1. Indian Institute of Technology Hyderabad EDDY CURRENT RETARDER DIPIN K NAIRME12B1014 KENNETH JOSEPH PAULME12B1020 NAVANEETH T CHANDRANME12B1025 VIVEK D SME12B1044 VIVEK A KME11B1037

2. 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 5/24/2015

3. EXISTING BRAKING METHODS  Drum brakes  Disk brakes  Hydraulic brakes  Electric brake  ABS (Anti skid Braking System) 5/24/2015 Disk brake Air brake

4. 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 5/24/2015

5. DESIGN 5/24/2015 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

6. PROS  High impact  Less friction  Low maintenance requirement  Less noise  Simple in design  High degree of safety 5/24/2015

7. CONS  Failure to act as a holding device  Usage of electric power for braking  Less effective under very low velocities 5/24/2015

8. 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 5/24/2015