Optimal design of auxiliary-teeth to solve circulation current reduction of permanent magnet linear synchronous motor

Abstract

A discontinuity of magnetic circuits according to the end effect is generated in the permanent magnet linear synchronous motor (PMLSM). Due to the unbalanced back electro-motive force (EMF) and impedance produced, unbalanced current is generated. The circulating current, which is caused by a decrease in the thrust, is generated by the unbalanced current. The optimal design of auxiliary-teeth at the end of the mover was carried out to solve the unbalance of phase by using design of experiment (DOE), and compared with the basic model through finite element analysis (FEA). As a result, the auxiliary-teeth model compensates for the decrease of thrust caused by the unbalanced phase. Also, this model is proven to reduce the detent force by the vibration and noise of the PMLSM and copper loss caused by the circulating current.

Keywords

permanent magnet linear synchronous motor / auxiliary-teeth / circulation current / end effect / thrust reduction

References

[1] LEE Dong-Yeup, KIM Gyu-Tak, CHOI Jung-Keying. The design for high power density in the slotless type permanent magnet linear synchronous motor [C]// INTERMAG. Nagoya, Japan, 2005: 653–654.

[2] RADWAN T S, RAHMAN M A, OSHEIBA A M, LASHINE A E. Dynamic analysis of a high performance permanent magnet synchronous motor drive [C]// Electrical and Computer Engineering, (Canadian Conference on Vol.2). Calgary, Canada, 1996: 611–614.

[3] SanadaM., MorimotoS., TakedaY.. Interior permanent magnet linear synchronous motor for high performance drives [J]. IEEE Trans Industry Application, 1997, 33(4): 966-972

[4] CHUNG Shi-Uk, KANG Do-Hyun, CHANG Jung-Hwan, KIM Ji-Won, LEE Ji-Young. New configuration of flux reversal linear synchronous motor [C]// International Conference on Electrical Machines and System. Seoul, Korea, 2007: 864–867.

[5] KARITA M. Present status of linear drives for industry applications in Japan [C]// Proc of LDIA01. Nagano, Japan, 2001: 462–467.

[6] ZhuY.-w., LeeS.-G., ChungK.-S., ChoY.-Hyun.. Investigation of auxiliary poles design criteria on reduction of end effect of detent force for PMLSM [J]. IEEE Trans Magnetics, 2009, 45(6): 2863-2866

[7] ChungS.-U., LeeH.-J., HwangS.-Moon.. A novel design of linear synchronous motor using FRM topology [J]. IEEE Trans on Magnetics, 2008, 44(6): 1514-1517

[8] BatarN., HeeS.-Y., MinhT.-P., ShinP.-S., KohC.-Seop.. Shape optimal design of a 9-pole 10-slot PMLSM for detent force reduction using adaptive response surface method [J]. IEEE Trans Magnetics, 2009, 45(10): 4562-4565

[9] YoshidaK., LeeJ., KimY. J.. 3-D FEM field analysis in controlled PMLSM for maglev vehicle [J]. IEEE Trans Magnetics, 1997, 33(2): 2207-2210

[10] EDIHARA D, KIM H J, KAWAMOTOR Y, TORII S, WATADA M. Study of the transport system with PM type LSM [C]// Annual Conference of IEEE Industry Applications Society. Toronto, Canada, 1993: 53–56.

[11] LimK.-c., WooJ.-K., KangG.-H., KimG.-Tak.. Detent force minimization techniques in permanent magnet linear synchronous [J]. IEEE Trans Magnetics, 2002, 38(2): 1157-1160

[12] JulienG., GhislainR., AbdelmounaimT., BarreP.-J., HautierJ.-Paul.. Impact of permanent magnet field on inductance variation of a PMLSM [J]. IEEE Trans Power Electronics and Application, 2007, 10: 1-9

[13] KimS.-I., LeeJ.-Y., KimY.-K., HongJ.-Pyo.. Optimization for reduction of torque ripple in interior permanent magnet motor by using the Taguchi method [J]. IEEE Trans Magnetics, 2005, 41(5): 1796-1799

[14] OmekandaA. M.. Robust torque and torque-per-inertia optimization of a switched reluctance motor using the Taguchi methods [J]. Industry Applications, IEEE Trans, 2006, 42(2): 473-478

[15] YounS., LeeJ., YoonH., KohC.. A new cogging-free permanent-magnet linear motor [J]. IEEE Trans Magnetics, 2008, 44(7): 1785-1790