Mathematical model of radial passive magnetic bearing

• Autorzy: Matuszewski L. , Falkowski K.
• Języki publikacji: EN

Abstrakty

EN

In the article a mathematical model of radial passive magnetic bearings applicable to ocean engineering units has been presented. The application of the bearings in ship thrusters should increase durability of propulsion systems and give lower maintenance costs. The rotor of thruster’s electric motor is suspended in magnetic field generated by radial passive magnetic bearings. However the maintaining of axial direction of the rotor must be controlled with electromagnets equipped with a high-dynamic controller. The risk of application of the magnetic bearings results from very low stiffness of the unit in comparison with rolling bearings. Also construction of the bearing should be different due to gyroscope effect and high forces generated during ship manoeuvring. The physical model performs correctly if electromagnets are controlled properly; and, technological problem with sealing system seems more significant than power supply to electromagnets winding. The equations presented in the article are necessary to build algorithms of a digital controller intended for on-line controlling magnetic bearing in axial direction.

Słowa kluczowe

EN

propeller; ring motor; magnetic bearing

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2010
• Tom: nr 3
• Strony: 37--44
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Matuszewski L.

autor

Falkowski K.

• Faculty of Ocean Engineering and Ship Technology Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk, POLAND,

Bibliografia

• 1. ISO14839-2:2004 Standard: Mechanical vibration –Vibration of rotating machinery equipped with active magnetic bearings. Part 2: Evaluation of vibration. Edition: 1 | Stage: 90.93 | TC 108/SC 2 ICS: 17.160
• 2. D. Griffiths: Introduction to Electrodynamics. Prince Hall, Upper Saddle River, New Jersey 07458, USA, 1999
• 3. Gosiewski Z., Falkowski K.: Multifunctional magnetic bearings. Monograph. Wydawnictwo Naukowe Instytutu Lotnictwa (Scientific Publishing House of Aviation Institute), Warsaw, 2003
• 4. Falkowski K.: Modelling passive magnetic bearings (in Polish). The Conference Automaticon 2006, Warsaw, March 2006
• 5. Falkowski K., Gosiewski Z.: Analytical Method of the Magnetic Forces Estimation in Passive Magnetic Bearings. The 8th International Conference on Motion and Vibration – Control MOVIC 2006, Korea, September 2006
• 6. Falkowski K.: Passive magnetic bearing (in Polish). The Conference Automaticon 2007, electronically edited proceedings, Warsaw, March 2007
• 7. Falkowski K., Gosiewski Z.: The differential passive magnetic bearing for high-speed flexible rotor. The 3rd International Conference on Mechatronic Systems and Materials (MSM 2007), 27 - 29 September, 2007, Kaunas, Lithuania, Published in the Solid State Phenomena Journal, Special topic volume on Mechatronic Systems and Materials II, Vol. 144, 2009.
• 8. Jarzyna H., Koronowicz T., Szantyr J.,A.: Design of Marine Propellers. Maszyny Przepływowe, vol.20, Ossolineum 1996.