19-12-2012, 06:26 PM
MAGNETIC LEVITATION
1MAGNETIC LEVITATION.ppt (Size: 467 KB / Downloads: 65)
What is it?
It is a method by which an object is suspended in air with no support other than magnetic fields.
The electromagnetic force counteracts the effects of gravitational force.
In some cases the lifting force is provided by magnetic levitation, but there is a mechanical support bearing little load that provides stability. ( pseudo levitation)
STABILITY
Theories proved that it is not possible to levitate stably using only static, macroscopic, classical electromagnetic fields.
Forces acting on any object are combination of gravitational, electrostatic, magneto static fields, etc.
SUPERCONDUCTORS
They are perfect dia magnets (rel. permeability=0),can completely expel magnetic fields.
The levitation is stabilized due to the flux pinning within the superconductor.
MAGNETIC WIND GENERATOR CHARACTERISTICS
Micro-friction full permanent suspension bearings not only balance the horizontal wind pressure & vertical main load, but also have perfect stabilizing effect on axial direction of rotor system.
• Small start-Rotating torque: The start- Rotating torque is 28% of that of the preview same size unit.
• High rotating speed: the rotating speed is increased 10% under the same wind speed.
• High power output: the power output actual is raised evenly 20% under the same wind speed.
BENEFITS:
Negligible friction.
Less required area.
Increasing capacity.
Less maintenance cost.
Capital cost comparatively less.
Able to utilize winds with starting speed as low as 1.5 m/sec.
Life span increases.
Energy policy of India
The energy policy of India is characterized by tradeoffs between four major drivers:
Rapidly growing economy, with a need for dependable and reliable supply of electricity, gas, and petroleum products;
Increasing household incomes, with a need for affordable and adequate supply of electricity, and clean cooking fuels;
Limited domestic reserves of fossil fuels, and the need to import a vast fraction of the gas, crude oil, and petroleum product requirements, and recently the need to import coal as well; and
Indoor, urban and regional environmental impacts, necessitating the need for the adoption of cleaner fuels and cleaner technologies.