1 / 25

“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.

conan-brewer
Download Presentation

“DESIGN OF ACTIVE MAGNETIC BEARING”

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related