Department of Mechanical Engineering
Seminar
Active Magnetic Bearing
Presented By
Devendra Anil Chaudhari
Roll Number
21MS302
Under the Guidance of
Dr. P.V. Deshmukh
Professor
Mr. Pravin Dhole
Senior Manager
Knorr-Bremse Technology Center India Pvt. Ltd.
Survey no. 276, Village Mann, Hinjewadi
Phase 2, Tal. Mulshi, Pune 411057(India)
Academic Year: 2022-23
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Introduction
• 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.
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Overview:
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What is AMB ?
Principle of operation
Merits
Demerits
Application
Future advances
Conclusion
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What is AMB ?
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.
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PRINCIPLE OF OPERATION
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
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PUTTING AT ALL TOGETHER:
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Function principle of the Active Magnetic Bearing is shown in the fig.
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ACTUAL WORKING
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
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AMB PERFORMS :
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Lubrication Free
Clean & Contamination Free
Reliability
High Surface Speed
Low Vibration
Low Energy
Consumption
Non-Contacting
Submerged Operation
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Advantages :
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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.
Disdvantages :
• High cost
• Heavy weight
• Relatively large size
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Conclusion
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
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Thank You
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