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Magnetic Bearings !
Transcript of Magnetic Bearings !
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