We in the Subteam Electric Drivetrain provide for our electric racing car the necessary propulsion. At the same time, we are facing the same challenges as the automotive industry: from energy storage and energy conversion to motorization.
Engine, Gearbox and Test Stand
We drive an all-wheel concept with four central engines. The electric motors are self-developed permanent-magnet synchronous three-phase motors, which were developed in cooperation with the Electrotechnical Institute (ETI) at KIT as part of graduation theses and then further optimized.
So that we can constantly improve our engines, we have an electric motor test bench with transient operation. This allows us to test the cooling and efficiency of our engines and to measure the engine maps. In addition, we can map the vehicle electronics here and thus ensure comparable test conditions.
Battery and Power Electronics
The battery is the energy storage and central element of our electric vehicle. With a self-developed Battery Management System (BMS), it covers a large share of the total weight of the vehicle, which is why it must be installed as deep as possible. We manufacture our battery from 280 individual LiPo cells ourselves and reach an operating voltage of over 580 volts. The possibility of energy recovery during braking helps us to increase the efficiency of the vehicle and to save weight.
The power electronics form the interface between the battery and the motors. It regulates the applied currents and voltages on the motors and thus the output power, depending on the driver's requirement. We have also developed and manufactured these ourselves in the 2016 season as part of a number of theses.
Safety and Cooling System
In our racing car, we install a series of monitoring, maintenance and diagnostic devices to detect potential errors. In addition, we prevent overheating by active cooling of the battery, the power electronics, and the motors.
Since the 2015 season our electric car is characterized by the so-called Dual-X-Drive. This is due to the arrangement of our engine-gear unit and its rotation about two axes in the vehicle to minimize losses in the drive train.