Artemis's new Digital Displacement (DD) power system this year received the
company a prestigious Regal Academy of Engineering MacRobert Award.
The company, owned through Mitsubishi, hit the head lines earlier this year
when a 7MW (megawatt) wind turbine containing an electronic Displacement
transmission (DDT) hydraulic system was deployed to work as a floating
wind-turbine within deep water 20 kms off Fukushima. It's the biggest floating
wind-turbine in the world.
So far hydraulic pumps and engines have been controlled by different the
stroke of aide with an adjustable mechanism, but they have proved inefficient
for auto transmissions and wind turbines.
In comparison, the output of a DD pump motor or motor is managed by digitally
enabling person cylinders containing electronically-controlled electronic
valves. Individual cylinders could be switched from idle in order to pumping
cycle once each and every shaft revolution, in a design determined by an
embedded control. This provides results in a faster and more accurate control
reaction compared to variable-stroke machines.
"We developed digital displacement hydraulics, which is a way of turning off
the capability that you don't need without bringing in a parasitic loss, which
was the fundamental starting point to create very efficient hydraulics that was
both controllable and worldwide to very big weighing scales, " explained
chairman as well as founder of Artemis, Doctor Win Rampen.
According to controlling director, Dr Niall Caldwell, "conventional
hydraulics have some disadvantages, particularly efficiency, controllability,
and also noise. So digital shift is a fundamental rethinking associated with
hydraulic power technology, that embeds electronics and software program,
digital control at the heart from the machine and that revolutionizes hydraulic
technology to become much more effective, much more controllable, and more
tranquil. "
Artemis is focusing on various projects to enable substantial reduction in
the fuel usage of commuter trains and busses. A regenerative braking power
storage system using their DD technology showed fuel usage reductions by 10
percent, and is retrofitted to existing diesel powered trains. It also produces
much less noise and cuts wear out emissions within stations.
The opportunity of hybrid buses is much more impressive, with fuel cost
savings of 27 percent confirmed on tests carried out upon vehicles used by
Lothian Busses, made by manufacturer Alexander Dennis.
Caldwell says the technology will pay for itself within two or three many
years, meaning that there is no need for any federal government subsidy, a
particularly important factor inside developing countries. In addition , this
uses conventional materials, instead of expensive ones often used throughout
mainstream electric hybrid technologies.
"What we're trying to perform is make a hybrid technological innovation that
is very low cost, it can made with conventional materials for example steel,
rather than exotic along with rare materials such as lithium, which can really
be applied internationally to make a hybrid system which pays for itself as a
company case, without subsidy, and that we think that's the key to creating all
the world's buses mixed-style models, " he said.
Artemis has also adapted DD mixed transmission for a car, particularly its
BMW 530i, which usually it has been driving visitors to the site around in
because 2008. Independent tests revealed double the fuel economy with city
driving compared to the exact same car with a six pace manual transmission,
along with 30 % lower carbon dioxide emissions.
Because he drove the car round the company's Midlothian factory in addition
to demonstrated how it worked well, Caldwell told Reuters: "Conventional
electric hybrid mixes the potency of the engine with that of the electric motor
and an electrical battery. In contrast our hydraulic hybrid mixes the power of
the actual engine with a hydraulic electric motor and a hydraulic battery, that
is otherwise known as an accumulator, which stores the energy regarding braking
the vehicle in the form of compacted gas. "
According to Rampen, part of the beauty of DD is the fact that its power
rating may be increased dramatically by replicating multiple hydraulic
components inside a single system.
He stated: "The power rating might be increased very dramatically, up to now
up to 7 megawatts, just by making a module and then replicating it around a
machine to create a very high-powered machine. But additionally these modules
tend to be instead small within themselves and thus they're easy to take out as
well as replace, and when you're dealing with offshore wind, particularly,
wherever access is very difficult and also expensive, to be able to dismantle
along with replace any one component within this very inaccessible place is
essential. "
Rampen says the MacRobert Award has created huge worldwide interest in
Artemis.
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