Effective Design Parameters on the End Effect in Single-Sided Linear Induction Motors

Linear induction motors are used in various industries but they have some specific phenomena which are the causes for some problems. The most important phenomenon is called end effect. End effect decreases efficiency, power factor and output force and unbalances the phase currents. This phenomenon is more important in medium and high speeds machines. In this paper a factor, EEF , is obtained by an accurate equivalent circuit model, to determine the end effect intensity. In this way, all of effective design parameters on end effect is described. Accuracy of this equivalent circuit model is evaluated by two dimensional finite-element analysis using ANSYS. The results show the accuracy of the equivalent circuit model.




References:
[1] J. F. Gieras, Linear Induction Drives. Oxford, U.K.: New Clarendon
Press, 1994.
[2] M. Mirsalim, A. Doroudi,; J.S. Moghani, "Obtaining the operating
characteristics of linear induction motors: a new approach" IEEE Trans.
Magn. Vol.38, pp:1365-1370. Issue:2, March 2002.
[3] J. F. Eastham, "Novel synchronous machines: Linear and disc," Proc.
Inst. Elect. Energ., vol. 137, pp. 49-58, Jan. 1990.
[4] T. Koseki , S. Sone, "Investigation of secondary slot pitches of a cagetype
linear induction motor," IEEE Trans. Magn., vol. 29, no. 6, pp.
2944-2946, Nov. 1993.
[5] W. Xu, G. Sun, Y, Li,; "Research on Performance Characteristics of
Linear Induction Motor" IEEE Industrial electronics and applications
conf. 2007 pp.86-88.
[6] R.C. Creppe, J.A.C. Ulson, J.F. Rodrigues,; "Influence of Design
Parameters on Linear Induction Motor End Effect" IEEE Trans.
Ener.Conv .vol.23 no.2 pp. 358-362, June. 2008.
[7] K. Idir, G.E. Dawson, A. R. Eastham; "Modeling and Performance of
Linear Induction Motor with Saturable Primary" IEEE Trans. Indus.
vol.29, no.6, pp. 1123-1128, Nov. 1993.
[8] T. Yamaguchi, Y. Kawase, M. Yoshida, Y. Saito; Ohdachi, Y.; "3-D
Finite Element Analysis of a Linear Induction Motor" IEEE Trans.
Magn. vol.37, no.5, pp: 3668-3671. Sep 2001.
[9] Y. Nozaki, T. Koseki, E. Masada; "Analysis of Linear Induction Motors
for HSST and Linear Metro using Finite Difference Method" Proc. of
the 5th International Symposium on Linear Drives for Industry
Applications, pp: 168-171, LDIA2005.
[10] N. Fujii , T. Harada, "A New Viewpoint of End Effect of Linear
Induction Motor from Secondary Side in Ladder Type Model" IEEE
Trans. Magn., vol. 35, no. 5, pp. 4040-4042, Sep. 1993.
[11] A. H. Selçuk , H. Kürüm, "Investigation of End Effects in Linear
Induction Motors by Using the Finite-Element Method" IEEE Trans.
Magn., vol. 44, no. 7, pp. 1791-1795, July. 2008.
[12] N. Fujii, T. Kayasuga, T. Hoshi, "Simple End Effect Compensator for
Linear Induction Motor" IEEE Trans. Magn., vol. 38, no. 5, pp. 3270-
3272, Sep. 2002.
[13] R. C. Creppe, J. A. C. Ulson, J. F. Rodrigues, "Influence of Design
Parameters on Linear Induction Motor End Effect" IEEE Energy Conv.
Magn., vol. 23, no. 2, pp. 3270-3272, June. 2008.
[14] J.H. Sung, K. Nam, "A New Approach to Vector Control for a Linear
Induction Motor Considering End Effects," IEEE IAS annual meeting,
pp.2284-2289, 1999.
[15] J. Duncan, "Linear induction motorÔÇöEquivalent circuit model," Proc.
Inst. Elec. Eng., pt. B, vol. 130, no. 1, 1983.
[16] J. Faiz, H. Jafari; "Accurate Modeling of Single-Sided Linear Induction
Motor Considers End Effect and Equivalent Thickness" IEEE Trans.
Magn. vol.36, no.5, pp:3785-3790, Sep 2000.
[17] I. Boldea and S. A. Nasar, Linear Electromagnetic Device. New York:
Taylor & Francis, 2001.
[18] R. M. Pai, I. Boldea, and S. A. Nasar, "A complete equivalent circuit of
a linear induction motor with sheet secondary," IEEE Trans. Magn., vol.
24, pp. 639-654, Jan. 1988.