Advances in magnetic material, control have contributed to the realization of completely non-contacting relating systems employing magnetic bearings to eliminate the last remaining wear out prone element. Current efforts are being directed more towards reducing the size, weight and complexity of these devices to achieve complete acceptance.The AMB technology has been briefly reviewed including its advantages, components, working principles, cost and performance. Some design and Implementation issues have been also discussed. The taking into consideration the above advantages, the adoption of magnetic bearings in industry will be more economical, efficient and environment friendly compared to the conventional bearings. The authors believe that AMB systems are still relatively more expensive than conventional mechanical bearings; therefore the massive used of AMB in industries is still prohibitive despite of the many benefits offered. The AMBs will still not completely replace conventional bearings in rotating machinery in the near future. However, AMB can find its place well in a limited volume of high performance rotating machines.

1. PowerPoint Presentation
on
”ACTIVE MAGNETIC BEARING’s”
Guided by:- Prof. N.D. SADAPHAL
Prepared by:- WADEKAR BHAGVAT A.

2. OVERVIEW
 Introduction.
 Types of Magnetic Bearings.
 Componenets of AMBs.
 Control System.
 Losses in AMBs.
 Advantages & Disadvantages.
 Applications.
 Conclusion.
 References.

3. INTRODUCTION
• Basics about Bearing
• Need of AMBs

4. TYPES OF MAGNETIC BEARINGS
MAGNETIC
BEARINGS
ACTIVE
MAGNETIC
BEARINGS.
1. Radial AMB
2. Thrust AMB.
3. Cone AMB
PASSIVE
MAGNETIC
BEARING.
ALL ACTIVE
MAGNETIC
BEARINGS

5. MAGNETISM

6. COMPONENETS OF AMB‘s
• Iron Core
• Windings
• Rotor/Shaft
• Position Sensors
• Controller
• Power Amplifiers
Fig. Components of AMB

7. WORKING OF AMB’s
Fig. Radial Magnetic Bearing Fig. Simple Horseshoe Electromagnet

8. RADIAL AMB
Fig. Radial AMB

9. THRUST AMB
Fig. Thrust AMB

10. CONTROL SYSTEM
• SENSORS
• CONTROLLER
• AMPLIFIERS
Fig. Control System

11. LOSSES IN AMBS
 COPPER Losses - Stationary parts
 IRON Losses - Rotating parts
• Hysteresis Losses
• Eddy Current Losses
 RESISTANCE Losses
 AMPLIFICATION Losses

12. ADVANTAGES
No wear due to contactless operation.
No lubrication & Contaminants.
Pollution free.
Extremely high speed.
Wide range of operating temp.
(– 2500 deg C to 2200 deg C)
Less vibrations due to precise control.

13. DISADVANTAGES
Specific load capacity.
High complexity.
Require power to drive the control system.
High initial cost.

14. APPLICATIONS
 High precision position stages.
 100,000 rpm milling spindle
 Pulp refiner
 Smart Aero Engines.
 Turbo machines.
 Gears, Chains, Conveyors etc.
 Energy Storage Flywheels.
 Variable speed spindles.
 Refrigeration compressor

15. CONCLUSION
The taking into consideration the above advantages, Magnetic
bearings in industry will be more economical, efficient and
environment friendly compared to the conventional bearings. But AMB
systems are still relatively more expensive, therefore the massive use of
AMB in industries is still prohibitive despite of the many benefits
offered.
The AMBs will still not completely replace conventional
bearings in rotating machineries in the near future. However, AMB can
find its place well in a limited volume of high performance rotating
machines.

16. REFERENCES
• “G. van Schoor, A.C. Niemann, C.P. du Rand”, “Evaluation of demodulation
algorithms for robust self-sensing active magnetic bearings”, “147 August 2012’
• “M. Aenis, E. Knopf, R. Nordmann”, “Active magnetic bearings for the
identification and fault diagnosis in turbomachinary” “year 2002”
• “S.C. Mukhopadhyay, C. Gooneratne and G. Sen Gupta”, “Magnetic Bearing: An
Integrated Platform for Teaching and Learning”, “2nd International Conference on
Autonomous Robots and Agents December 13-15, 2004”
• “Gerhard Schweitzer” “Applications and Research Topics for Active Magnetic
Bearings” “Proc. IUTAM-Symp. on Emerging Trends in Rotor Dynamics, March
23-26, 2009, Indian Institute of Technology, Delhi, India. Springer-Verlag”
• Mechanical Engineering – Volume111/No.12 – Eisenberg B.

17. Thank You