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ELECTRIC DRIVETRAIN & PERIPHERIALS
BATTERY & BATTERY MANAGEMENT
SYSTEM 48 lithium ion Samsung INR18650 cells. The cells are
connected 4 in parallel 12 in series giving a battery
output of 43.2V and 4.32 Ahr.
Orion BMS Jr. equipped with cell over-voltage, under-
voltage, over-current, and over-temperature protection.
It also actively balances cells when charging.
SYSTEM The vehicle power distribution delivers energy to the system
components only when instructed and safe to do so. Each
individual component of the power system is fused for
overload and short circuit protection.
VEHICLE COMMUNCATION Communication between modules allow data transfer.
This allows for real time feedback from motor controller
and BMS to be displayed on the steering mounted
OLED screen. Micro SD data logging at rear of
vehicle with benefits of optimising both
driver and vehicle efficiency.
VEHICLE GEARBOX Power transfer between motor and wheel
requires a 12:1 reduction. The motor,
which spins up to 6000 rpm must give a
peak torque of 30 Nm at the wheel. Two
stages of roller chain reduction are used
for an efficient, compact drive system.
SYSTEM PERIHEPRALS Several electrical peripherals are required to meet competition technical inspection and
to emulate current on-road vehicles.
Full lighting system including headlights, indicators, and brake lights.
Functioning windscreen wiper system.
High tone car horn.
The switching of these functions are positioned on a quick release steering wheel along
with the dead-man switch and emergency stop.
PROJECT OUTLINE: The Shell Eco-marathon challenges young engineers from around
the world to design, build, and drive energy-efficient vehicles. Our
vehicle will compete at the Shell Eco-Marathon in March 2017.
MOTOR CONTROLLER For efficient electric propulsion, a Brushless DC
motor from Scorpion Power Systems was
selected. Features of the motor controller
Texas Instruments InstaSPIN-FOC
Texas Instruments TMS320F28027F 32-bit
Very low Rds(ON) MOSFETS (