Starting Characteristic Analysis of LSPM for Pumping System Considering Demagnetization

Authors: Subrato Saha, Yun-Hyun Cho

Abstract:

This paper presents the design process of a high performance 3-phase 3.7 kW 2-pole line start permanent magnet synchronous motor for pumping system. A method was proposed to study the starting torque characteristics considering line start with high inertia load. A d-q model including cage was built to study the synchronization capability. Time-stepping finite element method analysis was utilized to accurately predict the dynamic and transient performance, efficiency, starting current, speed curve and etc. Considering the load torque of pumps during starting stage, the rotor bar was designed with minimum demagnetization of permanent magnet caused by huge starting current.

Keywords: LSPM, starting analysis, demagnetization, FEA, pumping system.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1108186

References:

[1] M.A Rahman and T.M. Osheiba, "Performance of a large line start permanent magnet synchronous motor", IEEE Trans. Energy Conversion, vol. 5, pp.211-217, Mar.1990.
[2] T.J.E. Miller, "Synchronization of line-start permanent magnet AC motor", IEEE Trans. Industry Application, vol.PAS-103, Juillet 1984, pp 1822-1828.
[3] Li Gies, GuoZhongbao, Wang Chunyuan, Giu Hong, GuoDaling, "High Starting Torque and High Efficiency REPM Synchronous Motor", Proceeding of the Seventh International Workshop on Rare Earth-Cobalt Permanent Magnets and Their Applications, Beijing, China, Sept. 1983, Chana Academic Publishers, pp.13-20.
[4] A. Takahashi, S. Kikuchi, K. Miyata, S. Wakui, H. Mikami, and A. Binder, “Transient-torque analysis for line-starting permanent-magnet synchronous motors”, Proceeding of the 2008 International Conferences on Electrical Machines, Beijing, China, Sept. 1983, Chana Academic Publishers, pp.13-20.
[5] G.H. Kang, J. Hur, H. Nam, J.P. Hong and G.T. Kim “Analysis of irreversible magnet demagnetization in line-start motors based on the finite-element method”, IEEE Trans. On Magn., vol.39, no.3, pp.1488~1491, May, 2003.
[6] W.H Kim, K.C Kim “A study on the optimal rotor design of LSPM considering the starting torque and efficiency”, IEEE Trans. on magn., Vol.45,No.3, March 2009
[7] Tingting Ding , Takorabet N.,Sargos F-M, Xiuhe Wang, “ Design and Analysis of different line start PM synchronous motor for oil-pump applications”, IEEE Trans. on magn.,Vol.45, No.3, March 2009
[8] T. J. E. Miller, “Synchronization of line-start permanent magnet AC motors,” IEEE Trans. Power App. Syst., vol. PAS-103, no. 7, pp. 1822– 1828, Jul 1984.
[9] J. Soulard and H. P. Nee, “Study of the synchronization of line-start permanent magnet synchronous motors,” in Proc. IEEE Ind. Applicat. Soc. Annu. Meeting, Roma, Italy, 2000, pp. 424–431.
[10] V. B. Honsinger, “Permanent magnet machines: Asynchronous operation,” IEEE Trans. Power App. Syst., vol. PAS-99, no. 7, pp. 1503–1509, Jul. 1980.