Transportation Systems and TechnologyTransportation Systems and TechnologyСетевой электронный журнал "Транспортные системы и технологии"2413-9203Eco-Vector1042210.17816/transsyst2018435-25ReviewОбзорыResearch ArticleBearingless PM synchronous machine with zero-sequence current driven star point-connected active magnetic thrust bearingDietzDaniel
Germany

M.Sc.

ddietz@ew.tu-darmstadt.deBinderAndreas
Germany

Prof., Dr.-Ing. habil. Dr. h.c.

abinder@ew.tu-darmstadt.deInstitute of Electrical Energy Conversion – Darmstadt, Technical University02112018435250111201801112018Copyright ©; 2018, Dietz D., Binder A.Copyright ©; 2018, Dietz D., Binder A.2018Dietz D., Binder A.Dietz D., Binder A.http://creativecommons.org/licenses/by-nc-nd/4.0https://journals.eco-vector.com/transsyst/article/view/10422

Common cylindrical bearingless drives require a separate thrust bearing, which is fed by a DC supply. Here, a technique is presented, which enables the feeding of the thrust bearing by an artificially generated zero-sequence current between the two star points of the two parallel windings in the bearingless PM synchronous machine. This way, no additional DC supply for an axial active magnetic bearing is needed. It is replaced by two three-phase inverters as stator winding supply, which are needed in any case to generate torque and lateral rotor force in the motor. This examination explains the technique of adapting the electric potential of the star points in two three-phase windings of the motor. The focus is on the determination of the operating area (maximum zero-sequence current and band width). It is constrained by the bearingless motor due to torque and lateral force ripple as well as additional eddy current losses. On the other hand, the DC link voltage and the modulation degree of the inverter for simultaneous motor operation as well as the bearing inductance limit the system dynamic. It is shown that the proposed technique is applicable for a modulation degree < 0.866, taking into account that other constraints by the bearingless machine and the inverter are mainly noncritical.

bearingless drivecombined windingzero-sequence currentstar point-connected thrust bearingactive magnetic bearingChiba A, Fukao T, Ichikawa O, Oshima M, Takemoto M, Dorrell DG. Magnetic Bearings and Bearingless Drives. 1st ed. Oxford: Elsevier; 2005.Bleuler H, Cole M, Keogh P, Larsonneur R, Maslen E, Nordmann R, Okada Y, Schweitzer G, Traxler A. Magnetic Bearings – Theory, Design and Application to Rotating Machinery. Schweitzer G, Maslen EH., editors. Dordrecht Heidelberg London New York: Springer; 2009.Stölting HD, Kallenbach E, Amrhein W, editors. Handbook of Fractional-Horsepower Drives. Berlin Heidelberg New York: Springer; 2006.Messager G, Binder A. Evaluation of a Dual Half-Pitched Three-Phase Bearingless High-Speed Permanent Magnet Synchronous Motor Prototype. Proceedings of the10th ETG/GMM-Symposium Innovative small Drives and Micro-Motor Systems (IKMT); 2015 Sep 14–15; p. 1–6. Cologne, Germany. Berlin Offenbach: VDE Verlag GmbH; 2015.Schneider T, Binder A. Design and Evaluation of a 60 000 rpm Permanent Magnet Bearingless High Speed Motor. Proceedings of the 7th International Conference on Power Electronics and Drive Systems (PEDS); 2007 Nov 27–30; Bangkok, Thailand. IEEE; 2007. doi: 10.1109/peds.2007.4487669Jastrzebski RP, Jaatinen P, Pyrhönen O, Chiba A. Design of 6-slot inset PM bearingless motor for high-speed and higher than 100 kW applications. Proceedings of the 2017 IEEE International Electric Machines and Drives Conference (IEMDC); 2017 May 21–24; p. 1–6. Miami (FL), USA. IEEE; 2017. doi: 10.1109/iemdc.2017.8002143Wang T, Du G, Yu Z, Zhang F, Bai Z. Design and develop of a MW direct drive high-speed permanent-magnet machine for compression. Proceedings of the International Conference on Electrical Machines and Systems (ICEMS); 2013 Oct 26–29; p. 892–895. Busan, South Korea. IEEE; 2013. doi: 10.1109/icems.2013.6713160Mitterhofer H, Amrhein W. Motion control strategy and operational behaviour of a high speed bearingless disc drive. Proceedings of the 6th IET International Conference on Power Electronics, Machines and Drives (PEMD); 2012 Mar 27–29; p. 1–6. Bristol, UK. IET; 2012. doi: 10.1049/cp.2012.0297Bösch PN. Lagerlose Scheibenläufermotoren höherer Leistung(Bearingless disk-like Motors of higher Power Classes) [dissertation]. Zurich: Swiss Federal Institute of Technology (ETH); 2004.Asama J, Oi T, Oiwa T, Chiba A. Investigation of integrated winding configuration for a two-DOF controlled bearingless PM motor using one three-phase inverter. Proceedings of the 2017 IEEE International Electric Machines and Drives Conference (IEMDC); 2017 May 21–24; p. 1–6. Miami (FL), USA. IEEE; 2017. doi: 10.1109/iemdc.2017.8002219Grabner H, Silber S, Amrhein W. Feedback control of a novel bearingless torque motor using an extended FOC method for PMSMs. Proceedings of the IEEE International Conference on Industrial Technology (ICIT); 2013 Feb 25–28; p. 325–330. Cape Town, South Africa. IEEE; 2013. doi: 10.1109/icit.2013.6505693Steinert D, Nussbaumer T, Kolar JW. Slotless Bearingless Disk Drive for High-Speed and High-Purity Applications. IEEE Transactions on Industrial Electronics. 2014; 61(11):5974-5986. doi: 10.1109/TIE.2014.2311379Munteanu G, Binder A, Dewenter S. Five-axis magnetic suspension with two conical air gap bearingless PM synchronous half-motors. Proceedings of the International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM); 2012 Jun 20–22, p. 1246–1251. Sorrento, Italy. IEEE; 2012. doi: 10.1109/speedam.2012.6264414Kascak P, Jansen R, Dever T, Nagorny A, Loparo K. Levitation performance of two opposed permanent magnet pole-pair separated conical bearingless motors. Proceedings of the IEEE Energy Conversion Congress and Exposition; 2011 Sep 17–22; p. 1649–1656. Phoenix (AZ), USA. IEEE; 2011. doi: 10.1109/ecce.2011.6063980Schleicher A, Werner R. Theoretical and experimental analysis of controllability of a novel bearingless rotary-linear reluctance motor with optimal chessboard toothing. Proceedings of the IEEE International Conference on Industrial Technology (ICIT); 2018 Feb 20–22; p. 540–545. Lyon, France. IEEE; 2018. doi: 10.1109/icit.2018.8352234Sugimoto H, Srichiangsa T, Chiba A. Design of a high-speed single-drive bearingless motor. Proceedings of the IEEE International Electric Machines and Drives Conference (IEMDC); 2017 May 21–24; p. 1–6. Miami (FL), USA. IEEE; 2017. doi: 10.1109/iemdc.2017.8002300Gasch R, Nordmann R, Pfützner H. Rotordynamik (Rotor Dynamics). 2nd ed. Berlin, Heidelberg, New York: Springer; 2006.Munteanu G, Binder A, Schneider T. Development and test of high-speed bearingless PM synchronous machines. e & i Elektrotechnik und Informationstechnik. 2011;128(3):75-80. doi: 10.1007/s00502-011-0810-1Messager G, Binder A. Six-axis Rotor Magnetic Suspension Principle for Permanent Magnet Synchronous Motor with Control of the Positive, Negative and Zero-Sequence Current Components. Applied Computational Electromagnetics Society (ACES) Journal. 2017;32(8):657-662.Messager G, Binder A. Analytical comparison of conventional and modified winding for high speed bearingless permanent magnet synchronous motor applications. Proceedings of the International Conference on Optimization of Electrical and Electronic Equipment (OPTIM); 2014 May 22–24; p. 330–337. Bran, Romania. IEEE; 2014. doi: 10.1109/optim.2014.6850951Dietz D, Messager G, Binder A. 1 kW / 60000 min-1 bearingless PM motor with combined winding for torque and rotor suspension. IET Electric Power Applications. Forthcoming 2018. doi: 10.1049/iet-epa.2018.0013Schröder D. Elektrische Antriebe – Regelung von Antriebssystemen. 4th ed. Berlin Heidelberg: Springer Vieweg; 2015. doi: 10.1007/978-3-642-30096-7_7Binder A. Elektrische Maschinen und Antriebe – Grundlagen, Betriebsverhalten. 2nd ed. Heidelberg Dordrecht London New York: Springer; 2018.Sequenz H. Die Wicklungen elektrischer Maschinen. 1st ed. Vienna: Springer; 1950.Bergmann G. Five-Axis Rotor Magnetic Suspension with Bearingless PM Motor Levitation Systems [dissertation]. Darmstadt: Technical University; 2013.Binder A. Analytical Calculation of Eddy-Current Losses in Massive Rotor Parts of High-Speed Permanent Magnet Machines. Proceedings of the International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM); 2000 Jun 13–16, p. C2-1–C2-6. Ischia, Italy; 2000.Stoll RL. The analysis of eddy currents. Oxford: Clarendon Press; 1974.Greig J, Freeman EM. Travelling-wave problem in electrical machines. Proceedings of the Institution of Electrical Engineers. 1967;114(11):1681-1683, doi: 10.1049/piee.1967.0324