Eddy current brakes work by generating eddy currents in a conductor when it moves through a changing magnetic field. This induces an opposing magnetic field that creates a braking force based on Lenz's law. There are two main types - circular brakes with a disc between electromagnet poles, and linear brakes using a rail and magnetic yoke. Advantages include no wear, adjustable braking, and being lightweight; disadvantages are reduced braking at low speeds and difficulty designing and simulating the system. Applications include high speed trains and roller coasters.

1. EDDY CURRENT BRAKES
PRESENTED BY:
M.PRIYA VANDANA
P.V.SAI PRIYA

2. CONTENTS:
 Introduction of Eddy Current.
 Introduction of Eddy Current Brake.
 Working Principle.
 Types of Eddy Current Brakes.
 Advantages and Disadvantages.
 Applications.
 Conclusion.

4. EDDY CURRENT:
 An Eddy Current is a Swirling current
set up in a Conductor in response to
a Change in Magnetic Field.

5. EDDY CURRENT :
CONDUCTOR
FLUCTUATING MAGNETIC FIELD
VOLTAGE
CURRENT
EDDY CURRENT

6. EDDY CURRENT BRAKES:
 It is a device used to slow a moving
object by creating eddy currents.
 Braking action is made by Varying the
Strength of the Magnetic Field.
 A Braking Force is possible when an
electric current is passed through the
Electromagnets.

7. EDDY CURRENT BRAKES:

8. WORKING PRINCIPLE:
Eddy Current brake is based on Two
basic Principles of
Electromagnetics,which are
 Faraday’s Law
 Lenz Law

9. FARADAY’S LAW:
 It states that change in magnetic flux
induces an EMF in the circuit.
LENZ LAW:
“ An induced EMF always gives rise to a
current whose magnetic field opposes the
original change in magnetic flux”

10. WORKING:
 Electromagnets produce Primary magnetic field
from supplied current which in turn produces
eddy current.
 Eddy Current produces secondary magnetic field
which opposes the primary field.
 Opposing magnetic field reduces the Velocity

11. WORKING:

12.  Circular Eddy
current Brakes.
 Linear Eddy
Current Brakes.

13. CIRCULAR EDDY CURRENT BRAKES:
 Brake assembly is Circular in Shape.
 Consists of disc(magnetic material)
placed between the poles.
 Conductor coils are wound on the poles
and when the disc rotates through the
magnetic field creates Eddy Currents.

14. CIRCULAR EDDY CURRENT BRAKES:

15. LINEAR EDDY CURRENT BRAKES:
 The Linear Eddy Current Brake Consists of
a magnetic yoke with Electric coils placed
along the rail.
 This magnet is kept at a distance of 7m from
the rail.
 When the magnet is
along the rail it generates the eddy
currents.

16. LINEAR EDDY CURRENT BRAKES:

17. LINEAR EDDY CURRENT BRAKES:

18. ADVANTAGES:
 No wear or Tear.
 No Noise or Smell.
 Adjustable Brake Force.
 Uses Electromagnetic force instead of
Friction.
 Low maintenance.
 Light weight.

19. DISADVANTAGES:
 Breaking Force diminishes as Speed
diminishes.
 Very Tough Design and Simulation.
 No ability to hold load in Standstill position.
 Acts like a Governor to reduce the Speed.
 We cannot Use it for Low speed Vehicles.

20. APPLICATIONS:
 In high speed trains.
 In roller coaster for braking and smooth functioning.
 It is also used in vehicles but still not widely used.

21. CONCLUSION:
We can make Use of Opposing
tendency of eddy current to
control the speed of High Speed
Vehicles without any Wear and
Tear.