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Mechanical Drivetrain

  • Motor: self-developed wheel hub motor, all-wheel drive
  • Power: 37 kW per motor
  • Torque: 31 Nm per motor
  • Transmission: self-developed 1.5-stage planetary gear; transmission of 14
  • Cooling: two separate cooling circuits for motors and inverters

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Suspension

  • Wheel suspension: CFRP double wishbone axles
  • Upright: Topology-optimized DMLS structure made of high-strength aluminum (front axle)/ investment cast structure made of AlSi7Mg0.6 (rear axle), integrated transmission mount and motor cooling
  • Spring damper system: Heave-roll decoupled system with air spring on the roll damper, actuated via pushrods
  • Wheel hub: milled aluminum structure from EN AW 7075 T6
  • Brake system: self-developed brake calipers for front and rear axle made of high-strength aluminum
  • Rims: 13" CFRP-rim with aluminium rim star
  • Tires: 13" Continental Slick C20
  • Wheelbase: 1530mm
  • Front and rear track width: 1220mm

Chassis

  • Monocoque structure: Hybrid monocoque with CFRP (middle) or aluminum cover layers (front & rear) as well as aluminum honeycomb and hard foam as core material; magnesium inlays at attachment points
  • Accumulator housing: consisting of CFRP sandwich with aluminum honeycomb core and serial cooling
  • Pedals: Accelerator and brake pedal made of aluminium
  • Safety structures: Main roll hoop made of steel, alumium front roll hoop laminated in monocoque; crashbox made of an aluminum honeycomb and aluminium plate
  • Ergonomics: CFRP seat; CFRP steering wheel; 6-point harness; pedals adjustable to driver size

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Electronics

  • Accumulator: total capacity of 6.9 kWh, 596 V maximum voltage, 284 lithium-polymer cells in a 142s2p connection, self-developed Accumulator Management System (AMS)
  • Power electronics: 2x Lenze-Schmidhauser double inverter 60 kW in the self-developed investment casting housing
  • Low voltage system: Modular system of self-designed circuit boards for:
    • Measured value acquisition
    • Driver interface
    • Vehicle supply
    • Vehicle dynamics control
    • Security systems
    Powered by a 600V to 24V DC/DC converter
    optional tire temperature sensors to optimize the chassis setup
  • Driving dynamics control: consisting of torque vectoring (with yaw rate control), assessment of the vehicle condition, traction control, range control and performance derating and failsafety; cycle time 2 ms

Aerodynamics

  • CFD-optimized vehicle
  • Validated with load cells / flow visualization
  • Coefficient of Lift * A: -5.95 [m^2]
  • Lift / Drag: -3.24
  • Package weight: 16 kg
  • Highlights:
    • Optimization of the monocoque shape for maximum side wing area and underbody downforce
    • Wheel covers, bargeboards and fully covered front gear to control wheel airflow and reduce steering angle sensitivity
    • Front wing and connection optimized for cross flow

Racetech Racing Team TU Bergakademie Freiberg e.V.