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Design and analysis of a new permanent magnet biased integrated radial-axial magnetic bearing

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Abstract

A typical magnetic bearing system is composed of two radial magnetic bearings and an axial magnetic bearing. The axial magnetic bearing with a large axial disk usually limits rotor dynamic performance and makes assembling and disassembling difficult for maintenance work. This paper proposes a novel permanent magnet biased integrated radial-axial magnetic bearing without axial disk. The axial magnetic bearing unit in this integrated magnetic bearing utilizes reluctance forces such that the axial disk can be removed from the bearing unit. The 4-pole homopolar type radial magnetic bearing unit is also designed and analyzed. 3-D flux analysis is provided to illustrate the novel diskless integrated magnetic bearing.

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Abbreviations

a 0 :

radial pole face area

g 0 :

nominal air gap for radial magnetic bearing unit

n :

number of coil turns for radial magnetic bearing unit

n a :

number of coil turns for axial magnetic bearing unit

x, y, z :

rotor displacement

F x , F y , F z :

magnetic forces along the x, y, z directions

i cx ,i cy ,i cz :

control currents for x, y, z directions

K p :

position stiffness for x, y directions

K i :

current stiffness for x, y directions

\(\hat K_p \) :

position stiffness for z directions

\(\hat K_i \) :

current stiffness for z directions

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Kyungnam University, 449, Wolyoung-dong, Hoewon-gu, Changwon, South Korea, 631-701

    Uhn Joo Na

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  1. Uhn Joo Na
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Correspondence to Uhn Joo Na.

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Na, U.J. Design and analysis of a new permanent magnet biased integrated radial-axial magnetic bearing. Int. J. Precis. Eng. Manuf. 13, 133–136 (2012). https://doi.org/10.1007/s12541-012-0018-2

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  • DOI: https://doi.org/10.1007/s12541-012-0018-2

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