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Maglev Presentation

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by

GershKelly MaesLee

on 31 May 2011

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Transcript of Maglev Presentation

Land Based High-Speed Travel By:
Kelly Lee and Gershom Maes What is a Maglev? There are 3 types of Maglev Technology: 1) Electrodynamic Suspension
2) Electromagnetic Suspension
3) Halbach Array ElectrodynamicSuspension Electromagnetic Suspension Halbach Array How they Work Pros and Cons Pros Cons Comparison to Bullet Trains In the Future In Conclusion Electromagnetic Levitation: Propulsion: Permanent magnets along the underside of the train and track repel each other providing most of the lift
Electromagnets operate similarly, however the current they are provided with (and therefore the force they exert) is altered to keep the train in equilibrium
Permanent magnets lift, electromagnets stabilize
A small change in distance is a large change in force
A computer system controls the electromagnets to stabilize quickly Utilizes a linear motor in almost all circumstances Electrodynamic Levitation: Electromagnets along the underside of the train and track repel each other providing the entire lift
Electromagnets lift and stabilize
Inherently stable; no computer is required control magnets Propulsion: Commonly propelled by a linear motor
Must also have an optional wheeled method of transport
When electrodynamically controlled maglevs travel at slow speeds the electromagnets are not powerful enough to lift the train above the tracks therefore they must have an alternate method of moving on the tracks
May also use a conventional means of propulsion (propellers, jet engines, etc.) Halbach Array Levitation: Propulsion: Permanent magnets along the underside of the train repel passive coils on the track providing lift
This provides enough force to support a maglev of virtually infinite weight
As the distance between the track increases the repulsive force of the magnets increases exponentially Uses a linear motor or conventional means of propulsion EMS
Altering electromagnetic field
Permanent magnets
Must be controlled by other electromagnets
No guide wheels
Cheaper EDS
Requires magnets on train and track
Combination of both permanent and electromagnets
Easier to control
Guide wheels
More expensive Requires magnets on train and track
Permanent magnets
Powerful bar magnets
Train never touches track
Requires very little power Quieter
Environmentally friendly
Faster
Takes up less space
Safer
Less maintenance Expensive
Whole new set of tracks Fast train
Can use existing tracks
Very noisy
More maintenance
Has same risks as regular trains
Not as environmentally friendly Fast train
Can use existing tracks
Very noisy
More maintenance
Has same risks as regular trains
Not as environmentally friendly Should be used more
Costs
Has limitations Thank You Linear Motor: A linear motor is a motor that has been stretched out over a long, linear path
The motor used to power maglevs consists of electromagnets spaced at short, regular intervals down the track
Spaced out electromagnets also line the bottom of the train
When the magnets are aligned so that the train magnets are behind the track magnets, the track magnets PULL the train forwards
When the train is in front the magnets PUSH the train forwards
When the magnets are aligned they are turned off THE CONCEPT
OF VACTRAINS Vactrains: Vactrains are an improved version of maglevs
They are only theoretical currently because of their high cost
The concept is to shuttle maglevs through vacuum tunnels
This would eliminate wind resistance, which is essentially the only force that normally works against maglevs
This would be similar to travelling in outer space
Models suggest that a vactrain would be able to cross the entire pacific ocean in 20 minutes
Possibly unsafe; a puncture would cause cabin pressure to drop F=BIL
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