EDDY CURRENT RETARDER
Indian Institute of Technology
Hyderabad
DIPIN K NAIR
KENNETH JOSEPH PAUL
NAVANEETH T CHANDRAN
VIVEK D S
VIVEK A K
ME12B1014
ME12B1020
ME12B1025
ME12B1044
ME11B1037
INTRODUCTION
 This projects intends to the design and implementation of
new system of retardation (braking) for automobiles
 The design of the new brakes is based upon the
phenomenon of electromagnetic induction and eddy currents
 The design basically consists of very strong magnet and
rotating metallic wheel
 The wheel develops eddy currents due to the change in
magnetic flux associated to the wheel due to its rotation
 The eddy current development obeys Maxwell’s law of
electromagnetic induction and Lenz’s law of direction of
induced current
 The current in turn dissipates the rotational energy of the
wheel as heat bringing the wheel to a stop
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EXISTING BRAKING METHODS
 Drum brakes
 Disk brakes
 Hydraulic brakes
 Electric brake
 ABS (Anti skid Braking System)
Disk brake
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Disk brake
Air brake
NEED FOR ALTERNATIVE
 All conventional systems of braking in road vehicles uses
development of contact friction for retardation
 These systems are probe 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
 Weight brakes add additional weight to the automobile
serving no other purpose and significantly reducing traction
under certain circumstances
 Brakes usually creates small noise on application and may
also create loud screeches on hard usage
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DESIGN
The design consists of following parts
1. Aluminium wheel
2. Mild steel shaft
3. Free wheels
4. Strong permanent magnet
5. 12v DC motor
6. 12v /2.5 Ah lead battery
7. Metallic frame
8. Braking arm
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PROS
 High impact
 Less friction
 Low maintenance requirement
 Less noise
 Simple in design
 High degree of safety
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CONS
 Failure to act as a holding device
 Usage of electric power for braking
 Less effective under very low velocities
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APPLICATIONS
 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
 May also find application in virtually any rotating system
which have metallic parts
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