Magnetic levitation trains rely on powerful energy sources, strong magnets, and metal coils to rise slightly in the air. Then the same technology propels them forward. In simple terms, the magnetized coils along either side of the track repel the magnets to lift the vehicle and keep it moving forward.
The Surfaces Magnetic Levitation Trains Rest On
Magnetic levitation trains in motion have a cushion of air beneath them. When stationery, they rest on steel skids or rubber wheel tires. Japanese versions have these tires, enabling them to come to rest in the event of power failure.
The German Transrapid system uses onboard backup batteries. These provide temporary power to the levitation system, enabling the train to coast down in the event of a power outage. Moreover, the Transrapid uses a linear motor only capable of travel in one direction. This is a critical safety feature, given it’s capable of 340 m.p.h. and could share the route with other services
Impressive Technology behind The Transrapid System
The German magnetic levitation trains are modular independent units. Each section uses 50 – 100 kilowatts of energy depending on operating mode. This translates to 67 – 134 horsepower when comparing with diesel trains.
The overall design benefits from a drag coefficient of 0.26, and 0.85 energy conversion efficiency. While initial construction costs are high compared to other options, it delivers passengers faster and can handle tighter turns and steeper gradients. Moreover, the Transrapid batteries provide sufficient energy for 7.5 minutes travel.
This is sufficient time for the linear stator motor to reverse. Once train speed drops below 100 m.p.h., it slides to a stop on landing skids. The system is operating in China between Shanghai and Pudong International Airport. We understand engineers are studying it “to learn and absorb foreign advanced technologies while making further innovations.”
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Preview Image: Transrapid in Shanghai
