Abstract
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.
Highlights
Various kinds of linear synchronous motors (LSMs) have been designed for new applications [1]
The LSM has very high air-gap flux density beyond the remanent magnetization of rare earth permanent magnet (PM), which is generated by a special field structure with rare earth PM
We contrive a new field for LSM or SM to obtain the higher air-gap flux density than the remanent magnetization of rare earth PM [3]
Summary
Various kinds of linear synchronous motors (LSMs) have been designed for new applications [1]. In the case of low flux density in air-gap, the efficiency is not good because the large magneto-motive force (mmf) of armature winding is needed to obtain the required thrust and it causes the large ohmic loss in a normal conducting coil. It is often used Halbach array [2] to get a large air-gap flux density by using rare earth permanent magnet (PM), whose value is under about 1T even in the use of most strong PM.
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