Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
권호 표지

A Comparison of Separated and Combined Winding Concepts for Bearingless Centrifugal Pumps

  • Published : 2009.03.20
Download PDF
⟨ Previous Next ⟩

Abstract

Bearingless centrifugal pump systems are employed in the semiconductor, pharmaceutical and medical industries due to their facility for pumping high purity fluids without particle contamination. Two types of forces have to be generated by the stator units, namely bearing forces for achieving magnetic levitation, and drive forces for producing the needed pump torque. The generation of these forces requires bearing and drive windings, which can be realized as separate bearing and drive coils or as identical, combined coils on the stator claws. In this paper, a detailed comparison between these two winding concepts is undertaken, whereby the copper losses, the power electronics losses, and the achievable pump output pressure are evaluated for both concepts. For each criterion a ratio of improvement is calculated analytically which allows evaluation of the performance of the two winding concepts for any given pump operating point and design. Finally, also practical features such as control complexity, cabling effort and manufacturability are discussed and measurements on prototype systems are carried out to validate the considerations.

Keywords

References

  1. A. Chiba, T. Fukao, O. Ichikawa, M. Oshima, M. Takemoto, and D. G. Dorrell, Magnetic Bearings and Bearingless Drives. Elsevier, 2004
  2. M. Neff, "Bearingless pump system for the semiconductor industry", in 6th International Symposium on Magnetic Suspension Technology, pp. 169-173, 2001
  3. R. Schoeb, "Centrifugal pump without bearings or seals", World Pumps, Vol. 430, pp. 34-37, 2002 https://doi.org/10.1016/S0262-1762(02)80218-8
  4. T. Nussbaumer, K Raggl, P. Boesch, and J.W.Kolar, "Trends in integration for magnetically levitated pump systems", in PCC Nagoya, pp. 1551-1558, 2-5 April 2007
  5. M. Bartholet, S. Silber, T. Nussbaumer, and J. Kolar, "Performance investigation of two-, three- and four-phase bearingless slice motor configurations", in Power Electronics and Drive Systems. 2007. PEDS '07. 7th International Conference on, pp. 9-16, 27-30 Nov. 2007
  6. K.-Y. Cho, "Sensorless Control for a PM Synchronous Motor in a Single Piston Rotary Compressor", Journal of Power Electronics, Vol. 6, No.1, pp.29-37, 2006
  7. Y. Yamamoto, H. Funato, and S.Ogasawara, "Hybrid Sensor-less Control of Permanent Magnet Synchronous Motor in Low-speed Region", Journal of Power Electronics, Vol. 8, pp. 301-308, 2008
  8. S.-C. Yoon and J.-M. Kim, "Sensorless control of a pmsm at low speeds using high frequency voltage injection", Journal of Power Electronics, Vol. 5, pp. 11-19, 2005
  9. T. Tera, Y. Yamauchi, A. Chiba, T. Fukao, and M. A. Rahman, "Performances of bearingless and sensorless induction motor drive based on mutual inductances and rotor displacements estimation", IEEE Transactions on Industrial Electronics, vol. 53, pp. 187-194, 2006 https://doi.org/10.1109/TIE.2005.862297
  10. K. Raggl, T. Nussbaumer, and J. W. Kolar, "Comparison of Winding Concepts for Bearingless Pumps", in ICPE, 2007
  11. M. Neff, "Bearingless centrifugal pump for highly pure chemicals", in Proc. 8th ISMB, pp. 283-287, Aug. 2002
  12. R. Schoeb, "Principle and application of a bearingless slice motor", JSME International Journal, Vol. 40, No.4, pp. 593-598, 1997
  13. G. Schweitzer, "Active magnetic bearings chances and limitations", 6th International Conference on Rotor Dynamics, pp. 1-14, Oct. 2002
  14. J. Bichsel, "The bearingIess electrical machine", International Symposium on Magnetic Suspension Technology, Vol. 2, pp. 1-14, Aug. 19-23 1991
  15. H. Zhu, Q. Cheng, Q. Wu, and W. Pan, "Radial Suspension Force Control of Bearingless Motor with Flux Equivalent Air-Gap Virtual Winding Current", in 11th International Symposium on Magnetic Bearings, ISMB11, Japan, 2008
  16. M. Oshima, S. Miyazawa, T. Deido, A. Chiba, F. Nakamura, and T. Fukao, "Characteristics of a permanent magnet type bearingless motor", in Industry Applications Society Annual Meeting, 1994., Conference Record of the 1994 IEEE, pp. 196-202 Vol.1, 2-6 Oct. 1994
  17. M. Oshima, A. Chiba, T. Fukao, and M. Rahman, "Design and analysis of permanent magnet-type bearingless motors," Industrial Electronics, IEEE Transactions on, Vol. 43, No.2, pp. 292-299, Apr 1996 https://doi.org/10.1109/41.491353
  18. B. Singh and S. Singh, "State-of-Art on Permanent Magnet Brushless DC Motor Drives," Journal of Power Electronics, Vol. 9, pp.1-17, 2009
  19. H. Wang, D.-H. Lee, and J.-W. Ahn, "Calculation of Suspending Force for New Bearingless Switched Reluctance Motor", in 11th International Symposium on Magnetic Bearings, ISMB11, Japan, 2008
  20. A. Chiba, R. Furuichi, Y. Aikawa, K. Shimada, Y. Takamoto, and T. Fukao, "Stable operation of induction-type bearingless motors under loaded conditions", Industry Applications, IEEE Transactions on, Vol. 33, No.4, pp. 919-924, Jul/Aug 1997 https://doi.org/10.1109/28.605733
  21. A. Chiba, D. Akamatsu, T. Fukao, and M. Azizur Rahman, "An improved rotor resistance identification method for magnetic field regulation in bearingless induction motor drives", Industrial Electronics, IEEE Transactions on, Vol. 55, No.2, pp. 852-860, Feb. 2008 https://doi.org/10.1109/TIE.2007.911197
  22. S. Silber, W. Amrhein, P. Bosch, R. Schob, and N. Barletta, "Design aspects of bearingless slice motors", IEEE/ASME Transactions on Mechatronics, Vol. 10, No.6, pp. 611-617, 2005 https://doi.org/10.1109/TMECH.2005.859813
  23. W. Amrhein, S. Silber, and K. Nenninger, "Levitation forces in bearingless permanent magnet motors", IEEE Transactions on Magnetics, Vol. 35, No.5, pp. 4052-4054, 1999 https://doi.org/10.1109/20.800752
  24. Y. Okada, K. Dejima, and T.Ohishi, "Analysis and comparison of pm synchronous motor and induction motor type magnetic bearings", Industry Applications, IEEE Transactions on, Vol. 31, No.5, pp. 1047-1053, Sep/Oct. 1995 https://doi.org/10.1109/28.464518
  25. Y. Okada, S. Miyamoto, and T. Ohishi, "Levitation and torque control of internal permanent magnet type bearingless motor", Control Systems Technology, IEEE Transactions on, Vol. 4, No.5, pp. 565-571, Sep. 1996 https://doi.org/10.1109/87.531922
  26. W. K. S. Khoo, R. L. Fittro, and S. D. Garvey, "AC polyphase self-bearing motors with a bridge configured winding," in Proc. 8th Int. Symp. Magnetic Bearings, Mito, Japan, pp. 47-52, Aug. 2002
  27. W. K. S. Khoo, "Bridge Configured Winding for Polyphase Self-Bearing Machines", IEEE Transactions on Magnetics, Vol. 41, No.4, pp. 1289-1295, April 2005 https://doi.org/10.1109/TMAG.2005.845837
  28. J. A. D. Paiva, A. O. S. A. L. Maitelli, and R. M. Stephan, "Performance Improvement of a Split Winding Bearingless Induction Machine Based on A Neural Network Flux Observer", in 11th International Symposium on Magnetic Bearings, ISMB11, Japan, 2008
  29. K. KuepfmueUer, Einfuehrung in die theoretische Elektrotechnik. Springer Verlag Berlin, Vol. 11. Auflage, 1984