exceeding 97 percent.
A newly developed adaptive software strategy modulates the switching frequency according to real-time operating data, cutting energy losses further during medium-speed and partial-load conditions. According to official figures, the 140 kW variant equipped with the optional efficiency package achieves a combined WLTP energy consumption of 12.8 kWh/100 km.
Transmission and Efficiency Refinements
To reduce mechanical drag, the transmission features fine-machined gear teeth that produce smooth tooth flanks and lower friction losses. This precision allows the integration of a specially formulated, low-viscosity transmission oil combined with optimized internal oil routing to curb churning losses within the gear set.
Relevance for European Buyers
For European consumers navigating a market focused heavily on real-world efficiency and operating costs, the technical updates inside the Audi A2 e-tron directly address everyday usability. The emphasis on minimizing partial-load losses in urban environments and rural roads, combined with a verified WLTP consumption metric of 12.8 kWh/100 km for the 140 kW model, provides concrete efficiency data relevant to European driving profiles.
Practical Takeaway
The Audi A2 e-tron introduces targeted mechanical and electronic upgrades to the established MEB platform—notably silicon carbide inverters and a revised APP350 motor architecture—resulting in a rated efficiency of 12.8 kWh/100 km under WLTP testing for the 140 kW variant with the optional efficiency package.
Source: Original report