Design of Maglev Motorcycle
Maglev (derived from magnetic levitation) is a method of propulsion that uses magnetic levitation to propel vehicles with magnets rather than with wheels, axles and bearings. With maglev, a vehicle is levitated a short distance away from a guideway using magnets to create both lift and thrust. High-speed maglev trains promise dramatic improvements for human travel if widespread adoption occurs.[1]
Maglev trains move more smoothly and somewhat more quietly than wheeled mass transit systems. Their non-reliance on friction means that acceleration and deceleration can surpass that of wheeled transports, and they are unaffected by weather. The power needed for levitation is typically not a large percentage of the overall energy consumption;[2] most of the power is used to overcome air resistance (drag), as with any other high-speed form of transport. Although conventional wheeled transportation can go very fast, maglev allows routine use of higher top speeds than conventional rail, and this type holds the speed record for rail transportation. Vacuum tube train systems might hypothetically allow maglev trains to attain speeds in a different order of magnitude, but no such tracks have ever been built.
Compared to conventional wheeled trains, differences in construction affect the economics of maglev trains. With wheeled trains at very high speeds, the wear and tear from friction along with the concentrated pounding from wheels on rails accelerates equipment deterioration and prevents mechanically-based train systems from routinely achieving higher speeds.[3] Conversely, maglev tracks have historically been found to be much more expensive to construct, but require less maintenance and have low ongoing costs.
Despite decades-long research and development, there are presently only two commercial maglev transport systems in operation, with two others under construction.[4] In April 2004, Shanghai began commercial operations of the high-speed Transrapid system. In March 2005, Japan began operation of the relatively low-speed HSST "Linimo" line in time for the 2005 World Expo. In its first three months, the Linimo line carried over 10 million passengers. South Korea and the People's Republic of China are both building low-speed maglev lines of their own design, one in Beijing and the other at Seoul's Incheon Airport. Many maglev projects are controversial, and the technological potential, adoption prospects and economics of maglev systems have often been hotly debated. The Shanghai system has been accused of being a white elephant.[5]
Technology
In the public imagination,
"maglev" often evokes the concept of an elevated monorail track
with a linear motor. This can be misleading. While several maglev systems are
monorail designs, not all maglevs use monorails,[24]
and not all monorail trains use linear motors or magnetic levitation. Some
railway transport systems incorporate linear motors but only use
electromagnetism for propulsion, without actually levitating the vehicle. Such trains
(which might also be monorail trains) are wheeled vehicles and not maglev
trains.[25]
Maglev tracks, monorail or not, can also be constructed at grade (i.e. not
elevated). Conversely, non-maglev tracks, monorail or not, can be elevated too.
Some maglev trains do incorporate wheels and function like linear
motor-propelled wheeled vehicles at slower speeds but "take off" and levitate
at higher speeds.[26][27]
Overview
MLX01 Maglev train Superconducting magnet Bogie
The term "maglev" refers
not only to the vehicles, but to the railway system as well, specifically
designed for magnetic levitation and propulsion. All operational
implementations of maglev technology have had minimal overlap with wheeled
train technology and have not been compatible with conventional rail tracks.
Because they cannot share existing infrastructure, these maglev systems must be
designed as complete transportation systems. The Applied
Levitation SPM maglev system is inter-operable
with steel rail tracks and would permit maglev vehicles and conventional trains
to operate at the same time on the same right of way. MAN in
Germany also designed a maglev system that worked with conventional rails, but
it was never fully developed.[28]
There are two particularly notable
types of maglev technology:
- For electromagnetic suspension (EMS), electronically controlled electromagnets in the train attract it to a magnetically conductive (usually steel) track.
- Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets which create a magnetic field that induces currents in nearby metallic conductors when there is relative movement which pushes and pulls the train towards the designed levitation position on the guide way.
Another experimental technology,
which was designed, proven mathematically, peer reviewed, and patented, but is yet
to be built, is the magnetodynamic
suspension (MDS), which uses the attractive
magnetic force of a permanent magnet array near a steel track to lift the train
and hold it in place. Other technologies such as repulsive permanent magnets
and superconducting magnets have seen some research.
Electromagnetic
suspension
Main article: Electromagnetic
suspension
In current electromagnetic
suspension (EMS) systems, the train levitates above a steel rail while electromagnets,
attached to the train, are oriented toward the rail from below. The system is
typically arranged on a series of C-shaped arms, with the upper portion of the
arm attached to the vehicle, and the lower inside edge containing the magnets.
The rail is situated between the upper and lower edges.
Magnetic attraction varies inversely
with the cube of distance, so minor changes in distance between the magnets and
the rail produce greatly varying forces. These changes in force are dynamically
unstable – if there is a slight divergence from the optimum position, the
tendency will be to exacerbate this, and complex systems of feedback control
are required to maintain a train at a constant distance from the track,
(approximately 15 millimeters (0.59 in)).[29][30]
The major advantage to suspended maglev
systems is that they work at all speeds, unlike electrodynamic systems which
only work at a minimum speed of about 30 km/h (19 mph). This
eliminates the need for a separate low-speed suspension system, and can
simplify the track layout as a result. On the downside, the dynamic instability
of the system puts high demands on tolerance control of the track, which can
offset, or eliminate this advantage. Laithwaite,
highly skeptical of the concept, was concerned that in order to make a track
with the required tolerances, the gap between the magnets and rail would have
to be increased to the point where the magnets would be unreasonably large.[28]
In practice, this problem was addressed through increased performance of the
feedback systems, which allow the system to run with close tolerances.
Electrodynamic
suspension
Main article: electrodynamic
suspension
JR-Maglev EDS suspension is due to
the magnetic fields induced either side of the vehicle by the passage of the
vehicle's superconducting magnets.
EDS Maglev propulsion via propulsion
coils
In electrodynamic suspension (EDS),
both the guideway and the train exert a magnetic field, and the train is
levitated by the repulsive and attractive force between these magnetic fields.[31]
In some configurations, the train can be levitated only by repulsive force. In
the early stages of JR-Maglev
development in Miyazaki test track, a purely repulsive system was used instead
of the later repulsive and attractive EDS system.[32]
There is a misconception that the EDS system is purely a repulsive one, but
that is not true. The magnetic field in the train is produced by either
superconducting magnets (as in JR–Maglev) or by an array of permanent magnets
(as in Inductrack). The repulsive and attractive force in the track is
created by an induced
magnetic field in wires or other conducting strips
in the track. A major advantage of the EDS maglev systems is that they are
naturally stable – minor narrowing in distance between the track and the
magnets creates strong forces to repel the magnets back to their original
position, while a slight increase in distance greatly reduces the repulsive
force and again returns the vehicle to the right separation.[28]
In addition, the attractive force varies in the opposite manner, providing the
same adjustment effects. No feedback control is needed.
EDS systems have a major downside as
well. At slow speeds, the current induced in these coils and the resultant
magnetic flux is not large enough to support the weight of the train. For this
reason, the train must have wheels or some other form of landing gear to
support the train until it reaches a speed that can sustain levitation. Since a
train may stop at any location, due to equipment problems for instance, the entire
track must be able to support both low-speed and high-speed operation. Another
downside is that the EDS system naturally creates a field in the track in front
and to the rear of the lift magnets, which acts against the magnets and creates
a form of drag. This is generally only a concern at low speeds (This is one of
the reasons why JR abandoned a purely repulsive system and adopted the sidewall
levitation system.[32]);
at higher speeds the effect does not have time to build to its full potential
and other forms of drag dominate.[28]
The drag force can be used to the
electrodynamic system's advantage, however, as it creates a varying force in
the rails that can be used as a reactionary system to drive the train, without
the need for a separate reaction plate, as in most linear motor systems.
Laithwaite led development of such "traverse-flux" systems at his Imperial College
laboratory.[28]
Alternatively, propulsion coils on the guideway are used to exert a force on
the magnets in the train and make the train move forward. The propulsion coils
that exert a force on the train are effectively a linear motor:
an alternating current through the coils generates a continuously varying
magnetic field that moves forward along the track. The frequency of the
alternating current is synchronized to match the speed of the train. The offset
between the field exerted by magnets on the train and the applied field creates
a force moving the train forward. (Source: Wikipedia)
My Design
This is my idea
of maglev motorcycle. Which will be made motorcycle without chain, exhaust,
engine and some other parts.
It's the future motorcycle.
It's the future motorcycle.