High Efficiency LSM with High Flux Density for Transportation
Nobuo Fujii, Mitsunobu Terata, Takeshi Mizuma
DOI: 10.4236/jtts.2011.14013   PDF    HTML     4,877 Downloads   8,873 Views   Citations


A new linear synchronous motor (LSM) with permanent magnet (PM) is proposed to develop a linear motor for transportation with high efficiency. The LSM has very high air-gap flux density beyond the remanent magnetization of rare earth PM, which is generated by a special field structure with rare earth PM. Two PMs are arranged to form a triangle over each pole to concentrate the flux of PMs. The maximum value of air-gap flux density is limited to the magnetic saturated value in the core of field and armature, respectively, which is about 2T. The configuration is insusceptible to armature reaction because of large equivalent magnetic resistance in the flux path. The characteristics are analyzed using a two-dimensional finite element method (FEM) considering the core material. For high air-gap flux density and small armature reaction, the very high thrust density beyond the conventional maximum value of 100kN/m2 can be obtained. Using normal thrust density with small magneto-motive force (mmf) of armature, this LSM has efficiency and power factor that are as high as or higher than a rotational motor.

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Fujii, N. , Terata, M. and Mizuma, T. (2011) High Efficiency LSM with High Flux Density for Transportation. Journal of Transportation Technologies, 1, 102-106. doi: 10.4236/jtts.2011.14013.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] J. F. Gieras and Z. J. Piech, “Linear Synchronous Motors, Transportation and Automation Systems,” CRC Press, 2000.
[2] K. Halbach, “Design of Permanent Multipole Magnets with Oriented Rare Earth Cobalt Material,” Nuclear Instruments and Methods, Vol. 169, 1980, pp.1-10. doi:10.1016/0029-554X(80)90094-4
[3] N. Fujii, T. Mizuma and M. Terata, “Linear Synchronous Motor with High Flux Density,” IEEJ Transmission, Vol. 131-D, No. 3, 2011, pp. 412-413. doi:10.1541/ieejias.131.412
[4] M. Karita, “High Thrust type HD Linear Motor,” The Japan Society of Mechanical Engineers, Vol. 101, No. 950, 1998, p. 68.
[5] K. Dreimann, “The M-BAHN Maglev Rapid Transit System-Technology, Status, Experience,” International Conference on MAGLEV AND LINEAR DRIVES, Las Vegas, May 1987, pp. 113-118.

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