As has been discussed many times, the real problem with in-wheel motors
is the additional unsprung weight. This is design is interesting in
that it would reduce that weight. Would it be enough? A coil of wire
around the wheel still would add quite a bit of weight. Removing the
axle would compensate that a little bit.
All together this sounds like a pancake style motor with a 10cm gap.
Since the stator would be fixed, it seems there would be a lot of
misalignment happening while driving on a bumpy road - possibly vertical
travel of, what, 10-20cm - resulting in reduced power? Maybe that's
good - it forces you to slow down on bumpy roads :)
Peri
------ Original Message ------
From: "brucedp5 via EV" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Sent: 30-May-15 4:42:33 AM
Subject: [EVDL] EVLN: Power transmitted wirelessly to run 4 In-Wheel
e-Motors
http://www.greentechlead.com/electric-vehicle/japanese-wireless-tech-promise-for-electric-vehicles-23819
Japanese wireless tech promise for electric vehicles
May 27, 2015 Ajith Kumar S
[image
http://www.greentechlead.com/wp-content/uploads/2015/05/In-Wheel_Wireless_Motor.jpg
]
Researchers at University of Tokyo claim to have developed a technology
for
wireless transfer of electricity which they believe will help develop
more
advanced electric vehicles.
The team has incorporated the technology in the “world’s first in-wheel
motor system for electric vehicles” that transmits power wirelessly to
run
motors attached with each wheel.
The new system transmits electricity from an onboard power source to a
coil
attached to the wheel hubs without wires.
The researchers say the system wirelessly transmits electricity stored
in
the vehicle’s batteries over a distance of 10 centimetres. Power from
the
batteries is passed to a transmitting coil from where it is transmitted
over
the 10-cm distance to a receiving coil attached to the wheel hub.
“This technology will pave the way for the development of electric
vehicles
that receive electricity wirelessly from transmitting coils embedded
under
road surfaces. It can be also applied to fuel-cell vehicles and
industrial
machinery,” Japanese newspaper Asahi Shimbun has quoted Hiroshi
Fujimoto, an
associate professor at the University of Tokyo specializing in electric
vehicle control, as saying.
According to the researchers, the in-wheel motor, also known as wheel
hub
motor, is an electric motor incorporated into the hub of a vehicle’s
wheels
to directly drive each wheel.
The technology does away with the need for a drive shaft, which is part
of
conventional electric vehicles and mechanically transfers energy to all
the
wheels and drives them.
The new technology could help build lighter vehicles that require less
energy. It should also allow greater control on acceleration and
braking,
and mitigates the risk of skidding.
Current cars that employ in-wheel motors depend on wires to transmit
electricity and the complex wiring distribution combined with
susceptibility
to short circuits have hindered development of such a vehicle for
practical
purposes.
The researchers have also succeeded in running a motor using 3
kilowatts of
electricity and sent control information to each wheel using
standardized
Bluetooth wireless technology.
And the researchers say the prototype rear-wheel-drive car they have
developed can, in theory, run at 75kmph.
[© greentechlead.com]
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http://evdl.org/evln/
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{brucedp.150m.com}
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Sent from the Electric Vehicle Discussion List mailing list archive at
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