The ability of the data logger to measure small changes in voltage provided valuable information in optimising the usage of the motor.
The Greenpower Education Trust promotes
sustainable engineering to young people,
organising a series of nationwide racing challenges for electric
cars. It encourages children, mainly through schools, to become
inspired in science, technology and engineering, offering a chance
to work together as a team to design and build an electric car and
then test it in competition. The racing series is based around a
standard electric motor and batteries with the challenge being to
build the most efficient car which will travel the furthest in 90
minutes on a single set of batteries.
Hugh Watson is Technical Director of
Innova, a precision engineering company based only
a few miles away from Gemini Data Loggers' Chichester headquarters.
Hugh and his two sons have designed and built a car themselves, and
ran it for the first time at an event at the Goodwood Motor Circuit
where they finished 19th out of 70, winning the best newcomer
award. The next step was to make the car more aerodynamically
efficient with a body shell and to ensure that the motor was
running in the most efficient manner.
Paramount to achieving the best result is accurate
current monitoring, so Hugh aimed to measure the voltage
drop along one of the power cables and calculate the current draw
from that. Tinytag data loggers were recommended
by a friend, and Gemini supplied a voltage data
logger which monitors 0 to 2.5V DC. The logger was
used to monitor the voltage drop on the input cables in
order to calculate the current. Analysis of the data
allowed comparisons of the current drain, resulting in changes to
the car's gearing in order to maximise the speed.
The next challenge was held at Dunsfold Park - otherwise known
as the venue of the Top Gear test track - where the car came in
10th out of 50. Hugh has been impressed by the quality of the data
provided by logger, commenting, "It has recorded tiny
drops in voltage very accurately, allowing us to make informed
decisions about optimising the usage of the
Gemini designed the Tinytag Talk 2
TK-4703 voltage data logger as an economical solution
for applications such as this where small changes in voltage need
to be accurately recorded. Its compact and lightweight design also
makes it ideal for use where space is at a premium.