An electromagnetic clutch operates electrically but transmits torque mechanically. It engages and disengages through an electrical signal without the need for linkages. When electric current flows through coils around the clutch, it generates a magnetic field that engages the clutch. Electromagnetic clutches have a fast response time, high torque-to-size ratio, and easy engagement/disengagement compared to mechanical clutches. However, they also carry risks of overheating and have higher initial costs.

1. Electromagnetic Clutch
Seminar Guide-
Presented by-

2. Introduction
 Warner Electric designed the first electromagnetic
clutch.
 Electromagnetic clutches operate electrically but
transmit torque mechanically.
 That’s the reason we also called electromechnical
clutches.

3. E.M. Clutch Specifications
• Engagement & disengagement is electrically
operated.
• No linkages are required to control its engagement
• Easy to handle.
• High torque to size ratio.
• Response is fast.

4. Unit of E.M. Clutch

6. Principle Of E.M. Clutch
• E.M. clutch is simply based
on electro-magnetism.
• Magnetic fields are
produced due to circulation
of electric current in
conducting coils.
• Direction of magnetic field
can be obtain by “right hand
rule”.

7. Working of E.M. Clutch
• Working conditions..
1. D.C. source.
2. Voltage supply should be same as clutch rating.
3. Constant / non fluctuating power supply.
4. Maintains almost constant operating temperature.

8. Working of E.M. Clutch (Cont..)

10. Engagement Time
• There are two engagement time to consider.
1. Time take for coil to develop the magnetic field to pull the
armature.
(i)No. of turns in coil.
(ii)Air gap between armature and rotor.
2. Response time of clutch (time to speed).
T = (WK2 x ∆N) / (308 x t).

11. Applications Of E.M. Clutch
• Machinery.
e.g. printing machinery, conveyors, lawnmowers etc.
• Automobiles.
e.g. Outdoor use, in some Renaults cars.
• Locomotives.
e.g. Diesel locomotives.

12. Advantages Of E.M. Clutch
• Complicated linkage is not required.
• Wear & tear is almost eliminated.
• Requires less current with no load condition.
• It can work on 24V D.C. with low wattage.

13. Disadvantages Of E.M. Clutch
• Risk of overheating during engagement.
• High initial cost
• If the current falls, torque will also decreases.

14. Reference
• http://www.mechanicalproject.com
• http://www.seminaronly.com
• http://www.emclab.umr.edu
• http://reality.sgi.com/csp/scveme/emcdef.html
• http://www.howftuffworks.com/gears.htm
working of clutch.

15. THANK YOU!