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.

POWER DISTRIBUTION

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

include:

Texas Instruments InstaSPIN-FOC

Texas Instruments TMS320F28027F 32-bit

microcontroller

I2C communication

Very low Rds(ON) MOSFETS (<2 mΩ)

PROJECT OUTCOME: Vehicle is electrically fully operational. Construction of vehicle chassis

in progress by mechanical team. Further testing and optimisation

required over the summer in preparation for the 2017 competition.

ELECTRICAL PROJECT TEAM:

Byron Engler Jack Hendrikz

Frank Sullivan Cam Thompson

PROJECT SUPERVISORS:

Dr. Patrick Geoghegan

Dr. Andrew Lapthorn

Bruce Robertson

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