Abstract
High integration, low loss and high-reliability are the main development trends of flywheel battery. Thus this study presents the first prototype of a novel high-integration four degrees of freedom (4-DOF) bearingless motor with the advantages of weak coupling and low power consumption. The proposed bearingless motor can realize energy conversion and produce 4-DOF radial forces compared with the conventional bearingless motor for improving the integration of system. A biased flux for producing radial levitation forces is provided by the permanent magnets, which reduce the power consumption of the system. Moreover, a decoupling between the torque and the suspension systems is realized through a structural design, thereby improving the controllability. Structure and winding configurations are introduced and the operation principle of the 4-DOF bearingless motor is discussed. Magnetic circuits analysis and parameter design method are present and a three-dimensional finite element model is established. Electromagnetic characteristics that focus on the high integration, low loss and high reliability are discussed and validated comprehensively. Finally, a favorable controllability of radial suspension forces are verified using finite-element analysis and some experimental results.
Similar content being viewed by others
References
Severson E, Nilssen R, Undeland T et al (2015) Magnetic equivalent circuit modeling of the AC homopolar machine for flywheel energy storage. IEEE Trans Energy Convers 30(4):1670–1678
Sarkar S, Ajjarapu V (2011) MW resource assessment model for a hybrid energy conversion system with wind and solar resources. IEEE Trans Sustain Energy 2(4):383–391
Casella F (2004) Modeling, simulation, control, and optimization of a geothermal power plant. IEEE Trans Energy Convers 19(1):170–178
Yuan Y, Sun Y, Huang Y (2016) Accurate mathematical model of bearingless flywheel motor based on Maxwell tensor method. Electron Lett 52(11):950–952
Zhan C, Tseng K (2007) A novel flywheel energy storage system with partially-self-bearing flywheel-rotor. IEEE Trans Energy Convers 22(2):477–487
Subkhan M, Komori M (2011) New concept for flywheel energy storage system using SMB and PMB. IEEE Trans Appl Supercond 21(3):1485–1488
Wei K, Liu D, Meng J (2010) Design and Simulation of a 12-Phase flywheel energy storage generator system with linearly dynamic load. IEEE Trans Appl Supercond 20(3):1050–1055
Cimuca G, Breban S, Mircea M (2010) Design and control strategies of an induction-machine-based flywheel energy storage system associated to a variable-speed wind generator. IEEE Trans Energy Convers 25(2):526–534
Lin C, Wang S, Moallem M et al (2017) Analysis of vibration in permanent magnet synchronous machines due to variable speed drives. IEEE Trans Energy Convers 32(2):582–590
Dong J, Jiang J, Howey B et al (2017) Hybrid acoustic noise analysis approach of conventional and mutually coupled switched reluctance motors. IEEE Trans Energy Convers 32(3):1042–1051
Eric S, Robert N, Tore U et al (2015) Magnetic equivalent circuit modeling of the AC homopolar machine for flywheel energy storage. IEEE Trans Energy Convers 30(4):1670–1678
Yuan Y, Sun Y, Huang Y (2016) Design and analysis of bearingless flywheel motor specially for flywheel energy storage. Electron Lett 52(1):60–62
Morrison C, Siebert M, Ho E (2008) electromagnetic forces in a hybrid magnetic-bearing switched-reluctance motor. IEEE Trans Magn 44(12):4626–4638
Takemoto M, Chiba A, Akagi H (2004) Radial force and torque of a bearingless switched reluctance motor operating in a region of magnetic saturation. IEEE Trans Ind Appl 40(1):103–112
Chen L, Hofmann W (2010) Design procedure of bearingless high speed switched reluctance motors. In: Int. Symp. on power electronics electrical drives automation and motion, Pisa, Italy, pp 1442–1447, June 2010
Liu W, Yang S (2005) Modeling and control of a self-bearing switched reluctance motor. In: Proc. IEEE IAS annual meeting, Kowloon, Hong Kong, pp 2720–2725, 2005
Cao X, Zhou J, Liu C (2017) Advanced control method for single-winding bearingless switched reluctance motor to reduce torque ripple and radial displacement. IEEE Trans Energy Convers 32(4):1533–1543
Wang H, Wang Y, Liu X (2012) Design of novel bearingless switched reluctance motor. IET Electr Power Appl 6(2):73–81
Xu Z, Lee D, Zhang F (2011) Hybrid pole type bearingless switched reluctance motor with short flux path. In: 2011 Int. Conf. on electrical machines and systems, Yichang, China, pp 1–6, 2011
Acknowledgements
This work was supported by the National Natural Science Foundation of China (51707082, 51877101, 51475452), Natural Science Foundation of Jiangsu Province (BK20170546, BK20150510), China Postdoctoral Science Foundation (2017M620192) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yuan, Y., Sun, Y., Xiang, Q. et al. The Study of Switched Reluctance Motor for 4-DOF Bearingless Motor. J. Electr. Eng. Technol. 14, 179–189 (2019). https://doi.org/10.1007/s42835-018-00051-3
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s42835-018-00051-3