| These days, the vertical transportation system has been increasingly used in various industrial applications. Compared with the traditional vertical transportation system, the system driven by linear machine has attracted the enthusiasm of researchers from all over the world for its massive merits, e.g. high space occupation rate, high speed, high efficient and no limitation in system height. Among all types of linear machines, the permanent magnet synchronous linear motor (PMLSM) is proved to be the best candidate for vertical transportation system for its high thrust density and excellent driving performance. To reduce the thrust ripple, this paper investigates the optimization methods of PMLSM when it is applied in transportation system.Firstly, based on the Equivalent Magnetizing Current (EMC) method, Energy variation method and Schwarz-Christoffel transform method, the analytical analysis model of surface mounted PMLSM is established and the characteristics of thrust and detent force are obtained. Then, according to the requirement of a vertical transportation system, the design method of the initial parameters of a PMLSM is illustrated in detail. Based on the concluded existing optimization methods, the original PMLSM is then optimized to meet the system requirement.In addition, two commonly used PMLSM armature structures are also compared in terms of driving performance and braking performance in this paper. The result shows that, although the concentrate winding structure has limitation in braking force, it is the more suitable candidate for vertical transportation system in comparison with the double-layer overlapping winding for its excellent driving performance.Finally, this paper also investigates the modular technology of vertical transportation system. The novel proposed segmented structure PMLSM has excellent driving performance and good heat radiation. Moreover, a prototype has been manufactured to verify the feasibility of the modular structure PMLSM. |
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