A hybrid magnetic bearing (HMB) with six poles is an effective construction of the magnetic bearing. It is energy efficient due to the presence of permanent magnets and it can be supplied from a three phase inverter. Unfortunately, the cross-coupling effect and nonlinearity of magnetic force occur in the 6-pole construction of the HMB. The purpose of this paper is to investigate the cross-coupling effect and nonlinearity of magnetic force as well as to propose two methods of reducing them. The proposed methods include division of the stator joke into three parts and exciting an additional current in one winding. Presented HMB was analysed with the 3D finite element method. The numerical model was verified by measurement.
SchweitzerG.MaslenH. and BearingsMagnetic, Theory, Design, and Application to Rotating Machinery, Springer, Berlin, 2009.
2.
GosiewskiZ. and MystkowskiA., Robust control of active magnetic suspension: Analytical and experimental results, Mechanical Systems and Signal Processing22 (2008), 1297–1303, doi:10.1016/j.ymssp.2007.08.005.
3.
ZhangW. and ZhuH., Radial magnetic bearings: An overview, Results in Physics7 (2017), 3756–3766, doi:10.1016/j.rinp.2017.08.043.
4.
JiL.XuL. and JinCh., Research on a low power consumption six-pole heteropolar hybrid magnetic bearing, IEEE Transactions on Magnetics49(8) (2013), 4918–4926, doi:10.1109/TMAG.2013.2238678.
5.
PolajzerB.StumbergerG. and RitonjaJ., Impact of magnetic nonlinearities and cross-coupling effects on properties of radial active magnetic bearings, IEEE Transactions on Magnetics40(2) (2004), 798–801, doi:10.1109/TMAG.2004.824581.
6.
MeekerD.C. and MaslenE.H., Analysis and control of a three pole radial magnetic bearing, in: Proceedings of Tenth International Symposium on Magnetic Bearings, Martigny, Switzerland, 2006.
7.
ZhuH.DingS. and JvJ., Modeling for three-pole radial hybrid magnetic bearing considering edge effect, Energies9(5) (2016), 345, doi:10.3390/en9050345.
8.
WangCh.FangJ.TangJ. and SunJ., Structure and coupling analysis of a novel 3-DOF conical magnetic bearing, International Journal of Applied Electromagnetics and Mechanics43 (2013), 389–401, doi:10.3233/JAE-131725.
9.
ZhongY.WuL.FangY. and HuangX., Investigation of cross-coupling effect of a 3-DOF magnetic bearing using magnetic circuit method, in: Proceedings of 20th International Conference on Electrical Machines and Systems, Sydney, Australia, 2017.
10.
ReisingerM.AmrheinW.SilberS.RedemannCh. and JenckelP., Development of a low cost permanent magnet biased bearing, in: Proc. of the 9th International Symposium on Magnetic Bearings, Lexington, Kentucky, 2004, pp. 113–118.
11.
AntilaM.LanttoE. and ArkkioA., Determination of forces and linearized parameters of radial active magnetic bearings by finite element technique, IEEE Transactions on Magnetics34(3) (1998), 684–694, doi:10.1109/20.668066.
12.
PolajzerB.StumbergerG.RitonjaJ. and DolinarD., Variations of active magnetic bearings linearized model parameters analyzed by finite element computation, IEEE Transactions on Magnetics44(6) (2008), 1534–1537, doi:10.1109/TMAG.2007.916650.
13.
WajnertD. and TomczukB., Simulation for the determination of the hybrid magnetic bearing’s electromagnetic parameters, Przegląd Elektrotechniczny (2017), 157–160, doi:10.15199/48.2017.02.34, ISSN 0033-2097, R. 93 NR.
14.
GierasJ.F.PiechZ.J. and TomczukB., Linear Synchronous Motor, Taylor & Francis, USA, 2011.
15.
TomczukB.KoterasD. and WaindokA., The influence of the leg cutting on the core losses in the amorphous modular transformers, Compel - the International Journal for Computation and Mathematics in Electrical and Electronic Engineering34(3) (2015), 840–850.
16.
LeY.FangJ. and WangK., Design and optimization of a radial magnetic bearing for high-speed motor with flexible rotor, IEEE Transactions on Magnetics51(6) (2015), 1–13, doi:10.1109/TMAG.2014.2386298.
