Automobile Engineering

1. B.S.F Polytechnic, C.S.M.T
Tekanpur, Gwalior
EDDY CURRENT RETARDER
Submitted To :- Submitted By :-
Durgesh, Sir. Shailendra Singh Tomar
Automobile 2nd Year
14042A03048

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.
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3. RETARDER
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4. 8/2/2017
In Propeller Shaft

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Near Engine

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Near Rear Axle

7. 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 continues 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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8. Advantages
 High impact
 Less friction
 Low maintenance requirement
 Less noise
 Simple in design
 High degree of safety
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9. Disadvantages
 Failure to act as a holding device
 Usage of electric power for braking
 Less effective under very low velocities
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10. 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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