This document discusses electromagnetic brakes as an alternative to conventional friction brakes. It begins by defining a brake and friction brakes, then notes the disadvantages of friction brakes including wear, heat production, and ineffectiveness in wet conditions. It goes on to explain how an electromagnetic brake works by using eddy currents induced in a disc to produce torque opposing the disc's rotation. Advantages of electromagnetic brakes are listed as having no friction, low maintenance, less noise, and safety. Disadvantages include needing electric power for braking and lower effectiveness at low velocities. Electromagnetic brakes are described as already being used in some rail systems and being applicable to vehicles and aircraft. The document concludes that electromagnetic brakes are superior

1. SELF STUDY COURSE-1
GANESH(2E2)
2ND EEE-C

3.  What Is brake?
 Needfor alternative
 What is electromagnetic brake
 Advatages
 Disadvantages
 Applications
 conclusion

4.  A brake is a mechanical device which retards
motion.
 Brakes use friction between two surfaces to
convert the kinetic energy of the moving
object into heat.
 Types of Frictional brakes-Disc, Drum

6.  All conventional systems of braking in road
vehicles uses development of contact friction
for retardation
 These systems are prone to the wear and tear
on usage
 Conventional braking systems produces
continuous power dissipation as heat and
may fail if the temperature rises too high
 Friction based braking methods are also not
efficient under wet conditions

7.  Disc is rotated in magnetic field
 eddy currents will be produced in disc
 eddy currents induced in disc will produce a
torque (motor principle)
 produced torque in disc opposes actual
rotation of disc (Lenz law)

9.  No friction
 Low maintenance requirement
 Less noise
 Simple in design
 High degree of safety

10.  Failure to act as a holding device
 Usage of electric power for
braking
 Less effective under very low
velocities

11.  Already in use under some railway system
 Can be used for any road vehicles
 Equally applicable to heavy and light vehicles
 Can be used as additional retarder for
aircrafts

12.  Electromagnetic Braking is superior to
conventional frictional braking as there is no
friction and heat in electromagnetic braking.
 So the conventional disc and drum brakes can
be replaced with electromagnetic brakes.