FROM EXCEL POLYTECHNIC

1. DEPARTMENT OF MECHANICAL
ENGINEERING

2. DINESHPIRAN .G
Prabhakaran .C
Praveen kumar .B
Nandha kumar .M.R
Karthikeyan .N
Gokulakannan .M J.SIVAKUMAR

3. WORKING MODEL

4. Used components
WHEEL
CHAIN
MOTOR
TRANSFORMERS
PC BOARD WITH IC’s
BREAK PEDAL OR BUTTON

5. CONSTRUCTION
A typical electromagnetic brake has three elements in
its construction – a magnetic field comprising of a coil
and a shell, an armature and the hub.
When the brakes are applied, the armature is
attracted to the magnetic field developed by the coil.
Electromagnetic brakes are now used in airplane
braking systems in addition to extensive use in train
and tram braking systems.

6. WORKING
Electromagnetic brakes slow down or stop a moving
machine by using an electromagnetic force to apply
friction to its wheels.
These brakes receive the electromagnetic force they
require from a magnetic field comprised of a
magnetic coil and a coil shell that is bolted to its
frame.
Electromagnetic brakes and eddy current brakes use
electromagnetic force but electromagnetic brakes
ultimately depend on friction and eddy current
brakes use magnetic force directly.

7. DIAGRAM

8. PRINCIPLE
Electromagnetic brakes slow down or stop
a moving machine by using an
electromagnetic force to apply friction to its
wheels.
These brakes receive the electromagnetic
force they require from a magnetic field
comprised of a magnetic coil and a coil shell
that is bolted to its frame.

9. MERITS
The electromagnetic brakes have excellent heat
dissipation efficiency .
Electromagnetic brakes have better thermal
dynamic performance than regular friction brakes.
Electromagnetic brake systems will reduce
maintenance cost .
The problem of brake fluid vaporization and
freezing is eliminated.

10. DEMERITS
 Dependence on battery power to energize.
The brake system drains down the battery much faster.
Due to residual magnetism present in electromagnets.
The brake shoe takes time to come back to its original
position.
A reduction in the coefficient of friction (‘brake fade’)
suddenly occurs.

11. APPLICATIONS
In locomotives, a mechanical linkage
transmits torque to an electromagnetic braking
component.
They are distinguished from mechanical track
brakes, where the braking element is
mechanically pressed on the rail,(TRAINS).
Electric motors in industrial and robotic
applications also employ electromagnetic
brakes.
It thus reducing wear on the tires, and then as
a generator to provide regenerative braking.