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Magnetic Bearings !

new and innovative concept

Ramesh Naidu

on 27 October 2012

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Transcript of Magnetic Bearings !

Brainstorm Results Research Notes Bearing..? (cc) photo by Metro Centric on Flickr (cc) photo by jimmyharris on Flickr (cc) photo by Metro Centric on Flickr Magnetic Bearings A bearing is a mechanical device that supports the moving parts of a machine. It’s primary purpose is to reduce friction and at the same time should control the rate of wear of shaft. Bearings are made to support radial loads, thrust loads, or combined radial-thrust loads. Ball Bearings A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. Roller Bearings A roller bearing is a type of rolling-element bearing that uses cylinders to maintain the separation between the bearing races. Fluid Bearings Fluid bearings are bearings which support the bearing's loads solely on a thin layer of liquid or gas.They can be broadly classified as fluid dynamic bearings or hydrostatic bearings. Disadvantages concerning the conventional mechanical bearings are... A probable solution is Magnetic Bearing... Magnetic Bearings..? A magnetic bearing is a bearing which supports a load using magnetic levitation i.e., without physical contact; for example, they can levitate a rotating shaft and permit relative motion with very low friction and no mechanical wear. Types of
mechanical bearings..! thfghfghfghstgh hagrgeghgjujgjlgyujhgbvjsfhbvljhdsfbvljhsfbvljhsdbvjhsfbvkj 1. Heat generation
2. Contact friction
3. Wear and tear of shaft
4. Frequent lubrication
5. Unsuitable for high temperatures
6. Limited operating speeds
7. High noise Types Of Magnetic Bearings Passive Magnetic Bearings Active Magnetic Bearings Low Loss Homo polar Electrodynamic Bearing... Components..! 1. Ring Magnets
2. Conducting ring with skin depth 3. Iron pole shoes
4. Housing and end plates Working of the bearing..! Advantages..! 1. No control feedback needed
2. No active power input
3. No abrasion, vibration or noise.
4. No Frictional Losses
5. High Operating Speeds upto 200000 RPM
5. Eco Friendly
6. Requires no Lubricants Disadvantages..! 1. Requires auxillary bearings at the start
2. High initial cost
3. Limited load capacity A magnetic bearing system..! Areas of application of
magnetic bearings..! 1. Electric power generation
2. Oil and Gas Industry
3. Zippe-type centrifuge
4. Turbo molecular pumps in Marine, Automobile, Aeroplane
5. Flywheel energy storage systems
6. Kinetic Energy Recovery System for Automotives and Trains
7. Medical, Electronics & process industry
8. Space Related Applications
9. Vaccum Pumps Conclusion..! Magnetic Bearing which is an application of Magnetic Levitation is a solution to the applications which require low operating temperature, less contamination, high operating speeds, less maintenance, low friction, less wear and tear, less vibrations, noise free operation etc., where conventional bearings fail to work. References..! Design and Analysis of a Novel Low Loss Homopolar Electrodynamic Bearing, Ph.D Thesis of Torbjörn A. Lembke
Magnetic Bearings, Theory and application to rotating machinery by Eric H. Maslen
Magnetal.se, Sweden Any Queries ? Types of Homo polar Electrodynamic Bearing... Outer Rotor Bearing Inner Rotor Bearing Intermediate Rotor Bearing
For any given operating point it is possible, according to the separation criterion, to compensate a static load in any direction with a counteracting force from permanent magnets alone without the introduction of any instability.
According to the Earnshaw stability criterion permanent magnets can also be used to achieve stability in all but one degree of freedom.
Thus, according to the same stability criterion, a stabilizing second derivative of the magnetic energy potential is required in at least one direction, and it has to be of non- magnetostatic nature.
A second derivative of an energy potential is a force derivative.
Eddy currents can provide stiffness, which is a force derivative of electrodynamic nature.
A force derivative does not require a non-zero force.
Without force there is no need for eddy currents.
Without eddy currents there are no losses. PRINCIPLE BEHIND ZERO LOSS BEARING OPERATION “Hope this technology will reach the market soon at a lower price with much more improvements done.” For Spindles & Turbines For Hollow Shafts and Pumps For Flywheels The Flying Byke Maglev Wind Turbine
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