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DUSC

The Design of the Durham University Solar-Powered Car. DUSC. Development of high-performance solar car Good match for Durham School of Engineering Vehicle Design and Development. Introduction. Vehicle Design. SUN. Solar Cells. MPPT. 3–200V DC. 3–200V AC var freq. 42 – 59 VDC.

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DUSC

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  1. The Design of the Durham University Solar-Powered Car DUSC

  2. Development of high-performance solar car Good match for Durham School of Engineering Vehicle Design and Development Introduction

  3. Vehicle Design

  4. SUN Solar Cells MPPT 3–200V DC 3–200V AC var freq 42 – 59 VDC DC-DC Converter Inverter Drive Wheel Motor Solar Cells MPPT Battery Module multiple units multiple units in parallel Vehicle Design - Electrical

  5. Vehicle Design - Electrical • Solar Cells • Use energy from the sun to generate electricity • Maximum power from the sun ~1000 W/m2 • Solar cell efficiency ~16% • Area of solar panels • = 1.8 m x 5 m • = 9 m2 • Power • = 1000 W/m2 x 0.16 x 9m2 • = 1440 Watts

  6. Vehicle Design - Electrical • Maximum Power Point Trackers (MPPTs) • Power = Voltage x Current • Voltage and Current from cell both depend on sun! • Sometimes voltage from cell < battery voltage • MPPTs provide the optimum resistance to the solar cells for maximum power

  7. Vehicle Design - Electrical • Motor • Direct-drive: no gearbox loss • High-torque / low-speed • Axial flux “pancake” • Integrated into rear wheel • 1.8kW, effy ~ 95% • Can also act as brake • Has potential to be used for real vehicles

  8. Vehicle Design - Electrical • Batteries • 4 sealed gel lead acid batteries (125 kg total) • 48V - 5kWh capacity •  energy collected during typical day in UK summer • Charge all day, drive for 2 hours at high speed • Technical Partner • C&D Technologies

  9. Vehicle Design - Mechanical • Aerodynamic Design • Aerodynamic drag increases with velocity squared • Rolling resistance does not change with speed • Aero drag dominates power consumption at high speed • Computer simulations (CFD) • 10% scale parametric models • Target CDA ~0.1m2

  10. Vehicle Design - Mechanical • Chassis Design • Low mass (30kg) • low Factor of Safety • detailed analysis • Computer simulations (FEA) • Steel space frame • Composite body shell • On-road testing • verify design loads • validate simulation

  11. The Way Forward • (N)ASC July 2005, July 2007? • WSC Sept 2005, Sept 2007 • Jobs to do: • Recruit sponsors • Spent £45,000 to date • Need £17,000+ for spares etc, £20,000 for WSC • Website • Tune chassis / improve bodyshell • Power electronics for drive motor • Solar cell encapsulation etc • Telemetry?

  12. The Design of the Durham University Solar-Powered Car DUSC

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