Similar articles

Abstract: This paper addresses the bearingless motor with a single set of multiphase windings. The interaction between M and M±1 pole-pair magnetic fields produces radial force. Based on this principle, a bearingless machine is obtained. Conventional bearingless machine has dual windings, levitation windings and torque windings, which produce the two magnetic fields. In the proposed bearingless motor, the two needed magnetic fields are produced by feeding two groups of currents to a single set of multiphase windings. Taking a 5-phase induction motor as example, the inductance matrices, considering air gap eccentricity, are calculated with the modified winding function method. The radial force analytical model is deduced by virtual displacement, and its results are validated by FEA. The mathematical model of the new bearingless machine is set up, and the simulation results verified the feasibility of this novel bearingless motor.

[1] Chiba, A., Deido, T., Fukao, T., Rahman, M.A., 1994. An analysis of bearingless AC motors. IEEE Trans. on Energy Conv., 9(1):61-68.

[2] Chiba, A., Furuichi, R., Aikawa, Y., Shimada, K., Takamoto, Y., Fukao, T., 1997. Stable operation of induction-type bearingless motors under loaded conditions. IEEE Trans. on Ind. Appl., 33(4):919-924.

[3] Faiz, J., Tabatabaei, I., 2002. Extension of winding function theory for nonuniform air gap in electric machinery. IEEE Trans. on Magn., 38(6):3654-3657.

[4] Ferreira, J.M.S., Zucca, M., Salazar, A.O., Donadio, L., 2005. Analysis of bearingless machine with divided windings. IEEE Trans. on Magn., 41(10):3931-3933.

[5] Huang, J., 1994. Application of p-pair poles n-phase transformation in the analysis of synchronous machines with stator winding fault. Proc. CSEE, 14(5):10-17 (in Chinese).

[6] Khoo, S.W.K., 2005. Bridge configured winding for polyphase self-bearing machines. IEEE Trans. on Magn., 41(4):1289-1295.

[7] Levi, E., Jones, M., Vukosavic, S.N., Toliyat, H.A., 2004. A novel concept of a multiphase, multimotor vector controlled drive system supplied from a single voltage source inverter. IEEE Trans. on Power Electr., 19(2):320-335.

[8] Luo, X.G., Liao, Y.F., Toliyat, H.A., EI-Anatbly, A., Lipo, T.A., 1995. Multiple coupled circuit modeling of induction machines. IEEE Trans. on Ind. Appl., 31(2):311-318.

[9] Nomura, S., Chiba, A., Nakamura, F., Ikeda, K., Fukao, T., Rahman, M.A., 1993. A Radial Position Control of Induction Type Bearingless Motor Considering Phase Delay Caused by the Rotor Squirrel Cage. IEEE Power Conversion Conference. Yokohama, Japan, p.438-443.

[10] Okada, Y., Dejima, K., Ohishi, T., 1995. Analysis and comparison of PM synchronous motor and induction motor type magnetic bearing. IEEE Trans. on Ind. Appl., 31(5):1047-1053.

[11] Osama, M., Lipo, T.A., 1997. Modeling and analysis of a wide speed-range induction motor drive based on electronic pole changing. IEEE Trans. on Ind. Appl., 33(5):1177-1184.

[12] Osama, M., Lipo, T.A., 1999. A Magnetic Relief Scheme for Four Pole Induction Motors. Conference on Electrical Machines, Converters and Systems. Lisbon, Portugal, p.I15-I21.

[13] Suzuki, T., Chiba, A., Rahman, M.A., Fukao, T., 2000. An air-gap flux-oriented vector controller for stable operation of bearingless induction motors. IEEE Trans. on Ind. Appl., 36(4):1069-1076.

[14] Xu, H., Toliyat, H.A., Petersen, L.J., 2001. Rotor Field Oriented Control of a Five-Phase Induction Motor with the Combined Fundamental and Third Harmonic Currents. Applied Power Electronics Conference and Exposition, p.392-398.