Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Design of Combined Radial and Axial 4-pole Electromagnetic Bearing (I) - with Uncoupled Bias Flux -

반경방향-축방향 일체형 4극 전자기 베어링의 설계 (I) - 바이어스 자속 독립형 -

  • Published : 2005.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a new compact active magnetic bearing(AMB) is proposed in which radial and axial bearings are integrated in one bearing unit. It consists of four U-shaped cores circumferentially connected by yokes and two-layer coils for radial and axial controls. For the radial control action, it has the same principle as conventional homopolar AMBs, while for the axial control, it uses the Lorentz force generated by the interaction of the bias flux for radial control and the axial control flux. The proposed structure makes it easy to design a compact AMB because it has no disk for axial control. This paper introduces the proposed structure, principle, and design process based on the magnetic flux analysis. By using a control algorithm with feedforward action to compensate the coupled flux effect, the feasibility of the proposed AMB is experimentally verified.

Keywords

References

  1. Lee, C.W. and Jeong, H.S., 1996, 'Dynamic Modeling and Optimal Control of Cone-Shaped Active Magnetic Bearing System,' Control Engineering Practice, 4, pp. 1393-1403 https://doi.org/10.1016/0967-0661(96)00149-9
  2. Sortore, C.K., Allaire, P.E., Maslen, E.H., Humphris, R.R. and Studer, P.A., 1990, 'Permanent Magnet Biased Magnetic Bearings-Design, Construction and Testing,' 2nd Int. Sym. on Magnetic Bearings, Tokyo, Japan, pp. 12-14
  3. Komori, M. and Yamane, T., 2000, 'Magnetic Levitation System with a Millimeter Sized Cylindrical Rotor,' Mechatronics, 10, pp. 595-607 https://doi.org/10.1016/S0957-4158(99)00088-4
  4. Han, W. S., Lee, C. W. and Okada, Y., 2002, 'Design and Control of a Disk-Type Integrated Motor-Bearing System,' IEEE/ASME transactions on mechatronics, 7(1), pp. 15-22 https://doi.org/10.1109/3516.990883
  5. Kim, S. J., Abe, K., Kanebako, H., Okada, Y. and Lee, C. W., 2002, 'A Lorentz Force Type Self-Bearing Motor with New 4-Pole Winding Configuration,' 8th Int. Sym. on Magnetic Bearings, Mito, Japan, pp. 35-40
  6. Kim, H. Y. and Lee, C. W., 2003, 'Design and Control of Active Magnetic Bearing System with Lorentz Force-type Axial Actuator,' ASME2003 Design Engineering Technical Conferences and Computers and lnformation in Engineering Conference, Chicago, Illinois, USA, September, 48542