Primary Permanent Magnet Linear Motors for Rail Transit

Permanent magnet (PM) linear motor having magnets and armature windings in the primary mover (the so-called primary-PM machines) have attracted more and more attention due to its definite advantages of robust structure, high power density, high efficiency, and low cost in long stator application. In this paper, the structure, operation principle, characteristics, and electromagnetic performance of two kinds of the primary-PM motors in the application of the rail transit will be presented. Also, some experiment results are given to validate the study.