Electromagnetic Field Theory

Magnetic Levitation

Magnetic Levitation is way of using electromagnetic fields to levitate things without any noise or the need for liquid fuel or air. In short Magnetic Levitation is known as Maglev, which means floating one magnet over another.

Magnetic Levitation employes diamagnetism, an intrinsic property of many materials referring to their ability to expel temporarily a portion of an external magnetic field. Superconductors are ideal diamagnetics and completely expel magnetic fields at low temperatures.

Types of maglev:

  1. Electromagnetic levitation (EML), which uses the attractive forces between electromagnets on the levitated object and the circuit on the ground.
  2. Electrodynamic levitation (EDL), which makes use of the repulsive force between superconductive magnets on the levitated object and induced current in the secondary circuit on the ground.

Subsystem of maglev:

  1. a magnetic suspension, to ensure a stable suspension of a vehicle in its own magnetic field.
  2. a propulsion motor, produce a propulsion force sufficient for a continuous flight of the vehicle along an assigned track with a given speed.
  3. power system, provides uninterrupted power supply.

Examples

  1. Levitating trains
    • A maglev train is a train like vehicle that is suspended in the air above the track and propelled forward using the repulsive and attractive forces of magnetism.
    • Maglev vehicles are designed for operating speeds of up to 500 km / hr.
    • Maglev systems operate in almost all weather conditions.
  2. Levitating displays
magnetic-levitation-platform
By:
Paramjeet Singh Jamwal
Lecturer

Guru Nanak Education Trust Group Of Institutions (GNET), Roorkee

Reference:
Matthew N. O. Sadiku, “Principles of Electromagnetics”, OXFORD University Press.
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