This paper presents the design and development of a hybrid bearing set for complete passive levitation of a typical rotor. A hybrid bearing set consists of permanent magnet thrust bearing and radial discrete bump foil bearings. The permanent magnet thrust bearing is made up of three pairs of ring magnets arranged in rotation magnetized direction. The mathematical model to determine the force and stiffness in rotation magnetized direction configuration is presented using Coulombian model and vector approach. Bump foil bearings are designed and developed for rotor weight to provide the radial support to the rotor system. The proposed bearing set with rotor is analysed using finite element analysis for rotor dynamic characteristics. The experiments are conducted on the fabricated rotor-bearing configuration by rotating the rotor up to the speeds of 40,000 r/min. The system response is acquired using advanced rotor-dynamic data acquisition system. The experimental results show that the rotor is completely airborne and stable at the desired speed.
Siebert M, Ebihara B and Jansen R. A passive magnetic bearing flywheel. Report no. NASA/TM—2002-211159, 2002.
2.
MukhopadhayaSCDonladsonJSenguptaGet al.Fabrication of a repulsive-type magnetic bearing using a novel arrangement of permanent magnets for vertical-rotor suspension. IEEE Trans Magn2003; 39: 3220–3222.
3.
HussienAAYamadaSIwaharaMet al.Application of the repulsive-type magnetic bearing for manufacturing micromass measurement balance equipment. IEEE Trans Magn2005; 41: 3802–3804.
4.
SoteloGAndradeRFerreiraACet al.Magnetic bearing sets for a flywheel system. IEEE Trans Appl Supcond2007; 17: 2150–2153.
5.
Lijesh KP and Hirani H. Magnetic bearing using rotation magnetized direction configuration. ASME J Tribol 2015; 137: 042201(1-11).
6.
GuilhermeGSAndradeRFerreiraAC. Magnetic bearing sets for a flywheel system. IEEE Trans Appl Supcond2005; 15: 2245–2248.
7.
JianchengFWangCTangJ. Modeling and analysis of a novel conical magnetic bearing for Vernier-gimballing magnetically suspended flywheel. Proc IMechE, Part C: J Mechanical Engineering Science2014; 228: 2416–2425.
8.
JinjiSYuanRJianchengFet al.Passive axial magnetic bearing with Halbach magnetized array in magnetically suspended control moment gyro application. J Magn Magnt Mater2011; 323: 2103–2107.
9.
Jungmayr G, Marth E, Panholzer M, et al. Design of a highly reliable fan with magnetic bearings. Proc IMechE, Part I: J Systems and Control Engineering. 2016; 230: 361–369.
10.
Bekinal SI, Anil TR, Kulkarni SS et al. Hybrid permanent magnet and foil bearing system for complete passive levitation of rotor. In: 10th international conference on vibration engineering and technology of machinery, University of Manchester, UK, 9–11 September 2015, pp.939–949. Switzerland: Mechanisms and Machine Science 23, Springer International Publishing.
11.
OhjiTIchiyamaSAmeiKet al.Conveyance test by oscillation and rotation to a permanent magnet repulsive-type conveyor. IEEE Trans Magn2004; 40: 3057–3059.
12.
SamantaPHiraniH. Magnetic bearing configurations: theoretical and experimental studies. IEEE Trans Magn2008; 44: 292–300.
13.
RavaudRLemarquandGLemarquandV. Force and stiffness of passive magnetic bearings using permanent magnets. Part 1: axial magnetization. IEEE Trans Magn2009; 45: 2996–3002.
14.
RavaudRLemarquandGLemarquandV. Force and stiffness of passive magnetic bearings using permanent magnets. Part 2: radial magnetization. IEEE Trans Magn2009; 45: 3334–3342.
15.
JiangSLiangYWangH. A simplified method of calculating axial force for a permanent magnetic bearing. Proc IMechE, Part C: J Mechanical Engineering Science2010; 224: 703–708.
16.
BekinalSIAnilTRJanaS. Analysis of the magnetic field created by permanent magnet rings in permanent magnet rings. Int J Appl Electromagn Mech2014; 46: 255–269.
17.
BekinalSIAnilTRJanaS. Analysis of axially magnetized permanent magnet bearing characteristics. Prog Electromag Res B2012; 44: 327–343.
18.
BekinalSIAnilTRJanaS. Analysis of radial magnetized permanent magnet bearing characteristics for five degrees of freedom. Prog Electro Res B2013; 52: 307–326.
19.
BekinalSIAnilTRJanaSet al.Permanent magnet thrust bearing: theoretical and experimental results. Prog Electro Res B2013; 56: 269–287.
20.
EarnshawS. On the nature of the molecular forces which regulate the constitution of the luminiferous ether. Trans Camb Philol Soc1842; 7: 97–112.
HeshmatH. Operation of foil bearing beyond the bending critical mode. ASME J Tribol2000; 122: 192–198.
23.
Gray S. Applying resilient foil air bearings to turbomachinery – techniques and challenges. SAE Tech paper no. 751070, 1975.
24.
Badgley RH and Reddecliff J. Evaluation of a gas-lubricated foil bearing for control of gas turbine engine rotor critical speeds. SAE Tech. paper no. 751072, 1975.
25.
DellaCorteCZaldanaARRadilKC. A systems approach to the solid lubrication of foil air bearings for oil-free turbomachinery. ASME J Tribol2004; 126: 200–207.
26.
DellaCorteCRadilKCBrucknerRJet al.Design, fabrication and performance of open source generation I and II compliant hydrodynamic gas foil bearings. Tribol Trans2008; 51: 254–264.
27.
DellaCorte C. Oil-free shaft support system rotor dynamics: past, present, and future challenges and opportunities. Report no. NASA/TM – 2170032011, 2011.
