Active magnetic bearings support a rotating shaft without physical contact by using electrically controlled magnetic forces to levitate the rotor. They involve mechanical, electrical, control, and computer engineering. An active magnetic bearing uses sensors to measure the rotor's position, a controller derives a control signal, amplifiers generate a control current to produce magnetic forces that maintain the hovering position based on control laws ensuring stability, stiffness, and damping. Benefits include lubrication-free operation, cleanliness, reliability, high speeds, low vibration and energy use, while disadvantages are high costs, weight, and size. Applications include compressors, turbines, pumps, motors, generators, meters, flywheels, maglev trains, and artificial hearts. Future research

2. • In an ever changing world, limits of current designs are
constantly pushed further, requiring genuinely new ideas
and technologies to meet new targets.
• The use of bearing is essential to all types of machines
they provide the function of supporting heavier
component in a desired position.
• Active magnetic bearings can make difference in both
new designs and redesigns of existing ones.

3. • What is AMB ?
• Principle of operation
• Merits
• Demerits
• Application
• Future advances
• Conclusion

4. An Active Magnetic Bearing is a device which
supports a rotating shaft, without any physical
contact by suspending the rotor in the air, with
an electrically controlled magnetic force.
It is a mechatronic product which involves
different fields of engineering such as
mechanical, electrical, control system, and
computer science etc.

5. Proposed System :
Magnetic bearing works on the principle of Electromagnetic
Suspension & it consist of :
1. Electromagnetic Assembly
2. Set of Power amplifiers
3. Controller / Microprocessor
4. Gap / Position Sensor

6. • Function principle of the Active Magnetic Bearing is shown in
the fig.

7. The active electromagnetic bearing is the principle which is
actually used most often among the magnetic suspensions. The figure
above explains the components and the function of a simple bearing.
A sensor measures the displacement of the rotor from its reference
position, a microprocessor as a controller derives a control signal from
the measurement, a power amplifier transforms this control signal
into a control current, and the control current generates the magnetic
forces within the actuating magnet in such a way that the rotor
remains in its hovering position. The control law is responsible for the
stability of the hovering state as well as the stiffness and the damping
of such a suspension

8.  Lubrication Free
 Clean & Contamination Free
 Reliability
 High Surface Speed
 Low Vibration
 Low Energy
 Consumption
 Non-Contacting
 Submerged Operation

9.  Very low and predictable friction
Bearing have the ability to run without
lubrication and in a vacuum.
Low noise and smooth ride by eliminating
physical contact surfaces can be achieved.
 High cost
Heavy weight
Relatively large size

10. Used in compressors ,turbines,
pumps ,motors ,generators.
Used in watt-hour meters.
Flywheels also use AMBs.
Maglev trains.
Artificial hearts.

11. • HT-AMBs are a field of potential research.
• Electrodynamics bearing.
• Reliability of special Bearing
• Bearing Failure Analysis at dead load and live
loads

12. Through technical advances ,magnetic bearing offer
advantage for a much border range of machines and
applications design innovation related to miniaturization
,integration and standardization continue to increase the
general acceptance of magnetic bearing for many new
and existing applications setting standard for better
,smaller and greener

13. QUESTIONS ?