24-07-2014, 10:12 AM
EDDY CURRENT BRAKE
EDDY CURRENT BRAKE.pptx (Size: 1.49 MB / Downloads: 13)
Introduction Of Eddy Current
Eddy currents are electric currents induced in conductors when exposed to a changing magnetic field; due to relative motion of the field source and conductor or due to variations of the field with time.
This can cause a circulating flow of electrons, or current, within the body of the conductor.
These circulating eddies of current have inductance and thus induce magnetic fields.
Introduction Of Eddy Current Brake
Eddy current brakes, like conventional friction brakes, are
responsible for slowing an object, such as rotating machinery, a moving train, or even a roller coaster.
These brakes make use of opposing tendency of eddy currents. The drawbacks of ordinary brakes which uses mechanical blocking could be eliminated by use of a more simple and effective mechanism known as eddy current brakes
Advantages Of Eddy Current Brakes:-
It uses electromagnetic force and not mechanical friction
Non-mechanical (no moving parts, no friction)
Fully resettable
Can be activated at will via electrical signal
Low maintenance
Operates at any rotational speed
Light weight
Eddy-current brakes are quiet, frictionless, and wear-free, and require little or no maintenance.
They produce no smell or pollution (unlike friction brakes, which can release toxic chemicals into the environment).
Conclusion:-
The ordinary brakes which are being used now a days stop the vehicle by means of mechanical blocking. This may cause skidding and wear and tear of the vehicle.
And if the speed of the vehicle is very high the brake could not provide that much high braking force and it will cause problems.
These drawbacks can be eliminated by using a simple and effective mechanism of braking system called eddy current brakes.
It is an abrasion free method for braking of vehicles including trains.
It makes use of opposing tendency of eddy currents.