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“DESIGN OF ACTIVE MAGNETIC BEARING”

“DESIGN OF ACTIVE MAGNETIC BEARING”. Presented By JADHAV MANORANJAN A. Guided By Prof . S. B. BELKAR. Introduction. Magnetism Magnetic field. Magnetism Magnetic Flux Density. multiple loops of wire, n. B = magnetic flux density = magnetic permeability H = magnetic field.

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“DESIGN OF ACTIVE MAGNETIC BEARING”

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  1. “DESIGN OF ACTIVE MAGNETIC BEARING” Presented By JADHAV MANORANJAN A. Guided By Prof . S. B. BELKAR

  2. Introduction Magnetism Magnetic field

  3. Magnetism Magnetic Flux Density multiple loops of wire, n B = magnetic flux density • = magnetic permeability H = magnetic field m0 = permeability of free space mr = relative permeability diamagnetic paramagnetic ferromagnetic

  4. H i Magnetism Magnetic Field Magnetic field, H, is found around a magnet or a current carrying body. (for one current loop)

  5. Magnetism Lorentz Force f = force Q = electric charge E = electric field V = velocity of charge Q B = magnetic flux density

  6. Magnetism Lorentz Force Simplification: Source: MIT Physics Dept. website

  7. Magnetism Lorentz Force Analogous Wire Further simplification: B i f force perpendicular to flux!

  8. MAGNETIC BEARING • Bearingwhich supports a load using magnetic levitation Advantages of magnetic bearings: • contact-free • no lubricant • (no) maintenance • tolerable against heat, cold, vacuum, chemicals • low losses • very high rotational speeds Disadvantages: • complexity • high initial cost

  9. MAGNETIC BEARING TYPES • PASSIVE MAGNETIC BEARING Not electrically controlled, Permanent magnets • ACTIVE MAGNETIC BEARING Electrically controlled, Electromagnets

  10. Model of Active Magnetic Bearing • Principle of operation:Magnetic Levitation

  11. Active Magnetic Bearings Elements of System • Electromagnet • Rotor • Stator • Position Sensor • Controller • Amplifier

  12. Radial Bearing Configuration: • for radial force balancing • Axial Bearing Configuration: • for axial force balancing • Position Transducers:

  13. Auxiliary Bearing System

  14. Control system: • Sensors • Controller • Power Amplifiers

  15. Principle of radial and axial force Where ,

  16. magnetic flux in the air gap

  17. permeances of bias & axial control fluxes Pb & Px The axial force

  18. Analysis of AMB system using Finite Element Method

  19. Performance relative to hydrodynamic bearing

  20. ADVANTAGES OF AMB • NON CONTACT MOTION • HIGH ROTATING SPEED • NO LUBRICATION • INCREASE IN OPERATING TEMPERATURE RANGE • ACTIVE NATURE

  21. DISADVANTAGES OF AMB • NO LINEARITY • ROTOR HEATING • LARGER SIZE • HIGH COST

  22. APPLICATIONS OF AMB • Image display unit • High precision lathe • Turbo expander • Turbo compressor • High speed milling • Machine tool spindle • Maglev Trains

  23. Applications Maglev Trains Maglev = Magnetic Levitation • 150 mm levitation over guideway track • undisturbed from small obstacles (snow, debris, etc.) • typical ave. speed of 350 km/h (max 500 km/h) • what if? Paris-Moscow in 7 hr 10 min (2495 km)! • stator: track, rotor: magnets on train Source: DiscoveryChannel.com

  24. ApplicationsMaglev Trains Maglev in Shanghai - complete in 2004 - airport to financial district (30 km) - world‘s fastest maglev in commercial operation (501 km/h) - service speed of 430 km/h Source: www.monorails.org

  25. THANK YOU

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